Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1983-04-21
1986-05-27
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
5283081, 528483, 528490, 528500, 528501, C08G 6316
Patent
active
045916292
ABSTRACT:
A method for reducing the volatile component content of crude high molecular weight polyesters containing said component. The method comprises first contacting the crude polyester with steam, or a mixture of steam and inert gas and/or air, at a temperature of 100.degree. to 245.degree. C. to form a partially treated polyester. The second step comprises further contacting the product of the first step with an inert gas and/or air at a temperature of 200.degree. to 245.degree. C. to produce the purified polyester.
In particular, the method is intended for use with such polyesters as polyethylene terephthalate which contains acetaldehyde as the undesired volatile component.
A new method of analysis useful in the foregoing process is also disclosed. The products of the new process are primarily intended for use in the manufacture of plastic bottles or similar containers for use in the foodstuffs industry.
REFERENCES:
patent: 3756990 (1973-09-01), Jaeger et al.
patent: 4230819 (1980-10-01), Hauenstein et al.
patent: 4263425 (1981-04-01), Rothe et al.
patent: 4289871 (1981-09-01), Rowan et al.
patent: 4390398 (1983-06-01), Coker et al.
Domeisen Bruno
El-Ghatta Hussain
Philipp Hans-Werner
Sailer Richard
Ems-Inventa AG
Phynes Lucille M.
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