Patent ID: 6214269
Filing Date: 2001-04-10
Classification: B29C,B29K,C08J,C08L

Abstract:
A process for producing a band-shaped article comprising:(1) the step (reaction step) of obtaining molten polyethylene terephthalate (B) having a high degree of polymerization and having an intrinsic viscosity higher than the intrinsic viscosity of the polyethylene terephthalate (A) by at least 0.05 dl/q by heating and melting (a) 100 parts by weight of polyethylene terephthalate (A), (b) 0.1 to 10 parts by weight of a bifunctional epoxy compound and (c) an epoxy ring-opening catalyst;(2) the step (extrusion step) of extruding the obtained molten product into a sheet from a die; and(3) the step (stretching step) of stretching the obtained sheet to 5 to 15 times in a longitudinal direction based on the original length of the sheet and subjecting it to heat-setting.