Azodicarboxy additives for rubber compositions
AssigneeBridgestone Corporation
InventorsArif O. Gozen, Christopher G. Robertson, William L. Hergenrother
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Abstract
A polymeric composition includes a diene elastomer; an azodicarboxy compound; and a reinforcing filler comprising silica. The composition is not foamed. A method for preparing a polymeric composition includes mixing in one or more steps: a diene elastomer; an azodicarboxy compound; and a reinforcing filler. The mixing temperature is less than 160° C. in mixing steps in which the azodicarboxy compound is present. In an embodiment, the mixing temperature is kept below the decomposition temperature of the azodicarboxy compound.
Claims14
A composition comprising:
- a diene elastomer;
- an azodicarboxy compound;
- and
- a reinforcing filler comprising silica;
- wherein the composition is cured and not foamed;
- wherein the composition does not include a reinforcing carbon black filler;
- wherein the azodicarboxy compound has the structure of formula I:
- wherein R1 and R2 are independently selected from OH, NH2, NHR3, NR32, OR3, where R3 is a branched or linear alkyl, aryl, or akylaryl group having 1 to 16 carbon atoms.
A cured composition comprising:
- a diene elastomer selected from the group consisting of:
- natural rubber, polyisoprene rubber, styrene butadiene rubber, polybutadiene rubber, poly(isoprene-styrene), poly(isoprene-butadiene), poly(isoprene-styrene-butadiene), neoprene, ethylene-propylene-diene rubber (EPDM), and acrylonitrile-butadiene rubber (NBR);
- about 0.1 to about 20 phr of an azodicarboxy compound having the structure of formula I:
- wherein R1 and R2 are independently selected from OH, NH2, NHR3, NR32, OR3, where R3 is a branched or linear alkyl, aryl, or akylaryl group having 1 to 16 carbon atoms;
- about 2 to about 70 phr of oil;
- about 0.1 to about 10 phr of zinc oxide or zinc stearate;
- and
- a reinforcing filler comprising about 1 to about 100 phr of silica and a total amount of reinforcing filler does not exceed about 100 phr, wherein the composition is not foamed.
A molded and cured tire tread comprising:
- a diene elastomer selected from the group consisting of:
- natural rubber, polyisoprene rubber, styrene butadiene rubber, polybutadiene rubber, poly(isoprene-styrene), poly(isoprene-butadiene), and poly(isoprene-styrene-butadiene);
- about 0.1 to about 20 phr of an azodicarboxy compound;
- about 0.1 to about 10 phr of zinc oxide or zinc stearate;
- and
- a reinforcing filler comprising about 1 to about 100 phr of silica and a total amount of reinforcing filler does not exceed about 100 phr;
- wherein the tire tread is not foamed.
Dependencies are inferred from the claim text.