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:
Oct. 10, 2006
Filed:
Oct. 31, 2002
Applicants:
Jun Watanabe, Ohtake, JP;
Shigeyuki Yoshida, Ohtake, JP;
Inventors:
Jun Watanabe, Ohtake, JP;
Shigeyuki Yoshida, Ohtake, JP;
Assignee:
Daicel Chemical Industries, Ltd., Sakai, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 63/08 (2006.01); C08G 69/08 (2006.01); C08G 6/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A process for the continuous production of an ε-caprolactone polymer characterized by including heating an ε-caprolactone under reduced pressure or in an inert gas stream to volatilize the unreacted ε-caprolactone from the polymer and cooling the vapor phase part containing the matter volatilized to thereby recover the unreacted ε-caprolactone, wherein the amount of the ε-caprolactone to be recovered is regulated to larger than 5 times by weight the amount of caprolactone dimer.