Process for making laminar articles of polyolefin and a condensation polymer

Claim 1

A process for manufacturing a laminar, shaped, article of polymeric material comprising the steps of: (i) establishing a method, heterogeneous, blend of 60-95 weight percent polyolefin, 5 to 40 weight percent of a condensation polymer incompatible with the polyolefin, and 0.25 to 12 weight percent of an alkylcarboxyl-substituted polyolefin with an unsaturated monomer having a carboxylic moiety grafted to a polyolefin, by heating the blend above the melting point of the highest melting polymer component; and (ii) forming the melted blend by (a) stretching a body of the melt 100 to 500 percent in at least one direction and (b) cooling the stretched body to below the melting point of the lowest melting polymer component wherein the polyolefin is present, in the article, in the form of a continuous matrix phase and the condensation polymer incompatible with the polyolefin is present, in the article, in the form of a discontinuous distribution of thin, substantially two-dimensional, parallel and overlapping layers and the alkylcarboxyl-substituted polyolefin is present between the matrix and the layers and adheres the matrix and the layers together.