Method of producing highly condensed polyester granulate

Details Method of producing highly condensed polyester granulate Method of producing highly condensed polyester granulate

2006-08-01

2006-08-01

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, C428S411100, C428S412000, C528S176000, C528S271000

Reexamination Certificate

active

07084235

ABSTRACT:
Latent heat crystallized polyesters and copolyesters of a degree of crystallization greater than 38% and made by a process in which, without prior additive admixtures and without further cooling, the granulate is fed directly from the latent heat crystallization into a solid phase polycondensation reactor and condensed to a higher viscosity and subjected to acetaldehyde reduction. Alternatively without additive admixtures the granulate is subjected to dealdehydization and then worked up into bottles.

REFERENCES:
patent: 4820795 (1989-04-01), Hirata et al.
patent: 6852256 (2005-02-01), Borer et al.

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