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US4447487A
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Heat-sensitive recording papers
Assignee: Fujifilm Holdings Corp
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Filing: 1982-10-22
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Granted: 1984-05-08
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Expires: 2002-10-22
Abstract
Abstract A heat-sensitive recording paper is disclosed. The paper is comprised of a support base which is made of a paper having a density 0.9 g/cm 3 or less and a heat-sensitive recording layer coated on the support base. The surface of the heat-sensitive recording layer has an optical contact ratio of 7% or more. By utilizing the particularly disclosed support base paper and adjusting the optical contact ratio of the surface of the heat-sensitive recording layer, the resulting recording paper can give high heat conductivity between the surface of the recording layer and a recording element. Accordingly, the recording paper has a fast response speed and can produce a high density image without disadvantages such as increased fog formation.
Inventors
- 👤 Masakazu Maekawa
- 👤 Hiroharu Matsukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:25
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/41; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249962; Y10T428/31504; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
48 words
A heat-sensitive recording paper, comprising: a support base comprised of paper having a density of 0.9 g/cm 3 or less; and a heat-sensitive recording layer coated on a surface of the support base, the surface of the coated layer being having an optical contact ratio 7% or more.
Claim 2
Dependent Claim
48 words
A heat-sensitive recording paper, comprising: a support base comprised of paper having a density of 0.9 g/cm 3 or less; and a heat-sensitive recording layer coated on a surface of the support base, the surface of the coated layer being having an optical contact ratio 7% or more.
Claim 3
Dependent Claim
29 words
A heat-sensitive recording paper as claimed in claim 1, wherein the optical contact ratio of the surface of the coated layer is in the range of 10% to 30%.
Claim 4
Dependent Claim
31 words
A heat-sensitive recording paper as claimed in any of claims 1 or 2, wherein the support base is comprised of a paper having a density of 0.85 g/cm 3 or less.
Claim 5
Dependent Claim
30 words
A heat-sensitive recording paper as claimed in claim 3, wherein the support base is comprised of paper having a density within the range of 0.80 to 0.70 g/cm 3 .
Claim 6
Dependent Claim
44 words
A heat-sensitive recording paper as claimed in claim 1, wherein the support base is produced by drying a wet web having a water content of 50 to 70% to a water content of 15% or less by pressing the paper onto the Yankee dryer.
Claim 7
Dependent Claim
19 words
A heat-sensitive recording paper as claimed in claim 1, wherein the support base has a void content above 40%.
Claim 8
Dependent Claim
31 words
A heat-sensitive recording paper as claimed in claim 1, wherein the support base is incorporated with a sizing agent and has a sizing degree of 15 to 25 g/m 2 .
Claim 9
Dependent Claim
41 words
A heat-sensitive recording paper as claimed in claim 1, wherein the heat-sensitive recording layer includes a color developer and a color former and wherein the color former is present in an amount of 0.2 g/m 2 to 1.0 g/m 2 .
References Cited (Backward Citations)
US4032690A
Cited
US4098114A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |