Preparation of butyl rubber with bimodal molecular weight distri

Details Preparation of butyl rubber with bimodal molecular weight distri Preparation of butyl rubber with bimodal molecular weight distri

1992-07-15

1993-03-16

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 91, 526185, 526210, 526237, 526339, C08F 414, C08F21012

Patent

active

051945380

ABSTRACT:
A polymerization process is provided for producing a butyl rubber with a bimodal molecular weight distribution which comprises introducing isobutylene, a conjugated diolefin monomer having from 4 to 8 carbon atoms, from about 1.times.10.sup.-5 to about 1.times.10.sup.-3 moles of an initiator component per mole of isobutylene, said initiator component being selected from the group consisting of an initiator component having the formula: ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 are selected from the group consisting of alkyl, aryl and aralkyl groups and can be the same or different and i is a positive whole number from 2 to 6, and an initiator component having an adamantyl nucleus bearing from 2 to 4 hydroxyl groups an inert organic solvent and from about 1.times.10.sup.-4 to about 1.times.10.sup.-3 moles of water per liter of inert organic solvent into a suitable reaction vessel at a temperature of from about -120.degree. C. to about -50.degree. C., adding a solution of from about 5.times.10.sup.-5 to about 1.times.10.sup.-2 moles of a Lewis acid per mole of isobutylene in an organic solvent and polymerizing the monomers to form said butyl rubber.

REFERENCES:
patent: 2781334 (1957-02-01), Welch et al.
patent: 4942210 (1990-07-01), Kuntz
patent: 5071913 (1991-12-01), Powers et al.

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