US4239815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing recording sheets
Assignee: Fujifilm Holdings Corp
•
Filing: 1978-12-07
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Granted: 1980-12-16
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Expires: 1998-12-07
Abstract
Abstract A recording sheet for pressure-sensitive copying paper is produced by coating on a support a coating composition containing a water-soluble polyvalent metal salt and then a coating composition containing an alkali metal salt or an ammonium salt of an aromatic carboxylic acid. The recording sheet has excellent flatness and surface strength.
Inventors
- 👤 Hajime Kato
- 👤 Yasuhiro Ogata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:24
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155; Y; Y10; Y10S; Y10S428/00; Y10S428/914
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
42 words
A method of producing a recording sheet which comprises coating a support first with a coating composition containing a water-soluble polyvalent metal salt and then with a coating composition containing an alkali metal salt or ammonium salt of an aromatic carboxylic acid.
Claim 2
Independent Claim
42 words
A method of producing a recording sheet which comprises coating a support first with a coating composition containing a water-soluble polyvalent metal salt and then with a coating composition containing an alkali metal salt or ammonium salt of an aromatic carboxylic acid.
Claim 3
Dependent Claim
26 words
The method of claim 1, wherein said water-soluble polyvalent metal salt is a chloride, sulfate, nitrate, acetate or phosphate of zinc, tin, aluminum, magnesium, or calcium.
Claim 4
Dependent Claim
14 words
The method of claim 1, wherein said water-soluble polyvalent metal salt is zinc sulfate.
Claim 5
Dependent Claim
21 words
The method of claim 1, wherein said water-soluble polyvalent metal salt is zinc sulfate and the composition additionally contains zinc oxide.
Claim 6
Dependent Claim
98 words
The method of claim 1, wherein said aromatic carboxylic acid is a compound represented by the general formula ##STR2## wherein R 1 , R 2 , R 3 , R 4 and R 5 each represents a hydrogen atom, a halogen atom, a hydroxy group, an amino group, an alkylamino group, a nitro group, a formyl group, an alkyl group, a cycloalkyl group, an aryl group, an alkylaryl group, an aralkyl group, or an alkoxy group; and said R 1 and R 2 or R 3 and R 4 may combine to form a 5-membered or 6-membered ring.
Claim 7
Dependent Claim
26 words
The method of claim 1, wherein said polyvalent metal salt is coated in an amount of from about 0.005 g/m 2 to 10 g/m 2 .
Claim 8
Dependent Claim
27 words
The method of claim 1, wherein said aromatic carboxylic acid salt is coated in an amount of from about 0.1 g/m 2 to 3 g/m 2 .
Claim 9
Dependent Claim
29 words
The method of claim 1, wherein said aromatic carboxylic acid salt composition is coated immediately after said polyvalent metal salt composition while said polyvalent metal composition is still wet.
Claim 10
Dependent Claim
120 words
The method of claim 1 wherein said aromatic carboxylic acid comprises the addition reaction product of an aromatic carboxylic acid represented by the general formula ##STR3## wherein R 1 , R 2 , R 3 , R 4 and R 5 each represents a hydrogen atom, a halogen atom, a hydroxy group, an amino group, an alkylamino group, a nitro group, a formyl group, an alkyl group, a cycloalkyl group, an aryl group, an alkylaryl group, an aralkyl group, or an alkoxy group; and said R 1 and R 2 or R 3 and R 4 may combine to form a 5-membered or 6-membered ring; with an olefin having 4 to 18 carbon atoms or styrene or a derivative thereof.
Claim 11
Dependent Claim
29 words
The method of claim 1, wherein said coating compositions additionally contain an additive for improving the developing power of the compositions and the surface properties of the coated layer.
Claim 12
Dependent Claim
12 words
The method of claim 10, wherein said additive is a metal oxide.
Claim 13
Dependent Claim
13 words
The method of claim 1, wherein said coating compositions contain a water-soluble binder.
References Cited (Backward Citations)
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US3900215A
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US3871900A
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US4051303A
Cited
US4046941A
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US4159208A
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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) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |