Vapor phase synthesis of rubbery polymers

Details Vapor phase synthesis of rubbery polymers Vapor phase synthesis of rubbery polymers

1997-12-15

1999-01-12

Teskin, Fred

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

Synthetic resins

Polymerizing in tubular or loop reactor

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

Patent

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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