Patent US4418942A successfully refreshed from Google Patents.
US4418942A
Expired / Lapsed
US
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Microcapsule sheet for pressure-sensitive recording paper
Assignee: Fujifilm Holdings Corp
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Filing: 1981-12-29
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Granted: 1983-12-06
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Expires: 2001-12-29
Abstract
Abstract A microcapsule sheet is disclosed. At least one surface of the base paper has a coating produced from a solution that contains microcapsules each containing an electron donating color former, a binder whose solid content is from 20 to 50 parts by weight based on 100 parts by weight of the solid content of the microcapsules, a protective agent and a surfactant having a hydrophobic atomic group of the formula: ##STR1## wherein R 1 and R 2 are each an aliphatic hydrocarbon having 2 to 20 carbon atoms or aromatic hydrocarbon having 6 to 20 carbon atoms.
Inventors
- 👤 Noriyuki Hosoi
- 👤 Yoshiyuki Hoshi
- 👤 Hiroharu Matsukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:14
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/27; Y10T428/273; Y10T428/277
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
190 words
A wrinkle-free pressure-sensitive microcapsule recording paper, prepared by a process comprising the steps of providing a support base paper; coating one surface of said support base paper with a color developer-coating solution wherein said color developer-coating solution is comprised of a color developer dissolved or dispersed in a solvent selected from the group consisting or organic solvents and water; and coating the other surface of said support base paper with a microcapsule coating solution, wherein said microcapsule coating solution is comprised of microcapsules, a binder, a surfactant, and a protective agent, wherein said microcapsules contain an electron-donating color former, said binder has a solid content of 20 to 50 parts by weight per 100 parts by weight of the solid content of said microcapsules, wherein said surfactant is used in an amount such that the solid content is 0.0001 to 10 parts per 100 parts by weight of said solid content of said microcapsules and has a hydrophobic atomic group of the formula: ##STR5## wherein R 1 and R 2 are each an aliphatic hydrocarbon having 2 to 20 carbon atoms or aromatic hydrocarbon having 6 to 20 carbon atoms.
Claim 2
Dependent Claim
190 words
A wrinkle-free pressure-sensitive microcapsule recording paper, prepared by a process comprising the steps of providing a support base paper; coating one surface of said support base paper with a color developer-coating solution wherein said color developer-coating solution is comprised of a color developer dissolved or dispersed in a solvent selected from the group consisting or organic solvents and water; and coating the other surface of said support base paper with a microcapsule coating solution, wherein said microcapsule coating solution is comprised of microcapsules, a binder, a surfactant, and a protective agent, wherein said microcapsules contain an electron-donating color former, said binder has a solid content of 20 to 50 parts by weight per 100 parts by weight of the solid content of said microcapsules, wherein said surfactant is used in an amount such that the solid content is 0.0001 to 10 parts per 100 parts by weight of said solid content of said microcapsules and has a hydrophobic atomic group of the formula: ##STR5## wherein R 1 and R 2 are each an aliphatic hydrocarbon having 2 to 20 carbon atoms or aromatic hydrocarbon having 6 to 20 carbon atoms.
Claim 3
Dependent Claim
46 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 1, wherein said surfactant is used in an amount such that said solid content is 0.005 to 0.5 part by weight per 100 parts by weight of said solid content of said microcapsules.
Claim 4
Dependent Claim
51 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 1, wherein said protective agent is used in an amount such that the solid content of said protective agent is 20 to 150 parts by weight per 100 parts by weight of said solid content of said microcapsules.
Claim 5
Dependent Claim
47 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 3, wherein said protective agent is used in an amount such that said solid content is 40 to 100 parts by weight per 100 parts by weight of said solid content of said microcapsules.
Claim 6
Dependent Claim
28 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 1, wherein said base paper provided has a gas permeability of 90 seconds or less.
Claim 7
Dependent Claim
26 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 1, wherein said binder has a molecular weight of from 1,000 to 10,000,000.
Claim 8
Dependent Claim
26 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 6, wherein said binder has a molecular weight of from 10,000 to 5,000,000.
Claim 9
Dependent Claim
36 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 1, wherein said protective agent is a particulate protective agent having a volume average size within the range of 3 to 50 microns.
Claim 10
Dependent Claim
33 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 8, wherein said volume average size of said particulate protective agent is within the range of 5 to 40 microns.
Claim 11
Dependent Claim
34 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 1, wherein said protective agent is a fibrous protective agent having a length within the range of 50 to 600 microns.
Claim 12
Dependent Claim
30 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 10, wherein said fibrous protective agent has a length within the range of 100 to 400 microns.
Claim 13
Dependent Claim
34 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 1, wherein said coating solution is applied to said base paper in a dry weight of 2 g/m 2 or more.
Claim 14
Dependent Claim
38 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 2, wherein said coating solution is applied to said base paper in a dry weight within the range of 3.5 to 6 g/m 2 .
Claim 15
Dependent Claim
33 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 1, wherein said color former is contained in an amount within the range of 0.03 to 0.5 g/m 2 .
Claim 16
Dependent Claim
28 words
A pressure-sensitive microcapsule recording paper, formed by the steps as claimed within claim 1, wherein said microcapsules have a size within the range of 3 to 20 microns.
References Cited (Backward Citations)
US4165398A
Cited
US4269893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |