Multilithium polymerization initiators

Details Multilithium polymerization initiators Multilithium polymerization initiators

1985-08-23

1987-07-07

Briggs, Sr., Wilbert J.

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

Synthetic resins

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

525193, 525271, 525314, 526173, 526175, C08F 200, C08F29704

Patent

active

046788379

ABSTRACT:
An alternate procedure for preparing multilithium initiators using DVB has been developed in order to achieve better control over the specific number of anionic sites per initiator molecule and to prepare star-block copolymers having a pre-determined number of branches. The process consists of 3 distinct steps; oligomerization, activation and polymer growth. The initial step involves the oligomerization of DVB yielding a mini-block having a predetermined number of pendant vinyl groups using a monofunctional initiator such as polystyryllithium. This is quickly followed by activation of the pendant vinyl groups using s-butyllithium prior to polymer growth.

REFERENCES:
patent: 3644322 (1972-02-01), Farrar
patent: 3957913 (1976-05-01), Roest et al.
patent: 4409368 (1983-10-01), Vitus et al.
patent: 4482677 (1984-11-01), Teranaka et al.

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