Synthesis of ABA triblock polymers and A.sub.n B star polymers f

Details Synthesis of ABA triblock polymers and A.sub.n B star polymers f Synthesis of ABA triblock polymers and A.sub.n B star polymers f

1989-06-07

1990-08-28

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528405, 528416, 528417, C08G 5968, C08G 6504, C08L 7100

Patent

active

049526448

ABSTRACT:
ABA triblock and A.sub.n B star polymers are produced by sequential cationic polymerization of 4 and 5 member ring cyclic ethers to initially form a B block and subsequent cationic polymerization of 4 and 5 member ring cyclic ethers to form A blocks at the termini of the B block. The B block is grown from the hydroxyl groups of a polyol having two or more hydroxyl groups, resulting in a B block having terminal hydroxyl functionality of two or greater. In growing each of the B and A blocks, the acid catalyst is used at a molar ratio relative to hydroxyl groups of the polyol initiator of between about 0.05:1 and about 0.5:1.

REFERENCES:
patent: 3636132 (1970-07-01), Saegusa et al.
patent: 4393199 (1983-07-01), Manser
patent: 4483978 (1984-11-01), Manser
patent: 4806613 (1989-02-01), Wardle

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