The Goodyear & Tire Rubber Company

Nissim Calderon

Howard Allen Colvin

Kenneth Floyd Castner

Joel Muse, Jr

Kenneth W Scott

Paul Harry Sandstrom

David John Zanzig

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:

Vapor phase synthesis of cis-1, 4-Polyisoprene

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.

Vapor phase synthesis of rubbery polymers

The present invention relates to the utilization of trans 1,4-polybutadiene resin having a melting point of at least 30.degree. C. in rubber compositions. The invention, in one aspect, relates to replacing, or at least partially replacing, natural rubber with a pre-blend of trans 1,4-polybutadiene resin and synthetic cis 1,4-polyisoprene rubber. The invention particularly relates to preparation and utilization of a pre-blend of trans 1,4-polybutadiene resin and synthetic cis 1,4-polyisoprene rubber by blending individual polymerizate cements, drying the pre-blend, and use of such pre-blend in the preparation of rubber compositions and of manufactured products such as, for example, tires.

Method of preparing trans polybutadiene blend for use in tires

The invention is directed to a catalytic process where two unsaturated substances of which at least one of them is a high molecular weight polymeric material containing double bonds either along the main chain or as part of pendant side groups, are inter-reacted by means of an olefin metathesis reaction leading to the formation of new and useful polymeric materials.

Preparation of graft, block and crosslinked unsaturated polymers and

The composition is disclosed of graft and block copolymer and interpolymers comprising subjecting two dissimilar polymeric substances to catalysts capable of inducing the olefin metathesis reaction.

A method for the preparation of alicyclic ketones containing 16 carbon atoms in the ring which comprises converting an alicyclic compound possessing 8 carbon atoms in the unsaturated ring such as cyclooctenes and cyclooctadienes into alicyclic compounds which contain 16 carbon atoms in the ring and containing at least 2 carbon-to-carbon double bonds and subsequently converting at least one of the double bonds in such a compound into a carbonyl or ketone functional group is disclosed.

Process for the preparation of cyclohexadecenones and derivatives

These polymers are characterized as having a structure of polyalkenemers in which the double bonds are of the cis and trans vinyl type configuration and no double bonds are of the 1,2 type configuration. The polymers are further characterized by repeating units of

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Akron, OH, United States of America

Nissim Calderon