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US 4,843,120 AGranted
Rubber composition
AssigneeThe Goodyear Tire & Rubber Company
InventorsAdel F. Halasa, Bill B. Gross, Joel L. Cox, George F. Balogh
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AssigneeThe Goodyear Tire & Rubber Company
InventorsAdel F. Halasa, Bill B. Gross, Joel L. Cox, George F. Balogh
Estimating the term…
It has been determined that certain rubbery polymers having multiple glass transition temperatures can be utilized in making tires which have improved rolling resistance, improved wet skid resistance, and outstanding tread wear. These rubbery polymers are derived from at least one conjugated diolefin monomer, have a first glass transition temperature which is between -110.degree. C. and -20.degree. C. and have a second glass transition temperature which is between -50.degree. C. and 0.degree. C. These rubber polymers can be homopolymers of conjugated diolefin monomers, copolymers of more than one conjugated diolefin monomer, or copolymers derived from at least one conjugated diolefin monomer and at least one vinyl aromatic monomer.
A rubbery polymer which has an excellent combination of properties for use in making tire treads which is comprised of repeat units which are derived from at least one conjugated diolefin monomer, wherein the rubbery polymer has a first glass transition temperature which is between -110.degree. C. and -65.degree. C. and a second glass transition temperature which is between -35.degree. C. and 0.degree. C.
A process for preparing a rubbery polymer which exhibits multiple glass transition temperatures and which has an excellent combination of properties for use in making tire treads, which comprises polymerizing at least one conjugated diolefin monomer in a first reaction zone at a temperature and under conditions sufficient to produce a first polymeric segment having a glass transition temperature which is between -110.degree. C. and -20.degree. C. and subsequently continuing said polymerization in a second reaction zone at a temperature and under conditions sufficient to produce a second polymeric segment having a glass transition temperature which is between -50.degree. C. and 0.degree. C.;
Dependencies are inferred from the claim text.