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:
Apr. 23, 1996
Filed:
Sep. 16, 1994
Toshiyuki Akizawa, Oita, JP;
Hiroyuki Hasegawa, Oita, JP;
Hitoshi Nakamura, Oita, JP;
Katsufumi Urabe, Kobe, JP;
Shingo Yoshida, Kobe, JP;
Yuichi Matsuda, Kobe, JP;
Tamiharu Sakai, Kobe, JP;
Showa Denko K.K., Tokyo, JP;
Kabushiki Kaisha Kobe Seiko Sho, Hyogo, JP;
Abstract
The present invention provides a process for purifying a polar vinyl compound, comprising pressurizing a crude polar vinyl compound containing impurities such as polymerization inhibiting substances and components of starting materials used in preparation of the polar vinyl compound to 500-3000 atm at 0.degree.-100.degree. C., the polar vinyl compound having at least one member selected from among oxygen, nitrogen and sulfur atoms, to thereby form crystals of the polar vinyl compound and separating the crystals of the polar vinyl compound from a liquid phase under pressure.