US20070036963A1

US20070036963A1 - Molding material

Info

Publication number: US20070036963A1
Application number: US11/489,311
Authority: US
Inventors: Graham Kemp
Original assignee: Hexcel Composites Ltd
Current assignee: Hexcel Composites Ltd
Priority date: 2005-07-19
Filing date: 2006-07-18
Publication date: 2007-02-15
Also published as: FR2888852A1; DE102006032063A1; ES2289939A1; DE102006032063B4; FR2888852B1; GB0514764D0; GB2462996A; GB2462996B; ITMI20061389A1

Abstract

A B-staged molding material comprises discrete fiber pieces embedded in an epoxy resin matrix. The matrix comprises at least one epoxy resin material and at least one further resin material together with at least one B-staging agent. The matrix further comprises a curing agent and a cure catalyst and/or cure accelerator

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a composite thermoset molding material which finds utility in the formation of molded parts, and in particular complex molded parts.
2. Description of Related Art
Several types of molding materials exist which are intended to be used for the formation of molded parts by way of compression molding. An example of such a system is described in EP 0916477.
A particularly pertinent example is produced by Hexcel Composites Ltd (Duxford, England) and is sold as HexMC®. HexMC® comprises an epoxy resin matrix in combination with chopped carbon fibers and has a high fiber volume fraction (Vf) between 50 to 65% thus enabling it to be used in the manufacture of a wide range of molded structural components. HexMC® is the subject of EP 1134314.
However, molding short fiber systems such as HexMC® successfully relies on the ability of the resin to carry the fiber as it flows in the mold during the curing process. The flow of the material in the mold is clearly dependent on the rheological properties of the resin. Low viscosity epoxy resin matrix molding compounds such as HexMC® are characterized by having relatively high flow properties, which can sometimes lead to unwanted resin/fiber separation. Conversely, very high viscosity material has very low flow and the mold cannot be filled before gelling/curing has occurred.
Current products such as HexMC®/C/2000/R1A have flow characteristics such that the product can be conveniently used without problem for many applications. However, they are not entirely suitable for molding components having complex cross sections. The current solution offered to resolve this problem is to heat HexMC® at 100° C. for 10-20 minutes immediately prior to molding. A degree of advancement reaction takes place in this time leading to an increase in viscosity, thereby facilitating the molding process. This process is known as resin staging or pre-staging. Although this approach does provide a solution, it introduces an extra process step which the customer has to perform. Furthermore, the molding process has to occur reasonably quickly after the resin staging as resin staging considerably diminishes the shelf-life of the product.
In addition, the resins utilized in many high volume fraction moulding systems are manufactured by way of a process requiring solvent removal. Solvent removal increases the cost of manufacture and any solvent residue can affect the quality of the ensuing product. Furthermore, when used to make flat components, HexMC® has been known to blister, particularly towards the edges.
Therefore, it is desirable to produce a resin material which has a viscosity profile comparable to that of the resin staged HexMC®, but where such a viscosity is achieved without the need for high temperature resin staging. It is also desirable to develop a method for the preparation of a resin system which does not require solvents in the production processes.

SUMMARY OF THE INVENTION

According to a first aspect of the present invention there is provided a B-staged molding material comprising discrete fiber pieces embedded in an epoxy resin matrix, said matrix comprising at least one epoxy resin material at least one further resin material, at least one B-staging agent, at least one curing agent and at least one cure catalyst and/or cure accelerator.
According to a second aspect of the present invention there is provided a method for the preparation of a B-staged molding material comprising the steps of:

- a) preparing an epoxy resin matrix by mixing together components including at least one epoxy resin material, at least one further epoxy resin material, at least one B-staging agent, at least one curing agent, and at least one cure catalyst and/or cure accelerator;
- b) coating said resin matrix on to a carrier to form a resin matrix film;
- c) applying said film onto unidirectional fibers so as to form a unidirectional prepreg, dividing said prepreg into smaller discrete pieces and
- d) applying said pieces onto a release paper to form a molding material
  wherein at any one of steps a to d a B-staging process occurs such that controlled advancement of the resin matrix is conducted.

