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. 02, 1985
Filed:
Dec. 16, 1983
Heinz Herrmann, Wiesbaden, DE;
Hans-Joachim Schlosser, Wiesbaden, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
The invention relates to a liquid developer with negatively charged toner particles for developing electrostatic charge images. It is composed of a carrier liquid of high electric resistivity and low dielectric constant, pigments or dyes, a binder, a dispersing agent and a charge control agent, such as an N-vinylpyrrolidone-containing polymer, a waxy substance and conventional additives. The liquid developer additionally contains at least one wax which is readily soluble in the carrier liquid at increasing temperatures, but difficultly soluble at room temperature, which reduces the specific electric conductivity of the liquid developer and which has a softening point within a range of from about 50.degree. to 120.degree. C. and an acid number of from about 0 to 200.