CN100455623C - 硫化氟橡胶和具有该硫化氟橡胶的热压用缓冲材料 - Google Patents

硫化氟橡胶和具有该硫化氟橡胶的热压用缓冲材料 Download PDF

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CN100455623C
CN100455623C CNB2004800117429A CN200480011742A CN100455623C CN 100455623 C CN100455623 C CN 100455623C CN B2004800117429 A CNB2004800117429 A CN B2004800117429A CN 200480011742 A CN200480011742 A CN 200480011742A CN 100455623 C CN100455623 C CN 100455623C
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Prior art keywords
viton
sulfuration
cushioning material
heat press
layer
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CNB2004800117429A
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CN1780881A (zh
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吉田晃
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Yamauchi Corp
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Yamauchi Corp
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    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
    • H01B3/445—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds from vinylfluorides or other fluoroethylenic compounds
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Abstract

硫化氟橡胶是将由预先配合了适量的硫化剂的原料氟橡胶(A)与没配合硫化剂的原料氟橡胶(B)以8/2-3/7的比例进行混合而成的混合物100质量份、受酸剂1-10质量份以及根据需要所配合的其它的配合剂0-5质量份构成的组合物硫化而成的、上述原料氟橡胶(A)和上述原料氟橡胶(B)各自的数均分子量都为3.5×104-2.0×105的硫化氟橡胶。

Description

硫化氟橡胶和具有该硫化氟橡胶的热压用缓冲材料
技术领域
本发明涉及适用于高温、高压条件且低硬度的硫化氟橡胶，本发明还涉及具有该硫化氟橡胶的热压用缓冲材料。
背景技术
在制造包铜层压板、柔性印刷基板(FPC)、多层层压板等的印刷基板、IC卡、陶瓷层压板、液晶显示板等具有层压结构的精密设备部件(以下称为“层压板”)工序中，为了将对象产品压制成形或热压合，进行热压。
这样的一般热压采用将热压对象物的层压板材料17掺入电热板18之间，施加一定压力和热的方法。为了获得精度良好的层压板，在热压中，必须全面均衡地对层压板材料17施加热和压力。为此，以在电热板18和层压板材料17之间垫有平板状的缓冲材料1的状态，进行热压。
在层压板材料17为FPC或多层板等的表面上存在电路的致密的凹凸时、或者将FPC和多层板成一体而成的挠性多层板等基板自身存在较大的凹凸时，必须使热压用缓冲材料1与层压板材料17的凹凸完全匹配。若热压用缓冲材料1不与层压板材料17的凹凸完全匹配的话，则不可能全面均匀地施加热和压力，其结果会产生压合不紧密，层压板中残留气泡等问题。
以往，作为热压用缓冲材料1，采用了耐热性、耐久性都好的氟橡胶，它被记述在日本特许公开公报200-52369号(特许文献1)中，特别记述了以适应热压对象物的凹凸为目的，采用硬度计的硬度为A60的氟橡胶的热压用缓冲材料。但是，近年来，随着印刷电路精细化的突飞猛进，采用以往的氟橡胶的热压用缓冲材料对凹凸的适应性不够。为此，为了使适应热压对象物的凹凸的适应性更好，人们需要硬度更低的氟橡胶。但是，氟橡胶本身具有很难低硬度化的特性，在氟橡胶中配合多量的软化剂或增塑剂，进行低硬度化的方法中，使用热压时，氟橡胶会产生气体或排污，结果是漏出压制装置和层压板，产生严重问题。因此，必须极力避免软化剂或增塑剂等的低分子材料的使用。
另一方面，防止增塑剂的排污以使氟橡胶低硬度化的方法，即，在氟橡胶组合物中，配合液态的氟橡胶等液态橡胶来代替增塑剂的方法，已在日本特许公开公报平10-158458号(特许文献2)、日本特许公开公报平7-53821号(特许文献3)和日本特许公开公报平6-116464号(特许文献4)成为公知。但是，采用热压用缓冲材料时，使用配合了液态橡胶的氟橡胶时，因预想到高温、高压下的使用最终液态橡胶会排污，所以不理想。
另外，在日本特许公开公报平4-268357号(特许文献5)中公开了硬度A50以下的低硬度氟橡胶硫化组合物。但是，特许文献5中所公开的原料氟橡胶具有极限粘度数和分子量分布等特征，必须通过特殊的合成才能制得，所以很难在市面上购到原料氟橡胶，不容易实施橡胶的成形、加工制造。
这样，就很难提供适用于热压用缓冲材料且硬度计硬度小于A60的硫化氟橡胶。
发明内容
本发明的目的在于提供一种低硬度、且即使在高温、高压下使用，也不产生漏出物，并且容易制得的硫化氟橡胶。
本发明的另一个目的在于提供一种对热压对象物的凹凸的适应性好、且使用时不产生漏出物的热压用缓冲材料。
本发明者尝试不多量配合软化剂或增塑剂等低分子量材料给氟橡胶，通过将氟橡胶的硫化度减小，而将硫化氟橡胶的硬度降低。但是，配合氟橡胶组合物以减小硫化度时，虽可将硫化氟橡胶的硬度降低，但是该硫化氟橡胶暴露在高温、高压的条件时，产生漏出物。对该漏出物进行分析后发现氟橡胶成分渗出。进一步继续研究的结果发现：通过采用数均分子量较大的氟橡胶，并且配合氟橡胶组合物以减小硫化度，可达到本发明的目的。
本发明的硫化氟橡胶，其特征在于，它是将由预先配合了适量的硫化剂的原料氟橡胶(A)与没配合硫化剂的原料氟橡胶(B)以8/2-3/7的比例进行混合而成的混合物100质量份、受酸剂1-10质量份以及根据需要所配合的其它的配合剂0-5质量份构成的组合物硫化而成的、上述原料氟橡胶(A)和上述原料氟橡胶(B)各自的数均分子量都为3.5×104-2.0×105的硫化氟橡胶。
将预先配合硫化剂的原料氟橡胶(A)和没有配合硫化剂的原料氟橡胶(B)，以(A)/(B)＝8/2-3/7的比例进行混合是因为要进行将硫化度减小的配合、若(A)/(B)超过8/2时，很难获得低硬度的硫化氟橡胶，即本发明的目的。另一方面，若(A)/(B)的混合比例小于3/7时，硫化橡胶的强度减弱，压缩永久变形增大，其结果是耐久性差。(A)/(B)更好的混合比例是7/3-3/7。
对于氟橡胶的种类无特别限制，热压使用时，压缩永久变形特性好的1，1-二氟乙烯(VDF)二元共聚物较好。对于氟橡胶的硫化类，较好用压缩永久变形特性好的、高温下的物性变化少的多元醇硫化类的氟橡胶。
是1，1-二氟乙烯二元共聚物的、多元醇硫化类的原料氟橡胶，市面上所出售的“ダィェル”(大金(ダィキン)工业(株式会社))、“Viton”(デュポン公司)、“Fluorel”(3M公司)、“Technoflon”(Ausinont公司)等。
这些市面上的原料氟橡胶有预先混合有最适量的硫化剂的橡胶、和没有混合有硫化剂的橡胶。因此，作为渗入硫化剂的原料氟橡胶和没含有硫化剂的原料氟橡胶，都可用市面上出售的物质，通过将这些原料氟橡胶进行混合，将硫化剂的配合比例小于通常的配合比例，形成硫化度小的硫化氟橡胶。
本发明的氟橡胶组合物，由于进行减小硫化度的配合，并且极力将填充剂等提高硫化氟橡胶的硬度的配合剂减少，所以可制得低硬度的硫化氟橡胶。
另一方面，在硫化度小的硫化氟橡胶中存在未硫化的氟橡胶成分，但是由于在本发明中使用数均分子量较大的氟橡胶，所以即使在高温、高压的条件下使用，也可防止漏出物的发生。
在本发明中，将原料氟橡胶的数均分子量定在3.5×104以上的理由是在采用数均分子量小于上述数值的氟橡胶时，在高温、高压的条件下使用硫化氟橡胶时，未硫化的氟橡胶成分可能会漏出。另一方面，若数均分子量超过2.0×105的话，硫化前的橡胶的粘度增高，存在加工性差的问题。
从另外的观点看，本发明的硫化氟橡胶具有如下的特征：它是将由相对于数均分子量为3.5×104-2.0×105的原料氟橡胶与硫化剂总量100质量份，受酸剂1-10质量份以及根据需要所配合的其它的配合剂0-5质量份构成的组合物硫化而成的、硫化度，以凝胶分率表示为90.0％-98.8％的硫化氟橡胶。
此时也由于极力减少填充剂等提高硫化氟橡胶的硬度的配合剂，并且减小硫化度，所以可制得低硬度的硫化氟橡胶。由于使用数均分子量较大的氟橡胶，所以即使在高温、高压的条件下使用，也不会产生漏出物。
硫化度的调节如下所述进行。即，通过将掺入硫化剂的原料氟橡胶和不含硫化剂的原料氟橡胶进行混合，变化它们的混合比例，可将硫化时的硫化度调整到以凝胶分率表示的90.0％-98.8％。另外，不用掺入硫化剂的原料氟橡胶，而通过配合少于通常量的硫化剂到不含硫化剂的原料氟橡胶中，也可将硫化度调整到以凝胶分率表示的90.0％-98.8％。
在将硫化剂配合到不含硫化剂的原料氟橡胶中的情况时，作为硫化剂可用双酚等公知的物质，较好合用铵盐和鏻盐等硫化促进剂。若硫化氟橡胶的凝胶分率未满90.0％的话，橡胶的强度减弱，压缩永久变形增大，其结果是耐久性变差。另一方面，若凝胶分率超过98.8％时，很难获得本发明的目的的低硬度的硫化氟橡胶。凝胶分率的下限值更好为95.0％，上限值更好为98.7％。在本发明中，凝胶分率是将甲基乙基甲酮作为溶剂进行萃取后所残存的凝胶分率。
在本发明的氟橡胶组合物中，除了氟橡胶和硫化剂以外，作为必需成分，可配合受酸剂。受酸剂是为了中和对原料氟橡胶进行硫化过程中所产生的氟化氢所需要的成分。作为受酸剂，可用通常所用的金属氧化物或盐类，更具体地说可用氧化镁、氧化钙、氢氧化镁、氢氧化钙、氧化铅、二碱基性磷酸铅等。受酸剂的配合量，相对于氟橡胶和硫化剂的总量的100质量份，为1-10质量份。若受酸剂的配合量超过10质量份的话，很难达到硫化氟橡胶的低硬度化。受酸剂的配合量相对于100质量份的氟橡胶和硫化剂的总量，更好为1-5质量份。
