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Light-sensitive copying material with o-quinone diazide and phenolic hydroxy compound
| Details |
Inventors: Stahlhofen, Paul; Beutel, Rainer;
Assignee: Hoechst Aktiengesellschaft (Frankfurt am Main, DE)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
This invention relates to an improvement in a light-sensitive copying material comprising a carrier and a light-sensitive copying layer which contains, as the light-sensitive compound, an o-quinone diazide sulfonic acid ester or an o-quinone diazide sulfonic acid amide, the improvement being that the layer also contains a compound with an aromatic or aliphatic hydroxy group which is capable of forming chelate compounds. |
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DETAILED DESCRIPTION What is claimed is: 1.
A light-sensitive copying material comprising (A) an anodized aluminum support and (B) a positive-working, light-sensitive copying layer immediately adjacent to said support, said copying layer containing (i) an alkali-soluble resin, (ii) one selected from the group consisting of an o-quinone diazide sulfonic acid ester and an o-quinone diazide sulfonic acid amide; and (iii) at least one phenolic hydroxy compound selected from the group consisting of 8-hydroxy-quinoline, 2,3,4-trihydroxy-benzophenone and 1,2,4-trihydroxy-anthraquinone, said phenolic hydroxy compound being present in said copying layer in an amount between about 0.
3 and 15 weight-percent, based on the weight of solid components in said copying layer.
2.
Copying material according to claim 1, wherein said alkali-soluble resin comprises a novolak.
3.
Copying material as claimed in claim 1, wherein said phenolic hydroxy compound is 2,3,4-trihydroxybenzophenone.
Description:
The present invention relates to a light-sensitive copying material which comprises a carrier and a positive-working light-sensitive copying layer and which may be used for the production of planographic printing forms.
Generally, metallic carriers, preferably aluminum carriers, are used for the production of materials of this type.
In practice, layers containing o-quinone diazides as the light-sensitive compound are preferred as positive-working copying layers.
Although layers of this type yield useful results even if they are applied to untreated aluminum, the aluminum surface is normally roughened by a mechanical, chemical, or electrochemical process before applying the copying layer.
In most cases, this results in a considerable improvement of the adhesion of the unexposed layer, and, consequently, in an improved resistance to developer solutions and the production of longer printing runs.
A further improvement of these properties may be achieved by anodization of the possibly previously roughened aluminum surface
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