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. 28, 1997
Filed:
Jul. 21, 1995
Toshihiko Nakano, Kamisu, JP;
Tadashi Amano, Kamisu, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
A process for the production of a vinyl chloride polymer by suspension polymerization of vinyl chloride, optionally in the presence of other vinyl monomers, in an aqueous medium, in the presence of an oil-soluble polymerization initiator, which is a combination of (A) t-butyl peroxyneoheptanoate, and (B) a peresteric peroxide, such as t-butyl peroxyneodecanoate, other than the above component (A), in a polymerization vessel having at its inner wall surface, a polymer scale deposition preventative coating, which is formed by applying an alkaline coating liquid, of (a) at least one condensation product of a quinone compound and a condensate of a quinone compound with an amino group containing diphenyl compound, and (b) at least one of the substances, a water-soluble polymer compound, an inorganic colloid or an alkali metal silicate, followed by drying the above coating. According to this process, a vinyl chloride polymer can be produced having excellent properties, such as initial coloration, in a short polymerization time, while suppressing deposition of polymer scale in the polymerization vessel.