US4251584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed polyolefin film or sheet product
Assignee: Hoechst AG
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Filing: 1978-10-26
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Granted: 1981-02-17
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Expires: 1998-10-26
Abstract
Abstract Disclosed is a film or sheet product comprising a closed cell foam comprised of a mixture of low density polyethylene and at least one ethylene polymer containing polar groups, and, optionally, a crystalline olefin polymer in which the mixture contains from about 0.025 to 1 percent by weight of said polar groups. Also disclosed is a method of making this film or sheet product and a wall covering material based thereon.
Inventors
- 👤 Gerardus van Engelen
- 👤 Tom van Utteren
- 👤 Hubertus Vonken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:51
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; B; B44; B44C; B44C1/00; B44C1/10; E; E04; E04F; E04F13/00; E04F13/002; C08J2323/00; C08J2323/02; C08J2323/04; C08J2423/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24496; Y10T428/24504; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/249921; Y10T428/249953; Y10T428/249976; Y10T428/249977; Y10T428/249982; Y10T428/249983; Y10T428/28
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
164 words
A wall or ceiling covering, comprising a layer having a thickness of from about 0.2 to 1 mm of a closed cell foamed thermoplastic synthetic resin, said layer having a low bulk density between about 30 and 400 kg/m 3 , a uniform, smooth and abrasion resistant surface which is readily printable and fine cell structure having an average cell diameter of between about 0.05 and 1 mm, said thermoplastic synthetic resin consisting essentially of a mixture of a low density polyethylene and a copolymer of ethylene and a comonomer containing polar groups, said comonomer being selected from the group consisting of an unsaturated carboxylic acid, a lower alkyl ester of an unsaturated carboxylic acid, a vinyl ester of a carboxylic acid and a vinyl halide, said mixture containing from about 0.1 to 0.7 percent by weight of said polar grops; and an amount between about 1 and 40 percent by weight of a filler sufficient to render the wall or ceiling covering opaque.
Claim 2
Dependent Claim
164 words
A wall or ceiling covering, comprising a layer having a thickness of from about 0.2 to 1 mm of a closed cell foamed thermoplastic synthetic resin, said layer having a low bulk density between about 30 and 400 kg/m 3 , a uniform, smooth and abrasion resistant surface which is readily printable and fine cell structure having an average cell diameter of between about 0.05 and 1 mm, said thermoplastic synthetic resin consisting essentially of a mixture of a low density polyethylene and a copolymer of ethylene and a comonomer containing polar groups, said comonomer being selected from the group consisting of an unsaturated carboxylic acid, a lower alkyl ester of an unsaturated carboxylic acid, a vinyl ester of a carboxylic acid and a vinyl halide, said mixture containing from about 0.1 to 0.7 percent by weight of said polar grops; and an amount between about 1 and 40 percent by weight of a filler sufficient to render the wall or ceiling covering opaque.
Claim 3
Dependent Claim
28 words
A wall or ceiling covering according to claim 1, wherein the mixture contains from about 0.1 to 15 percent by weight of said ethylene copolymer containing polar groups.
Claim 4
Dependent Claim
31 words
A wall or ceiling covering according to claim 1, wherein said ethylene copolymer containing polar groups has a density in the range of from about 0.910 to 0.950 g/cm 3 .
Claim 5
Dependent Claim
18 words
A wall or ceiling covering according to claim 1, wherein said ethylene copolymer comprises an ethylene/vinyl acetate copolymer.
Claim 6
Dependent Claim
21 words
A wall or ceiling covering according to claim 4, wherein said ethylene/vinyl acetate copolymer contains 5.5 percent by weight acetate groups.
Claim 7
Dependent Claim
28 words
A wall or ceiling covering according to claim 2, wherein the mixture contains from about 2.5 to 7.5 percent by weight of said ethylene copolymer containing polar groups.
Claim 8
Dependent Claim
29 words
A wall or ceiling covering according to claim 1, wherein said ethylene copolymer contains from about 1 to 60 percent by weight of said polar group containing comonomer units.
Claim 9
Dependent Claim
19 words
A wall or ceiling covering according to claim 1, in which the low density polyethylene comprises an ethylene homopolymer.
Claim 10
Dependent Claim
31 words
A wall or ceiling covering according to claim 1, in which at least one surface of the product has been subjected to a treatment improving the bonding properties of the surface.
Claim 11
Dependent Claim
17 words
A wall or ceiling covering according to claim 1, wherein the surface of the layer is embossed.
Claim 12
Dependent Claim
18 words
A wall or ceiling covering according to claim 1, wherein one surface of the layer bears an adhesive.
Claim 13
Dependent Claim
21 words
A wall or ceiling covering according to claim 11, further comprising a printed pattern applied to one surface of the layer.
Claim 14
Dependent Claim
28 words
A wall or ceiling covering according to claim 1, wherein said mixture further contains up to about 10 percent by weight of a crystalline high density polyethylene polymer.
Claim 15
Dependent Claim
25 words
A wall or ceiling covering according to claim 1, wherein one surface of said layer has a surface tension between about 30 and 40 mN/m.
Claim 16
Dependent Claim
25 words
A wall or ceiling covering according to claim 14, wherein one surface of said layer has a surface tension between about 32 and 35 mN/m.
Claim 17
Dependent Claim
21 words
A wall or ceiling covering according to claim 1, wherein the average cell size is between about 0.3 and 0.8 mm.
Claim 18
Dependent Claim
22 words
A wall or ceiling covering according to claim 1, wherein the bulk density is between about 100 and 250 kg/m 3 .
Claim 19
Dependent Claim
77 words
A wall or ceiling covering according to claim 1, said layer having been produced by a process comprising the steps of heat plastifying the polymer mixture, incorporating into the plastified mixture from about 1 to 20 percent by weight of a physical blowing agent selected from the group consisting of a volatile liquid or a gas to form a homogeneous mixture and thereafter extruding the homogeneous mixture at a temperature between about 100° C. and 120° C.
Claim 20
Dependent Claim
39 words
A wall or ceiling covering according to claim 18, wherein the amount of blowing agent is between about 10 and 15 percent by weight and said layer has a bulk density between about 100 and 250 kg/m 3 .
Claim 21
Dependent Claim
33 words
A wall or ceiling covering according to claim 18, wherein the blowing agent is selected from pentane, 1,1,2-trichloro-1,2,2-trifluoroethane, difluorodichloromethane, monofluoro-trichloromethane, hexane, petroleum ether (boiling points 40°-60° C. or 60°-80° C.) or methylene chloride.
Claim 22
Dependent Claim
32 words
A wall or ceiling covering according to claim 1, wherein said filler comprises between about 2 and 20% by weight of a whitening filler selected from titanium dioxide, zinc sulfide or chalk.
Claim 23
Dependent Claim
118 words
A wall or ceiling covering, comprising a layer having a thickness of from about 0.2 to 1 mm of a closed cell foamed thermoplastic synthetic resin, said layer having a low bulk density between about 30 and 400 kg/m.sup., a uniform, smooth and abrasion resistant surface which is readily printable and fine cell structure having an average cell diameter of between about 0.05 and 1 mm, said thermoplastic synthetic resin consisting essentially of a mixture of a low density polyethylene and a copolymer of ethylene and vinyl acetate, said mixture containing from about 0.1 to 0.7 percent by weight of the acetate ester groups; and an amount between about 2 and 20% by weight of a whitening filler.
Claim 24
Dependent Claim
118 words
A wall or ceiling covering, comprising a layer having a thickness of from about 0.2 to 1 mm of a closed cell foamed thermoplastic synthetic resin, said layer having a low bulk density between about 30 and 400 kg/m.sup., a uniform, smooth and abrasion resistant surface which is readily printable and fine cell structure having an average cell diameter of between about 0.05 and 1 mm, said thermoplastic synthetic resin consisting essentially of a mixture of a low density polyethylene and a copolymer of ethylene and vinyl acetate, said mixture containing from about 0.1 to 0.7 percent by weight of the acetate ester groups; and an amount between about 2 and 20% by weight of a whitening filler.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |