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US 6,602,942 B1Granted
Oil-extended rubber, process for producing the same, rubber composition, and crosslinked object
AssigneeZeon Corporation
InventorTakeshi Karato
Life of this patent
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AssigneeZeon Corporation
InventorTakeshi Karato
Estimating the term…
An oil-extended rubber comprising 100 weight parts of a rubber ingredient comprising a conjugated diene rubber wherein the ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) is in the range of 1.2 to 2.2, and the conjugated diene monomer units have a vinyl bond unit content of at least 20%, and 5-100 weight parts of a process oil having a total acid value of not larger than 1.0 mgKOH/g, a pour point of not higher than 50° C. and an aromatic carbon content of at least 20%. A rubber composition comprising 100 weight parts of the above-mentioned rubber ingredients, 5-100 weight parts of the process oil and 10-200 weight parts of a reinforcing agent. This rubber composition gives a crosslinked article having high tensile strength, high abrasion resistance and reduced heat build-up, and is useful, for example, as an automobile tire material.
An oil-extended rubber comprising 100 parts by weight of a rubber ingredient comprising a conjugated diene rubber wherein the ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn), as measured by gel permeation chromatography and expressed in terms of those of polystyrene, is in the range of 1.2 to 2.2, and the conjugated diene monomer units have a vinyl bond unit content of at least 20%, and 5 to 100 parts by weight of a process oil having a total acid value of not larger than 1.0 mgKOH/g, a pour point of not higher than 50° C. and an aromatic carbon content of at least 20% as measured by the Kurtz analysis method.
A rubber composition comprising (i) 100 parts by weight of a rubber ingredient comprising a conjugated diene rubber wherein the ratio (Mw/Mn) of weight average molecular weight to number-average molecular weight (Mn), as measured by gel permeation chromatography and expressed in terms of those of polystyrene, is in the range of 1.2 to 2.2, and the conjugated diene monomer units have a vinyl bond unit content of at least 20%, (ii) 5 to 100 parts by weight of a process oil having a total acid value of not larger than 1.0 mgKOH/g, a pour point of not higher than 50° C. and an aromatic carbon content of at least 20% as measured by the Kurtz analysis method, and (iii) 10 to 200 parts by weight of a reinforcing agent.
Dependencies are inferred from the claim text.