Light-sensitive mixture based on O-naphthoquinone diazide ester of condensate of bisphenol and formaldehyde and light-sensitive copying material prepared therefrom
AssigneeHoechst Aktiengesellschaft
InventorPaul Stahlhofen
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Abstract
A light-sensitive mixture is described, which contains, as the light-sensitive compound, a 1,2-naphthoquinone-2-diazidesulfonic acid ester of the general formula I ##STR1## in which R and R' denote hydrogen atoms or lower alkyl groups, X denotes a saturated alkylene, hydroxyalkylene or dihydroxyalkylene group having 6 to 18 carbon atoms, D denotes the 1,2-naphthoquinone-2-diazide-5-sulfonyl radical or the 1,2-naphthoquinone-2-diazide-4-sulfonyl radical and n denotes a number from 1 to 20. The new quinone diazides produce printing plates which are capable of long printing runs and have good resistance to developer and good flexibility of the printing stencil.
Claims14
A light-sensitive mixture, comprising:
- a light-sensitive compound selected from a 1,2-naphthoquinone-2-diazide-sulfonic acid ester of a condensation product formed from a bisphenol and formaldehyde, wherein the ester corresponds to the formula I ##STR4## in which R and R' denote hydrogen atoms or lower alkyl groups, X denotes a saturated alkylene, hydroxyalkylene or dihydroxyalkylene group having 6 to 18 carbon atoms, D denotes the 1,2-naphthoquinone-2-diazide-5-sulfonyl radical or the 1,2-naphthoquinone-2-diazide-4-sulfonyl radical and n denotes a number from 1 to 20;
- and
- a binder which is insoluble in water, but is soluble or at least swellable in aqueous alkaline solutions, wherein said ester and said binder are present in amounts sufficient to promote, upon exposure to light, a differentiation of solubility between exposed and unexposed portions of said mixture in dilute aqueous-alkaline solutions.
A light-sensitive copying material, comprising:
- a layer support;
- and
- a light-sensitive layer containing:
- a light-sensitive compound selected from 1,2-naphthoquinone-2-diazidesulfonic acid ester of a condensation product formed from a bisphenol and formaldehyde, wherein the ester corresponds to the formula I ##STR5## in which R and R' denote hydrogen atoms or lower alkyl groups, X denotes a saturated alkylene, hydroxyalkylene or dihydroxyalkylene group having 6 to 18 carbon atoms, D denotes the 1,2-naphthoquinone-12-diazide-5-sulfonyl radical or the 1,2-naphthoquinone-2-diazide-4-sulfonyl radical and n denotes a number from 1 to 20, said ester being present in an amount sufficient to cause, upon exposure to light, a difference in solubilities between exposed and unexposed areas of said layer in dilute aqueous-alkaline solutions;
- and
- a binder which is insoluble in water, but is soluble or at least swellable in aqueous alkaline solutions and is present in an amount to promote said differentiation of solubilities.
Dependencies are inferred from the claim text.