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:
Nov. 15, 1994
Filed:
Jun. 24, 1993
Reiner Fuchs, Ober-Ramstadt, DE;
Johannes Kaufhold, Lindenfels, DE;
Kornelia Malzacher, Lindenfels, DE;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
The invention relates to a process for the preparation of a pulverulent diorganotin dicarboxylate, which comprises reacting a diorganotin oxide of the formula I, ##STR1## in which R.sup.1 and R.sup.2, independently of one another, are C.sub.1 -C.sub.8 alkyl, at a temperature in the range from 45.degree. C. to 70.degree. C. in the absence of solvents and adsorbents with a dicarboxylic acid of the formula II ##STR2## in which R.sup.3 is C.sub.1 -C.sub.18 alkylene, cycloalkylene having 5 to 7 carbon atoms, phenylene, C.sub.1 -C.sub.18 alkenylene or C.sub.1 -C.sub.8 alkylene substituted by 1 or 2 hydroxyl groups, or its anhydride, and subjecting the reaction mixture and the product during the reaction and the subsequent cooling phase to constant thorough mixing. The diorganotin dicarboxylates thus obtained are suitable for the stabilization of chlorine-containing polymers against the damaging effect of light, oxygen and/or heat.