Porous plastic film product, useful as a breathable wall coverin

Details Porous plastic film product, useful as a breathable wall coverin Porous plastic film product, useful as a breathable wall coverin

1992-11-30

1993-11-16

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 73, 521 79, 521 85, 521 88, 521 90, 522 33, 522 39, 522 42, 522 44, C08G 1814

Patent

active

052624447

ABSTRACT:
The invention relates to a breathable, plastic film, useful as a wall covering material. A low boiling additive, such as water, is added to a plastisol before extrusion. During extrusion and curing of the plastisol into a film or coating, the low boiling additive is volatilized and the resulting evolved gas perforates the forming film. In this manner a permeable plastic film, such as vinyl, is produced.

REFERENCES:
patent: 2819981 (1958-01-01), Schornstheimer et al.
patent: 4713264 (1987-12-01), Clark et al.
patent: 4828881 (1989-05-01), Brown et al.
patent: 4894274 (1990-01-01), Graham et al.

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