Polymer/polyols, methods for making same and polyurethanes based thereon
AssigneeUnion Carbide Corporation
InventorRussell VanCleve
Life of this patent
Estimating the term…
Abstract
This invention relates to normally liquid, stable polymer/polyol compositions formed by polymerizing, in the presence of a free radical catalyst, an ethylenically unsaturated monomer or monomers dissolved or dispersed in a polyol mixture including a coupled polyol consisting of the reaction product of a polyol having a functionality in excess of 2 reacted with polyisocyanate in such proportion that the ratio of hydroxyl groups to isocyanato groups is greater than 1. In one embodiment, the coupled polyol is made in situ in the base polyol by addition thereto of the required amount of the polyisocyanate. The novel polymer/polyol compositions are convertible to polyurethane foams and elastomers.
Claims41
A normally liquid, stable polymer/polyol composition formed by polymerizing, in the presence of a free radical catalyst, (1) from about 10 to about 50 weight percent of a mixture of acrylonitrile and an ethylenically unsaturated comonomer or comonomers in a weight ratio, respectively, of from about 80:20 to about 20:80, dissolved or dispersed in (2) from about 50 to about 90 weight percent of a polyol mixture comprising (a) a base polyol having a number average molecular weight of at least about 500 and (b) a coupled polyol consisting essentially of the reaction product of a polyol having a functionality in excess of 2 reacted with a polyisocyanate in such proportion that the ratio of hydroxyl groups to isocyanato groups is greater than 1, the coupled polyol being present in an amount sufficient to stabilize the resulting polymer/polyol.
A process for producing a normally liquid, stable polymer/polyol composition which comprises:
- (a) providing a polyol mixture comprising (1) a base polyol having a number average molecular weight of at least about 500 and (2) a coupled polyol consisting essentially of the reaction product of a polyol having a functionality in excess of 2 reacted with a polyisocyanate in such proportion that the ratio of hydroxyl groups to isocyanato groups is greater than 1, (b) dissolving or dispersing from about 10 to about 50 weight percent of a mixture of acrylonitrile and a comonomer or comonomers in a weight ratio, respectively, of from about 80:20 to about 20:80 in from about 50 to about 90 weight percent of said polyol mixture, and (c) polymerizing the mixture of acrylonitrile and styrene dissolved or dispersed in said polyol mixture in the presence of a free radical catalyst, said coupled polyol being present in an amount sufficient to stabilize the resulting polymer/polyol.
Dependencies are inferred from the claim text.