Polyurethane foam containing a particulate organic solid and a process for the preparation thereof
AssigneeThe Dow Chemical Company
InventorHans de Vos
Life of this patent
Estimating the term…
Abstract
A polyurethane foam containing a particulate organic polymer having a glass transition temperature of less than 0.degree. C. and a process for preparing such foam is described. A preferred type of particulate organic polymer is a styrene/butadiene polymer. The presence of such particles within a flexible polyurethane foam significantly enhances both the comfort aspect and SAG factor performance of the foam.
Claims18
A process for preparing a polyurethane foam by contacting under reaction conditions an organic polyisocyanate with a polyahl, in the of a blowing agent and from about 1 to about 20 weight percent based on total weight of polyisocyanate and polyahl of a particulate organic polymer having a glass transition temperature of less than 0.degree. C., with the proviso that when the polyisocyanate is toluene diisocyanate the polyahl, when a polyether polyol, has a molecular weight of greater than 3000.
A two component polyurethane foam-forming system, for use in the above mentioned process, which comprises:
- a) a polyisocyanate, and
- b) a polyahl composition comprising (i) a polyether polyol or polyester polyol of from about 1000 to about 12000 molecular weight, (ii) from about 1 to about 20 weight percent based on total weight of (a) and (b) of a particulate organic polymer which has a glass transition temperature of less than 0.degree. C., and (iii) water in from about 1 to about 10 parts per 100 parts by total weight of (b),
- with the proviso that when the polyisocyanate is toluene diisocyanate the polyahl, when a polyether polyol, has a molecular weight greater than 3000.
A process for preparing a polyurethane foam by contacting under reaction conditions an organic polyisocyanate with a polyahl in the presence of a water and a particulate organic polymer characterized in that the particulate organic polymer has a glass transition temperature of less than 0.degree. C. and is a styrene/butadiene, polybutadiene, neoprene, isoprene, vinylpyridine/butadiene, acrylonitrile/butadiene or natural rubber, with the proviso that when the polyisocyanate is toluene diisocyanate the polyahl, when a polyether polyol, has a molecular weight of greater than 3000.
A process for preparing a polyurethane foam by contacting under reaction conditions an organic polyisocyanate with a polyahl in the presence of a water and a particulate organic polymer characterized in that:
- a) the particulate organic polymer has a glass transition temperature of less than 0.degree. C.;
- and
- b) the polyisocyanate, present in an amount to provide an isocyanate reaction index of from about 50 to about 125, comprises methylene diphenylisocyanate, a urethane-modified methylene diphenylisocyanate, or a carbodiimide-modified methylene diphenylisocyanate, or mixtures thereof.
Dependencies are inferred from the claim text.