Polyurethanes containing amino organosilane modified clay

Abstract

The instant disclosure is directed to the polyurethane polymer compositions which are filled with a kaolin clay which has been modified with from 1% to 3% of an amino organosilane. The modulus and tear resistance of the polymers is improved without degradation of the remaining properties.

I claim: 
     
       1. A polyurethane polymer composition containing as a filler, modified kaolin clay, said kaolin clay .Iadd.having been .Iaddend.modified .Iadd.by treatment .Iaddend.with from 1% to 3% by weight with an aminoorganosilane of the formula ##STR2## wherein R 1  is selected from the group consisting of hydrogen, alkyl, aryl, cycloalkyl, and alkaryl, R 2  is selected from the group consisting of hydrogen, alkyl, aryl, cycloalkyl, and alkylaryl, R 3  is selected from the group consisting of hydrogen, lower alkyl, aryl, lower alkylaryl, and lower arylalkyl, R 4  is selected from the group consisting of hydrogen, lower alkyl, aryl, lower alkylaryl, and lower arylalkyl, R 5  is selected from the group consisting of hydrogen, lower alkyl, aryl, lower alkylaryl, and lower arylalkyl, and X is selected from the group consisting of alkylene, arylene, alkylarylene, arylalkylene, cycloalkylene, cycloalkylene containing secondary amino nitrogen and cycloalkylene containing tertiary amino nitrogen.Iadd., the modification of said kaolin clay being carried out by spray drying kaolin slurries having one or more of said amonoorganosilanes dispersed therein, said spray drying effecting a uniform distribution of said aminoorganosilane on the kaolin. .Iaddend. 
     
     
       2. The composition of claim 1 wherein the filler is kaolin clay modified with from 1% to 3% by weight of a diamino functional silane. 
     
     
       3. The composition of claim 1 wherein the filler is kaolin clay modified with 1% to 3% by weight of gamma-aminopropyltriethoxysilane. .Iadd. 4. A polyurethane polymer composition containing as a filler, modified kaolin clay, said kaolin clay having been modified by treatment with from 1% to 3% by weight of an aminoorganosilane of the formula:   H.sub.2 N--R--Si--(OR').sub.3     wherein R is selected from the group consisting of phenylene, lower alkyl substituted phenylene, lower alkoxy substituted phenylene, and lower alkylene, R' is a monovalent hydrocarbon group free of aliphatic unsaturation selected from the group consisting of lower alkyl, aryl, lower alkaryl and lower aralkyl, and wherein R' can represent the same or different groups. .Iaddend.