Title:
SULFONATED AND UNHYDROGENATED COPOLYMER OF STYRENE AND BUTADIENE
Document Type and Number:
Japanese Patent JP3483916
Kind Code:
B2
Abstract:
PURPOSE: To obtain a new composition unswelling in water which gives a new polymer-modified asphalt composition having storage stability and a low softening point by sulfonating a specific block-copolymer.
CONSTITUTION: The objective composition, which is a copolymer of a (poly)styrene and a (poly)conjugated diene selected from (poly)isoprene and (poly) butadiene, is formed by selecting from linear di-block, linear tri-block and radial tri-block, and is obtained by sulfonating a starting blockcopolymer wherein less than 25% olefinically unsaturated groups are saturated, contains less than 1 wt.% combined sulfur and also a base-neutralized product. The composition is preferably obtained at first by dissolving the starting block copolymer in an inert or non-reactive solvent such as hexane or the like and allowing it to react with a sulfonating agent such as acetylsulfate or propionylsulfate at 25 to 55°C.
Inventors:
Martin Leo Gobatty
Dennis George Pafer
Dennis George Pafer
Application Number:
JP21471093A
Publication Date:
January 06, 2004
Filing Date:
August 31, 1993
Export Citation:
Assignee:
Exxon Research and Engineering Company
International Classes:
C08F8/36; C08F297/04; C08L53/02; C08L95/00; (IPC1-7): C08F8/36; C08L95/00
Domestic Patent References:
| JP2227413A |
Attorney, Agent or Firm:
Shoichi Ui (4 others)