US4722868A
Expired / Lapsed
US
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Inkable sheet
Assignee: Imperial Chemical Industries Ltd
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Filing: 1986-04-14
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Granted: 1988-02-02
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Expires: 2006-04-14
Abstract
Abstract An inkable sheet comprises a base sheet, such as a PET film, having on a surface thereof an ink-absorbent resin matrix comprising a vinyl pyrrolidone polymer and an ester of cellulose containing free carboxylic acid groups. A preferred matrix additionally comprises a vinyl alcohol polymer.
Inventors
- 👤 John A. Pope
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:55
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/50; B41M5/52; B41M5/5254; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/3179
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
32 words
An inkable sheet comprising a base sheet having on a surface thereof an ink-absorbent polymeric resin matrix comprising a vinyl pyrrolidone polymer and an ester of cellulose containing free carboxylic acid groups.
Claim 2
Dependent Claim
32 words
An inkable sheet comprising a base sheet having on a surface thereof an ink-absorbent polymeric resin matrix comprising a vinyl pyrrolidone polymer and an ester of cellulose containing free carboxylic acid groups.
Claim 3
Dependent Claim
18 words
An inkable sheet according to claim 1 wherein the polymeric resin matrix additionally comprises a vinyl alcohol polymer.
Claim 4
Dependent Claim
50 words
An inkable sheet according to either of claims 1 or 2 wherein the ester of cellulose containing free carboxylic acid groups is an ester of cellulose with a polybasic carboxylic acid or a mixed ester of cellulose derived from at least one polybasic carboxylic acid and an other carboxylic acid.
Claim 5
Dependent Claim
38 words
An inkable sheet according to any one of the preceding claims wherein the resin matrix comprises (a) a vinyl pyrrolidone polymer (b) a partially hydrolysed polyvinyl alcohol and (c) an ester of cellulose containing free carboxylic acid groups.
Claim 6
Dependent Claim
19 words
An inkable sheet according to claim 4 wherein the weight ratio of components (a):(b):(c) in the matrix is (1.0-2.0):(1.0-2.0):1.0.
Claim 7
Dependent Claim
20 words
An inkable sheet according to any one of the preceding claims wherein the ester of cellulose is cellulose acetate phthalate.
Claim 8
Dependent Claim
24 words
An inkable sheet according to any one of the preceding claims comprising at least one primer layer between the base sheet and resin matrix.
Claim 9
Dependent Claim
22 words
An inkable sheet according to any one of the preceding claims wherein the base sheet comprises a biaxially oriented polyethylene terephthalate film.
Claim 10
Dependent Claim
30 words
An imaged transparency for use in a transmission mode comprising a sheet according to any one of the preceding claims having an inked image applied to the polymeric resin matrix.
Claim 11
Independent Claim
54 words
A method of preparing an inkable sheet comprising applying to a surface of a base sheet a coating medium comprising a vinyl pyrrolidone polymer and a thermally decomposable carboxylic ester salt of cellulose, and drying the applied coating medium to yield a substantially water-insoluble, ink-absorbent polymeric matrix on a surface of the base sheet.
Claim 12
Independent Claim
54 words
A method of preparing an inkable sheet comprising applying to a surface of a base sheet a coating medium comprising a vinyl pyrrolidone polymer and a thermally decomposable carboxylic ester salt of cellulose, and drying the applied coating medium to yield a substantially water-insoluble, ink-absorbent polymeric matrix on a surface of the base sheet.
Claim 13
Dependent Claim
37 words
A method according to claim 10 wherein the ester salt is formed by reacting the free carboxylic acid groups in the cellulose ester with an alkaline reagent which is volatile at a temperature not exceeding 150° C.
Claim 14
Independent Claim
20 words
A method according to either of claims 10 or 11 wherein the coating medium additionally comprises a vinyl alcohol polymer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |