Process for surface-modifying polypropylene or polyethylene

Details Process for surface-modifying polypropylene or polyethylene Process for surface-modifying polypropylene or polyethylene

1992-06-11

1993-04-06

Pianalto, Bernard

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

427171, 427379, 4274123, B32B 2708, B05D 312, B21F 900, D06C 300

Patent

active

052002748

ABSTRACT:
A process for coating a polypropylene or polyethylene surface with a maleic acid-grafted polypropylene or polyethylene copolymer, and stretching the surface to increase permeability without damaging the coated surface. In this process, a dope containing the graft copolymer is applied to the polypropylene or polyethylene surface, e.g. by dip coating, at a temperature high enough to keep the copolymer solvated in the dope solvent; the surface is then dried. The permeability of the surface is improved by stretching the surface at least about 50% beyond its original area or length such that when the stretching force is released a residual strain of less than about 11% exists. The stretching operation may be done simultaneously with or subsequent to the coating operation.

REFERENCES:
patent: 3483273 (1969-12-01), Prucnal et al.
patent: 3860442 (1975-01-01), Natta et al.
patent: 4081424 (1978-03-01), Gergen et al.
patent: 4107130 (1978-08-01), Gergen et al.
patent: 4110303 (1978-08-01), Gergen et al.
patent: 4455273 (1984-06-01), Harpell et al.
patent: 4584347 (1986-04-01), Harpell et al.

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