Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2008-10-09
2010-11-02
Cano, Milton I (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S177000, C526S178000, C502S153000, C502S154000
Reexamination Certificate
active
07825202
ABSTRACT:
The present invention is directed to a catalyst system for synthesizing rubbery polymers, such as styrene-butadiene rubber, that can be utilized in tire tread rubbers. The catalyst system, in one embodiment, includes an organolithium compound and a potassium alkyl borohydride or potassium alkyl aluminum hydride defined by: (R)3A−(H)K+, wherein A is boron or aluminum, H is hydrogen, K is potassium, and R, which is the same or different, is either H, a C1-C10alkyl, a C3-C10cycloalkyl, phenyl, or phenyl substituted C1-C10alkyl, or a C3-C10cycloalkyl, with the proviso that at least one R is a C1-C10alkyl, and further wherein any two R's may optionally be part of a carbocyclic ring. The rubbery polymers can have low to medium vinyl microstructure content, i.e., from about 10% to about 40%, and are useful in tire tread rubber compounds which can exhibit improved wear and tear characteristics.
REFERENCES:
patent: 3294768 (1966-12-01), Wofford
patent: 3669943 (1972-06-01), Komatsu et al.
patent: 3759919 (1973-09-01), Dillenschneider
patent: 3944528 (1976-03-01), Loveless
patent: 4139690 (1979-02-01), Torigoe et al.
patent: 4396743 (1983-08-01), Fujimaki et al.
patent: 4433109 (1984-02-01), Takeuchi et al.
patent: 4435312 (1984-03-01), Lecolier et al.
patent: 4485205 (1984-11-01), Fujimaki et al.
patent: 4575534 (1986-03-01), Oshima et al.
patent: 4624296 (1986-11-01), Takiguchi
patent: 4914147 (1990-04-01), Mouri et al.
patent: 5432232 (1995-07-01), Hattori et al.
patent: 5496883 (1996-03-01), Hamada
patent: 5527860 (1996-06-01), Yamakawa et al.
patent: 6103842 (2000-08-01), Halasa et al.
patent: 6127472 (2000-10-01), Kobayashi et al.
patent: 6329459 (2001-12-01), Kang et al.
patent: 6344518 (2002-02-01), Kobayashi et al.
patent: 6362272 (2002-03-01), Tadaki et al.
patent: 6472464 (2002-10-01), Morita et al.
patent: 6518350 (2003-02-01), Kobayashi et al.
patent: 6583244 (2003-06-01), Jasiunas et al.
patent: 6716925 (2004-04-01), Jacoby et al.
patent: 6844080 (2005-01-01), Kneafsey et al.
patent: 6992156 (2006-01-01), Parker et al.
patent: 7064171 (2006-06-01), Halasa et al.
patent: 7101941 (2006-09-01), Desbois et al.
patent: 7342070 (2008-03-01), Tsukimawashi et al.
patent: 2002/0132929 (2002-09-01), Weydert et al.
patent: 2003/0125468 (2003-07-01), Thielen et al.
patent: 2006/0052506 (2006-03-01), Aoki
Halasa Adel Farhan
Hsu Wen-Liang
Hsu, legal representative Leh-Yeh
Zuppo, III John Robert
Cano Milton I
Fink Brieann R
The Goodyear Tire & Rubber Company
Wood Herron & Evans L.L.P.
LandOfFree
Potassium based catalyst systems for synthesizing rubbery... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Potassium based catalyst systems for synthesizing rubbery..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Potassium based catalyst systems for synthesizing rubbery... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4170423