POLYESTER COMPOSITIONS FOR HOT-FILL CONTAINERS

摘要

Disclosed is a polyester composition comprising: a polyester consisting essentially of: diacid residues consisting essentially of terephthalic residues; and diol residues consisting essentially of about 92 to 98 mole percent ethylene glycol residues, about 1 to 4 mole percent diethylene glycol (DEG) residues, and about 1 to 4 mole percent 1,4-cyclohexanedimethanol (CHDM) residues; and having an inherent viscosity (IhV) which satisfies the equations IhV-X-Y = 0.74 to 0.80, wherein X is the mole fraction of CHDM and Y is the mole fraction of DEG; and at least one reheat enhancing aid in an amount sufficient to provide between about 5 and 25 % reheat improvement. Also disclosed are heat set containers suitable for packaging hot-filled liquids and processes for the manufacture of such heat set containers.