Patent ID: 6207093
Filing Date: 2001-03-27
Classification: B29C,B29K,Y10S

Abstract:
In a process for producing a polyolefin film, the steps comprising:a. providing a polymer mixture comprising an isotactic propylene homopolymer and isotactic propylene-ethylene co-polymer containing no more than 1.0 weight percent ethylene, and having incorporated therein:a processing modifier selected from the group consisting of a resin and a rosin, in an amount within the range of 1 to 30 weight percent of said mixture, said resin selected from the group consisting of polyterpene resins, petroleum resins, polyindene resins, coumaroneindene resins, and styrene resins, said rosin being selected from the group consisting of wood rosin, gum rosin, toll oil rosin including hydrogenated, partially hydrogenated, dehydrogenated, and disproportionated polymerization products thereof; anda syndiotactic polypropylene in an amount within the range of 2 to 10 weight percent of said mixture; andb. forming a biaxially oriented film layer of said polymer mixture having an exposed surface by stretching said polymer mixture in longitudinal and transverse directions.