Patent ID: 7238419
Filing Date: 2007-07-03
Classification: B32B,C08J,Y10S,Y10T

Abstract:
1. A white opaque film comprising (i) crystallizable thermoplastic consisting essentially of polyethylene terephtalate, polytrimethylene terephthalate, polybutylene terephthalate, poly(1,4-cyclohexanedimethylene terephthalate), polyethylene naphthalene-2,6-dicarboxylate, polyethylene naphtalene-1,5-dicarboxylate, polytrimethylene naphthalate, polyethylene naphthalate/bibenzoate or mixtures thereof or derivates thereof, (ii) barium sulfate, (iii) titanium dioxide, (iv) at least one optical brightener, and (v) at least one dye, soluble in the thermoplastic wherein said film exhibits a yellowness index of 1 to 15, based on a 50 micron film; a dielectric strength of greater than 150 kV/mm; and a transparency of 1 to less than 20%, based on a 50 micron film.