Use of cyclic carbonic acid esters as solvents for poly-(.beta.-

Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion

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195 2, 528491, C08G 6306, C08G 6372

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active

041407415

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 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: 3036959 (1962-05-01), Baptist
patent: 3044942 (1962-07-01), Baptist
patent: 3275610 (1966-09-01), Coty
Smith et al., "Metabolism of poly-(.beta.-hydroxybutyrate)", Chemical Abstracts 69, 102949h (1968).

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