Process for copolymerizing conjugated dienes
Abstract
Abstract A DIENE OF 4 TO 6 CARBON ATOMS AND STYRENE OR OTHER VINYL AROMATIC MONOMER, INCLUDING ALKYLATED VINYL AROMATIC MONOMERS, ARE COPOLYMERIZED IN A HYDROCARBON SOLVENT USING A SUBSTANTIAL AMOUNT OF EACH MONOMER AND UTILIZING AS THE CATALYST, ALKYLLITHIUM AND POTASSIUM HYDROXIDE. THEY MAY BE ADDED SEPARATELY OR MAY BE COMPLEXED BEFORE BEING ADDED TO THE REACTION MIXTURE. THE RESULTING COPOLYMER IS A COPOLYMER OF SUBSTANTIALLY CONSTANT COMPOSITION (I.E. A COPOLYMER CONTAINING NO SUBSTANTIAL BLOCK OF VINYL MONOMER); AND IT HAS SUBSTANTIALLY THE MICROSTRUCTURE OF A NORMAL POLYMER INITIATED BY AN ORGANOLITHIUM CATALYST. THE DIENE MAY BE BUTADIENE, ISOPRENE, PIPERYLENE OR 2,3-DIMETHYLBUTADIENE OR A MIXTURE THEREOF. THE VINYL AROMATIC MONOMER MAY BE STYRENE OR AN ALKYLATED STRYRENE OR VINYL NAPHTHYLENE OR ALKYLATED VINYL NAPHTHYLENE OR A MIXTURE THEREOF.
Inventors
- 👤 A Halasa
Bibliographic Details
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