B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
117/143
B32B 13/12 (2006.01) B05D 7/24 (2006.01) B05D 7/26 (2006.01) C04B 41/49 (2006.01) C09D 143/04 (2006.01) C09D 183/06 (2006.01)
Patent
CA 1092450
ABSTRACT OF THE DISCLOSURE A method is provided for bonding a room temperature vulcanizable organopolysiloxane composition to a porous non-metallic, i.e., masonry, substrate in which the bonded composite will be in contact with water. The method comprises: applying, to the masonry substrate, a solution con- sisting essentially of a product obtained from the reaction of an acrylate and an acryloxyalkylalkoxysilane in the presence of a free radical initiator and an organic solvent; evaporating off the solvent and there- after applying a room temperature vulcanizable modified organopolysiloxane composition to the dried substrate. The room temperature vulcanizably modified organopolysiloxane composition is obtained from the polymeriza- tion of an organopolysiloxane of the formula Image in which R"" is selected from the class consisting of monovalent hydro- carbon radicals, halogenated monovalent hydrocarbon radicals having from 1 to 18 carbon atoms and a cyanoalkyl radical and x is a number of from 0 to 20,000, with a polymerizable organic monomer having aliphatic unsatura- tion in the presence of a free radical initiator, and thereafter adding a cross-linking agent to the modified organopolysiloxane. As an important part of such method, compositions are provided that may be used as primers for bonding silicone elastomers to porous non-metallic substrates. These primers exhibit good adhesive properties when applied to porous non- metallic substrates which are subject to high humidity or where they are in direct contact with water.
262396
Marcus & Associates
Sws Silicones Corporation
LandOfFree
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