Preparation of high solids poly(vinyl alcohol)/water solutions i

Details Preparation of high solids poly(vinyl alcohol)/water solutions i Preparation of high solids poly(vinyl alcohol)/water solutions i

1999-05-26

2000-08-22

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421123, 366 79, 366 97, 366 98, 366318, B29C 4738, B29C 4760

Patent

active

061067563

ABSTRACT:
A method for producing a high solids aqueous solution of poly(vinyl alcohol) in which substantially dry poly(vinyl alcohol) is first fed into a specially designed single screw extruder. Heated water is introduced through a separate entry port downstream of the feed end of the extruder. A temperature of 38 to 121.degree. C. and a back pressure of at least 20,786 kPa are applied to the extruder. The mixture of poly(vinyl alcohol) and water is conveyed through transition and metering sections of the single screw extruder to dispersive and distributive mixing sections to produce a high solids poly(vinyl alcohol) solution which is substantially free of gels. The high solids poly(vinyl alcohol) solution can be used directly in the production of products such as fibers and sheets.

REFERENCES:
patent: 4752136 (1988-06-01), Colby
patent: 5318357 (1994-06-01), Colby et al.
patent: 5798077 (1998-08-01), Womer et al.
patent: 5816698 (1998-10-01), Durina et al.
Translation of Japan 55-46303 (Nov. 22, 1980).
Translation of Japan 60-1333 (Jan. 14, 1985).
Abstract of NL8500428 (Apr. 16, 1986).

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