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, 2002
Filed:
Sep. 14, 1998
Kenji Ebara, Yokohama, JP;
Asahi Kasei Kabushiki Kaisha, Osaka, JP;
Abstract
A process for producing a vinyl polymer which comprises carrying out anionic polymerization under the condition that the polymerization temperature is not lower than 45° C. and not higher than 250° C. and the concentration of the vinyl monomer based on the polymerization solvent is 45-100% by weight, wherein the metal of the cation forming a counterpart to the carbonic anion at the polymerization propagating species consists essentially of Mg, or Mg and M wherein M is at least one alkali metal selected from the group consisting of Li, Na and K, and the molar concentrations of the metals of Mg and M satisfy the relation of [Mg]/[M ]≧4, the invention also relates to a vinyl monomer polymerization initiator comprising (R ) Mg wherein R is a hydrocarbon group.