C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 210/12 (2006.01) C08F 210/10 (2006.01)
Patent
CA 2098672
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 x 10 -5 to about 1 x 10 -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: (see formula I) in which R1, R2 and R3 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 x 10 -4 to about 1 x 10 -3 moles of water per litre of inert organic solvent into a suitable reaction vessel at a temperature of from about -120°C to about -50°C, adding a solution of from about 5 x 10 -5 to about 1 x 10 -2 moles of a Lewis acid per mole of isobutylene in an organic solvent and polymerizing the monomers to form said butyl rubber.
Kaszas Gabor
Puskas Judit Eva
Brunet Robert A.h.
Lanxess Inc.
Polysar Rubber Corporation
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