Procedure for the manufacture of a mixture of starch and polyvin

Details Procedure for the manufacture of a mixture of starch and polyvin Procedure for the manufacture of a mixture of starch and polyvin

1989-12-08

1991-07-16

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

To form particulate product

26421111, 26421123, 264330, 425204, 524 47, B29B 912

Patent

active

050323377

ABSTRACT:
50 to 95 parts by weight starch and 5 to 50 parts by weight polyvinyl alcohol with a degree of saponification between 87 and 100% are thoroughly mixed and furthermore the moisture content of the mixture is regulated between 10 and 25 weight %. Subsequently the mixture obtained is subjected to a thermo-mechanical treatment at a temperature situated between 110.degree. and 180.degree. C. During the extrusion the mixture is subjected to shearing forces so that the product obtained when it is dispersed in cold water and subsequently is centrifuged, divides into a watery phase and a coacervate phase without a sediment of undissolved polyvinyl alcohol being formed.

REFERENCES:
patent: 2239718 (1941-04-01), Izard
patent: 2251296 (1941-08-01), Shipp
patent: 3256115 (1966-06-01), Stearns et al.
patent: 3316190 (1967-04-01), Suzumura
patent: 3497487 (1970-02-01), Bristol
patent: 3767604 (1973-10-01), Hjermstad et al.
patent: 4206101 (1980-06-01), Wysong
patent: 4425452 (1984-01-01), Nakata et al.
patent: 4871410 (1989-10-01), Bonnebat et al.
Westhoff, et al., "Starch-Polyvinyl Alcohol Films-Effect of Various Plasticizers", 402 Starch/Starke, vol. 31, No. 5, 5/79.

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