Process for preparing cold water-soluble films from PVA by melt

Details Process for preparing cold water-soluble films from PVA by melt Process for preparing cold water-soluble films from PVA by melt

1978-08-25

1981-05-12

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264176R, 264211, 264564, B29C 1707

Patent

active

042671450

ABSTRACT:
Films, 0.5-10 mils thick, which are rapidly and completely soluble in cold water, and which are suitable for use as packaging film in automatic packaging equipment, can be prepared by conventional melt extrusion processes when prepared from a novel composition consisting essentially of 5-20 parts by weight of a polyethylene glycol (having an average molecular weight in the range between 325 and 550) in 100 parts by weight of a partially hydrolyzed low molecular weight polyvinyl alcohol.

REFERENCES:
patent: 2948697 (1960-08-01), Robertson
patent: 3157611 (1964-11-01), Lundemann
patent: 3374195 (1968-07-01), Bianco et al.
patent: 3413229 (1968-11-01), Bianco et al.
patent: 3607812 (1971-09-01), Takagawa et al.
patent: 3882196 (1975-05-01), Hanke
"Noniomic Surfactant", by Schick, M. J., Marcel Dekker, Inc. N.Y., 1967, p. 1065.
"The Cond. Chem. Dictionary", 8th Ed., by Hawley Van Nostrand, N.Y., pp. 706 and 710, 1976.

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