Process for producing unsaturated group-terminated isobutylene p

Details Process for producing unsaturated group-terminated isobutylene p Process for producing unsaturated group-terminated isobutylene p

1996-06-27

1998-09-22

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526135, 526146, 526147, 526194, 526204, 526209, 526210, 526212, 526217, 526220, 526221, 526222, 526237, 5263487, 525267, 525270, 525288, 525918, 528501, C08F 206, C08F 1010

Patent

active

058115013

ABSTRACT:
The present invention provides a novel halogen-free solvent system which can produce a good isobutylene polymer and can be easily reused. A novel process for the production of an isobutylene polymer is provided which comprises using a hydrocarbon solvent having a boiling point of not lower than 105.degree. C. and a melting point of not higher than -90.degree. C. Heretofore, a solvent system containing a halogenated hydrocarbon such as methylene chloride has been used for the production of an isobutylene polymer. However, such a solvent system has a great adverse effect on the environment. Therefore, a non-halogenated solvent is desirable. The present invention is characterized by the use of a hydrocarbon solvent as a reaction solvent. The resulting polymer has good properties. Further, compounds which are produced as by-products during the reaction can be easily removed, enabling the recycling of the solvent used. Thus, the production cost can be reduced.

REFERENCES:
patent: 3493549 (1970-02-01), Uemura et al.
patent: 5247021 (1993-09-01), Fujisawa et al.
patent: 5527870 (1996-06-01), Maeda et al.

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