Process for producing block copolymer
Abstract
Abstract A SELF-CURING BLOCK COPOLYMER, WHICH HAS IMPROVED ELASTOMERIC PROPERTIES WITHOUT BEING SUBJECTED TO ANY SPECIAL CHEMICAL OR PHYSICAL TREATMENT, IS OBTAINED BY ANIONICALLY POLYMERIZING A VINYL-SUBSTITUTED AROMATIC HYDROCARBON IN THE PRESENCE OF AN ORGANO MONOLITHIUM COMPOUND AS CATALYST, AND AFTER SUBSTANTIAL COMMENCEMENT OF POLYMERIZATION OF THE VINYL-SUBSTITUTED AROMATIC HYDROCARBON, COPOLYMERIZING A CONJUGATED DIENE IN THE PRESENCE OF THE VINYL-SUBSTITUTED AROMATIC HYDROCARBON, AND AFTER SUBSTANTIAL COMPLETION OF POLYMERIZATION OF THE CONJUGATED DIENE, ADDING A CHELATING BI- OR TRI-FUNCTIONAL LEWIS BASE TO CONTINUE THE POLYMERIZATION OF THE VINYL-SUBSTITUTED AROMATIC HYDROCARBON. THE BLOCK COPOLYMER THUS OBTAINED HAS A HIGH TENSILE STRENGTH AND HIGH ELONGATION IN THE UNVULCANIZED STATE AND CAN BE PROCESSED SIMILARLY TO A THERMOPLASTIC RESIN BY INJECTION AND EXTRUSION TECHNIQUES.
Inventors
- 👤 T Shimomura
- 👤 H Nagata
- 👤 Y Murakami
- 👤 H Sanno
- 👤 T Inoue
Bibliographic Details
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