Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-01-19
2000-03-28
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525314, 5253325, 525339, C08F 830, C08F29300, C08C 1900, C08C 1902
Patent
active
060433213
ABSTRACT:
Tire rubbers which are prepared by anionic polymerization are frequently coupled with a suitable coupling agent, such as a tin halide, to improve desired properties. It has been unexpectedly found that greatly improved properties for tire rubbers, such as lower hysteresis, can be attained by asymmetrically coupling the rubber. This invention more specifically discloses an asymmetrical tin-coupled rubbery polymer which is particularly valuable for use in manufacturing tire tread compounds, said asymmetrical tin-coupled rubbery polymer being comprised of a tin atom having at least three polydiene arms covalently bonded thereto, wherein at least one of said polydiene arms has a number average molecular weight of less than about 40,000, wherein at least one of said polydiene arms has a number average molecular weight of at least about 80,000, and wherein the ratio of the weight average molecular weight to the number average molecular weight of the asymmetrical tin-coupled rubbery polymer is within the range of about 2 to about 2.5.
REFERENCES:
patent: 4096203 (1978-06-01), St. Clair
patent: 5096973 (1992-03-01), Hermann et al.
patent: 5162409 (1992-11-01), Mroczkowski
patent: 5268439 (1993-12-01), Hergenrother et al.
patent: 5486573 (1996-01-01), Himes et al.
patent: 5514757 (1996-05-01), Hsu et al.
patent: 5534592 (1996-07-01), Halasa et al.
patent: 5541264 (1996-07-01), Hsu et al.
patent: 5610238 (1997-03-01), Himes et al.
patent: 5686530 (1997-11-01), Halasa et al.
Futamura Shingo
Halasa Adel Farhan
Hsu Wen-Liang
Matrana Barry Allen
Rockhill Alvin T
The Goodyear Tire & Rubber Company
Wu David W.
Zalukaeva Tanya
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