Resin modified elastomers
AssigneeDow Corning Corporation
InventorsMichael Salvatore Ferritto, Tina Marie Leaym, William James Schulz, Jr., Janet Mary Smith
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Abstract
Resin modified elastomers, methods of making them and their uses. The method for making the elastomers comprises reacting in a diluent an ≡SiH functional siloxane; a diene, diyne or ene-yne compound, a resin having the formula (R13SiO1/2)x(SiO4/2)y(R1SiO3/2)z where each R1 is independently a monovalent hydrocarbon group having 1 to 30 carbon atoms or an unsaturated hydrocarbon group having 2 to 30 carbon atoms x is ≧1, y≧0, z≧0 and y+z≧1.
Claims38
A resin modified elastomer comprising:
- (A) a cross-linked siloxane comprising:
- (i) a siloxane polymer,
- (ii) resin functionality having the formula (R3SiO1/2)x(SiO4/2)y(RSiO3/2)z and
- (iii) cross-links, -E-Y-E-, with each end of the cross-link is bonded to a silicon atom,
- wherein,
- each R is independently a divalent hydrocarbon group having 2 to 30 carbon atoms or a monovalent hydrocarbon group having 1 to 30 carbon atoms;
- wherein when R is a divalent hydrocarbon group it is bonded to the resin and to the siloxane polymer or a cross-link;
- each E is a divalent group independently selected from —CH2CH2— or —CH═CH—;
- Y is a divalent group that is a hydrocarbon having from 1 to 30 carbon atoms;
- and
- x is ≧1, y≧0, z≧0 and y+z≧1;
- and
- (B) a diluent.
A method of making a resin modified elastomer, the method comprising reacting, in the presence of a hydrosilylation catalyst,
- (1) an ≡SiH functional siloxane and,
- (2) a diene, diyne or ene-yne compound
- (3) a resin having the formula (R13SiO1/2)x(SiO4/2)y(R1SiO3/2)z where R1 is independently a monovalent hydrocarbon group having 1 to 30 carbon atoms or an unsaturated hydrocarbon group having 2 to 30 carbon atoms, and x is ≧1, y≧0, z≧0 and y+z≧1;
- wherein (1), (2) and (3) are dispersed in a diluent, and there is 0.1 to 100 weight parts of diluent per weight part of (1), (2) and (3).
Dependencies are inferred from the claim text.