Patent US4487826A successfully refreshed from Google Patents.
US4487826A
Expired / Lapsed
US
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Diazotype heat development recording medium with hydrophobic salt of alkyl substituted guanidine
Assignee: Toppan Inc
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Filing: 1983-01-17
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Granted: 1984-12-11
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Expires: 2003-01-17
Abstract
Abstract A diazotype heat development recording medium of the present invention has excellent shelf life and heat sensitivity. The medium comprises a support and a recording layer which is formed on said support and which comprises a diazo compound, a coupler, an acid stabilizer, a thermal developer, and a polymeric binder. The thermal developer is a salt of an organic or inorganic acid having a primary dissociation constant of 2x10-1 to 1x10-4 and an alkyl-substituted guanidine represented by the general formula: <IMAGE> (wherein at least one of R1 and R2 is an alkyl group of C8 to C24, and the other of R1 and R2 is a hydrogen atom or an alkyl group of C1 or more).
Inventors
- 👤 Niro Watanabe
- 👤 Shiro Nemoto
- 👤 Hiroyuki Yasujima
- 👤 Kaneki Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:49
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/61
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
112 words
A diazotype heat development recording medium, comprising a support and a recording layer which is formed on said support and which comprises a diazonium compound, a coupler, an acid stabilizer, a thermal developer, and a polymeric binder, wherein the thermal developer is a hydrophobic salt of an organic or inorganic acid having a primary dissociation constant of 2×10 -1 to 1×10 -4 with an alkyl substituted guanidine represented by a general formula: ##STR12## (wherein at least one of R1 and R2 is an alkyl group of C 8 to C 24 , and the other of R1 and R2 is a hydrogen atom or an alkyl group of C 1 or more).
Claim 2
Dependent Claim
112 words
A diazotype heat development recording medium, comprising a support and a recording layer which is formed on said support and which comprises a diazonium compound, a coupler, an acid stabilizer, a thermal developer, and a polymeric binder, wherein the thermal developer is a hydrophobic salt of an organic or inorganic acid having a primary dissociation constant of 2×10 -1 to 1×10 -4 with an alkyl substituted guanidine represented by a general formula: ##STR12## (wherein at least one of R1 and R2 is an alkyl group of C 8 to C 24 , and the other of R1 and R2 is a hydrogen atom or an alkyl group of C 1 or more).
Claim 3
Dependent Claim
19 words
A diazotype heat development recording medium according to claim 1, wherein the diazo compound is a hydrophobic diazo complex.
Claim 4
Dependent Claim
27 words
A diazotype heat development recording medium according to claim 1, wherein the coupler is a hydrophobic aromatic hydroxy compound having a sulfamoyl group in a molecule thereof.
Claim 5
Dependent Claim
27 words
A diazotype heat development recording medium according to claim 1, wherein the coupler is a hydrophobic aromatic hydroxy compound having a carbamoyl group in a molecule thereof.
Claim 6
Dependent Claim
27 words
A diazotype heat development recording medium according to claim 1, wherein the coupler is a hydrophobic aromatic hydroxy compound having a carboxyl group in a molecule thereof.
Claim 7
Dependent Claim
28 words
A diazotype heat development recording medium according to claim 1, wherein the polymeric binder is a thermoplastic resin having a glass transition point of 60° to 130° C.
Claim 8
Dependent Claim
84 words
A diazotype heat development recording medium according to claim 1, wherein the organic or inorganic acid forming a salt with the guanidine is benezenesulfonic acid, trichloroacetic acid, oxalic acid, glycerophosphoric acid, maleic acid, phosphoric acid, citric acid, malonic acid, tartaric acid, malic acid or lactic acid and the alkyl-substituted guanidine is octyl guanidine, nonyl guanidine, decyl guanidine, undecyl guanidine, lauryl guanidine, tridecyl guanidine, myristyl guanidine, hexadecyl guanidine, octadecyl guanidine, eicosyl guanidine, docosyl guanidine, dioctyl guanidine, dioctadecyl guanidine, N-methyl-N-octadecyl guanidine, N-methyl-N-decyl guanidine, or N,N-didecyl guanidine.
Claim 9
Dependent Claim
22 words
A diazotype heat development recording medium according to claim 1, wherein the alkyl-substituent on the guanidine is a straight chain alkyl group.
Claim 10
Dependent Claim
18 words
A diazotype heat development recording medium according to claim 1, wherein the thermal developer is di-(n-decyl guanidine) tartarate.
Claim 11
Dependent Claim
18 words
A diazotype heat development recording medium according to claim 1, wherein the thermal developer salt is di-(myristyl guanidine)oxalate.
Claim 12
Dependent Claim
18 words
A diazotype heat development recording medium according to claim 1, wherein the thermal developer salt is di-(n-octadecyl guanidine)oxalate.
Claim 13
Dependent Claim
18 words
A diazotype heat development recording medium according to claim 1, wherein the thermal developer salt is di-(octadecyl guanidine)citrate.
References Cited (Backward Citations)
US3416924A
Cited
GB1128762A
Cited
US3493374A
Cited
US3642483A
Cited
US3769013A
Cited
JPS5125727A
Cited
US4400456A
Cited
US4387150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |