Method of making water-soluble films from polyvinyl alcohol comp

Details Method of making water-soluble films from polyvinyl alcohol comp Method of making water-soluble films from polyvinyl alcohol comp

1978-08-11

1979-05-22

Lieberman, Allan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

B29D 702, B29D 704

Patent

active

041559711

ABSTRACT:
Compositions consisting essentially of a (i) resin mixture containing a low molecular weight polyvinyl alcohol and a medium molecular weight polyvinyl alcohol, and optionally, a copolymer of vinyl alcohol and an ethylenically unsaturated ester and (ii) as a plasticizer a polyethylene glycol, are used for preparing films by melt extrusion. The compositions, in the form of powder or granules, or preferably pellets, are melted, extruded through a slit or annulus, quenched by air and then drawn down and/or blown to form a thin film. Such drawing or blowing can impart orientation to the film. The films are suitable for use as packaging film in automatic packaging equipment. They can be used to package pulverulent materials, and the film package containing the pulverulent material can be charged directly to water in which the film will dissolve, thus eliminating the problem of user contact and exact measuring of the package contents, as well as disposal of containers in which the pulverulent materials would otherwise be packaged. Moreover, the films provide enhanced resistance to breakage of packages made therefrom when such packages are handled or shipped, even under cold or dry conditions.

REFERENCES:
patent: 2948697 (1960-08-01), Robertson
patent: 3157611 (1964-11-01), Lindemann
patent: 3365413 (1968-01-01), Monoghan et al.
patent: 3374195 (1968-03-01), Bianco et al.
patent: 3510542 (1970-05-01), Strand
patent: 3607812 (1971-09-01), Takigawa
patent: 3882196 (1975-05-01), Hanke
patent: 3997489 (1976-12-01), Coker

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