Patent ID: 9670337
Date: 2017-06-06
CPC Classifications: C08K,C08L

Claim:
1. A flame-retardant thermoplastic polyurethane composition, comprising, in reacted form: a diisocyanate; a substance reactive toward isocyanate; optionally, a chain extender; optionally, a catalyst; a flame retardant; and optionally, an additive and/or auxiliary, wherein the flame retardant comprises a metal hydroxide at least partially surrounded by a coating, and the metal hydroxide is aluminum hydroxide, wherein the coating comprises an organosilane compound having the following structure: wherein X is a hydrolysable group which reacts with the surface of the metal hydroxide and R is a saturated hydrocarbon moiety having from 8 to 18 carbon atoms, wherein the coating is present in an amount of from 0.5% by weight to 1.5% by weight based on total amount of the metal hydroxide, wherein the metal hydroxide is present in an amount of from 10% to 65% by weight, based on the polyurethane, and wherein a shore A hardness of the thermoplastic polyurethane is lower than 95 A.