Title:
METHOD FOR SULFONATION
Document Type and Number:
Japanese Patent JP3271238
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a sulfonation method by which a (waste) polystyrene resin can be sulfonated in a high reactant concentration to stably convert it into a polyelectrolyte.
SOLUTION: In sulfonating a polystyrene resin in a solvent, an alicyclic unsaturated hydrocarbon is added to the reaction system. The alicyclic unsaturated hydrocarbon used is a six-membered alicyclic unsaturated hydrocarbon (limonene). The amount of addition is 0.01-5wt.% based on the styrene polymer. The alicyclic unsaturated hydrocarbon is sulfonated during the sulfonation of the polystyrene resin, and the sulfonate acts as a surfactant for the product slurry to improve its dispersibility. As a result, the sulfonation reaction can be stably performed even when the reactant concentration is high during the sulfonation.
Inventors:
Yasushi Inagaki
Haruo Watanabe
Tsutomu Noguchi
Haruo Watanabe
Tsutomu Noguchi
Application Number:
JP165097A
Publication Date:
April 02, 2002
Filing Date:
January 08, 1997
Export Citation:
Assignee:
ソニー株式会社
International Classes:
C08J11/28; C08F8/36; C08F12/06; (IPC1-7): C08F8/36; C08F12/06
Domestic Patent References:
| JP62174205A |
Attorney, Agent or Firm:
Akira Koike (2 outside)