Process for the synthesis of styrene-isoprene rubber

Details Process for the synthesis of styrene-isoprene rubber Process for the synthesis of styrene-isoprene rubber

1993-03-29

1994-10-25

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526173, 526204, 526340, C08F 206, C08F 448, C08F23610

Patent

active

053590163

ABSTRACT:
The subject invention relates to a technique for synthesizing rubbery copolymers of styrene and isoprene. These rubbery copolymers exhibit an excellent combination of properties for utilization in tire tread rubber compounds. By utilizing these styrene-isoprene rubbers in tire treads, tires having improved wet skid resistance can be built without sacrificing rolling resistance or tread wear characteristics. This invention more specifically discloses a process for the synthesis of styrene-isoprene rubbers which comprises copolymerizing isoprene monomer and styrene monomer in an organic solvent in the presence of a catalyst system which is comprised of (a) a lithium initiator and (b) an alkyl tetrahydrofurfuryl ether modifier, wherein the molar ratio of the modifier to the lithitium initiator is within the range of 2:1 to 40:1. The subject invention further discloses a process for the synthesis of styrene-isoprene rubbers which comprises copolymerizing isoprene monomer and styrene monomer in an organic solvent in the presence of a catalyst system which is comprised of (a) a lithium initiator and (b) 2,2-ditetrahydrofurylpropane as a modifier, wherein the molar ratio of the modifier to the lithium initiator is within the range of 1:1 to 40:1.

REFERENCES:
patent: 3847883 (1974-11-01), Kamienski et al.
patent: 4367325 (1983-01-01), Takeuchi et al.
patent: 4429091 (1984-01-01), Hall
patent: 4696986 (1987-09-01), Halasa et al.
patent: 5137998 (1992-08-01), Hsu et al.
patent: 5173550 (1992-12-01), Hsu et al.
patent: 5231153 (1993-07-01), Hsu et al.
Hackh's Chemical Dictionary (4th ed.) McGraw-Hill Ca, N.Y., 286 (1969).
United States Patent Application Ser. No. 07,864,264, filed Apr. 6, 1992 of Wen-Liang Hsu, Adel Farhan Halasa and Barry Allen Matrana for Anionic Polymerization Modifier, pending in Art Unit 1505.

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