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:
Aug. 06, 1996
Filed:
Oct. 27, 1994
Toshihiko Nakano, Kamisu-machi, JP;
Tadashi Amano, Kamisu-machi, JP;
Yoshitaka Okuno, Kamisu-machi, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
The method of the present invention lies in a method for forming a scale preventive coating for preventing polymer scale deposition generated on inner walls of a polymerization vessel during polymerization, wherein a coating liquid containing a scale preventive agent is sprayed from an upper portion in the closed polymerization vessel, suction of gas in the vessel is simultaneously performed from a bottom portion of the polymerization vessel, an excessive coating liquid is discharged, and a coating of the scale preventive agent is formed on inner walls of the polymerization vessel. According to this method, a coating of a scale preventive agent can be uniformly formed throughout the entire inner walls of a polymerization vessel even in the case of a closed and large polymerization vessel having a volume, for example, not less than 80 m.sup.3. Especially, it is extremely suitable for large scale industrial production because a coating can be effectively formed even on portions such as a valve at the bottom of the polymerization vessel. Further, operations (heating, spraying, suction) for coating formation can be allowed to proceed simultaneously, and discharge of an excessive coating liquid is simultaneously performed. Thus it also becomes possible to greatly reduce the time required for the coating formation operations.