Process for isolation of isobutylene polymer

Details Process for isolation of isobutylene polymer Process for isolation of isobutylene polymer

1996-09-16

1998-04-14

Teskin, Fred

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

Synthetic resins

Treating polymer containing material or treating a solid...

528482, 528488, 528489, 526 90, 526135, 526145, 526146, 526147, 526237, 5263487, 5253337, 525360, 525361, 525366, 525369, 525370, C08F 608, C08F 1010

Patent

active

057392676

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a process for the isolation of an isobutylene polymer after the polymerization reaction and a process for the efficient production of an isobutylene polymer having telechelic unsaturated groups.
Among telechelic polymers, i.e., polymers having functional groups at a plurality of ends, polymers having vinyl groups at both ends are useful as starting materials for photo-setting resins, ultraviolet-curing resins, electron radiation-curing resins, sealing compounds for electronics, adhesives, modifiers, coating materials, sealing compounds for building, etc.
It is known that a functional group-terminated polymer, e.g., isobutylene polymer having at both ends a chlorine atom connected to tertiary carbon is produced by the inifer method which comprises the cationic polymerization of isobutylene in the presence of "p-DCC"! as an initiator/chain transfer agent and boron trichloride as a catalyst (U.S. Pat. No. 4,276,394).
Further, many reports have been made by Kennedy et al. that, when the foregoing cationic polymerization reaction is carried out in a solvent containing a halogenated hydrocarbon having one or two carbon atoms (e.g., methyl chloride, methylene chloride) in the presence of an electron donor, an isobutylene polymer having a small Mw/Mn value as determined by GPC, A18 (1), 25 (1982), Polym. Bull., 20, 413 (1988), Polym. Bull., 26, 305 (1991), JP-A-1-318014 (The term "JP-A" as used herein means an "unexamined published Japanese patent application") corresponding to U.S. Pat. No. 5,169,914!.
In these reactions, a Lewis acid such as BCl.sub.3, TiCl.sub.4 and AlCl.sub.3 is used as a polymerization catalyst. The cationic polymerization reaction can be terminated by adding water to the reaction system so that ligands are exchanged between the Lewis acid and water, and the Lewis acid is dissolved in water. Thus, the Lewis acid can be separated from the polymer solution by separating the water from the reaction system.
However, this process is disadvantageous in that the separation of the aqueous phase from the organic phase are difficult under certain production conditions. Accordingly, a large amount of water and metal salts are mixed in the organic phase, thus reducing the purity of the product. Further, a halogen-based organic solvent such as methylene chloride is dissolved in the aqueous solution, requiring an extremely elaborate apparatus for the disposal of waste water. With respect to BCl.sub.3 having a low boiling point (12.5.degree. C.), removal by BCl.sub.3 is extremely expensive among Lewis acids, it is impracticable as an industrial material. The inventors' object is to provide a process for separating a catalyst from a polymer without generating waste water in the cationic polymerization of isobutylene or the like in the presence of a practical Lewis acid.
In the present invention, it is also made possible to effect a ligand exchange reaction of a catalyst represented by the foregoing general formula (I) as well as a dehydrochlorination reaction at ends. The inventors have made extensive studies and, as a result, it was made possible to provide a process for the preparation of a telechelic isobutylene polymer having an unsaturated group by a more effective dehydrochlorination reaction.
The term "telechelic polymer" as used herein means a polymer terminated by the same or different functional groups which can participate in crosslinking at a plurality of ends thereof.
The inventors made extensive studies to find out a process for the isolation/purification of an isobutylene polymer requiring no water-rinsing step.
The present invention has the following constitutions:
1. A process for the isolation of an isobutylene polymer which comprises the cationic polymerization reaction in a non-aqueous system in the presence of a catalyst represented by the following general formula (I): 6; and the plurality of X may be the same or different and each represent a halogen atom or a monovalent hydrocarbon group, characterized in that the process comprises carrying out polymer

REFERENCES:
patent: 2786828 (1957-03-01), Schneider et al.
patent: 2893981 (1959-07-01), Ernst et al.
patent: 4342849 (1982-08-01), Kennedy
patent: 4587307 (1986-05-01), Bronstert et al.

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