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US4416976A Expired / Lapsed US ⏱️ 0.0 years remaining

Developer solution for the development of exposed negative-working diazonium salt layers

Assignee: Hoechst AG
•
Filing: 1981-03-31
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Granted: 1983-11-22
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Expires: 2001-03-31
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Abstract

Abstract This invention relates to a developer solution for the development of exposed light-sensitive reproduction layers comprising a water-insoluble binder and a water-insoluble diazonium salt polycondensation product. As the essential constituents, this developer solution contains glycol ethers, glycol esters and water, in detail--about 30 to 80% of a compound of the formula ##STR1## wherein n=1 to 4 and m=1 to 5; about 3 to 30% of a compound of the formula ##STR2## wherein R 1 and R 2 are acyl groups containing 1 to 4 carbon atoms, or one of the two groups is a hydrogen atom and R 3 is a hydrogen atom or a methyl group; about 0 to 15% of 1,3-dioxolane-2-one or 4-methyl-1,3-dioxolane-2-one; about 0 to 20% of a polyhydric alcohol; about 0 to 10% of an organic or inorganic salt which is soluble in the solvent mixture; and about 5 to 45% of water. The invention relates further to a process for the development of negative-working reproduction layers based on (a) water-insoluble diazonium salt polycondensation products and (b) binders which are insoluble in water and in dilute aqueous alkaline solutions. In the process, the exposed reproduction layer is treated with the above-specified developer solution in order to dissolve the unexposed layer areas.

Inventors

  • 👤 Loni Schell

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 19:35
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/30; G03F7/32

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 156 words
A developer solution for the development of exposed, light-sensitive reproduction layers which comprise a water-insoluble binder and a water-insoluble diazonium salt polycondensation product, the essential constituents of the solution being glycol ethers, glycol esters and water, and said solution consisting essentially of, by weight: (a) 30 to 80 percent of a compound of the formula ##STR7## wherein n=1 to 4 and m=1 to 5, (b) 3 to 30 percent of a compound of the formula ##STR8## wherein R 1 and R 2 are acyl groups containing 1 to 4 carbon atoms, or one of the two groups is a hydrogen atom and R 3 is a hydrogen atom or a methyl group, (c) 0 to 15 percent of 1,3-dioxolane-2-one or 4-methyl-1,3-dioxolane-2-one, (d) 0 to 20 percent of a polyhydric alcohol, (e) 0 to 10 percent of an organic or inorganic salt which is soluble in the solvent mixture, and (f) 5 to 45 percent of water.
Claim 2
Dependent Claim 156 words
A developer solution for the development of exposed, light-sensitive reproduction layers which comprise a water-insoluble binder and a water-insoluble diazonium salt polycondensation product, the essential constituents of the solution being glycol ethers, glycol esters and water, and said solution consisting essentially of, by weight: (a) 30 to 80 percent of a compound of the formula ##STR7## wherein n=1 to 4 and m=1 to 5, (b) 3 to 30 percent of a compound of the formula ##STR8## wherein R 1 and R 2 are acyl groups containing 1 to 4 carbon atoms, or one of the two groups is a hydrogen atom and R 3 is a hydrogen atom or a methyl group, (c) 0 to 15 percent of 1,3-dioxolane-2-one or 4-methyl-1,3-dioxolane-2-one, (d) 0 to 20 percent of a polyhydric alcohol, (e) 0 to 10 percent of an organic or inorganic salt which is soluble in the solvent mixture, and (f) 5 to 45 percent of water.
Claim 3
Dependent Claim 16 words
A developer solution as claimed in claim 1 which has a pH between 12 and 2.
Claim 4
Dependent Claim 27 words
A developer solution as claimed in claim 1 which contains 0.5 to 8 percent by weight of an alkali salt or ammonium salt of an organic acid.

References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-11-21 1987-05-23 1987-11-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-11-21 1991-05-23 1991-11-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-11-21 1995-05-23 1995-11-22 $7700.00 Window Closed / Lapsed

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