Stabilized thermoplastic polyesterurethanes

Abstract

The instant invention is directed to novel color and hydrolytically stable thermoplastic polyester urethanes. The invention broadly consists of adding 2-oxazolidones to the components of the polyurethane, or to the polyurethane itself.

What is claimed is:  .[.1. A polyesterurethane stabilized against hydrolysis and/or processing discoloration by having incorporated therein a stabilizing amount of a 2-oxazolidone..].  .[.2. The stabilized polyesterurethane of claim 1 wherein the 2-oxazolidone has the formula ##STR8## wherein R represents hydrogen or an organic radical which is free of epoxide reactable groups, 
     
       n represents an integer of from 1 to 3..]. .[.3.  The stabilized polyesterurethane of claim 2 wherein R, X 1  and X 2  may be the same or different and represent a hydrogen atom or a radical selected from the group consisting of alkyl and cycloalkyl of from 1 to 12 carbon atoms and aryl, aralkyl and alkaryl of from 6 to 15 carbon atoms..]. .[.4. The stabilized polyesterurethane of claim 3 wherein X 1  and X 2  represent hydrogen..]. .[.5. The stabilized polyesterurethane of claim 4 wherein n=1..]. .[.6. The stabilized polyesterurethane of claim 5 wherein R is selected from the group consisting of hydrogen, ##STR9## 
     
     
         .[.7.  The stabilized polyesterurethane of claim 4 wherein n=2..]. .[.8. The stabilized polyesterurethane of claim 7 wherein R is selected from the group consisting of ##STR10## 
     
     
         .[.9.  The stabilized polyesterurethane of claim 1 wherein the 2-oxazolidone is present in an amount of from 0.02 to 6 percent by weight 
     
     
        based on the weight of the polyesterurethane..]. .Iadd.10.  A polyesterurethane stabilized against hydrolysis and/or processing discoloration by the addition of a stabilizing amount of a 2-oxazolidone-based compound of the formula: ##STR11## wherein R represents hydrogen or an organic radical which is free of epoxide reactable groups and n represents an integer of from 1 to 3. 
     
     
        .Iaddend. .Iadd.11.  The stabilized polyesterurethane of claim 10, wherein R is hydrogen or CH 3  -- and n is 1. .Iaddend. .Iadd.12. The stabilized polyesterurethane of claim 10, wherein R is --CH 2  -- or ##STR12## 
     
     
        and n is 2. .Iaddend. .Iadd.13.  The stabilized polyesterurethane of claim 10, wherein said 2-oxazolidone-based compound is present in an amount of from 0.02 to 6% by weight based on the weight of the polyesterurethane. .Iaddend.