Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1974-09-04
1976-05-11
Hamrock, William F.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260880B, C08F29704
Patent
active
039564266
ABSTRACT:
An improved process for preparing elastomeric block copolymers of the formula A-B-A, wherein A is a poly-alpha-methyl-styrene polymer block, and B is an elastomeric polymer block from a conjugated diene. Alpha-methyl-styrene is polymerized by means of a mono-functional anionic initiator and an activator with an initial monomer concentration in excess of 100 g of alpha-methyl styrene per liter of reaction mixture, at a temperature of between 0.degree. and 40.degree.C, the amount of said activator being present such that the molar ratio of activator/initiator ranges from about 0.1 and 35 for a polymerization time of no more than 120 minutes. Thereafter, a small amount of conjugated diene and/or styrene is added to the reaction mixture. Subsequently, a conjugated diene is added to the mixture and polymerized. A bi-block copolymer consisting of a poly-alpha-methyl-styrene block and a poly (conjugated diene) block is formed. Formation of the A-B-A block copolymer occurs through addition of a linking agent to this block copolymer of alpha-methyl-styrene and conjugated diene.
REFERENCES:
patent: 3778490 (1973-12-01), Asieh
Hamrock William F.
Stamicarbon B.V.
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