The above described and many other features and attendant advantages of the present invention will become better understood by reference to the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph showing the change in viscosity of the resin matrix of the present invention during B-staging and through its shelf-life at room temperature.
FIG. 2 is a graph showing the change in un-cured Tg of the resin matrix of the present invention with time.
FIG. 3 is a graph showing a comparison of the change in the viscosity of the resin matrix of the present invention (EMC 271-1) and the previous generation resin matrices (EMC 116 and EMC 172).
FIG. 4 is a diagrammatic representation of the cavity part of the spiral flow mold used to measure flow properties of the molding materials.

DETAILED DESCRIPTION OF THE INVENTION

Molding materials, such as those described herein, are often referred to as chopped fiber molding materials. The resin matrix is such that it is preferably prepared by a hot melt process.
The pre-cured molding material is typically referred to as a molding web or sheet.
The first generation of resin matrix suitable for conversion into a high fiber volume chopped molding material is described in EP 1134314. EP 1134314 also discloses suitable material forms and other physical characteristics of HexMC® which apply equally to the invention described herein, for example suitable fiber materials for use with the present invention.
Advantageously, the process of the present invention eliminates the need for solvent usage thereby increasing the efficiency of the manufacturing process. Furthermore, the process of the present invention improves the quality of the product as there are no issues with solvent residue in the product.
All of the resin ingredients are included during the mixing stage. B-staging is a term well known in the art for describing a controlled advancement in the physical state of the resin up to a predetermined level. The extent of B-staging is dependent on the selected B-staging agent and quantity used. Herein B-staging refers to an intermediate stage in the curing reaction of certain thermosetting resin materials in which the material softens when heated and is plastic and fusible but may not entirely dissolve or fuse. A fuller technical description can be found in ‘Principles of Polymerisation’ by George Odian. Therefore, a B-staged material is one wherein the resin is plastic and fusible but not entirely dissolved or fused.
Advantageously, B-staging occurs at room temperature (i.e. 20-25° C.) or slightly elevated temperatures (i.e. up to 30° C.) and over a period of time not exceeding 7 days. Advantageously, the B-staging agent of the present invention is consumed during the B-staging process such that the viscosity of the resin matrix increases and yet the cure facilitating components are unaffected and remain in-situ ready to bring about curing of the resin at the cure temperature.
B-staging may occur in any one of the steps a to d referred to above, for example B-staging can take place within the resin matrix, when it is in the form of the film and/or the prepreg roll and/or the chopped fiber molding material. However, B-staging preferably occurs in the resin matrix prior to commencement of step b. In fact, B-staging typically occurs as soon as the resin mixing process is complete.
Advantageously, B-staging enables the resin matrix to undergo a transition whereby the viscosity of the matrix increases. Therefore, prior to B-staging the resin matrix is sufficiently mobile such that it is easy to mix whilst following B-staging the material has a sufficiently high viscosity such that molding of shapes can readily occur without unwanted separation of the resin matrix and the fibers.
Preferably, the B-staging agent is a reactive primary or aromatic diamine. Suitable B-staging agents include any of the following either alone or in combination isophorone diamine (IPDA), Laromin® C260, Jeffamine® T403, Jeffamine® C230 and Ancamine® 2264. Most preferably, the B-staging agent is IPDA. The B-staging agent may be added to the resin matrix in an amount ranging from 2 to 5% w/w of the total resin composition.
The epoxy resin material of the present invention may be selected from any of the commercially available diglycidylethers of Bisphenol-A either alone or in combination. Typical materials in this class include GY-6010 (Huntsman Advanced Materials, Duxford, UK), Epon 828 (Resolution Performance Products, Pernis, Netherlands) and DER 331 (Dow Chemical, Midland, Mich.). The Bisphenol-A epoxy resin material preferably constitutes from 30 to 50% w/w of the total resin matrix. The epoxy resin material of the present invention is a thermoset material and as such provides a means with which to manipulate further the viscosity and flow characteristics of the molding material.
The further resin material may be a thermosetting resin material and/or a thermoplastic material. The thermosetting resin material of the present invention preferably constitutes 7 to 10% w/w of the total resin matrix. Suitable thermoplastic materials for use with the present invention include any of the following either alone or in combination: phenoxy resins, polyethersulphones, poly(vinylformal) resins, polyamides. Preferably, the thermoplastic material of the present invention is SER 25, a Bisphenol-A epoxy resin modified with 25% phenoxy resin. The thermoplastic material of the present invention preferably constitutes no more than 15% w/w of the total resin matrix.
Suitable curing agents for use with the present invention include any material that will achieve cure at the desired cure cycle and at the desired temperature, in this case 100° C. to 120° C. There are many well-known curing agents that can be used. Suitable curing agents, which may be used alone or in combination, include any of the following: anhydrides; Lewis acids, such as BF₃; aromatic amines such as 3,3-diamino-diphenylsulfone (3,3-DDS), 4,4′-diaminodiphenylsulfone (4,4′-DDS); 4,4′-methylenebis(2-isopropyl-6-methylaniline), e.g., Lonzacure M-MIPA (Lonza Corporation, Fair Lawn, N.J.), 4,4′-methylenebis(2,6-diisopropylaniline), e.g., Lonzacure M-DIPA (Lonza Corp., Fair Lawn, N.J.); aliphatic amines such as dicyandiamide; amino or glycidyl-silanes; CuAcAc/Nonylphenol (1/0.1).
The curing agent preferably constitutes from 5 to 20% w/w of the total resin matrix material. For the avoidance of doubt, by curing agent it is meant a reactive material which, when added to a resin, causes polymerization.
In order to optimize the level of tack of a material of the present invention at least one tackifier may be added to the resin matrix. For the avoidance of doubt, by tackifier it is meant a material that, when added to resin or reinforcement, provides a degree of stickiness or tack to the resin or reinforcement
Tackifiers suitable for use with the present invention include any of the following either alone or in combination; Carboxyl-terminated Butadiene Nitrile (CTBN) rubber modified epoxy resins, Amine-terminated butadiene Nitrile (ATBN) rubber modified epoxy resins and urethane modified epoxy resins. Preferably, the tackifier of the present invention is Hypox® RA95 which is a liquid Bisphenol A epoxy resin modified with 5 to 7% of a butadiene-acrylonitrile rubber. The tackifier may constitute from 5 to 20% w/w of the total resin composition.
The epoxy resin material and the further epoxy resin material may be introduced into the matrix mixture as individual components or as a blend. Where used, the tackifier may also be introduced into the matrix mixture as an individual component or as a blend with the epoxy resin and/or the further epoxy resin material. Advantageously, the inclusion of a tackifier, in particular Hypox® RA95, also serves to further modify the viscosity of the resin.
Suitable accelerators for use with present invention include any of the following either alone or in combination; N,N-dimethyl, N′-3,4-dichlorophenyl urea (Diuron), N,N-dimethyl, N′3-chlorophenyl urea (Monuron), N,N-(4-methyl-m-phenylene bis [N′,N′-dimethylurea] (UR500) and 1,1-dimethyl 3-(3-chloro-4-methylphenyl) urea (Chlortoluron).
The accelerator preferably constitutes from 5-15% w/w of the total resin matrix material. For the avoidance of doubt, by accelerator it is meant a material which, when mixed with a catalyzed resin, will speed up the chemical reaction between the catalysts and the resin. The accelerator is present in small non-stoichiometric amounts that have been empirically determined to give the best properties.
Catalysts suitable for use with the present invention include any of the following imidazoles either alone or in combination: 2-methylimidazole (Curezol 2MZ), 2-ethylimidazole (Curimid 2EI), 2-phenylimidazole (Curezol 2PZ), 2,4-diamino-6-(2-(2-methyl-1-imidazolyl)ethyl)-1,3,5-triazine (Curezol 2MZ-Amine-S), 2-benzyl-4-methylimidazole (Curimid 2B4MI).
The catalyst preferably constitutes <1% w/w of the total resin matrix material. For the avoidance of doubt, by catalyst it is meant a substance which markedly speeds up the cure of a compound when added in minor quantity as compared to the amounts of primary reactants.
In addition, it has been found that the use of a B-staging agent provides a polymeric backbone structure that delivers other advantages to the product web. For example, the resin matrix of the present invention offers improved melt flow and a higher Tg without the need for resin staging.
Therefore, the resin matrix of the present invention may have an isothermal viscosity in the range 2.0-20.0 Pas at 120° C. when measured using a Brookfield cone and plate viscometer. Such a viscometer is well known to those skilled in the art and as such it is not necessary to provide details of how to use such a viscometer. Preferably, the viscosity of the resin matrix is in the range from 2.0-17.0 Pas at 120° C. and most preferably is in the range from 2.5 to 5.0 Pas at 120° C.
Not only does the resin matrix of the molding material of the present invention have an increased viscosity, but it also has a higher cured laminate glass transition temperature (Tg) than existing high fiber volume fraction epoxy matrix chopped fiber molding systems. Therefore, the product web which comprises the resin matrix has a broader applicability such as providing cured products with higher service temperatures. Thus, the resin matrix of the present invention has a cured Tg (E) of at least 115° C.
The present invention has also been found to give rise to molding materials, which once molded and cured, have a gloss aspect greater than existing HexMC® type molding systems. Therefore, the resin matrix of the present invention may have a gloss aspect greater than 45. This gloss aspect improvement was quantified from measurements obtained using a Tri-GLOSS master instrument, which is available from Sheen Instruments Ltd, Kingston upon Thames, England.
The samples for the gloss aspect test were laminates prepared from 3 plies of HexMC® web that were press cured at 80 bar for 15 minutes at 120° C. The resulting laminates were 3.5 mm thick. Laminate preparation is described in further detail in the product data sheets for HexMC® Molding Compounds available from Hexcel Composites Ltd., Duxford, England. For comparison purposes, laminates from the current invention were compared with those from the C/2000/R1A material. The C/2000/R1A material had a reading of 42 units while the inventive material had a reading of 49 units. In both cases the quoted results were the average of six determinations.
An indication of the flow of chopped fiber type molding materials can be obtained using several techniques one of which is a spiral flow test. This test is well known in the injection molding and sheet molding industries and is a method for determining the flow properties of a polymeric material based on the distance it will flow, under controlled conditions of temperature and pressure, along a special runner or flow channel of constant cross section. The test is performed in a molding press using a mold into which the material is fed at the center of a spiral cavity. This is described in further detail in ASTM Standard D3133-98 (2004).
The spiral flow mold used to measure material flow herein was a steel matching punch-cavity compression mold. The cavity part on the mold is shown in FIG. 4 and has, as the critical dimensions, a central cavity of 152.4 mm diameter and a flow channel having a width of 38.1 mm. and two radii of 101.6 mm. The length of the flow channel was sufficient to accommodate 710 mm of flow. A molding material charge weight of 160 gm. was made from 90 mm×90 mm. squares of sheet material, heated to 135±3° C., placed in the central cavity and held for about a 45 second dwell time. The flow tool mold was then closed and a pressure of 36,000 Newtons applied for about 10 minutes. The mold was cooled, the part removed and the flow length measured. The flow length measurement is taken at the point at the end of the flow path where the cured material begins to taper from full width into a tail.
The B-staged material (without resin staging) of the present invention was found to have a flow length of 312 mm compared to a flow length of 274 mm for the existing heat staged Hex MC® C/2000/R1A product.
Further minor ingredients may be included as performance enhancing or modifying agents in the matrix resin composition, such as any of the following: core shell rubbers; flame retardants; wetting agents; diluents; pigments/dyes; UV stabilizers; anti-fungal compounds; fillers and toughening particles.

The present invention will now be described further with reference to the following formulary example and experimental data:

EXAMPLE 1


(EMC 271-1)

			Amount
Ingredient	Function	Source	(% w/w)

LY 1556	Epoxy Resin	Huntsman	41
DEN 438	Epoxy Resin	Dow	8.5
HyPox RA 95	Tackifier	CVC Speciality	15.0
		Chemicals
SER
25	Thermoplastic Resin	InChem Corp	10.0
PAT 656/3	Release Agent	Chemical Release	2.0
		Company
HY 1571	Curing Agent	Huntsman	8.0
HY1524	Accelerator	Huntsman	10.4
Curezol 2MZ	Catalyst	Air Products	0.6
Azine S
IPDA	B-staging agent	BASF	4.5

The location of the sources for the above-listed ingredients are as follows: Huntsman Advanced Materials, Duxford, England; Dow resin is available from Univar Ltd, Cheadle, England; CVC Speciality Chemicals, Moorestown, N.J.; InChem Corp, Rock Hill, S.C.; Chemical Release Company, Harrogate, North Yorkshire, England; Air Products, Manchester, England; and BASF, Cheadle, England.
The present invention was born out of a need to increase the viscosity of the matrix resin of a molding compound, said molding compound comprising a matrix resin having fiber pieces embedded therein. The modification was required to further guarantee that during cure, the resin matrix and fiber pieces are not separated. Therefore, the following data is a comparison of the present invention (referred to as EMC 271-1 or 271-1) against the previous generation product HexMC® (referred to as EMC 116 or 116). EMC 116 has been commercialized as HexMC®/C/2000/R1A.

EMC 271-1 differs from EMC 116 in that EMC 271-1 comprises IPDA combined with selected resins to give the desired viscosity. EMC 116 does not contain IPDA. Table 1 shows the flow test results for EMC 271-1 as compared with EMC 116, both resin systems being without resin staging immediately prior to molding.

	TABLE 1


	Cookie Test Results

	Batch	B-stage	Thickness	Diameter	Resin: Fibre	Surface
Product	No.	process	(mm)	(cm)	Separation	Aspect

271-1	1065	Prepreg	4.5	18	None	No
						Blisters
271-1	1091	Resin	4.5	19	None	No
						Blisters
116	—	None	6.8	15	Some	Blisters
					separation
					around the
					edge

All results are from product web using Fortafil® standard modulus 24,000 filament F503 carbon fiber.
The results shown in Table 1 were obtained using the so-called “cookie test”. The cookie test involves pressing a mass (ca. 220 g) of chopped fiber molding material into a flat circular/oval shape and measuring the thickness and diameter of the resulting cookie. The thinner and wider the cookie is, the better the results provided that the resin stays with the fiber at these dimensions. Therefore, any resin matrix/fiber separation is also noted. The mass for pressing is made from 10 plies of 100 sq. cm. discs of molding material that are placed on top of each other, weighed and the weight adjusted to 220 g by adding or removing some material. The specimen is then pressed for 10 minutes at 135° C. under 50 kN pressure.
Two B-staging options were investigated. One involved B-staging the 271-1 resin matrix prior to film formation, the other involved B-staging the prepreg prior to it being chopped into molding compound flakes. It can be seen that irrespective of whether the B-staging process is conducted on the resin or the prepreg, there is little difference between the physical properties of cookie obtained. In any event, the test results show that the flow performance of EMC 271-1 is a significant improvement over that of EMC 116.

Table 2 shows the spiral flow test results for EMC 271-1 and EMC 116 with two types of standard modulus carbon fibre. One is 12,000 filament AS4 from Hexcel Corporation, Salt Lake City, Utah, USA and the other is 24,000 filament F503 from Toho Carbon Fibres Fortafil®, Rockwood, Tenn., USA.

TABLE 2


			Flow
	Fibre		Length	Surface
Set	Type	Resin Type	(mm)	Quality	Thermal Staging

1	F503	EMC 271-1	312	Good	No resin staging
1	F503	EMC	116	274	Good	13 min. @ 100° C.
1	AS4	EMC 271-1	206	Bad	No resin staging
1	AS4	EMC	116	127	Bad	13 min. @ 100° C.
2	F503	EMC 271-1	345	Good	No resin staging
2	F503	EMC	116	351	Good	13 min. @ 100° C.
2	AS4	EMC 271-1	241	Good	No resin staging
2	AS4	EMC	116	127	Bad	13 min. @ 100° C.

The spiral flow tests in Set 1 were carried out with a 160 gram material charge having a 45 second dwell in the mould before closing the press and maintaining a temperature of 135° C. for 10 minutes under a ram pressure of 40 tons. Set 2 tests were similar except that the dwell time was 90 seconds.
The spiral flow test results show that although the nature of the fiber type does affect the flow of the resin matrix, EMC 271-1 without resin staging, has, with one exception, better flow than resin staged EMC 116, all other parameters being equal.

Table 3 shows the mechanical test results and glass transition temperature (Tg−E) of cured laminates molded from EMC 271-1 and EMC 116. The batches used and the B-stage process are identical to those from Table 1. Dynamic mechanical thermal analysis (DMTA) was used to determine the Tg storage modulus (E) of cured samples. The value was determined from the onset of loss of the elastic modulus over the temperature range 50° C. to 300° C. using a 5° C. per minute ramp rate at a frequency of 1 Hz and a strain level of ×4 (peak to peak displacement of 64 microns). The equipment used was a Universal V3.9 analyzer from TA Instruments.

TABLE 3


								Inter-
								Laminar
				Flexural	Flexural	Tensile	Tensile	Shear
	Batch	B-stage	Tg-E	Strength	Modulus	Strength	Modulus	Strength
Product	Number.	Process	(° C.)	(Mpa)	(Gpa)	(Mpa)	(Gpa)	(Mpa)

271-1	1065	Prepreg	120	440	36.1	288.8	47.8	49.2
271-1	1091	Resin	125	450	33.5	276.2	35.7	53.7
116	—	None	100	450	40	280	45	45

All results are for a molding web produced with Fortafil® F503-24K carbon fiber.
The mechanical properties of EMC 271-1 are generally in line with those for EMC 116 with the significant benefit of a 20-25° C. increase in Tg. Clearly this broadens the applications for which the product can be used.
The B-staging reaction is essentially completed in 3 to 4 days. In this period, for each batch of EMC 271-1 the viscosity at 120° C. increases 5 fold from about 0.5 Pas to about 2.5 Pas. This initial increase is followed by a slow increase in viscosity over the next three weeks as is typical with all low temperature curing epoxy resin systems (see FIG. 1). In the same 3 to 4 day period the uncured Tg changes from about −2.5° C. to about 5° C. (see FIG. 2). It can be concluded from FIGS. 1 and 2 that a suitable period to allow for the B-stage process is 3 to 4 days.
It is worthy of note that the B-staging process must occur at temperatures up to 30° C. and preferably at room temperature i.e. from 20 to 25° C. Attempts to accelerate the B-staging process by applying heat results in a less stable product. For example, heating freshly produced EMC 271-1 resin for 4 hours at 60° C. achieves the same hot melt viscosity as that from room temperature ageing over 7 days. However, this system rapidly increases in viscosity with time and is completely unstable.
FIG. 3 shows the average viscosity results from EMC 271-1, as shown in FIG. 1, but comparative data for EMC 116 and an additional system, EMC 172, have been added. EMC 172 is a high viscosity product attained by increasing levels of solid Bisphenol A and phenoxy resins, but no B-staging takes place due to the absence of isophorone diamine. EMC 172 contains the same cure system as EMC 271-1 (curing agent, accelerator and catalyst). In general the viscosity of EMC 271-1 resin after 4 to 5 days is 80 to 85% of the value after 30 days.
The EMC 116 graph appears almost as a straight line, but there is a gentle slope upwards and this is due to the fact that a change occurs towards the middle of the recommended shelf-life when the viscosity increases. Thus, in the example shown in FIG. 3, the viscosity value after 16 days is 85% of the result after 30 days. The same trend is shown by the experimental resin matrix EMC 172. There is a period of reasonable stability for the first half of the 30 days and then there is a more upwards to higher viscosity. In this case the value after 8 days is 82% of the result after 30 days.
FIG. 4 shows a spiral flow compression mold 1 having a central cavity 2 having a radius 4 of 76.2 mm and a flow or runner channel 3 of constant width 5 of 38.1 mm. The mold has a radius 6 of 101.6 mm. In use, the material (non resin staged) under test is placed in the central cavity 2 and held for a 45 second dwell time. The compression mold 1 is then closed and a pressure of 36000 Newtons is applied for about 10 minutes. The mold is cooled, opened and the flow length measured.
Clearly, the flow rate is influenced by the radius 4 of the central cavity 2 and the width 5 of the flow channel 3. All references to spiral flow referred to herein have been determined under the conditions and using a spiral flow compression mold having the dimensions referred to previously in the paragraphs 38 and 39.
It is of course to be understood that the invention is not intended to be restricted to the details of the above embodiments, which are described by way of example only.

Claims

1. A computer program product comprising a computer storage medium storing a computer program code mechanism which when executed by a computer causes the computer to perform a method, comprising:

obtaining M-dimensional parameters relating to a service, the parameters being represented as numeric values; and

generating detailed information representing content of the service by the parameters obtained.

2. The computer program product according to claim 1,

wherein the obtaining step obtains the parameters normalized by base units.

3. The computer program product according to claim 1,

wherein the obtaining step divides the parameters into a plurality of regions based on a main-factor parameter that is most likely to restrict coexistence with the other parameters, and obtains the parameters for each of the regions.

4. The computer program product according to claim 3,

wherein the obtaining step obtains the M-dimensional parameters for each of the regions as one-dimensional integer values, respectively.

5. The computer program product according to claim 4,

wherein the generating step represents the detailed information by a combination of the integer values and logic symbols.

6. The computer program product according to claim 5,

wherein the generating step uses a first symbol representing selection of one of the plurality of integer values and a second symbol representing a set of the integer values.

7. The computer program product according to claim 6,

wherein the generating step uses, as the second symbol, a start value representing a start of a range, an end value representing an end of the range, and a step defining a change width between the start value and the end value.

8. The computer program product according to claim 1,

wherein the service is a service of sending or receiving data via a network.

9. The computer program product according to claim 8, further comprising the steps of:

obtaining an identifier for identifying the service; and

adding the identifier to the detailed information.

10. The computer program product according to claim 9, further comprising:

a first sending step of sending the identifier to a specified destination via the network.

11. The computer program product according to claim 10, further comprising:

a first receiving step of receiving a request for sending the detailed information associated with the identifier from the destination;

a second sending step of sending the detailed information to the destination via the network, based on the request received by the processing in the first receiving step;

a second receiving step of receiving the M-dimensional parameters included in the detailed information sent from the destination; and

a communicating step of communicating with the destination based on the M-dimensional parameters received by the processing in the second receiving step.

12. The computer program product according to claim 9, further comprising:

a first receiving step of receiving the identifier sent via the network.

13. The computer program product according to claim 12, further comprising:

a requesting step of requesting sending of the identification information generated by a sender of the identifier received by the processing in the first receiving step, the identification information being the detailed information associated with the identifier;

a second receiving step of receiving the detailed information sent via the network from the sender of the identifier, based on the request by the processing in the requesting step;

a setting step of comparing the detailed information received by the processing in the second receiving step with the detailed information generated by the processing in the generating step, and setting the M-dimensional parameters that satisfy both of these sets of detailed information;

a sending step of sending the M-dimensional parameters generated by the processing in the setting step to the sender of the identifier; and

a communicating step of communicating with the sender based on the M-dimensional parameters sent by the processing in the sending step.

14. An information processing method for an information processing apparatus, comprising the steps of:

15. An information processing apparatus comprising:

means for obtaining M-dimensional parameters relating to a service, the parameters being represented as numeric values; and

means for generating detailed information representing content of the service by the parameters obtained.

16-19. (canceled)

20. An information processing device for determining capabilities of a second information processing device, said information processing device comprising:

an interface configured obtain M-dimensional parameters relating to a service at the second information processing device, the parameters being represented as numeric values; and

a processor configured to generate detailed information representing content of the service by the parameters obtained.

21. The information processing device of claim 20, wherein the M-dimensional parameters are normalized by base units.

22. The information processing device of claim 20, wherein the service is a service of sending or receiving data via a network.

23. The information processing device of claim 22, wherein

the interface is configured to obtain an identifier for identifying the service; and

the processor is configured to add the identifier to the detailed information.

24. The information processing device of claim 23, wherein the interface is configured to send the identifier to a specified destination via the network.