Patent ID: 6531621
Filing Date: 2003-03-11
Classification: C08G,C09K

Abstract:
A process for preparing alkoxy-terminated organopolysiloxanes, comprising reacting(A) at least one HO-terminated organopolysiloxane (B) at least one alkoxysilane of the general formula (III) R5&mgr;Si(OR6)4âˆ’&mgr;â€ƒâ€ƒ(III), where R5 and R6 are independently monovalent, unsubstituted or fluorine-, chlorine-, bromine-, C1-C4-alkoxyalkyl- or cyano-substituted C1-C13-hydrocarbon radicals, and is 0 or 1, &mgr; is 0 or 1, and/or a partial hydrolysate thereof, in the presence of (C) at least one acid phosphoric ester of the general formula (I) (HO)aOP(â€”Oâ€”[(CR12)bâ€”O]c(CR22)dâ€”Lâ€”M)(3âˆ’a)â€ƒâ€ƒ(I), where a is 1 or 2, R1 and R2 are a hydrogen radical, methyl radical or hydroxyl radical, b and d are 2 or 3, c is an integer from 2 to 15, L is a radical selected from the group consisting of â€”Oâ€”, â€”COOâ€”, â€”OOCâ€”, â€”CONR3â€”, â€”NR4COâ€” and â€”COâ€”, R3 and R4 are independently a hydrogen radical or C1-C10-alkyl radical, and M is a monovalent, unsubstituted or hydroxyl-, fluorine-, chlorine-, bromine-, C1-C10-alkoxyalkyl- or cyano-substituted C1-C20-hydrocarbon radical, with the proviso that on any carbon atom only one radical R1 and R2 may be a hydroxyl radical.