WERKWIJZE VOOR HET VERVAARDIGEN VAN BIAXIAAL GESTREKTE POLYETHYLEEN-2,6-NAFTALAAT FOELIES.

摘要

1441304 Polyethylene naphthalate copolymer films TEIJIN Ltd 25 July 1973 [25 July 1972] 35490/73 Heading B5B A biaxially oriented film comprising a blended mixture of a polyethylene 2,6-naphthalate resin and 0À5 to 10% by wt. of a polyester resin, other than the polyethylene 2,6-naphthalate, in which the amount of the homopolyester unit is at least 90 mol per cent, and which has a softening point at least 1‹ C. higher than the equilibrium softening point is melt extruded from a melt of the said blended mixture, biaxially oriented by stretching longitudinally and transversely and then optionally heat treated.