Back to results
US 2021/0230423 A1Published application
Polyurethane-polyorganosiloxane copolymer and method for its preparation
AssigneeDow Silicones Corporation
InventorsBizhong Zhu, Martin Grasmann, Vinita Pandit
Life of this patent
Estimating the term…
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.
Claims20
A polyurethane—polyorganosiloxane copolymer comprising units of formulae:
- where
- each RU is independently a monovalent unsaturated hydrocarbon group;
- each RD is independently a divalent hydrocarbon group a divalent halogenated hydrocarbon group;
- each RM is independently a monovalent hydrocarbon group or a monovalent halogenated hydrocarbon group;
- each RP is divalent, trivalent, or tetravalent hydrocarbon group or divalent, trivalent, or tetravalent halogenated hydrocarbon group;
- each RT is independently hydrogen or a hydrocarbon group;
- each subscript b is 0 to 1,000,000;
- subscript c is 0 to 200,000, subscript i is 0 to 200,000, subscript w1 is 0 to 200,000, subscript w2 is 0 to 200,000, subscript w3 is 0 to 200,000, subscript w4 is 0 to 200,000, and a quantity (c+i+w1+w2+w3+w4) is 1;
- subscript d is 0 to 1,000,000;
- subscript e is 0 to 1,000,000;
- subscript f is 1 to 1,500,000;
- subscript g is 0 to 500,000, subscript k is to 500,000, and a quantity (g+k) is 1;
- subscript h is ≥0;
- subscript j is ≥0;
- each X is independently nitrogen, oxygen, or sulfur;
- subscript l=0 or 1 when X is nitrogen, and subscript l=1 when X is oxygen or sulfur;
- subscript m=1 when X is nitrogen and subscript l=1, and subscript m=0 when X is oxygen or sulfur;
- subscript o=0 when X is oxygen or sulfur, and subscript o=1 when X is nitrogen;
- subscript q is greater than 1 and less than or equal to 3;
- subscript s is 0 to 200,000;
- subscript v is 0 to 200,000;
- subscript y1 is 0 to 1,000,000;
- and
- subscript y2≥0.
21 more elements
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 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.
7 more elements
Dependencies are inferred from the claim text.