Multilayer polyacrylonitrile film

Details Multilayer polyacrylonitrile film Multilayer polyacrylonitrile film

1981-04-03

1982-10-12

Lesmes, George F.

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428327, 428522, 264146, B32B 2780, B32B 516

Patent

active

043539670

ABSTRACT:
A novel multilayer film is made by extruding and/or casting at least two layers of resin, such as polyacrylonitrile homopolymer or interpolymers. By co-extruding a continuous multilayer film with contiguous or tandem dies from a first supply of homogeneous resin solution and a second supply of non-homogeneous redissolved resin scrap, a film may be cast onto a smooth cooled drum surface to form substantially continuous adjacent layers from two or more resin supplies. Scrap resin, such as selvage trimmed from stretched film or mill scrap, is comminuted and redissolved in solvent for recycle to the second supply of the extrusion step. The homogeneous layer prevents film disruption by inhomogeneities present in the contiguous layer containing redissolved scrap, which might cause localized stresses in the film and discontinuities during stretching.

REFERENCES:
patent: 3182100 (1965-05-01), Bedell
patent: 3448183 (1969-06-01), Chisholm
patent: 3819773 (1974-06-01), Pears
patent: 3976730 (1976-08-01), Cushing
patent: 3993810 (1976-11-01), Bonis
patent: 4013745 (1977-03-01), Brinkmann et al.
patent: 4066731 (1978-01-01), Hungerford
patent: 4086045 (1978-04-01), Thiel et al.
patent: 4165210 (1979-08-01), Corbett

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