Patent ID: 6939600
Filing Date: 2005-09-06
Classification: B29C,B29K,B32B,C08J,Y10T

Abstract:
1. An opaque white film with a thickness of from 10 to 500 μm, wherein the film comprises a single crystallizable thermoplastic, barium sulfate, and optical brightener, wherein said crystallizable thermoplastic consists essentially of polyester, wherein the surface gloss of the film measured by DIN 67570 (measurement angle 20°) is greater than or equal to 10, and the luminous transmittance (transparency) of the film measured by ASTM-D1003 is less than or equal to 30%, said film has a Yellowness Index of less than or equal to 20 for 50 micron-thick films, and the film has a longitudinal modulus of elasticity of greater than or equal to 3,300 N/mm 2 , a transverse modulus of elasticity of greater than or equal to 4,200 N/mm 2 , a longitudinal tear strength of greater than 120 N/mm 2 , a transverse tear strength of greater than or equal to 170 N/mm 2 , a longitudinal elongation at break of greater than or equal to 120%, and a transverse elongation at break of greater than or equal to 50%.