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US 4,621,118 AGranted
Sulfurized guayule resin and rubber
AssigneeThe Firestone Tire & Rubber Company
InventorsWilliam W. Schloman, Jr., James A. Davis
Life of this patent
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Abstract
Guayule resin is sulfurized such that it has a high softening point of at least 70.degree. C. The sulfurized guayule resin can be utilized in association with conventional rubbers and the end results in improved properties such as reduced hysteresis loss, increased tensile strength and the like.
Claims10
A rubber composition comprising;
- a blend of a rubber and a sulfurized guayule resin having a high softening point, said guayule resin chemically treated with sulfur at a temperature of from 150.degree. C. to about 200.degree. C., the amount of said sulfur being from about 42 parts to about 900 parts by weight per 100 parts by weight of said guayule resin, said sulfurized guayule resin having a softening point of at least 70.degree. C. according to ASTM Test E28-67, the amount of said sulfurized guayule resin being an effective amount to impart reduced hysteresis loss.
Dependencies are inferred from the claim text.