Patent EP0123224A2 successfully refreshed from Google Patents.
EP0123224A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Heat sensitive recording materials
Assignee: Fujifilm Holdings Corp
•
Filing: 1984-04-12
•
Granted: —
•
Expires: 2004-04-12
Abstract
Abstract A heat sensitive recording material comprising a support and a recording layer formed thereon, the recording layer containing (a) a diazo compound, (b) a coupling component and (c) a coloring activator, as the three main components, at least one of the three components (a) to (c) being present in microcapsules and the wall of the microcapsules being composed of a polymer formed around the material encapsulated by a polymerization of reactants. By incorporating a part of the main components in microcapsules, the shelf life of the heat sensitive recording material is greatly improved and when the wall of the microcapsules is formed by the polymerization of reactants around the material encapsulated, the reactive component in the microcapsules immediately passes through the capsule wall upon heating to cause coloration.
Inventors
- 👤 Toshimasa Usami
- 👤 Toshiharu Tanaka
- 👤 Fumiaki Shinozaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 08:00
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/002
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
91 words
A heat sensitive recording material comprising a support having thereon a recording layer containing (a) a diazo compound, (b) a coupling component and (c) a coloring activator, wherein at least one of said diazo compound, said coupling component and said coloring activator is present in microcapsules as the core material with the proviso that all three components (a) to (c) are not present in the same microcapsules, the wall of said microcapsules being formed around the material encapsulated by polymerization of a reactant or reactants after dispersing the core material therein.
Claim 2
Dependent Claim
91 words
A heat sensitive recording material comprising a support having thereon a recording layer containing (a) a diazo compound, (b) a coupling component and (c) a coloring activator, wherein at least one of said diazo compound, said coupling component and said coloring activator is present in microcapsules as the core material with the proviso that all three components (a) to (c) are not present in the same microcapsules, the wall of said microcapsules being formed around the material encapsulated by polymerization of a reactant or reactants after dispersing the core material therein.
Claim 3
Dependent Claim
24 words
.The heat sensitive recording material as claimed in claim 1, wherein the wall of the microcapsules is composed of polyurethane, polyurea, polyamide or polyester.
Claim 4
Dependent Claim
85 words
The heat sensitive recording material as claimed in claim 1, wherein one of the three components (a) to (c) is present in microcapsules and the component present in the microcapsules is the diazo compound (a) and the wall of the microcapsules is composed of a polymer formed around the material encapsulated by polymerization of at least one polyhydric isocyanate as a first wall-forming material and at least one polyol as a second wall-forming material capable of forming a polymer by reaction with the polyhydric isocyanate.
Claim 5
Dependent Claim
23 words
The heat sensitive recording material as claimed in claim 1, wherein two of the three components (a) to (c) are present in microcapsules.
Claim 6
Dependent Claim
20 words
The heat sensitive recording material as claimed in claim 5, wherein said two components are present in the same microcapsules.
Claim 7
Dependent Claim
19 words
The heat sensitive recording material as claimed in claim 5, wherein said two components are present in different microcapsules.
Claim 8
Dependent Claim
24 words
The heat sensitive recording material as claimed in claim 1, wherein each of said three components (a) to (c) is present in different microcapsules.
Claim 9
Dependent Claim
38 words
The heat sensitive recording material as claimed in claim 1, wherein said three components (a) to (c) are present in microcapsules, two components being present in the same microcapsules and the other component being present in other microcapsules.
Claim 10
Dependent Claim
23 words
The heat sensitive recording material as claimed in claim 1, wherein the material encapsulated is present in microcapsules together with an organic solvent.
Claim 11
Dependent Claim
27 words
The heat sensitive recording material as claimed in claim 9, wherein said organic solvent is a water-insoluble high-boiling solvent having a boiling point.higher than 180° C .
Claim 12
Dependent Claim
43 words
The heat sensitive recording material as claimed in claim 10, wherein said organic solvent is a phosphoric acid ester, a phthalic acid ester, a carboxylic acid ester, a fatty acid amide, an alkylated biphenyl, an alkylated terphenyl, a chlorinated paraffin, or a diarylethane.
Claim 13
Dependent Claim
44 words
The heat sensitive recording material as claimed in claim 1, wherein the diazo compound is represented by the general formula wherein Ar represents a substituted aromatic moiety and X-represents an acid anion containing a perfluoroalkyl group or an acid anion containing a perfluoroalkenyl group.
Claim 14
Dependent Claim
91 words
The heat sensitive recording material as claimed in claim 3, wherein the polyol is selected from the polyols having the following groups (I),(II),(III) or (IV) between the two hydroxy groups in the molecular structure; (I) aliphatic hydrocarbon group having 2 to 8 carbon atoms wherein Ar in groups(II),(III) and (IV) represents an unsubstituted or substituted aromatic moiety and the aliphatic hydrocarbon group of (I) has the moiety -C n H 2n -(wherein n is 2 to 8) as the fundamental skeleton and the hydrogen atom may be replaced by another element.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.