作为其它的任意成分，可在总计为0-5质量份的范围内选择性适当配合填充剂、增塑剂、着色剂等。这些任意成分，也有全部都不配合的情况。这些任意成分，由于会阻碍硫化氟橡胶的低硬度化，或者成为使用硫化氟橡胶时产生气体或漏出物的原因，所以在本发明中，必须将其合计量控制在5质量份。任意成分的配合量的合计更好为0-3质量份，最好为0-1.5质量份。
配合增塑剂时，为了防止使用硫化氟橡胶时该增塑剂引起气体或漏出物的产生，较好以增塑剂沸点以上的温度二次硫化氟橡胶硫化，使增塑剂挥发。从该观点看，作为增塑剂，较好选择较低沸点的物质，更具体地说，较好选择沸点在250℃以下的物质。二次硫化较好在200℃-260℃的温度下进行。二次硫化通常是为了提高硫化橡胶的物性而进行的，通过将增塑剂的种类和二次硫化温度按照上述进行设定，除了获得通常二次硫化的效果，还可获得防止使用中增塑剂溢出的效果。
本发明的硫化氟橡胶的硬度计的硬度较好为A40-A55。若硫化氟橡胶的硬度计的硬度小于A40，很难维持橡胶的强度、压缩永久变形的特性、耐久性等物性。另一方面，若硫化氟橡胶的硬度计的硬度超过A55时，不能达到本发明的目的，即不能达到硫化氟橡胶的低硬度化，不能形成对热压对象物的凹凸的适应性好的热压用缓冲材料。硫化氟橡胶的硬度计的硬度的上限值较好为A54，硫化氟橡胶的硬度计的硬度的下限值较好为A45。
本发明的硫化氟橡胶的高温、高压的条件下的压缩永久变形较好小。具体地说，温度200℃、压缩率25％、24小时的条件下的压缩永久变形较好在30％以下。若压缩永久变形过大，使用硫化氟橡胶作为热压用缓冲材料时，热压后，电路等的凹凸会复制在硫化氟橡胶上，在下面的热压中不能进行热和压力的均一化，严重影响热压对象物的产品品质。另外，还因热压时的压力，硫化氟橡胶在面方向上延伸，橡胶可能会被扭断。
本发明的热压用缓冲材料，其特征在于，具有上述的硫化氟橡胶。这样构成的热压用缓冲材料，对热压对象物的凹凸的适应性好，并且可防止使用时漏出物的产生。
热压用缓冲材料可通过将氟橡胶组合物成形为片状，硫化制得。热压用缓冲材料除了可使用硫化氟橡胶片单体以外，还可与其它的部件组合使用。
从耐久性和尺寸稳定性的观点看，与只采用硫化氟橡胶片单体相比，热压用缓冲材料较好形成将硫化氟橡胶层和增强层层压成一体的结构。将硫化氟橡胶片和增强层层压成一体的情况，包括在硫化氟橡胶片中埋设增强材料的情况，和在硫化氟橡胶层的表面层压增强层的情况。作为增强材料，适合用玻璃、聚酰胺、芳香族聚酰胺等耐热性纤维的织布或金属板。
将硫化氟橡胶片和其它的部件复合构成热压用缓冲材料时，也可形成如下结构：1层以上的硫化氟橡胶层，与由选自织布、无纺布、纸、薄膜、箔、片和板中的1种以上构成的1层以上层压成一体。
从使对热压对象物的凹凸的适应性提高的观点出发，热压用缓冲材料较好以本发明的硫化氟橡胶片构成至少一表面。
在不损害硫化氟橡胶的表面特性的范围内，还可以对硫化氟橡胶片的表面进行脱模性处理，形成热压用缓冲材料的表面。作为脱模性处理，列举有合成树脂薄膜的粘贴、合成树脂的涂布、橡胶表面的粗面化处理、紫外线或电子束的照射等。以粘贴合成树脂薄膜作为脱模性处理时，从不损害硫化氟橡胶的表面特性的观点出发，合成树脂薄膜的厚度较好为10μm-100μm。
在本发明的热压用缓冲材料中，硫化氟橡胶片或硫化氟橡胶层的厚度较好为0.1mm-5.0mm。若硫化氟橡胶片或硫化氟橡胶层的厚度薄于0.1mm时，对热压对象物的层压板的凹凸的适应性不够，其结果是严重影响层压板的品质。另外若硫化氟橡胶片或硫化氟橡胶层的厚度超过5.0mm时，热压用缓冲材料的尺寸稳定性和耐久性低，并且热压用缓冲材料的隔热性过大，不能给予热压对象物足够的热，对层压板的品质产生严重影响。
附图说明
图1(a)-(1)是显示本发明的热压用缓冲材料的具体的构成例的截面图。
图2是显示本发明的实施例和比较例的热压用缓冲材料的构成的截面图。
图3是用于热压用缓冲材料的性能评价中的热压装置的示意图。
图4是热压的示意图。
具体实施方式
以下对本发明的实施方式进行说明。
图1(a)-(1)是显示本发明的热压用缓冲材料1的具体的构成例的截面图。
图1(a)所示的热压用缓冲材料1a由成形为片状的硫化氟橡胶2单体构成。
图1(b)所示的热压用缓冲材料1b是通过对硫化氟橡胶层2的表面进行脱模性处理与氟树脂薄膜3接合而成。在硫化氟橡胶2和氟树脂薄膜3之间较好不通过粘合剂，通过硫化氟橡胶2的热压硫化接合。在硫化氟橡胶2和氟树脂薄膜3之间使用接合剂不理想，这是因为接合剂会损害热压用缓冲材料1b表面的橡胶物性，严重影响对热压对象物的凹凸的适应性和热及压力的缓冲性。
图1(c)所示的热压用缓冲材料1c是通过在表里2层的硫化氟橡胶层2的之间夹贴作为增强层的芳香族的聚酰胺织物4，层压成一体而成。
图1(d)所示的热压用缓冲材料1d是通过在表里2层的硫化氟橡胶层2的之间介于作为增强层的芳香族的聚酰胺织物5，再在2层氟橡胶层2的表面上接合氟树脂薄膜3而成。
图1(e)所示的热压用缓冲材料1e是通过在3层硫化氟橡胶层2之间夹贴玻璃织物5，再在表面侧的硫化氟橡胶层2的表面上层压氟树脂薄膜3，在背面侧的硫化氟橡胶层2的表面上层压玻璃织物6，接合成一体而成。玻璃织物6的不接合硫化氟橡胶层2的一侧的表面涂布着用于其赋予脱模性的聚酰亚胺树脂。
图1(f)所示的热压用缓冲材料1f是将芳香族聚酰胺无纺布7与硫化氟橡胶2层压成一体而成。
图1(g)所示的热压用缓冲材料1g是通过在表里2层硫化氟橡胶层2之间夹贴芳香族聚酰胺无纺布层7，再在2层氟橡胶层2的表面层压氟树脂薄膜3进行成一体而成。
图1(h)所示的热压用缓冲材料1h是通过分别在硫化氟橡胶层2的表面侧层压氟树脂薄膜3、在背面侧层压聚酰亚胺薄膜8，进行接合成一体而成。
图1(i)所示的热压用缓冲材料1i是通过分别在硫化氟橡胶层2的表面侧层压氟树脂薄膜3、在背面侧层压玻璃织物9，进行接合成一体而成，玻璃织物9的不接合硫化氟橡胶层2的一侧的表面涂布有为赋予其脱模性的氟树脂。
图1(j)所示的热压用缓冲材料1j是通过分别在硫化氟橡胶层2的表面侧层压氟树脂薄膜3、在背面侧层压玻璃织物9，进行接合成一体而成，玻璃织物9的不接合硫化氟橡胶层2的一侧的表面涂布着为赋予其脱模性的聚酰亚胺树脂。
图1(k)所示的热压用缓冲材料1k是通过将铝板10与硫化氟橡胶2层压成一体而成。
图1(l)所示的热压用缓冲材料11是通过分别在硫化氟橡胶层2的表面侧层压氟树脂薄膜3、在背面侧层压铝板10，进行一体而成。
下面，对采用本发明的热压用缓冲材料1制造层压板的制造方法进行说明。图4显示了制造层压板时的热压的典型例。即，在电热板18和热压对象物的层压板材料17之间介于缓冲材料1的状态下，加热和压力，层压板材料17被热压。热压条件例如为：温度为100℃-250℃，所加压力为0.5MPa-7.0MPa，热压时间为1分钟-120分钟左右。热压后的层压板材料17是不断替换的，但由于缓冲材料1具有耐久性，因此一个缓冲材料通常可持续用于50次-2000次的热压而无需替换使用。
图1的(a)-(1)对采用本发明的硫化氟橡胶的热压用缓冲材料的实施方式进行了说明，本发明的硫化氟橡胶只要用于要求低硬度并且高温、高压的条件下不产生漏出物的用途，也可适用于热压用缓冲材料以外的用途。
(实施例)
为确认本发明的效果，进行以下的比较试验。
(硫化氟橡胶)
利用2个辊对按照表1所示的各种配合而形成的样品1-8的各氟橡胶组合物进行混练，制成各未硫化氟橡胶片，然后，将各未硫化氟橡胶片投入模具内，用热压机进行温度170℃、30分钟的1次硫化。另外，将1次硫化后的各硫化氟橡胶片投入烘箱内，在温度230℃、进行24小时的2次硫化。制得的各硫化氟橡胶片的凝胶分率、硬度计的硬度和压缩永久变形(200℃×24小时×25％)如表1所示。
表1
表2
  (1)   G701   大金工业(株式会社)   PDF-HFP二元共聚物   掺入多元醇硫化剂   数均分子量4.1×10<sup>4</sup>
  (2)   G701BP   大金工业(株式会社)   PDF-HFP二元共聚物   无硫化剂   数均分子量4.1×10<sup>4</sup>
  (3)   G755C   大金工业(株式会社)   PDF-HFP二元共聚物   掺入多元醇硫化剂   数均分子量3.4×10<sup>4</sup>
  (4)   G755CBP   大金工业(株式会社)   PDF-HFP二元共聚物   无硫化剂   数均分子量3.4×10<sup>4</sup>
  (5)   バィロキスマ5301   协和化学工业(株式会社)   低活性MgO
  (6)   ミクロナグ3-150   协和化学工业(株式会社)   高活性MgO
  (7)   CALDIC#2000   近江化学工业(株式会社)   Ca(OH)2
  (8)   Pigmotex701E   山阳色素(株式会社)
  (9)   红氧化铁   户田ビグメント(株式会社)
  (10)   ブレンァクトKR-TTS   味的素ファィンテクノ
  (11)   サンソサィザ-DOA   新日本理化(株式会社)   DOA   沸点215℃
表2显示表1的氟橡胶A(1)-增塑剂(11)的具体例。
凝胶分率如下所述测定。将硫化氟橡胶片裁成约为1mm见方的立方体。取裁断的样品约2克，用甲基乙基甲酮(99％)作为溶剂，用索氏回流器花4小时进行萃取。萃取后使凝胶成分在空气中干燥16小时，再在70℃的恒温槽中放置2天，使溶剂挥发。从萃取前后的重量比率如下所述求出凝胶分率。
凝胶分率(％)＝(萃取后重量/萃取前重量)×100
(热压用缓冲材料)
采用表1所示的各种配合的氟橡胶组合物，按照如下次序制成样品1-8的热压用缓冲材料。各热压用缓冲材料1为如图2所示那样，在表里2层的硫化氟橡胶层2之间介于增强层的玻璃织物5，制成层压成一体的结构。首先，使用2个辊对氟橡胶组合物进行混炼，制成2片厚度0.5mm的未硫化氟橡胶片。然后，在2片未硫化氟橡胶片之间夹入厚度0.2mm的平织玻璃织物并层压，通过以温度180℃、加压力0.98MPa进行热压60分钟，进行氟橡胶的1次硫化，同时将层压物一体化。再在烘箱内进行温度230℃、24小时的2次硫化，制得热压用缓冲材料1。
使用各热压用缓冲材料1，利用如图3所示的方法，将印刷有宽50μm、间隔50μm、厚度50μm的电路11的厚度50μm的基板12，和涂布接合剂在基板12一侧上的厚度25μm的聚酰亚胺制的覆盖膜13热压接合，制成柔性印刷基板。热压是在下部电热板14和上部电热板15之间，插入从下按照基板12、覆盖薄膜13、厚度25μm的氟树脂制脱模薄膜16、热压用缓冲材料1的顺序层压而成的层压物，在温度200℃、加压力4.9MPa、3分钟的条件下进行。热压后，替换热压合了的覆盖薄膜13后的基板12和脱模薄膜16，将在相同条件下的热压重复500次，对热压用缓冲材料1的性能进行了如下的评价。评价结果如表3所示。
表3
  样品1   样品2   样品3  样品4  样品5  样品6  样品7   样品8
  耐久性   好   好   好  好  好  好  好   不可以
  热压性能   好   不可以   不可以  可以  好  好  好   不可以
  漏出性   不可以   好   好  好  好  好  好   不能评价
  综合评价   不可以   不可以   不可以  可以  好  好  好   不可以
耐久性
观察500次热压后的热压用缓冲材料1的状态后发现：样品1-7良好。凝胶分率为88.2％的样品8，热压用缓冲材料有破损。
热压性能
观察基板12和覆盖薄膜13的压附性后发现：样品1、5-7良好。凝胶分率为98.8％的样品4在电路11间的凹部产生了多处空穴，但对于基板12的凹凸来说，若相对小的话，可考虑能够使用。凝胶分率大于98.8％的样品2和3，对基板12的凹凸的适应性不够，多处产生空穴，并且存在因电路11间的凹部造成的没有完全压附的地方。凝胶分率为88.2％的样品8因热压用缓冲材料1破损，所以不能热压合。
漏出性评价
通过电热板15和制得的柔性印刷基板等的漏出状况，对有无气体和漏出进行确认。
样品2-7完全没发现有气体和漏出的产生。氟橡胶的数均分子量为3.4×104的样品1，沿着玻璃织物有氟橡胶成分漏出。凝胶分率为88.2％的样品8，因热压用缓冲材料破损，所以不能测定。
综合评价
通过以上评价，样品5-7可达到本发明的目的。样品4在热压性能和对凹凸的适应性上稍有不足，但是对凹凸较小的基板12的话，还是可以使用的。
参考附图，对本发明的实施方式进行了说明，但是，本发明不限于图示的实施方式。在与本发明相同的范围内，或者与本发明均等的范围内，还可以相对于图示的实施方式进行各种变更。
利用本发明的硫化氟橡胶，通过将形成将硫化度变小的构造；极力减少填充剂等提高硫化氟橡胶硬度的配合剂、软化剂、增塑剂等容易溢出的配合剂；采用数均分子量较大的氟橡胶各种措施相组合，可制得低硬度、且高温、高压条件下使用，也不产生漏出物的硫化氟橡胶。
本发明的热压用缓冲材料通过使用上述硫化氟橡胶使对热压对象物的凹凸的适应性变好，并且可防止使用时漏出物的产生。
工业上利用的可能性
本发明适用于制得高温、高压的条件下使用的硫化氟橡胶和具有这样的氟橡胶的热压用缓冲材料。

Claims (9)

1.硫化氟橡胶，其特征在于，它是将由相对于数均分子量为3.5×104-2.0×105的原料氟橡胶与硫化剂总量100质量份，受酸剂1-10质量份以及其它的配合剂0-5质量份构成的组合物硫化而成的、硫化度以凝胶分率表示为90.0％-98.8％的硫化氟橡胶。
2.根据权利要求1所述的硫化氟橡胶，其特征在于，所述的硫化剂是多元醇硫化剂。
3.根据权利要求1所述的硫化氟橡胶，其特征在于，所述硫化氟橡胶的硬度计的硬度为A40-A55。
4.根据权利要求1所述的硫化氟橡胶，其特征在于，所述的原料氟橡胶是1，1-二氟乙烯二元共聚物。
5.热压用缓冲材料，其特征在于，具有权利要求1所述的硫化氟橡胶。
6.根据权利要求5所述的热压用缓冲材料，其特征在于，将由上述硫化氟橡胶构成的硫化氟橡胶层与增强层层压成一体而成。
7.根据权利要求5所述的热压用缓冲材料，其特征在于，将1层以上的由上述硫化氟橡胶构成的硫化氟橡胶层与1层以上的由选自织布、无纺布、纸、薄膜、箔、片及板中1种以上所构成的层层压成一体而形成。
8.根据权利要求5所述的热压用缓冲材料，其特征在于，至少一表面由上述硫化氟橡胶构成。
9.根据权利要求5所述的热压用缓冲材料，其特征在于，对上述硫化氟橡胶的表面施加脱模性处理。
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