Porous plastic film product, useful as a breathable wall covering or filters
First Claim
Patent Images
1. 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.
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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.
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Citations
57 Claims
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1. A permeable plastic film prepared by a process comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A process for preparing a permeable plastic film comprising the steps:
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(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. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A filter comprising a permeable plastic film produced by a process comprising:
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(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.
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55. A sound absorbing material comprising a permeable plastic film produced by a process comprising:
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(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.
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56. A process for reducing sound transmission from a room comprising:
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(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.
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57. A process for reducing mildew development within a wall comprising the steps:
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(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.
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Specification