Polyester container and process for producing the same
AssigneeKao Corporation
InventorsYasunori Hosokawa, Nobuyuki Mita, Yutaka Yasuda
Life of this patent
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Abstract
A process for producing a polyester container having a higher strength than usual and a reduced wall thickness, whereby the polyester is present in a reduced amount contributing to resource savings, which includes preparing a polyester resin composition containing a polyester resin and 0.1 to 10 parts by weight, based on 100 parts by weight of the polyester resin, of an additive compound selected from the group consisting of compounds represented by the formula (I): ##STR1## and compounds represented by the following formula (II): ##STR2## and subjecting the resin composition to stretch blow molding.
Claims18
A process for producing a polyester container having increased mechanical strength, which comprises:
- (a) preparing a polyester resin composition comprising a polyester resin and 1 to 5 parts by weight, based on 100 parts by weight of the polyester resin, of an additive compound represented by the formula (I):
- ##STR11## where A.sub.1 and A.sub.2 are each an alkyl or aralkyl group having 6 to 22 carbon atoms and X is ##STR12## wherein R.sub.1 and R.sub.2 are each an alkyl group having 4 or fewer carbon atoms,
- (b) forming a preform from said resin composition, and
- (c) stretch blow molding said preform to an areal stretching ratio of 4 or more, to form said polyester container.
In a process for producing a polyester container having increased mechanical strength by (a) forming a preform from a polyester resin composition and (b) stretch blow molding said preform to an areal stretch ratio of 4 or more to form said polyester container, the improvement comprising forming said preform from a polyester resin composition comprising:
- (1) a polyester resin;
- and
- (2) 1 to 5 parts by weight, based on 100 parts by weight of said polyester resin, of an additive compound represented by the formula (I):
- ##STR14## wherein A.sub.1 and A.sub.2 are each an alkyl or aralkyl group having 6 to 22 carbon atoms and X is ##STR15## --S--, --SO.sub.2 --, --O--wherein R.sub.l and R.sub.2 are each an alkyl group having 4 or fewer carbon atoms.
Dependencies are inferred from the claim text.