Carbocationic catalysts and process for using said catalysts

Details Carbocationic catalysts and process for using said catalysts Carbocationic catalysts and process for using said catalysts

1993-04-08

1994-09-27

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526185, 526196, 526198, 526204, 526217, 526237, 5263487, 526335, 526346, 525249, 525251, 502152, 502155, 502167, 502202, C08F 452, C08F 206

Patent

active

053508190

ABSTRACT:
A living carbocationic catalyst composition comprising an initiator of a tertiary alkyl halide, a tertiary aralkyl halide or polymeric halide a co-initiator of an alkyl aluminum or alkyl boron, a proton scavenger and a solvent medium with a dielectric constant between 2.5 and 3.25 is used to produce narrow molecular weight distribution polymers particularly isobutylene polymers.

REFERENCES:
patent: 4276394 (1981-06-01), Kennedy et al.
patent: 4278822 (1981-07-01), Ver Strate
patent: 4910321 (1990-03-01), Kennedy
patent: 4929683 (1990-05-01), Kennedy
patent: 4946899 (1990-08-01), Kennedy et al.
patent: 5169914 (1992-12-01), Kaszas
Kennedy et al, "Carbocationic Polymerization in the Presence of Sterically Hindered Bases . . . ", J. Macromol. Sci-Chem., A18(1), pp. 119-128 (1982).
"Living" Cationic Polymerization of Alpha-Methylstyrene, Matyjaszewski, et al.

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