Polyester with high carboxyl end groups and methods for making

Details Polyester with high carboxyl end groups and methods for making Polyester with high carboxyl end groups and methods for making

2006-08-08

2006-08-08

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C264S176100, C264S219000, C428S034100, C428S035700, C528S271000

Reexamination Certificate

active

07087706

ABSTRACT:
The present invention relates to a polyester or copolyester composition containing a substituted cyclic anhydride, having a carboxyl end group of greater or equal to 25 mmol/kg. The present invention also concerns a method of making such a polyester or copolyester by late injection of the substituted cyclic anhydride at the end of polycondensation, or alternatively adding the substituted cyclic anhydride to the preform injection molding machine, prior to stretch blow molding a container.

REFERENCES:
patent: 3542737 (1970-11-01), Keck
patent: 4124571 (1978-11-01), Georgoudis
patent: 4698411 (1987-10-01), Hill
patent: 4753975 (1988-06-01), Vanderkooi
patent: 5244917 (1993-09-01), Petraitis et al.
patent: 5344937 (1994-09-01), Barnett et al.
patent: 5552475 (1996-09-01), Sundararaman et al.
patent: 6342578 (2002-01-01), Huang

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