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:
Jan. 08, 1980
Filed:
Dec. 12, 1977
Johann Bauer, Burghausen, DE;
Hans Birke, Marktl, DE;
Kurt Fendel, Schildgen, DE;
Harald Sulek, Burghausen, DE;
Wacker- Chemie GmbH, Munich, DE;
Abstract
A process for the manufacture of vinyl chloride copolymers soluble in lacquer solvents with a clear solution consisting of copolymerizing vinyl chloride and at least one other olefinically-unsaturated compound copolymerizable with vinyl chloride under suspension copolymerization conditions in an aqueous dispersion and in the presence of (a) a monomer-soluble polymerization catalyst, (b) a water-soluble salt of a maleic acid anhydride mixed polymerizate of maleic acid anhydride, an olefinically unsaturated ester or ether of at least 7 carbon atoms, and another vinyl monomer, (c) from 0.003% to 0.007% by weight of a polyvinyl alcohol having a low viscosity and a high saponification number and (d) from 0.03% to 0.05% by weight of sodium chloride, whereby a vinyl chloride copolymer is obtained having the majority of its particles of a size between 0.1 and 0.5 mm.