Vapor phase synthesis of rubbery polymers

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in tubular or loop reactor

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526 68, 526 69, 526 88, 526129, 526133, 526137, 526141, 526142, 5261691, 5263402, 5263404, 526901, 526903, 524722, 524741, 524856, C08F 234, C08F13606, C08F13608

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active

058591567

ABSTRACT:
By utilizing the vapor phase polymerization techniques of the present invention, numerous distinct and highly beneficial advantages are realized. For instance, cis-1,4-polyisoprene rubber and high cis-1,4-polybutadiene rubber having a consistent and controllable molecular weight can be easily and practically prepared without utilizing a solvent. The subject invention more specifically discloses a method for vapor phase polymerizing isoprene into cis-1,4-polyisoprene in a process comprising the steps of:
(1) charging into a reaction zone said isoprene and a preformed catalyst system which is made by reacting an organoaluminum compound with titanium tetrachloride, preferably in the presence of at least one ether; wherein the isoprene is maintained in the vapor phase in said reaction zone by a suitable combination of temperature and pressure;
(2) allowing said isoprene to polymerize into cis-1,4-polyisoprene in said reaction zone at a temperature within the range of about 0.degree. C. to about 100.degree. C. in the presence of a diarylamine, wherein said reaction zone is a horizontal, stirred reactor of substantially circular cross section containing a centrally-located drive shaft extending longitudinally through said reactor to which are attached a plurality of adjacently located paddles, which paddles cause essentially no forward or backward movement of the cis-1,4-polyisoprene contained in said reactor; and
(3) withdrawing said cis-1,4-polyisoprene from said reaction zone.

REFERENCES:
patent: 3047559 (1962-07-01), Mayor et al.
patent: 4155880 (1979-05-01), Throckmorton et al.
patent: 5652304 (1997-07-01), Calderon et al.

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