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US 11,142,639 B2Granted
Polyurethane-polyorganosiloxane copolymer and method for its preparation
AssigneeDow Silicones Corporation
InventorsBizhong Zhu, Martin Grasmann, Vinita Pandit
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Abstract
A polyurethane-polyorganosiloxane copolymer and methods for its preparation are disclosed. The copolymer has polyfunctional end groups, which render it crosslinkable by multiple crosslinking reactions.
Claims4
A polyurethane-polyorganosiloxane copolymer comprising formula:
- where
- each RU is independently an alkenyl group of 2 to 13 carbon atoms;
- each RD is independently an alkylene group of 2 to 13 carbon atoms;
- each RP is a trivalent hydrocarbon group or a trivalent halogenated hydrocarbon group;
- each subscript b is independently 0 or 1;
- each subscript a is independently 0 to 100,000;
- and
- subscript n is 1 to 10,000
- each subscript y3 is independently 1 to 200,000;
- and
- subscript n1 is 1 to 1,500,000.
8 more elements
Dependencies are inferred from the claim text.