Processing of polyesters

Details Processing of polyesters Processing of polyesters

1997-07-14

1999-02-23

Acquah, Samuel A.

Plastic and nonmetallic article shaping or treating: processes

Treating shaped or solid article

By a temperature change

528361, 528502, 528503, 2641761, 26421112, 26433111, B32B 1700, C08F 600

Patent

active

058740406

ABSTRACT:
Process for improving mechanical properties of an aged polyester composition consisting essentially of copolymer of hydroxybutyrate units and hydroxyvalerate units which comprises heating the polyester at a temperature whereby (i) the polyester is restored to its original non-aged properties, and (ii) subsequent ageing of the polyester is retarded as indicated by substantial improvement of at least one measurement indicative of ageing compared to non heat treated polyester of the same age. The invention includes the polyester composition and shaped articles which have been subjected to the process and in which ageing is retarded.

REFERENCES:
Saiki, et al: "Stretching of poly (beta-hydroxybutyric acid) molding", Chemical Abstracts, vol. 105, No. 14, Oct. 6, 1986, abstract No. 116100 & JP,A,61 069 431, Apr. 10, 1986.
De Koning, et al: "Crystallization phenomena in bacterial Nol 34, No. 19, 1993, pp. 4089-4094.

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