Abstract: A shrink film comprising a biaxially oriented polymer film comprising polypropylene having a machine direction shrinkage and a transverse direction shrinkage that is less than or equal to 50% of the machine direction shrinkage, and wherein the machine direction shrinkage is greater than 15% and the transverse direction shrinkage is less than 10% at about 140.degree. C. The shrink film is formed by a process comprising subjecting a biaxially oriented polymer film to a treatment which comprises the heating the film to a temperature of about 100.degree. C. to 180.degree. C. The heated film is drawn under conditions to extend it by at least 1.05 times its original length in the machine direction. The drawn film is cooled under tension to produce a shrink film having the specified ratio between the machine direction shrinkage and the transverse direction shrinkage in addition to having a kinetic film-to-film coefficient of friction of about 0.05 to 0.40. The shrink film is suitable for wrapping contoured articles.

Abstract: An electron beam irradiated release film is formed from a melt processible composition including a silicone component crosslinked by the reaction of a hydride-containing silicone and a silicone containing an unsaturated substituent within a polymeric thermoplastic matrix to form a silicone pseudo-interpenetrating polymer network. The crosslinking of the silicone component by reaction of the hydride and unsaturated substituents is inititated during thermoplastic melt-mixing and film forming of the component with the matrix. Coated films are preferably formed by coextrusion of a polymeric thermoplastic film and a crosslinkable mixture of the silicone components and a polymeric thermoplastic. Alternatively, extrusion coating of the mixture onto a preformed film may be used to form the coated films. Preferably, these films have a thickness of from 0.000005 to 0.2 inch. The film is electron beam irradiated with a dose of from about 50 rad to about 50 Mrad.