Patent ID: 9051445
Filing Date: 2015-06-09
Classification: C08G,C08J,C08L

Abstract:
1. A method of producing a silicone rubber sponge, the method comprising: (1a) providing the following components (A)-(F): (A) 100 mass parts of an alkenyl-containing polydiorganosiloxane comprising (B) an organopolysiloxane that has at least two silicon-bonded hydrogen atoms in each molecule, in an amount that provides 0.4 to 20 moles silicon-bonded hydrogen atoms in component (B) per 1 mole of the alkenyl groups in component (A); (C) 10 to 250 mass parts of a mixture comprising water and an inorganic thickener; (D) 0.1 to 15 mass parts of an emulsifying agent; (E) a hydrosilylation reaction catalyst in an amount sufficient to bring about crosslinking of this composition; and (F) 0.001 to 5 mass parts of a cure retarder; (1b) mixing at least two of the components (A)-(F) to form a first separately stored composition, wherein: (1c) subsequently mixing the remainder of components (A)-(F) not included in step (1b) with the first separately stored composition of step (1b) to produce a sponge-forming liquid silicone rubber composition; (2) crosslinking and curing the sponge-forming liquid silicone rubber composition obtained in step (1c) to obtain a water-containing silicone rubber molding; and (3) removing the water from the water-containing silicone rubber molding obtained in step (2) to obtain the silicone rubber sponge.