Polymerization of iso-butylene

Details Polymerization of iso-butylene Polymerization of iso-butylene

1994-10-07

1995-09-05

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526131, 526170, 526339, 5263487, C08F 4649, C08F 4643, C08F 1010

Patent

active

054480019

ABSTRACT:
Iso-butylene based polymers and particularly butyl rubber may be polymerised from iso-butylene or iso-butylene/isoprene mixtures respectively using a metallocene type catalyst. In particular, polymerization or co-polymerization takes place very rapidly under anhydrous and anaerboic conditions at temperatures between -100.degree. C. and -20.degree. C. in the presence an initiator co-initiator system comprising Cp'MXX'X"/BRR'R" in an organic solvent such as toluene, where Cp' is a .pi.-bonded cyclopentadienyl or substituted cyclopentadienyl ligand; M is selected from titanium, zirconium and hafnium; XX' and X" are the same or different anionic groups containing 1-20 nonhydrogen groups; B is boron; and R, R' and R" are the same or different anionic groups containing 1-30 nonhydrogen groups.

REFERENCES:
patent: 5272236 (1993-12-01), Lai et al.
patent: 5296433 (1994-03-01), Siedle et al.
Pellecchia et al. (1992) Makromol. Chem., Rapid Commun., 13, 265-268.

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