BAND-SHAPED ARTICLE AND PRODUCTION PROCESS THEREFOR

摘要

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 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 and subjecting it to heat-setting; and a band-shaped article made from polyethylene terephthalate having an index X, represented by the formula X = Y + Z/10 (wherein Y is an intrinsic viscosity (dl/g) measured at 35.degree.C in an orthochlorophenol solvent, and Z is a melt flow rate (M.F.R., g/10 minutes) measured at 280.degree.C under a load of 2.16 kg), of 2.75 to 3.75.