US4749679A
Expired / Lapsed
US
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Heat sensitive recording materials
Assignee: Fujifilm Holdings Corp
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Filing: 1986-06-04
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Granted: 1988-06-07
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Expires: 2006-06-04
Abstract
Abstract This invention discloses a heat sensitive recording material having a heat sensitive layer on a support; either of a color forming material or a developer which are contained in the heat sensitive layer is encased in a microcapsule. Since a plasticizer for a wall material of the microcapsule and a compound having an effect to depress the melting point of at least one member out of developers, a color forming reaction is carried out smoothly under a recording condition, therefore, a density of an obtained image is sufficient. Especially good results are obtained when a macromolecule substance selected from a group of polyurethane, polyurea, polyamide, polyester and polycarbonate is used as a wall material of the microcapsule. A coloring reaction assistant may be contained in any place of the heat sensitive layer. A preferable plasticizer can be selected from a group of phenols, alcohols, ureas, sulfonamides, carbamates and aromatic methoxy compounds.
Inventors
- 👤 Shohei Yoshida
- 👤 Toshiaki Endo
- 👤 Sumitaka Tatsuta
- 👤 Toshimasa Usami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:14
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3375; B41M5/28; B41M5/287; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2987
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
83 words
A heat sensitive recording material produced by providing on a support a heat sensitive layer of microcapsules containing either at least one color former or at least one developer which develops a coloring reaction upon heating, wherein said heat sensitive layer contains a plasticizer for the wall of the microcapsules and a compound having an effect to depress the melting point of said at least one developer which develops the coloring reaction, wherein the plasticizer and melting point depressant are two different compounds.
Claim 2
Dependent Claim
83 words
A heat sensitive recording material produced by providing on a support a heat sensitive layer of microcapsules containing either at least one color former or at least one developer which develops a coloring reaction upon heating, wherein said heat sensitive layer contains a plasticizer for the wall of the microcapsules and a compound having an effect to depress the melting point of said at least one developer which develops the coloring reaction, wherein the plasticizer and melting point depressant are two different compounds.
Claim 3
Dependent Claim
18 words
The heat sensitive recording materials claimed in claim 1, wherein said color former is contained in the micocapsules.
Claim 4
Dependent Claim
32 words
Heat sensitive recording materials as claimed in claim 2, wherein the wall material of the microcapsules is a macromolecular substance selected from the group consiting of polyurethane, polyurea, polyamide, polyester and polycarbonate.
Claim 5
Dependent Claim
32 words
The heat sensitive recording materials claimed in claim 1, wherein the wall material of the microcapsules is a macromolecule substance selected from a group consisting of polyurethane, polyurea, polyamide, polyester and polycarbonate.
Claim 6
Dependent Claim
20 words
The heat sensitive recording materials claimed in claim 4, wherein the wall material of the microcapsules is polyurethane or polyurea.
Claim 7
Dependent Claim
34 words
The heat sensitive recording materials claimed in claim 1, wherein said plasticizer is at least one member selected from the compounds which reduce the glass transition point of said wall material to 80°-150° C.
Claim 8
Dependent Claim
32 words
The heat sensitive recording materials claimed in claim 6, wherein said plasticizer is at least one member selected form a group consisting of phenols, alcohols, ureas, sulfonamides, carbamates and aromatic methoxy compounds.
Claim 9
Dependent Claim
22 words
The heat sensitive recording materials claimed in claim 7, wherein said plasticizer is at least one member selected from phenols or sulfonamides.
Claim 10
Dependent Claim
37 words
The heat sensitive recording materials claimed in claim 8, wherein said phenols is at least one member selected from that expressed by the following general formula ##STR9## wherein, R represents a hydrogen atom or an alkyl group.
Claim 11
Dependent Claim
16 words
The heat sensitive recording materials claimed in claim 9, wherein said R represents a hydrogen atom.
Claim 12
Dependent Claim
37 words
The heat sensitive recording materials claimed in claim 8, wherein said sulfonamide is at least one member selected from that expressed by the following general formula ##STR10## wherein, R represents a hydrogen atom or an alkyl group.
Claim 13
Dependent Claim
15 words
The heat sensitive recording materials claimed in claim 11, wherein said R represents methyl group.
Claim 14
Dependent Claim
42 words
The heat sensitive recording materials claimed in claim 1 wherein said plasticizer is used inside the microcapsules or in the wall material thereof in an amount of 0.01 to 5.0 parts by weight per one part by weight of said wall material.
Claim 15
Dependent Claim
36 words
The heat sensitive recording materials claimed in claim 1 wherein said plasticizer is used outside the microcapsules in an amount of 0.01 to 10 parts by weight per one part by weight of said wall material.
Claim 16
Dependent Claim
39 words
The heat sensitive recording materials claimed in claim 1 wherein said melting point depressant is contained in the same place as said developer in an amount of 0.1-2 parts by weight per one part by weight of said developer.
Claim 17
Dependent Claim
159 words
Heat sensitive recording materials produced by providing on a support an heat sensitive layer in which three components comprising of at least one color former, one developer and one coloring reaction assistant cooperate to develop a coloring reaction, wherein said heat sensitive layer includes microcapsules containing at leat one component selected from said three components relating to the coloring reaction, or containing either a combination of the color former and the coloring reaction assistant or a combination of the developer and the coloring reaction assistant; also includes a plasticizer for the wall material of the microcapsules and a compound which has an effect of reducing the melting point of at least one of the developers or the coloring reaction assistants relating to the coloring reaction, at least in one of the three places selected from the inside and the outside of the microcapsules and the wall material thereof, wherein the plasticizer and melting point depressant are two different compounds.
Claim 18
Dependent Claim
159 words
Heat sensitive recording materials produced by providing on a support an heat sensitive layer in which three components comprising of at least one color former, one developer and one coloring reaction assistant cooperate to develop a coloring reaction, wherein said heat sensitive layer includes microcapsules containing at leat one component selected from said three components relating to the coloring reaction, or containing either a combination of the color former and the coloring reaction assistant or a combination of the developer and the coloring reaction assistant; also includes a plasticizer for the wall material of the microcapsules and a compound which has an effect of reducing the melting point of at least one of the developers or the coloring reaction assistants relating to the coloring reaction, at least in one of the three places selected from the inside and the outside of the microcapsules and the wall material thereof, wherein the plasticizer and melting point depressant are two different compounds.
Claim 19
Dependent Claim
18 words
The heat sensitive recording materials claimed in claim 16, wherein said color former is contained in the microcapsules.
Claim 20
Dependent Claim
34 words
The heat sensitive recording materials claimed in claim 16 or claim 17, wherein said wall material of the microcapsules is a macromolecular substance selected from a group of polyurethane, polyurea, polyamide, polyester and polycarbonate.
Claim 21
Dependent Claim
20 words
The heat sensitive recording materials claimed in claim 18, wherein said wall material of the microcapsules is polyurethane or polyurea.
Claim 22
Dependent Claim
32 words
The heat sensitive recording materials claimed in claim 16, wherein said plasticizer is at least one of the compounds which reduce the glass transition point of said wall material to 80°-150° C.
Claim 23
Dependent Claim
32 words
The heat sensitive recording materials claimed in claim 20, wherein said plasticizer is at least one member selected from a group consisting of phenols, alcohols, ureas, sulfonamides, carbamates and aromatic methoxy compounds.
Claim 24
Dependent Claim
22 words
The heat sensitive recording materials claimed in claim 21, wherein said plasticizer is at least one member selected from phenols or sulfonamides.
Claim 25
Dependent Claim
37 words
The heat sensitive recording materials claimed in claim 22, wherein said phenols is at least one member selected from that expressed by the following general formula: ##STR11## where R represents a hydrogen atom or an alkyl group.
Claim 26
Dependent Claim
16 words
The heat sensitive recording materials claimed in claim 23, wherein said R represents a hydrogen atom.
Claim 27
Dependent Claim
37 words
The heat sensitive recording materials claimed in claim 22, wherein said sulfonamide is at least one member selected from that expressed by the following general formula: ##STR12## wherein R represents a hydrogen atom or an alkyl group.
Claim 28
Dependent Claim
15 words
The heat sensitive recording materials claimed in claim 25, wherein said R represents methyl group.
References Cited (Backward Citations)
US4644376A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |