US4461495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive copying paper
Assignee: MITSUSHI PAPER MILLS Ltd A CORP OF JPX
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Filing: 1982-07-08
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Granted: 1984-07-24
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Expires: 2002-07-08
Abstract
Abstract A condensate free from stickiness and exhibiting an excellent initial color-formability when used as color developer of pressure sensitive copying paper can be obtained by reacting p-hydroxybenzoic acid and one p-alkyl-substituted phenol or a mixture of two or more p-alkyl-substituted phenols with formaldehyde in the presence of an acid catalyst and then directly taking out the condensate into cold water without any procedure such as dehydration, concentration, etc.
Inventors
- 👤 Yukiya Nakasato
- 👤 Atsuo Kuramoto
- 👤 Sadao Morishita
- 👤 Shigetoshi Hiraishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:02
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
74 words
A pressure sensitive copying paper wherein a layer of a color developer capable of reacting with a color former to form a color image is coated on a support, characterized in that said color developer comprises a mixture or reaction product of a polyvalent metal compound and a condensate obtained by reacting p-hydroxybenzoic acid and a p-alkylphenol having a C 1 -C 12 alkyl group with formaldehyde in the presence of an acid catalyst.
Claim 2
Dependent Claim
74 words
A pressure sensitive copying paper wherein a layer of a color developer capable of reacting with a color former to form a color image is coated on a support, characterized in that said color developer comprises a mixture or reaction product of a polyvalent metal compound and a condensate obtained by reacting p-hydroxybenzoic acid and a p-alkylphenol having a C 1 -C 12 alkyl group with formaldehyde in the presence of an acid catalyst.
Claim 3
Dependent Claim
16 words
A pressure sensitive copying paper according to claim 1, wherein the color developer includes a clay.
Claim 4
Dependent Claim
21 words
A pressure sensitive copying paper according to claim 1, wherein the alkyl substituent in said p-alkyl phenol has 4-12 carbon atoms.
Claim 5
Dependent Claim
17 words
A pressure sensitive copying paper according to claim 1, wherein said p-alkyl phenol is p-tert-octylphenol or p-tert-butylphenol.
Claim 6
Dependent Claim
14 words
A pressure sensitive copying paper according to claim 4 wherein said p-alkylphenol is p-tert-octylphenol.
Claim 7
Dependent Claim
14 words
A pressure sensitive copying paper according to claim 4 wherein said p-alkylphenol is p-tert-butylphenol.
Claim 8
Dependent Claim
21 words
A pressure sensitive copying paper according to claim 1, wherein the molar ratio of p-hydroxybenzoic acid to p-alkyl-substituted phenol is 0.1-5.
Claim 9
Dependent Claim
21 words
A pressure sensitive copying paper according to claim 7 wherein the molar ratio of p-hydroxybenzoic acid to p-alkyl-substituted phenol is 0.5-3.
Claim 10
Dependent Claim
14 words
A pressure sensitive copying paper according to claim 8 wherein said ratio is 0.5-2.
Claim 11
Dependent Claim
15 words
A pressure sensitive copying paper according to claim 1, wherein the molar ratio formaldehyde/is 0.4-1.
Claim 12
Dependent Claim
14 words
A pressure sensitive copying paper according to claim 10 wherein said ratio is 0.6-0.8.
Claim 13
Dependent Claim
65 words
A pressure sensitive copying paper according to claim 1, wherein the polyvalent metal constituting said polyvalent metal compound to be reacted with said condensate is selected from the group consisting of zinc, aluminum, titanium, nickel, cobalt, magnesium and calcium and said polyvalent metal compound is selected from the group consisting of oxides, hydroxides, carbonates, basic carbonates, phosphates, silicates and sulfates of the above-mentioned polyvalent metals.
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) | 1987-07-24 | 1988-01-23 | 1988-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-24 | 1992-01-23 | 1992-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-24 | 1996-01-23 | 1996-07-24 | $7700.00 | Window Closed / Lapsed |