Patent ID: 6034171
Filing Date: 2000-03-07
Classification: C08G,C08L,C09J

Abstract:
A moisture curable composition which comprises a product obtained by mixing a polymeric material having not less than two groups which are independently selected from the group consisting of --R"".sub.2 SiOH and --R"".sub.2 SiR'""SiR"".sub.2 (OR.sup.5).sub.3-p, where each R"" represents an alkyl group having from 1 to 6 carbon atoms; R'"" is a divalent hydrocarbon group which may be interrupted by one or more siloxane spacers having up to six silicon atoms, R.sup.5 represents an alkyl or oxyalkl group in which the alkyl groups have up to 6 carbon atoms; and p has the value 0, 1, or 2, an alkoxysilane curative, (a finely divided filler) and catalyst material for catalysing a condensation reaction between the polymeric material and the alkoxysilane curative, the composition further including an adhesion promoter which comprises a silicone-organic copolymer consisting of units (i) according to the general formula R.sub.a SiO.sub.(4-a)/2 and units (ii) according to the general formula R.sub.b R'SiO.sub.(3-b)/2 where each R is independently selected from the group consisting of monovalent hydrocarbon groups having up to 20 carbon atoms, each a is independently selected and has a value from 0 to 3, each b is independently selected and has a value from 0 to 2 and each R' is independently selected and represents an oxyalkylene chain R.sup.6 (C.sub.2 H.sub.4 O).sub.x (C.sub.3 H.sub.6 O).sub.y Z where R.sup.6 represents a hydrocarbon linkage to a silicon atom, each Z is independently selected and is selected from the group consisting of H and carboxylic acid residues, each x is the independently selected and has a value from 0 to 20 and each y is independently selected and has a value from 0 to 20 and x+y has a value from 3 to 40.