The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 06, 1993
Filed:
Jun. 02, 1988
Paul Stahlhofen, Wiesbaden, DE;
Otfried Gaschler, Wiesbaden, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
The invention relates to a photosensitive mixture which essentially contains an ester or an amide of a 1,2-naphthoquinonediazide sulfonic or carboxylic acid as the photosensitive compound, a phenolic resin which is soluble in aqueous-alkaline solutions and insoluble in water as the binder, and an additional speed enhancer, which corresponds to the general formula ##STR1## where X denotes a single bond, CH.sub.2, SO.sub.2, S, CO, C(CH.sub.3).sub.2, CHCC1.sub.3 or ##STR2## Biphenyldiol-(4,4'), bis-(4-hydroxyphenyl)-ketone, 2,2-bis-(4-hydroxy-phenyl)-propane or bis-(4-hydroxyphenyl)-sulfone are described as suitable compounds. The mixture is employed as photosensitive layers in recording materials suitable for the production of printing forms. The invention provides for an increased photospeed, without any disadvantages occurring in respect of the copying or printing behavior.