Diene block copolymers
Abstract
Abstract A PROCESS IS PROVIDED FOR MAKING ALL-DIENE BLOCK COPOLYMER BY (1) FORMING A CONJUGATED DIENE POLYMER BLOCK HAVING MORE THAN ABOUT 25% 1,2 OR 3,4 MICROSTRUCTURE BY POLYMERIZING A CONJUGATED DIENE USING MONOFUNCTIONAL ORGANOLITHIUM INITIATOR IN THE PRESENCE OF A POLAR COMPOUND SELECTED FROM THE GROUP ETHERS, THIOETHERS, TERTIARY AMINES AND HEXA ALKYL PHOSPHORAMIDES, THEN (B) ADDING A COMPLEXING AGENT, SUCH AS DIALKYL ZINC,SELECTED FROM THE GROUP DIALKYL AND DIARALKYL COMPOUNDS OF METALS OF GROUP II OF THE PERIODIC TABLE, TO NULLIFY THE EFFECTS OF THE POLAR COMPOUND, AND THEN (C) FORMING A CONJUGATED DIENE POLYMER BLOCK HAVING A LOWER 1,2 MICROSTRUCTURE. THE PRODUCTS ARE USEFUL AS ELASTOMERS, AND MAY BE VULCANIZED, IF DESIRED.
Inventors
- 👤 La Mare H De
Bibliographic Details
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