US4598035A
Expired / Lapsed
US
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Heat-sensitive recording material containing microcapsules containing coloring component(s) and organic solvent
Assignee: Fujifilm Holdings Corp
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Filing: 1985-03-26
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Granted: 1986-07-01
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Expires: 2005-03-26
Abstract
Abstract A heat-sensitive recording material, comprising a support having thereon a layer containing microcapsules containing at least a first component capable of causing a coloring reaction as a core material, and, outside of the microcapsules, at least a second component causing said coloring reaction with said first component in the microcapsules, wherein the microcapsules contain an organic solvent in the cores thereof, the average particle size of the microcapsules is 8 microns or less, and the value of (number average wall thickness δ (in microns)/volume average particle size D (in microns)) of the microcapsules is 1×10 -2 or more. The coloring components that may be used in the core include leuco dyes and diazo compounds. The organic solvents have a boiling of 180° C. or more. The heat-sensitive recording material has excellent pressure are friction resistance, a high heat coloring property and an excellent production aptitude.
Inventors
- 👤 Toshimasa Usami
- 👤 Toshiharu Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:18
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/28; B41M5/287
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
96 words
A heat-sensitive recording material comprising a support having thereon a layer containing microcapsules containing at least a first component capable of causing a coloring reaction as a core material, and at least a second component causing said coloring reaction with said first component in the microcapsules, wherein the microcapsules contain an organic solvent in the cores thereof, the average particle size of the microcapsules is 0.1 to 8 microns, and the value of (number average wall thickness δ (in microns)/volume average particle size D (in microns)) of the microcapsules is 1×10 -2 to 5×10 -1 .
Claim 2
Dependent Claim
96 words
A heat-sensitive recording material comprising a support having thereon a layer containing microcapsules containing at least a first component capable of causing a coloring reaction as a core material, and at least a second component causing said coloring reaction with said first component in the microcapsules, wherein the microcapsules contain an organic solvent in the cores thereof, the average particle size of the microcapsules is 0.1 to 8 microns, and the value of (number average wall thickness δ (in microns)/volume average particle size D (in microns)) of the microcapsules is 1×10 -2 to 5×10 -1 .
Claim 3
Dependent Claim
21 words
A heat-sensitive recording material as in claim 1, wherein the organic solvent has a boiling point of higher than 180° C.
Claim 4
Dependent Claim
22 words
A heat-sensitive recording material as in claim 2, wherein the organic solvent is a phosphoric acid ester or a phthalic acid ester.
Claim 5
Dependent Claim
37 words
A heat-sensitive recording material as in claim 2, wherein the organic solvent is an aromatic carboxylic acid ester, a fatty acid ester, an alkylated biphenyl, an alkylated terphenyl, a chlorinated paraffin, an alkylated naphthalene, or a diarylethane.
Claim 6
Dependent Claim
34 words
A heat-sensitive recording material as in claim 1, wherein said first coloring component contained in the microcapsules is a leuco dye, and said second coloring component is a developer for coloring the deuco dye.
Claim 7
Dependent Claim
38 words
A heat-sensitive recording material as in claim 1, wherein said first coloring component contained in the microcapsules is a diazo compound, and said second coloring component is a coupling agent causing a coupling reaction with said diazo compound.
Claim 8
Dependent Claim
49 words
A heat-sensitive recording material as in claim 5, wherein the developer is phenol compound an organic sulfonic acid, a metal salt of an organic sulfonic acid, an organic carboxylic acid, a metal salt of an organic carboxylic acid, ethyl p-oxybenzoate, butyl p-oxybenzoatee, heptyl p-oxybenzoate, benzyl p-oxybenzoate or a clay.
Claim 9
Dependent Claim
45 words
A heat-sensitive recording material as in claim 6, wherein the diazo compound is a diazonium salt represented by the formula ArN.sub.2.sup.+ X.sup.- wherein Ar represents a substituted or unsubstituted aromatic moiety; N 2 - represents a diazonium salt; and X - represents an acid anion.
Claim 10
Dependent Claim
15 words
A heat-sensitive recording material as in claim 6, wherein the coloring aid is further contained.
Claim 11
Dependent Claim
50 words
A heat-sensitive recording material as in claim 9 wherein the coloring aid is urea, thiourea, a derivative of urea or thiourea, a thiozole, a pyrrole, a pyromidine, a piperazine, a guanidine, an indole, an imidazole, an imidazoline, a triazole, a morpholine, a piperdine, an amidine, a formamidine, or a pyridine.
Claim 12
Dependent Claim
32 words
A heat-sensitive recording material as in claim 1, wherein the value of (number average wall thickness δ(in microns)/volume average particle size D (in microns)) of the microcapsules is above 2×10 -2 .
Claim 13
Dependent Claim
32 words
A heat-sensitive recording material as in claim 5, wherein the value of (number average wall thickness δ(in microns)/volume average particle size D (in microns)) of the microcapsules is above 2×10 -2 .
Claim 14
Dependent Claim
32 words
A heat-sensitive recording material as in claim 6, wherein the value of (number average wall thickness δ(in microns)/volume average particle size D (in microns)) of the microcapsules is above 2×10 -2 .
Claim 15
Dependent Claim
25 words
A heat-sensitive recording material as in claim 7, wherein the developer is a phenol compound having a melting point of from 60° to 200° C.
Claim 16
Dependent Claim
41 words
A heat-sensitive recording material as in claim 5, wherein the leuco dye is used in an amount of from 0.05 to 0.4 g/m 2 , and the developer is used in an amount of from 0.5 to 4 g/m 2 .
Claim 17
Dependent Claim
50 words
A heat-sensitive recording material as in claim 6, wherein the diazo compound is used in an amount of from 0.05 to 2.0 g/m 2 , and the coupling agent is used in an amount of from 0.1 to 10 parts by weight per part by weight of the diazo compound.
Claim 18
Dependent Claim
73 words
A heat-sensitive recording material as in claim 9, wherein the diazo compound is used in an amount of from 0.05 to 2.0 g/m 2 , the coupling agent is used in an amount of from 0.1 to 10 parts by weight per part by weight of diazo compound, and the coloring aid is used in an amount of from 0.1 to 20 parts by weight per part by weight of the diazo compound.
Claim 19
Dependent Claim
29 words
A heat-sensitive recording material as in claim 5, wherein the leuco dye has a partial skeleton capable of causing ring opening or cleavage by the contact with a developer.
Claim 20
Dependent Claim
19 words
A heat-sensitive recording material as in claim 5, wherein said second coloring component is present outside of the microcapsules.
Claim 21
Dependent Claim
19 words
A heat-sensitive recording material as in claim 6, wherein said second coloring component is present outside of the microcapsules.
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) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |