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US3615537A Expired / Lapsed US ⏱️ 0.0 years remaining

Heat-developable diazotype material

Assignee: Van der Grinten NV
•
Filing: 1967-11-24
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Granted: 1971-10-26
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Expires: 1987-11-24
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Abstract

Abstract Diazo-type material readily developable by heat, having good keeping quality, and producible economically by aqueous coating techniques, comprises a light-sensitive layer containing, with a diazo compound, an acid-reacting stabilizer and a water-soluble hydrophilic organic binder, a substantially water insoluble acylacetamide as azo-coupling component and a substantially water insoluble developing agent, each dispersed as particles of .01-10 microns average size, the developing agent when heated above 100* C. creating a medium wherein coupling occurs, the acylacetamide melting above 50* C. and having solubility of less than 1 X 10 3 mol/liter in water at 20* C. The acylacetamide is yellow-coupling. Its use with a blue-coupling compound provides material that develops a black image, as by the use of dispersed particles of a N,N''-bis(acylacet)-alkyl-enediamine with 2,3dihydroxynaphthalene-6-sulfonic acid or a salt thereof.

Inventors

  • 👤 Leonardus Jacobus Anton Giesen
  • 👤 Hubertus Wilhelmus Hen Roncken

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 01:33
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 28 words
Heat-developable diazo-type material according to claim 1, wherein the acylacetamide is one having a solubility of less than 0.25 X 10 3 mol/liter in water at 20* C.
Claim 2
Dependent Claim 30 words
Heat-developable diazo-type material according to claim 2, said acylacetamide having a coupling activity which, measured in vitro, is not more than 20 times greater than the coupling activity of acetoacetanilide.
Claim 3
Dependent Claim 16 words
Heat-developable diazo-type material According to claim 1, wherein the acylacetamide is an amide of acetoacetic acid.
Claim 4
Dependent Claim 17 words
Heat-developable diazo-type a material according to claim 1, wherein said amido residue is one derived from 2,4,6-tribromoaniline.
Claim 5
Dependent Claim 17 words
Heat-developable diazo-type material according to claim 1, wherein said amido residue is one derived from 4-benzoylamino-2, 5-dialkoxyaniline.
Claim 6
Dependent Claim 22 words
Heat-developable diazo-type material according to claim 1, wherein the acylacetamide is a N,N''-bis(acylacet)-alkylenediamine having an alkylene group containing at least 8 C-atoms.
Claim 7
Dependent Claim 44 words
Heat-developable diazo-type material according to claim 1, wherein the azo-coupling component comprises, besides the acylacetamide, a quantity of a compound capable of forming a blue dyestuff by coupling with said diazo compound so that said layer when developed will give a substantially black image.
Claim 8
Dependent Claim 19 words
Heat-developable diazo-type material according to claim 8, said blue coupling compound being 2,3-dihydroxynaphthalene-6 sulfonic acid or a salt thereof.
Claim 9
Dependent Claim 24 words
Heat-developable diazo-type material according to claim 1, said developing agent being a salt of melamine and an alkane dicarboxylic acid having 9-12 C atoms.
Claim 10
Dependent Claim 173 words
In a heat-developable diazo-type material comprising a support carrying a light-sensitive layer which contains a light-sensitive diazo compound, an azo-coupling component capable of coupling with said diazo compound to form dyestuff giving a substantially black color, an acid-reacting compound as a stabilizer, a water-soluble hydrophilic organic binder, and as a developing agent dispersed particles of a compound which has a solubility of less than 2 g./liter in water at 20* C. and upon being heated above 100* C. creates a medium in which coupling of said diazo compound and said azo-coupling component will take place, the improvement wherein said azo-coupling component comprises as a blue-coupling compound 2,3-dihydroxynaphthalene-6-sulfonic acid or a salt thereof and as a yellow-coupling compound a N,N''-bis(acylacet)-alkylenediamine having an alkylene group containing at least 8 C-atoms and having a solubility of less than 0.25 X 10 3 mol/liter in water at 20* C., said developing agent and said yellow-coupling compound each being present in said layer in the form of dispersed particles of between 0.1 and 10 microns in average size.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-10-25 1975-04-26 1975-10-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-10-25 1979-04-26 1979-10-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-10-25 1983-04-26 1983-10-26 $7700.00 Window Closed / Lapsed

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