Patent US1978750A successfully refreshed from Google Patents.
US4749680A
Expired / Lapsed
US
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Color-developing agent for pressure-sensitive recording sheet and color-developing sheet therefor
Assignee: Nippon Paper Industries Co Ltd
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Filing: 1986-06-09
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Granted: 1988-06-07
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Expires: 2006-06-09
Abstract
Abstract The color-developing agent for pressure-sensitive recording sheet comprises the polyvalent-metal salt of carboxylated terpenephenol resin. The color-developing sheet containing the above color-developing agent provides excellent yellowing-resistance, superior color-developing ability and improved fastness of the colored image.
Inventors
- 👤 Hiroaki Umeda
- 👤 Mamoru Suzuki
- 👤 Akira Hasegawa
- 👤 Kunio Hata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:04
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/155
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
57 words
A color-developing sheet for pressure sensitive recording sheet which comprises a color-developing layer on a support, said color developing layer comprising a polyvalent metal salt of carboxylated terpenephenol resin produced by condensating cyclicmonoterpene and phenol in presence of acidic catalyst, introducing carboxyl group into the condensated product and causing the reaction of the product with polyvalent metal.
Claim 2
Dependent Claim
57 words
A color-developing sheet for pressure sensitive recording sheet which comprises a color-developing layer on a support, said color developing layer comprising a polyvalent metal salt of carboxylated terpenephenol resin produced by condensating cyclicmonoterpene and phenol in presence of acidic catalyst, introducing carboxyl group into the condensated product and causing the reaction of the product with polyvalent metal.
Claim 3
Dependent Claim
13 words
The color-developing sheet according to claim 1, wherein said polyvalent metal is zinc.
Claim 4
Dependent Claim
26 words
A color-developing agent according to claim 1, wherein the phenol in said terpenephenol resin is used in amount of 0.1-10 mole per mole of the terpene.
Claim 5
Dependent Claim
23 words
A color-developing agent according to claim 3, wherein said phenol is used in an amount of 0.4-5 mole per mole of said terpene.
Claim 6
Dependent Claim
27 words
A color-developing agent according to claim 1, wherein said terpenephenol resin has an average molecular weight of 350-1000 and a softening point of at least 70° C.
Claim 7
Dependent Claim
30 words
A color-developing sheet according to claim 1, wherein the polyvalent metal salt of carboxylated terpenephenol resin is contained in a range of 10-70 wt. %, based on said color-developing layer.
Claim 8
Dependent Claim
19 words
A color-developing sheet according to claim 1, wherein the weight of said color-developing layer is 1.0-10.0 g/m 2 .
Claim 9
Dependent Claim
19 words
A color-developing agent according to claim 1, wherein said color-developing agent is used in combination with crystal violet lactone.
References Cited (Backward Citations)
US4540998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |