Removal of solvent from gels of poly(hydroxybutyrate) and shaped

Details Removal of solvent from gels of poly(hydroxybutyrate) and shaped Removal of solvent from gels of poly(hydroxybutyrate) and shaped

1980-08-04

1982-11-23

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264211, 264322, 528502, D01D 512

Patent

active

043604889

ABSTRACT:
A process of forming shaped articles comprising forming a free draining gel from a solution of poly(hydroxybutyrate) in a poor solvent under conditions which cause crystallization of the polymer and subjecting the gel to a non-random deformation process so that the associated solvent is expressed. Some residual solvent may be present and can assist in subsequent fabrication processes but the solvent may also be completely removed for such processes. The resulting products have good physical properties, after uniaxial or biaxial drawing.

REFERENCES:
patent: 2684348 (1954-07-01), Dietrich et al.
patent: 2963340 (1960-12-01), Satterthwaite
patent: 3036959 (1962-05-01), Baptist
patent: 3044942 (1962-07-01), Baptist
patent: 3242246 (1966-03-01), Stand
patent: 4127624 (1978-11-01), Keller et al.
patent: 4137394 (1979-01-01), Meihuizen et al.
patent: 4140741 (1979-02-01), Lafferty et al.

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