Electron beam cured silicone materials

摘要

Methods of preparing silicone materials using electron beam curing are described. The materials are hot melt processed and cured in the absence of an effective amount of catalysts and initiators. Both functional and nonfunctionalized silicone materials may be used. Exemplary cured materials include silicone pressure sensitive adhesives, silicone foams, and non-tacky silicon films.

主权项

1. A method of making a crosslinked silicone-based pressure sensitive adhesive, the method comprising:
mixing by extruding a solventless composition comprising a nonfunctionalized silicone polymer and optional components selected from silicate tackifying resins, dyes, pigments, fillers, flame retardants, rheology modifiers, flow agents, surfactants, glass bubbles, and polymeric microspheres; wherein the nonfunctionalized silicone polymer has the following formula: wherein:
R1, R2, R3, and R4 are independently selected from the group consisting of an alkyl group and an aryl group;R5 is an alkyl group;n and m are integers, and at least one of m or n is not zero;optionally wherein one or more alkyl or aryl groups include a halogen substituent;subsequently, coating the composition on a substrate; andsubjecting the coated composition to electron beam irradiation forming the crosslinked silicone-based pressure sensitive adhesive;wherein the composition is substantially free of catalysts and initiators.