Low-specific-gravity liquid silicone rubber composition and...

C - Chemistry – Metallurgy – 08 – K

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Details

C08K 7/22 (2006.01) C08J 9/00 (2006.01) C08J 9/02 (2006.01) C08J 9/12 (2006.01) C08J 9/32 (2006.01) C08K 3/36 (2006.01) C08L 83/04 (2006.01)

Patent

CA 2458817

The invention provides a low-specific-gravity silicone rubber composition which possesses excellent dimensional stability during moulding as well as during heating and cooling after curing. The silicone rubber composition comprises a diorganopolysiloxane having a viscosity of from 100 to 100,000 mPa.bullet.s which preferably comprises at least two alkenyl groups per molecule, a hydrophobic reinforcement silica filler; a curing agent in an amount sufficient to cure the composition, hollow resin particles consisting of external shells made of a non-silicone thermoplastic resin, and gaseous or volatile-liquid cores; and water. It is preferred that the curing agent is an addition cure agent.

L'invention concerne une composition de caoutchouc de silicone présentant une gravité spécifique basse et possédant une stabilité dimensionnelle excellente au moulage, ainsi que pendant le réchauffement et le refroidissement après durcissement. Cette composition contient un diorganopolysiloxane, dont la viscosité est située entre 100 et 100000 mPa.s, comprenant au moins, de préférence, deux groupes alkényle par molécule, une charge de renforcement hydrophobe à base de silice, un agent durcissant en quantité suffisante pour durcir la composition, des particules de résine creuses constituées par des coques extérieures en résine thermoplastique autre que silicone et par des noyaux liquides volatils ou gazeux, et de l'eau. Dans un mode de réalisation préféré, l'agent durcissant consiste en un agent durcissant d'apport.

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