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US4567496A
Expired / Lapsed
US
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Pressure-sensitive recording sheets
Assignee: Fujifilm Holdings Corp
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Filing: 1983-06-17
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Granted: 1986-01-28
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Expires: 2003-06-17
Abstract
Abstract A pressure-sensitive recording sheet is described. The sheet is comprised of a paper substrate which is treated with succinic acid derivatives having an alkenyl group or alkyl group containing from 4 to 18 carbon atoms, or salts thereof. This pressure-sensitive recording sheet is greatly reduced in the formation of fog which occurs in printing the sheet. Thus, it is very useful as no carbon paper.
Inventors
- 👤 Yasuhiro Ogata
- 👤 Masakazu Maekawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:40
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/1246; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31971; Y10T428/31993; Y10T428/31996
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
104 words
A pressure-sensitive recording sheet comprising a paper substrate which contains therein a succinic acid derivative having an alkenyl or alkyl group, or a salt thereof, said group containing from 4 to 18 carbon atoms and a layer containing an electron-donating color former and/or an electron-accepting color developer, wherein the succinic acid derivative or salt thereof is present in an amount within the range of 0.01 to 10% based on the weight of the paper substrate and wherein said succinic acid derivative or salt thereof is added to a pulp slurry and fixed to the pulp with a fixer, whereafter said paper substrate is formed.
Claim 2
Dependent Claim
104 words
A pressure-sensitive recording sheet comprising a paper substrate which contains therein a succinic acid derivative having an alkenyl or alkyl group, or a salt thereof, said group containing from 4 to 18 carbon atoms and a layer containing an electron-donating color former and/or an electron-accepting color developer, wherein the succinic acid derivative or salt thereof is present in an amount within the range of 0.01 to 10% based on the weight of the paper substrate and wherein said succinic acid derivative or salt thereof is added to a pulp slurry and fixed to the pulp with a fixer, whereafter said paper substrate is formed.
Claim 3
Dependent Claim
21 words
A pressure-sensitive recording sheet as claimed in claim 1, wherein the alkenyl or alkyl group contains 8 to 14 carbon atoms.
Claim 4
Dependent Claim
19 words
A pressure-sensitive recording sheet as claimed in claim 2, wherein the alkenyl or alkyl group contains 10-12 carbon atoms.
Claim 5
Dependent Claim
33 words
A pressure-sensitive recording sheet as claimed in claim 1, wherein the salt is a salt selected from the group consisting of sodium salts, potassium salts, calcium salts and low molecular organic amine salts.
Claim 6
Dependent Claim
38 words
A pressure-sensitive recording sheet as claimed in claim 1, wherein the succinic acid derivative or salt thereof is present in an amount within the range of 0.05 to 5 percent based on the weight of the base paper.
Claim 7
Dependent Claim
38 words
A pressure-sensitive recording sheet as claimed in claim 5, wherein the succinic acid derivative or salt thereof is present in an amount within the range of 0.1 to 2 percent based on the weight of the base paper.
Claim 8
Dependent Claim
15 words
A pressure-sensitive recording sheet as claimed in claim 1, wherein said fixer is alumina sulfate.
Claim 9
Dependent Claim
23 words
A pressure-sensitive recording sheet as claimed in claim 1, wherein said succinic acid derivative or salt thereof is used in combination with polyacrylamide.
Claim 10
Dependent Claim
15 words
A pressure-sensitive recording sheet as claimed in claim 8, wherein said polyacrylamide is carboxy-modified polyacrylamide.
Claim 11
Dependent Claim
20 words
A pressure-sensitive recording sheet as claimed in claim 1, wherein said color developer is an aromatic carboxylic acid metal salt.
Claim 12
Dependent Claim
25 words
A pressure-sensitive recording sheet as claimed in claim 10, wherein said aromatic carboxylic acid has a total number of carbon atoms of at least 15.
Claim 13
Dependent Claim
26 words
A pressure-sensitive recording sheet as claimed in claim 11, wherein said metal is selected from the group consisting of aluminum, barium, tin, iron, calcium and lead.
References Cited (Backward Citations)
US3296065A
Cited
JPS55113592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |