End-blocked copolymers of vinyl monomers with cyclic monomers and method for preparing the same
Abstract
Abstract END-BLOCKED COPOLYMERS CONSISTING OF MOLECULAR CHAINS OF VINYL POLYMERS CONNECTED AT LEAST AT ONE CHAIN TERMINAL TO THE CHAIN TERMINAL OF A RING-OPENED UNIT TO TWO OR MORE OF THE CYCLIC COMPOUNDS OF THE GROUP OF B-LACTONES, E-CAPROLACTONE AND ETHYLENE OXIDE, THE CONNECTION BETWEEN THE VINYL CHAIN AND THE CHAIN OF THE CYCLIC COMPOUND BEING BY WAY OF AMIDE OR NITROGEN. THE INVENTION ALSO COMPRISES A METHOD FOR MAKING THE END-BLOCKED COPOLYMERS IN A THREE-STEP PROCESS, WHEREIN THE FIRST STEP CONSISTS OF POLYMERIZATION OF A VINYL-TYPE MONOMER IN THE PRESENCE OF A HALOGEN COMPOUND YIELDING A POLYMER HAVING A HALOGEN AT ONE OR BOTH CHAIN ENDS, WHICH IS CONVERTED IN A SECOND STEP INTO AN W-AMINOPOLYMER BY REACTION WITH AMMONIA OR AN AMIDE, AND WHEREIN THE ADDITION OF ONE OR MORE CYCLIC COMPOUNDS OF THE GROUP COMPRISING A B-LACTONE, E-CAPROLACTONE, AND ETHYLENE OXIDE IS EFFECTED IN A THIRD STEP.
Inventors
- 👤 Shitomi Katayama
- 👤 Hideichi Horikawa
Bibliographic Details
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