Patent ID: 7833617
Filing Date: 2010-11-16
Classification: B32B,Y10T

Abstract:
1. A white, coextruded, oriented, laser cuttable polyester film comprising a base layer (B) and with at least one polyester outer layer (A), wherein a. the base layer (B) comprises a whitening pigment and/or void-forming incompatible polymer at a concentration of from 2 to 35% by weight, based on the weight of the base layer (B), and from 0.1 to 15% by weight, based on the weight of the base layer (B), of a pigment that absorbs laser energy, and b. the outer layer (A) comprises a whitening pigment and/or void-forming incompatible polymer at a concentration of from 1.0 to 35% by weight, based on the weight of the outer layer (A), where this pigment and/or polymer is identical to or different from the pigment and/or polymer in the base layer (B), and outer layer (A) comprises less than 0.5% by weight of pigment that absorbs laser energy and said outer layer (A) ranges in thickness from 0.4 to below 40 microns.