Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1977-01-12
1978-07-18
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
195 2, 528361, C08G 6306
Patent
active
041015339
ABSTRACT:
The use of cyclic carbonic acid esters of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4, which may be the same or different, are hydrogen or alkyl with 1 to 6 C-atoms, as a solvent for racemic or optically active poly-(.beta.-hydroxybutyric acid).
The preferred embodiment uses hot (120.degree. to 150.degree. C) ethylene carbonate or 1,2-propylene carbonate to extract poly-(.beta.-hydroxybutyric acid) from moist or dry fermentation masses. These solvents have the advantage that the extracted poly-(.beta.-hydroxybutyric acid) is precipitated in good yield from them on cooling. In addition they may be recycled without the need for a solvent regeneration step. These cyclic carbonic acid esters may also be used as the solvent in the processing of poly-(.beta.-hydroxybutyric acid) by e.g. wet spinning.
REFERENCES:
patent: 3275610 (1966-09-01), Coty
Smith et al., Metabolism of Poly(.beta.-hydroxybutyrate), Chem. Abst. 69, 102949h (1968).
Wiejak, "Finely Divided Polyesters", Chem. Abstracts, 73, 78155f (1970).
Heinzle Elmar
Lafferty Robert M.
Agroferm AG
Anderson Harold D.
Nielsen E. A.
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