Bi- and Trifunctional organolithium initiators and applications

Details Bi- and Trifunctional organolithium initiators and applications Bi- and Trifunctional organolithium initiators and applications

1980-07-03

1982-01-19

Hamrock, William F.

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Bipolar transistor

525259, 525266, 525271, 525299, 525314, 525388, C08F 448, C08F27902

Patent

active

043118186

ABSTRACT:
New organo-lithium initiators, their synthesis, and their use. The initiators have the formula: ##STR1## in which R" is either a hydrogen atom or a methyl radical; either n is 1, in which case R'=H and m and p are integers, the sum of which is between 0 and 10 inclusive, or n is 2, R' then being an alkyl radical of 2 to 8 carbon atoms and m=p=o; and R is an alkyl radical of 1 to 4 carbon atoms.
The initiators are prepared by reacting compounds of the formula; ##STR2## with an alkyl-lithium RLi in a non-polar solvent in the absence of any polar solvent or complexing agent.
The initiators are used to prepare polydienes of high stereoregularity by reacting with a diene, and the polydiene is used to prepare a three-block or star copolymer by reacting with an anionically polymerizable monomer.

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