Elastomer-forming compositions comprising alkoxylated mq resins and polydiorganosiloxanes

Claim 1

An organosilicon composition which upon curing forms an elastomer comprising (i) 100 parts by weight of a diorganopolysiloxane of which each terminal group has the general formula --Si(Z) 2 Q, wherein each Z denotes an organic group consisting of C, H and optionally O atoms and Q is selected from the group consisting of --OH, --OSi(OR * ) 3 , --R"Si(OR * ) 3 and --R"Si(Z) 2 OSi(Z) 2 R"Si(OR * ) 3 wherein R" is a divalent alkylene group having up to 10 carbon atoms in the chain linking the two silicon atoms together, R * is an alkyl group having up to 8 carbon atoms, said diorganopolysiloxane having a viscosity of from 10 -4 m 2 /s to 10 m 2 /s, (ii) 1 to 150 parts by weight of an MQ resin consisting essentially of tetravelent units of the general formula SiO 4/2 and monovalent units of the general formula R a R' 3-a SiO 1/2 wherein R is selected from the group consisting of alkyl and aryl groups having from 1 to 8 carbon atoms, R' is a group of the general formula --R"Si(OR * ) 3 wherein R" and R * are as defined above and a has the value of 2 or 3, there being at least one R' group per molecule and (iii) a titanium catalyst.