Process for producing modified polymer rubber

Details Process for producing modified polymer rubber Process for producing modified polymer rubber

2003-03-20

2004-10-19

Seidleck, James J. (Department: 1711)

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S250000, C525S331100, C526S258000, C526S259000, C526S260000, C526S261000, C526S262000, C526S263000, C526S264000, C526S265000

Reexamination Certificate

active

06806321

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a process for producing a modified polymer rubber having superior impact resilience, which modified polymer rubber is accordingly capable of producing motorcar tires having superior fuel cost saving.
BACKGROUND OF THE INVENTION
A styrene-butadiene copolymer obtained by emulsion polymerization is known as rubber used for motorcar tires. However, said copolymer has a problem that motorcar tires comprising said copolymer are not satisfactory from a view point of fuel cost saving, because the copolymer does not have sufficient impact resilience.
In order to obtain rubber having superior impact resilience, JP-B 5-46365 discloses a process, which comprises copolymerizing butadiene and styrene in a hydrocarbon solvent using an organolithium compound as an initiator, and a Lewis base such as ether as a microstructure controlling agent.
Further, Japanese Patent No. 2540901 proposes a process, which comprises reacting an alkali metal, which is bound at the end of a diene polymer rubber, with a specific acrylamide to obtain a modified diene polymer rubber having improved impact resilience.
However, recently, a level of a demand for fuel cost saving of motorcar tires is higher from an environmental view, and therefore, any of the above-mentioned copolymer rubbers can hardly meet such a demand.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a process for producing a modified polymer rubber having superior impact resilience.
The present invention provides a process for producing a modified polymer rubber, which comprises the steps of:
(1) polymerizing a conjugated diene monomer, or the conjugated diene monomer and an aromatic vinyl monomer in the presence of an alkali metal catalyst in a hydrocarbon solvent to produce an active polymer having an alkali metal at its end(s), and
(2) reacting the active polymer with a ketone compound represented by the following formula (1) to produce a modified polymer rubber,
wherein R
1
is an alkyl group, an alkoxy group, a phenyl group or a benzyl group having 1 to 8 carbon atoms; and R
2
is an N-substituted cyclic amino group.


REFERENCES:
patent: 3244664 (1966-04-01), Zelinski et al.
patent: 4535052 (1985-08-01), Anderson et al.
patent: 0 334 042 (1989-09-01), None
patent: 0 493 364 (1992-07-01), None
patent: 5-46365 (1993-07-01), None
patent: 5-202102 (1993-08-01), None
patent: 2540901 (1996-07-01), None

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