Polymer film treatment with organic impregnant

Details Polymer film treatment with organic impregnant Polymer film treatment with organic impregnant

1982-09-01

1983-12-13

Lusignan, Michael R.

Coating processes

Immersion or partial immersion

264182, 264343, 524377, D01F 618, B29C 2500, B05D 118

Patent

active

044205147

ABSTRACT:
Acrylonitrile polymer film is treated with non-volatile water-miscible glycol plasticizer to improve toughness and other film properties. In a unique, continuous, steady state process polyacrylonitrile aquagel strip is treated with plasticizer additive in concentrated aqueous solution. Aquagel strip is passed at substantially constant rate through a solution treatment bath. The aquagel strip, which may contain at least about 40 weight % water uniformly dispersed in the polyacrylonitrile, is contacted with the aqueous solution during a predetermined residence time in the bath. After passing the treated aquagel strip from the bath, excess aqueous additive solution is removed. The plasticizer additive can be metered to the aqueous solution at concentration greater than the aqueous additive solution of the bath at a rate substantially proportionate to desired steady state uptake of additive for the aquagel strip. By impregnating the film with a low molecular weight glycol such as triethylene glycol, or higher molecular weight poly (ethylene glycol) in-line plasticizer addition is achieved. Novel glycol-plasticized acrylonitrile polymers and packaging films are made.

REFERENCES:
patent: 2601254 (1952-06-01), Bruson et al.
patent: 2715112 (1955-08-01), Stanton et al.
patent: 3015570 (1962-01-01), Bowman et al.
patent: 3129273 (1964-04-01), Lowes
patent: 3400187 (1968-09-01), Farrow
patent: 3519462 (1970-07-01), Bristol et al.

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