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Title:
PRODUCTION OF POLYMER
Document Type and Number:
Japanese Patent JP3226969
Kind Code:
B2
Abstract:

PURPOSE: To obtain a polymer excellent in color tone, transparency, retention of transparency, and resistance to thermal discoloration by adding a terminator to a solution of a polymer of either a conjugated diene or a vinyl aromatic hydrocarbon and then adding a phosphoric ester and phosphoric acid.
CONSTITUTION: The production process comprises polymerizing a conjugated diene and/or a vinyl aromatic hydrocarbon in a hydrocarbon solvent using an organolithium compound as an initiator, adding a reaction terminator having active hydrogen to the solution of either the resulting polymer or a hydrogenation product thereof, and then adding a phosphoric ester and phosphoric acid in amounts of 0.01-0.5mol and 0.1-1mol, respectively, per mole of the organolithium compound, before removing the solvent by steam stripping. The polymerization is generally conducted at -10 to 15-°C for at most 48hr. The atmosphere for the polymerization system is preferably replaced with, e.g. an inert gas such as nitrogen.


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Inventors:
Hoshi, Susumu
Yanagihara, Hiroshi
Application Number:
JP1992000201498
Publication Date:
November 12, 2001
Filing Date:
July 28, 1992
Export Citation:
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Assignee:
ASAHI CHEM IND CO LTD
International Classes:
C08C2/02; C08C2/00; C08C19/02; C08F6/06; C08F8/04; C08F36/00; C08F36/04; C08F297/02; (IPC1-7): C08F6/06; C08C2/02; C08F8/04; C08F36/04; C08F297/02
Attorney, Agent or Firm:
渡辺 一雄