Branched polydimethylsiloxane-polyoxyalkyl copolymers, a method for producing same and its use as anti-fumigation additive in UV-hardened silicons

摘要

Polydimethylsiloxane-polyoxyalkylene copolymer (I), is claimed. Polydimethylsiloxane-polyoxyalkylene copolymer of formula ([A1] a[B1] b[C1] c[D1] d) (I), is claimed. A1 : a silicon containing group of formula (-Si((R) 2)-[O-Si((R) 2)] n-O-Si((R) 2)-) (II); n : 2-498; B1 : a silicon containing group of formula (R1(-Si((R) 2)-O-[-Si((R) 2)-O] a-[-Si(R)(R1)-O] b-[Si((R2) 2)] c-[-Si(R3)(R2)-O] d-Si((R) 2)-R1)) (III); R2 : (-O-[-Si((R) 2)-O] a-[-Si(R)(R1)-O] b-[-Si((R2) 2)] c-[-Si(R3)(R2)-O] d-Si((R) 2)-R1)) (IIIa); C1 : -CH 2-CH 2-Q1-CH 2-CH 2- or -O-Q2-O-; D1 : -CH 2-CH 2-Q1-CH=CH 2or -O-Q2-OH; a : 0-500; b : 0-60; either c, d : 0-10; or c+d : >= 1; R : cyclic aliphatic or aromatic 1-20C hydrocarbon; R1 : a bond or R; R3 : R1 or an optionally saturated organic residue substituted with heteroatoms; Q1 : a bond or organic residue; and Q2 : organic residue. Provided that: at least one R1 is a bond, the average number of T- and Q-units per block B1 is = 20, and the average number of D1 units per block B1 is = 2000; and the molar fractions of A1-D1 and a is 20-70%, preferably 35-50%, the molar fractions of A1-D1 and b is greater than 0-20%, preferably 0.1-10%, the molar fractions of A1-D1 and c is 30 to less than 60%, preferably 30-50% and the molar fractions of A1-D1 and d is greater than 0, preferably 1-15%. Independent claims are included for: (1) the preparation of the copolymer comprising reacting a silicon compound of formula (H-Si(R) 2-[O-Si(R) 2] n-O-Si(R) 2-H) (X), a silicon compound of formula (R6-Si(R) 2-O-[Si(R) 2-O] a-[Si(R)(H)-O] b-[Si(R2a) 2-O] c-[Si(R7)(R2a)-O] d-Si((R) 2)(R6) (XI), and a compound of formula (CH 2=CH-Q1-CH=CH 2) (XII) or (H-O-Q2-O-H) (XIII); (2) a composition comprising the copolymer, (X) and/or (XI); and (3) a silicone release coating comprising 0.001-5 wt.% of the copolymer. R2a : (-O-[-Si((R) 2)-O] a-[-Si(R)(H)-O] b-[-Si((R2a) 2)] c-[-Si(R7)(R2a)-O] d-Si((R) 2)-R6); R6 : H or R; and R7 : H, R or optionally saturated organic residue substituted with heteroatoms. Provided that: when b is 0, one residue R 6>and R 7>is H, the average value of T and Q units per molecule is = 20, the average value of D1 units per molecule is = 2000 and the average value of D1 units per molecule is = 100.