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:
Feb. 28, 1978
Filed:
Dec. 03, 1976
Kazuhiko Katayama, Kobe, JA;
Masahiko Nishigaki, Nishinomiya, JA;
Akira Ohtani, Kobe, JA;
Nobutaka Tani, Kobe, JA;
Minoru Nishizawa, Kobe, JA;
Hirokazu Nakanishi, Kobe, JA;
Kanegafuchi Kagaku Kogyo Kabushiki Kaisha, Osaka, JA;
Abstract
In the suspension polymerization in an aqueous medium of vinyl chloride alone or of a monomer mixture comprising vinyl chloride as a major component and other monomers copolymerizable therewith as a minor component, depositin of polymer scales on the inside surfaces of the polymerization vessel is surprisingly prevented by coating the interior surface of the vessel and auxiliary equipment prior to the polymerization with at least one compound selected from the group consisting of hydroxyhydroquinone and pyrogallol.