Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1995-09-08
1997-03-18
Cain, Edward J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
524573, 525232, 525236, 525237, 525315, 5253319, C08F23600
Patent
active
056124368
ABSTRACT:
The subject invention discloses an isoprene-butadiene diblock rubber which is particularly valuable for use in making treads for tires which have improved wear characteristics without compromising traction characteristics or rolling resistance. Said isoprene-butadiene diblock rubber is comprised of (1) a first block which is comprised of repeat units which are derived from 1,3-butadiene and (2) a second block which is comprised of repeat units which are derived from both 1,3-butadiene and isoprene, wherein the repeat units derived from isoprene and 1,3-butadiene in the second block are in an essentially random order, wherein the diblock rubber has a glass transition temperature which is within the range of about -100.degree. C. to about -70.degree. C., and wherein the diblock rubber has a Mooney viscosity which is within the range of about 50 to about 140. In cases where the isoprene-butadiene diblock rubber of this invention is employed in automobile tires it will preferably have a second glass transition temperature which is within the range of about -50.degree. C. to about 0.degree. C. The Mooney viscosity will preferably be within the range of about 80 to about 135 and in the case of oil extended polymers will more preferably be within the range of about 100 to about 130 before oil extension.
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Austin Laurie E.
Halasa Adel F.
Hsu Wen-Liang
Sandstrom Paul H.
Zanzig David J.
Cain Edward J.
Rockhill Alvin T.
The Goodyear Tire & Rubber Company
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