Title: Method for bulk polymerization of vinyl chloride

Abstract: Vinyl chloride monomers or a monomeric mixture composed mainly of vinyl chloride is bulk-polymerized in a polymerization vessel. The inner walls and other surfaces of said vessel, coming into contact with the monomer or monomers, are coated with one or more specifically selected inorganic or organic compounds having a solubility greater than 0.5 g in 100 g of water at 25.degree. C and a boiling point higher than 60.degree. C. This bulk polymerization method serves to greatly reduce the deposition of polymer scale on the vessel walls and other surfaces. In addition the polymer scale deposited can be readily separated and removed by merely washing with water or gas under pressure. The present method provides high quality polymers.

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Inventors: Ogawa, Kinya (Hazaki, JP)
Kurimoto, Kazuhiko (Hazaki, JP)
Eguchi, Yoshitugu (Kamisu, JP)
Kuwata, Satoshi (Kamisu, JP)

Application Number: 667303
Filing Date: 1976-03-16
Publication_date: 1978-07-04
Assignee: Shin-Etsu Chemical Co., Ltd. (Tokyo, JP)
Primary Class(es): 526/62 526/74, 526/344, 528/484
Other Classes:
US Patent Ref:

3515709	Jun, 1970	Nelson et al.	526/62.
3778423	Dec, 1973	Reiter	526/62.
3926910	Dec, 1975	Mowdood	526/74.
4016341	Apr, 1977	Ogawa et al.	526/62.
4024330	May, 1977	Morningstar et al.	526/62.

Other Refs: 2,105,5792,357,86930,343

Apr, 1972	FR
May, 1974	DE
Oct, 1970	JP

Primary Examiner: Holler, Alan
Assistant Examiner:
Attorney: Bierman & Bierman