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. 26, 1983
Filed:
Jan. 06, 1982
Gerhard Sprintschnik, Hofheim, DE;
Hoechst Aktiengesellschaft, , DE;
Abstract
The invention relates to a developer mixture for developing exposed, light-sensitive reproduction layers which contain a diazonium salt polycondensation product. The mixture comprises water, a salt of an alkanoic acid and a surfactant and contains 0.5 to 15 percent by weight, in particular 1 to 10 percent by weight, of at least one salt of an alkanoic acid having 8 to 13 carbon atoms and 0.5 to 20 percent by weight, in particular 1 to 12 percent by weight, of at least one low-foaming, nonionic surfactant. These surfactants preferably include optionally modified block polymers formed from ethylene oxide and propylene oxide. The invention also relates to a process for developing negative-working reproduction layers, of the composition indicated above, with the developer mixture according to the invention.