This invention concerns transfer sheets which include a blocking agent and which are useful in the heat transfer dye printing of various materials such as textiles. The blocking agent is capable of chemically reacting with and thereby completely or partially blocking the transfer of heat transfer dyes...http://www.google.fr/patents/US4171202?utm_source=gb-gplus-shareBrevet US4171202 - Sheet containing sublimable dye and blocking reagent for heat transfer printing
Sheet containing sublimable dye and blocking reagent for heat transfer printing
