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:
Sep. 15, 1992
Filed:
Apr. 12, 1990
Jorg Gitzel, Hattersheim am Main, DE;
Hans-Tobias Macholdt, Darmstadt, DE;
Wolfgang Knaup, Burgkirchen, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
Use of colorless highly fluorine-substituted phosphonium compounds as charge control agents for electrophotographic recording processes Use of highly fluorine-substituted phosphonium compounds of the formula (I) ##STR1## in which R.sub.1 to R.sub.4 are hydrogen atoms or organic radicals, at least one of the radicals R.sub.1 to R.sub.4 being a fluorine-substituted, unsaturated and/or saturated alkyl radical having 1 to 30 carbon atoms and 3 to 50 fluorine atoms, which can contain further substituents, or a fluorine-substituted aryl radical or an aralkyl radical which is fluorine-substituted on the aromatic ring, it being possible for the aryl or aralkyl radical to be additionally substituted on the aromatic ring, and in the case of an aralkyl radical the alkyl bridge between the phosphorus atom and the aromatic ring contains 1 to 30 carbon atoms, and not more than three of the radicals R.sub.1 and R.sub.4, independently of one another, are hydrogen atoms, unsaturated or saturated, substituted or unsubstituted alkyl radicals having 1 to 30 carbon atoms, aryl or aralkyl radicals which can be substituted on the aromatic ring, and X.sup.- is an anion, it being possible for the radicals R.sub.1 to R.sub.4 to contain a COO.sup.- or SO.sub.3.sup.- group as substituent and X.sup. - in this case becoming superfluous, individually or in combination as colorless charge control agents having a positive or negative control effect in toners and developers for electrophotographic recording processes.