Patent ID: 7700015
Filing Date: 2010-04-20
Classification: C08J,Y02W,Y10S

Abstract:
1. A process for production of a biaxially oriented film which comprises extruding or coextruding a composition comprising (i) at least one crystallizable thermoplastic as main constituent (ii) at least 500 ppm, based on the weight of the thermoplastic, of a pigment, and (iii) a total of from 60 to 100% by weight, based on the weight of the film, of a mixture of recycled material formed entirely from said film, wherein the molecular weight of at least 20% by weight, based on the weight of the film, of recycled material formed entirely from said film within said recycle mixture has been increased by condensation processes prior to said extruding or coextruding step, and said film exhibits a modulus of elasticity in the transverse direction of greater than or equal to 5100 N/mm wherein the standard viscosity SV (DCA) of the recycled material has been increased by the condensation process by at least 100 up to the standard viscosity SV (DCA) of said crystallizable thermoplastic prior to said extrusion or coextrusion, and wherein the mixture of recycled material includes from 10 to 40% by weight, based on the weight of the film, of additional recycled material other than the recycled material whose molecular weight has been increased.