Patent US4118541A successfully refreshed from Google Patents.
US4118541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Release sheet of a coated cellulose paper
Assignee: Formica Corp
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Filing: 1976-11-03
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Granted: 1978-10-03
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Expires: 1996-11-03
Abstract
Abstract A release sheet useful in the production of heat and pressure consolidated laminates comprising a paper sheet having coated thereon a first coating comprising (A) an oil-modified alkyd resin crosslinked with a polyalkylether of a polymethylol melamine and a second coating, atop said (A), comprising (B) a copolymer of an unsaturated acid, ester or anhydride and a vinyl ether or an unsaturated alkyl compound.
Inventors
- 👤 George Edward Power
- 👤 Donald Louis Bolling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:54
CPC Classifications
D; D21; D21H; D21H27/00; D21H27/001; C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/46; C08G63/48; C09; C09D; C09D161/00; C09D161/20; C09D161/32; C09D167/00; C09D167/08; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2839; Y10T428/31504; Y10T428/31786; Y10T428/3179; Y10T428/31794; Y10T428/31797; Y10T428/31801; Y10T428/31804; Y10T428/31808; Y10T428/31812; Y10T428/31855; Y10T428/31859; Y10T428/31862; Y10T428/31866; Y10T428/3188; Y10T428/31895; Y10T428/31909
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
143 words
A release sheet for use in the production of laminates comprising (1) a cellulosic paper sheet coated with a first coating comprising (A) an oil-modified alkyd resin cross-linked with from about 30 to about 70%, by weight, based on the total weight of (A), of a polyalkylether of a polymethylol melamine and a second coating, atop said (A), comprising (B) a copolymer containing from about 15 to about 85 mole percent of recurring units having the formula ##STR3## wherein each R is, individually, OR 1 , R 1 being hydrogen or C 1 -C 22 alkyl, or the two R groups taken together form an oxa group, and the remaining units are recurring units of the formula ##STR4## wherein R 2 is hydrogen or methyl, R 3 is a C 9 -C 30 alkyl radical and X is O or CH 2 .
Claim 2
Dependent Claim
143 words
A release sheet for use in the production of laminates comprising (1) a cellulosic paper sheet coated with a first coating comprising (A) an oil-modified alkyd resin cross-linked with from about 30 to about 70%, by weight, based on the total weight of (A), of a polyalkylether of a polymethylol melamine and a second coating, atop said (A), comprising (B) a copolymer containing from about 15 to about 85 mole percent of recurring units having the formula ##STR3## wherein each R is, individually, OR 1 , R 1 being hydrogen or C 1 -C 22 alkyl, or the two R groups taken together form an oxa group, and the remaining units are recurring units of the formula ##STR4## wherein R 2 is hydrogen or methyl, R 3 is a C 9 -C 30 alkyl radical and X is O or CH 2 .
Claim 3
Dependent Claim
13 words
A release sheet according to claim 1 wherein said (1) is grease-proof paper.
Claim 4
Dependent Claim
13 words
A release sheet according to claim 1 wherein said (1) is glassine paper.
Claim 5
Dependent Claim
26 words
A release sheet according to claim 1 wherein said recurring units of component (B) are derived from maleic anhydride and a C 18 alkyl vinyl ether.
Claim 6
Dependent Claim
14 words
A release sheet according to claim 1 wherein said (1) is clay coated paper.
Claim 7
Dependent Claim
20 words
A release sheet according to claim 1 wherein the two R groups are taken together and form an oxa group.
Claim 8
Dependent Claim
13 words
A release sheet according to claim 1 wherein both R groups are hydrogen.
Claim 9
Dependent Claim
25 words
A release sheet according to claim 1 wherein R 2 is hydrogen, X is CH 2 and R 3 is a C 15 alkyl group.
Claim 10
Dependent Claim
37 words
A release sheet according to claim 1 wherein the two R groups are taken together and form an oxa group, R 2 is hydrogen, X is CH 2 and R 3 is a C 15 alkyl group.
Claim 11
Dependent Claim
17 words
A release sheet according to claim 1 wherein the polyalkylether of a polymethylol melamine is hexakismethoxymethyl melamine.
Claim 12
Dependent Claim
20 words
A release sheet according to claim 1 wherein the alkyd resin is derived from soya oil, isophthalic acid and glycerol.
Claim 13
Dependent Claim
35 words
A release sheet according to claim 1 wherein the alkyd resin is derived from soya oil, isophthalic acid and glycerol and the copolymer is derived from maleic anhydride and a C 18 alkyl vinyl ether.
Claim 14
Dependent Claim
30 words
A release sheet according to claim 1 wherein the alkyd resin is derived from soya oil, isophthalic acid and glycerol and the copolymer is derived from maleic anhydride and octadecene-1.
References Cited (Backward Citations)
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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) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |