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:
Sep. 26, 1995
Filed:
Jul. 06, 1994
Juichi Kasai, Tokyo, JP;
Yasuo Kaneko, Tokyo, JP;
Takashi Nakauma, Aioi, JP;
Yutaka Toukai, Tatsuno, JP;
Showa Highpolymer Co., Ltd., Tokyo, JP;
Abstract
Continuous polymerization method using a tubular continuous polymerization apparatus, wherein a peg 1 for tube cleaning is passed through a polymerization solution in polymerization tube 6 while contacting with the inner wall of the tube during the polymerization. The apparatus used in the method is equipped with polymerization tube 6; a first raw material inlet tube 8 connected with polymerization tube 6; a peg inlet tube 4 connected with polymerization tube 6; a second raw material inlet tube 10 connecting tube 8 with tube 4; valve 5 for opening and shutting between polymerization tube 6 and tube 8; valve 3 for opening and shutting between tube 10 and tube 4; and valve 7 for opening and shutting a connection between the tube 8 and tube 10. The invention can (1) eliminate the washing and cleaning of the polymerization tube at the exchange of species; (2) reduce loss in raw material and time which goes on until the inside of the tube reaches a steady state and (3) prevent scale production on the inner wall of the polymerization tube.