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High-strength laminate

  • US 4,407,877 A
  • Filed: 05/27/1982
  • Issued: 10/04/1983
  • Est. Priority Date: 07/05/1974
  • Status: Expired due to Term
First Claim
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1. A high-strength generally continuous flexible laminate comprised of at least two generally continuous films each being biaxially oriented and generally weakly adhered to an adjacent such film in face-to-face relation, each such film being formed by extrusion with coincidental melt attenuation of a blend of at least two polymers which are sufficiently incompatible as to exhibit upon said extrusion an internal microscopic fibrillar morphology in which elongated fibrils are arranged in a generalized grain-like pattern having one predominant grain direction and imparting a corresponding direction of splittability to such film, such generalized grain pattern including fibrils having microscopically visible recurrent deflections from said predominant grain direction at intervals therealong which form a substantially zig-zagging specific grain configuration incorporated within said generalized grain pattern, the films being arranged in the laminate in such manner that the respective directions of splittability for at least two such films intersect each other.

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