Patent ID: 7442427
Filing Date: 2008-10-28
Classification: B29C,B29K,B32B,Y10S,Y10T

Abstract:
1. A coextruded, transparent, biaxially oriented polyester film comprising a base layer (B) and a heatsealable top layer (A) which is peelable from at least APET, the heatsealable and peelable top layer (A) consisting of a) about 80-98% by weight of polyester and b) about 2-10% by weight of inorganic and/or organic particles having an average diameter d wherein c) the polyester being composed of about 12-89 mol % of units which derive from at least one aromatic dicarboxylic acid and about 11-88 mol % of units which derive from at least one aliphatic dicarboxylic acid, the sum of the dicarboxylic acid-derived molar percentages being 100, d) the ratio of particle size d e) the layer thickness of the top layer (A) d f) said to layer (A) exhibits a surface roughness, Ra, ranging from greater than 100 to 400 nm, as determined via DIN 4768.