US4411451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensitive copying paper
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1981-08-12
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Granted: 1983-10-25
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Expires: 2001-08-12
Abstract
Abstract In a pressure sensitive copying paper comprising a color former coated sheet obtainable by coating an aqueous coating color constituted mainly of microcapsules containing a substantially colorless color former and of a protecting agent and a binder, the transferability of the color former onto the color developer coated sheet can be improved by adding a wax to said aqueous coating color in an amount of 3-15% by weight based on the solid content of the coating color.
Inventors
- 👤 Toshihiko Matsushita
- 👤 Sadao Morishita
- 👤 Eiko Kamimura
- 👤 Shigetoshi Hiraishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:41
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; Y; Y10; Y10S; Y10S428/00; Y10S428/914
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
A pressure sensitive copying paper comprising a color developer coated sheet obtained by coating a color developer on a support and a color former coated sheet obtained by coating on another support an aqueous coating color constituted mainly of (i) microcapsules containing a substantially colorless color former, (ii) a microcapsule-protecting agent and (iii) a binder selected from the group consisting of hydrophilic polymer colloids, starch, oxidized starch, casein, polyvinyl alcohol, carboxymethyl cellulose, water-soluble or dispersable gums and latexes and drying the coated aqueous coating color, wherein a wax in the form of an aqueous emulsion or aqueous suspension is added to said aqueous coating color in an amount of 3-15% by weight based on the solid content of the coating color.
Claim 2
Dependent Claim
121 words
A pressure sensitive copying paper comprising a color developer coated sheet obtained by coating a color developer on a support and a color former coated sheet obtained by coating on another support an aqueous coating color constituted mainly of (i) microcapsules containing a substantially colorless color former, (ii) a microcapsule-protecting agent and (iii) a binder selected from the group consisting of hydrophilic polymer colloids, starch, oxidized starch, casein, polyvinyl alcohol, carboxymethyl cellulose, water-soluble or dispersable gums and latexes and drying the coated aqueous coating color, wherein a wax in the form of an aqueous emulsion or aqueous suspension is added to said aqueous coating color in an amount of 3-15% by weight based on the solid content of the coating color.
Claim 3
Dependent Claim
21 words
A pressure sensitive copying paper according to claim 1, wherein said wax is added in an amount of 4-10% by weight.
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) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |