US5229350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible heat-senitive recording material and magnetic card using the recording material
Assignee: Nitto Denko Corp
•
Filing: 1991-07-18
•
Granted: 1993-07-20
•
Expires: 2011-07-18
Abstract
Abstract A reversible heat-sensitive recording material, a method of recording and erasing information using the recording material, and a magnetic card using the recording material, the recording material comprising a reversible heat-sensitive recording material comprising a heat-sensitive layer containing a resin matrix and an organic low molecular weight material, said organic low molecular weight material containing at least one higher fatty acid having 16 or more carbon atoms and a sulfide represented by the formula HOOC(CH.sub.2).sub.m --S--(CH.sub.2).sub.n COOH [I] wherein m and n each independently means an integer of 1 to 5, the ratio of the amount of said at least one higher fatty acid to that of said sulfide being from 90:10 to 10:90 by weight.
Inventors
- 👤 Takae Shinagawa
- 👤 Yoshihiro Hieda
- 👤 Megumi Ashida
- 👤 Yoshinori Yoshida
- 👤 Yasushi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:30
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/36; B41M5/363; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/913; Y10S428/914
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
96 words
A reversible heat-sensitive recording material comprising a heat-sensitive layer formed on a support wherein said heat-sensitive layer contains a resin matrix and an organic low molecular weight material, said organic low molecular weight material containing at least one higher fatty acid having 16 or more carbon atoms and a sulfide represented by the formula HOOC(CH.sub.2).sub.m --S--(CH.sub.2).sub.n COOH [I] wherein m and n each independently represents an integer of 1 to 5, the ratio of the amount of said at least one higher fatty acid to that of said sulfide being from 90:10 to 10:90 by weight.
Claim 2
Dependent Claim
96 words
A reversible heat-sensitive recording material comprising a heat-sensitive layer formed on a support wherein said heat-sensitive layer contains a resin matrix and an organic low molecular weight material, said organic low molecular weight material containing at least one higher fatty acid having 16 or more carbon atoms and a sulfide represented by the formula HOOC(CH.sub.2).sub.m --S--(CH.sub.2).sub.n COOH [I] wherein m and n each independently represents an integer of 1 to 5, the ratio of the amount of said at least one higher fatty acid to that of said sulfide being from 90:10 to 10:90 by weight.
Claim 3
Dependent Claim
24 words
A reversible heat-sensitive recording material as claimed in claim 1, wherein said resin matrix has a glass transition point of 80° C. or more.
Claim 4
Dependent Claim
66 words
A reversible heat-sensitive recording material as claimed in claim 1, wherein said resin matrix is at least one member selected from the group consisting of poly(vinyl chloride), vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-acrylate copolymer, poly(vinylidene chloride), vinylidene chloride-vinyl chloride copolymer, poly(vinyl formal), poly(vinyl butyral), polyacrylate, polymethacrylate, acrylate-methacrylate copolymer, polystyrene, styrene-butadiene copolymer, polyacrylate, polycarbonate, polysulfone, aromatic polyamide, phenoxy resin, and cellulosic resin.
Claim 5
Dependent Claim
16 words
A reversible heat-sensitive recording material as claimed in claim 1, wherein said sulfide is (2,2'-dicarboxy)diethyl sulfide.
Claim 6
Dependent Claim
89 words
A method of recording and erasing information, which comprises heating the reversible heat-sensitive recording material as claimed in claim 1 which is in an initial milky and opaque state, thereby to allow the heated area of the heat-sensitive layer in the recording material to turn transparent and thus record information, and then heating the recording material to a temperature higher than the temperature at which the recording was conducted, thereby to allow the transparent area of the heat-sensitive layer to turn milky and opaque and thus erase the information.
Claim 7
Dependent Claim
102 words
A magnetic card obtained by forming a layer of a reversible heat-sensitive recording material on a magnetic card member, wherein said heat-sensitive recording material comprises a resin matrix and an organic low molecular weight material, said organic low molecular weight material containing at least one higher fatty acid having 16 or more carbon atoms and a sulfide represented by the formula HOOC(CH.sub.2).sub.m --S--(CH.sub.2).sub.n COOH wherein m and n each independently represents an integer of 1 to 5, the ratio of the amount of said at least one higher fatty acid to that of said sulfide being from 90:10 to 10:90 by weight.
Claim 8
Dependent Claim
102 words
A magnetic card obtained by forming a layer of a reversible heat-sensitive recording material on a magnetic card member, wherein said heat-sensitive recording material comprises a resin matrix and an organic low molecular weight material, said organic low molecular weight material containing at least one higher fatty acid having 16 or more carbon atoms and a sulfide represented by the formula HOOC(CH.sub.2).sub.m --S--(CH.sub.2).sub.n COOH wherein m and n each independently represents an integer of 1 to 5, the ratio of the amount of said at least one higher fatty acid to that of said sulfide being from 90:10 to 10:90 by weight.
Claim 9
Dependent Claim
59 words
A magnetic card as claimed in claim 6, wherein the magnetic card member includes a magnetic recording layer on one side thereof, and wherein the heat-sensitive recording material is provided on part or the whole of a surface of the magnetic card member on the magnetic recording layer side or the side opposite to the magnetic recording layer side.
Claim 10
Dependent Claim
102 words
A reversible heat-sensitive recording material comprising a heat-sensitive layer formed on a support, wherein said heat-sensitive layer contains a resin matrix and an organic low molecular weight material, said organic low molecular weight material comprising a) at least one higher fatty acid having 16 or more carbon atoms, b) a sulfide represented by the formula HOOC(CH.sub.2).sub.m --S--(CH.sub.2).sub.n COOH [I] wherein m and n each independently represents an integer of 1 to 5, and c) a heat-fusible resin, the ratio of the amount of said at least one higher fatty acid to that of said sulfide being from 90:10 to 10:90 by weight.
Claim 11
Dependent Claim
102 words
A reversible heat-sensitive recording material comprising a heat-sensitive layer formed on a support, wherein said heat-sensitive layer contains a resin matrix and an organic low molecular weight material, said organic low molecular weight material comprising a) at least one higher fatty acid having 16 or more carbon atoms, b) a sulfide represented by the formula HOOC(CH.sub.2).sub.m --S--(CH.sub.2).sub.n COOH [I] wherein m and n each independently represents an integer of 1 to 5, and c) a heat-fusible resin, the ratio of the amount of said at least one higher fatty acid to that of said sulfide being from 90:10 to 10:90 by weight.
Claim 12
Dependent Claim
24 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said resin matrix has a glass transition point of 80° C. or more.
Claim 13
Dependent Claim
66 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said resin matrix is at least one member selected from the group consisting of poly(vinyl chloride), vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-acrylate copolymer, poly(vinylidene chloride), vinylidene chloride-vinyl chloride copolymer, poly(vinyl formal), poly(vinyl butyral), polyacrylate, polymethacrylate, acrylate-methacrylate copolymer, polystyrene, styrene-butadiene copolymer, polyacrylate, polycarbonate, polysulfone, aromatic polyamide, phenoxy resin, and cellulosic resin.
Claim 14
Dependent Claim
16 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said sulfide is (2,2'-dicarboxy)diethyl sulfide.
Claim 15
Dependent Claim
23 words
A reversible heat-resistive recording material as claimed in claim 8, wherein said heat-fusible resin has a softening point of at least 40° C.
Claim 16
Dependent Claim
23 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin has a solubility parameter value of 7.0 to 9.8.
Claim 17
Dependent Claim
25 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin has a number average molecular weight of from 200 to 2,500.
Claim 18
Dependent Claim
33 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein the amount of said heat-fusible resin is 0.1 to 50 parts by weight per 100 parts by weight of the resin matrix.
Claim 19
Dependent Claim
18 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin comprises a natural resin.
Claim 20
Dependent Claim
18 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin comprises a polyterpene resin.
Claim 21
Dependent Claim
18 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin comprises a terpene resin.
Claim 22
Dependent Claim
19 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin comprises an aliphatic hydrocarbon resin.
Claim 23
Dependent Claim
19 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin comprises an aromatic petroleum resin.
Claim 24
Dependent Claim
18 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin comprises a cyclopentadiene resin.
Claim 25
Dependent Claim
18 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin comprises a phenolic resin.
Claim 26
Dependent Claim
18 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin comprises an alkylphenol-acetylene resin.
Claim 27
Dependent Claim
18 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin comprises a styrene resin.
Claim 28
Dependent Claim
18 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin comprises a xylene resin.
Claim 29
Dependent Claim
18 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin comprises a coumarone-indene resin.
Claim 30
Dependent Claim
18 words
A reversible heat-sensitive recording material as claimed in claim 8, wherein said heat-fusible resin comprises a vinyltoluene-α-methylstyrene resin.
Claim 31
Dependent Claim
107 words
A magnetic card obtained by forming a layer of a reversible heat-sensitive recording material on a magnetic sheet, wherein said heat-sensitive recording material comprises a resin matrix and an organic low molecular weight material, said organic low molecular weight material comprising a) at least one higher fatty acid having 16 or more carbon atoms, b) a sulfide represented by the formula HOOC(CH.sub.2).sub.m --S--(CH.sub.2).sub.n COOH wherein m and n each independently represents an integer of 1 to 5, and c) a heat-fusible resin, the ratio of the amount of said at least one higher fatty acid to that of said sulfide being from 90:10 to 10:90 by weight.
Claim 32
Dependent Claim
107 words
A magnetic card obtained by forming a layer of a reversible heat-sensitive recording material on a magnetic sheet, wherein said heat-sensitive recording material comprises a resin matrix and an organic low molecular weight material, said organic low molecular weight material comprising a) at least one higher fatty acid having 16 or more carbon atoms, b) a sulfide represented by the formula HOOC(CH.sub.2).sub.m --S--(CH.sub.2).sub.n COOH wherein m and n each independently represents an integer of 1 to 5, and c) a heat-fusible resin, the ratio of the amount of said at least one higher fatty acid to that of said sulfide being from 90:10 to 10:90 by weight.
References Cited (Backward Citations)
FR2538309A1
Cited
GB2135466A
Cited
DE3726015A1
Cited
US4977030A
Cited
US4917948A
Cited
DE3933487A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |