Porous plastic film product, useful as a breathable wall covering or filters
AssigneeBorden, Inc.
InventorsGeorge Rusincovitch, Paul J. Roe, Richard C. Andrews
Life of this patent
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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.
Claims57
A permeable plastic film prepared by a process comprising:
- (1) combining a curable plastic and a plasticizer to form a plastisol;
- (2) combining with the plastisol an additive with a boiling point below the boiling point of the plastisol;
- (3) extruding the mixture from step (2) to form a film;
- (4) curing the film from step (3) under conditions whereby the additive volatilizes through the cured or curing film to thereby leave a multiplicity of holes in the resulting plastic film.
A process for preparing a permeable plastic film comprising the steps:
- (1) combining a curable plastic and a plasticizer to form a plastisol;
- (2) combining with the plastisol an additive with a boiling point below the boiling point of the plastisol;
- (3) extruding the mixture from step (2) to form a film;
- (4) curing the film from step (3) under conditions whereby the additive volatilizes through the cured or curing film to thereby leave a multiplicity of holes in the resulting plastic film.
A filter comprising a permeable plastic film produced by a process comprising:
- (1) combining a curable plastic and a plasticizer to form a plastisol;
- (2) combining with the plastisol an additive with a boiling point below the boiling point of the plastisol;
- (3) extruding the mixture from step (2) to form a film;
- (4) curing the film from step (3) under conditions whereby the additive volatilizes through the cured or curing film to thereby leave a multiplicity of holes in the resulting plastic film.
A sound absorbing material comprising a permeable plastic film produced by a process comprising:
- (1) combining a curable plastic and a plasticizer to form a plastisol;
- (2) combining with the plastisol an additive with a boiling point below the boiling point of the plastisol;
- (3) extruding the mixture from step (2) to form a film;
- (4) curing the film from step (3) under conditions whereby the additive volatilizes through the cured or curing film to thereby leave a multiplicity of holes in the resulting plastic film;
- which plastic film can reduce sound transmission better than a plastic film without the multiplicity of holes.
A process for reducing sound transmission from a room comprising:
- (1) combining a curable plastic and a plasticizer to form a plastisol;
- (2) combining with the plastisol an additive with a boiling point below the boiling point of the plastisol;
- (3) extruding the mixture from step (2) to form a film;
- (4) curing the film from step (3) under conditions whereby the additive volatilizes through the cured or curing film to thereby leave a multiplicity of holes in the resulting plastic film which plastic film can reduce sound transmission better than a plastic film without the multiplicity of holes;
- and
- (5) applying at least one layer of said film to the walls of a room, whereby the sound transmission from the room through the wall is reduced.
A process for reducing mildew development within a wall comprising the steps:
- (1) combining a curable plastic and a plasticizer to form a plastisol;
- (2) combining with the plastisol an additive with a boiling point below the boiling point of the plastisol;
- (3) coating the mixture from step (3) onto a substrate selected from the group consisting of paper, cotton, felt, polyester, cellulose, fiberglass and polyolefin;
- (4) curing the coating under conditions whereby the additive volatilizes through the cured or curing film to thereby leave a multiplicity of holes in the resulting coated substrate;
- (5) applying the coated substrate to a wall, whereby water vapor within the wall can permeate the coated substrate to reduce mildew development within the wall.
Dependencies are inferred from the claim text.