Resin-extended rubber composition and tire rubber compositions prepared therewith
View Patent ↗A process for the preparation of a shaped rubber composition comprising combining a rubber compound with an extender compound to produce a mixture; drying the mixture to produce a dried mixture; and shaping the mixture wherein the extender compound comprises a natural or hydrocarbon resin, which possesses a glass transition temperature of at equal to or greater than about −70° C. and an acid value of 50 mg KOH/g or less and wherein the mixture is shaped into particles or bales.
1. A process for the preparation of a shaped rubber composition comprising:
combining a rubber compound with an extender compound in an organic solvent to produce a solution;
drying the solution to produce a dried mixture; and
shaping the mixture;
wherein the extender compound comprises a natural or hydrocarbon resin having a glass transition temperature of 70° C. to about 120° C., and an acid value of 50 mg KOH/g or less,
and wherein the mixture is shaped into particles or bales.
2. The process according to claim 1 wherein the natural or hydrocarbon resin is an aliphatic hydrocarbon resin, an aromatic resin, a cyclo-aliphatic resin, a terpene resin, oligoester, rosin and/or rosin ester.
3. The process according to claim 1 wherein the natural or hydrocarbon resin is an alpha-methyl styrene resin, a terpene resin, oligoester, a rosin, a rosin ester or combinations thereof.
4. The process according to claim 1 wherein the resin is of natural origin.
5. The process according to claim 1 wherein the rubber composition is in particulate form.
6. The process according to claim 5 wherein the particulate form comprises comminuted small particles, shaped granules or flakes, or shaped blocks.
7. The process according to claim 1 wherein the natural or hydrocarbon resin has a molecular weight ranging from 400 to 2000 Dalton (M w ) and a transition glass temperature (Tg) of between −10 and 100° C.
8. The process according to claim 1 wherein the natural or hydrocarbon resin is present in an amount ranging from 1-75 phr.
9. The process according to claim 1 excluding additional extender compounds.
10. The process according to claim 1 wherein the natural or hydrocarbon resin comprises an aliphatic hydrocarbon resin.
11. The process according to claim 1 wherein the natural or hydrocarbon resin comprises an aromatic resin.
12. The process according to claim 1 wherein the natural or hydrocarbon resin comprises terpene, bicyclic terpene, monocyclic terpene, δ-2-carene, δ-3-carene, dipentene, limonene, myrcene, β-phellandrene, α-pinene, β-pinene, α-terpinene, γ-terpinene, or terpinolene.
13. The process according to claim 1 wherein the natural or hydrocarbon resin is an oligoterpene resin, a terpene hydrocarbon resin, a terpene phenolic resin, styrenated terpene or mixtures thereof.
14. The process according to claim 1 wherein the natural or hydrocarbon resin is a rosin ester.
15. The process according to claim 14 wherein the rosin ester is an ester of rosin and a polyhydric phenol.
16. The process according to claim 1 wherein the rubber compound comprises a styrene butadiene copolymer.
17. A tire rubber composition prepared by compounding the rubber composition of claim 1 with additives comprising curing aids, processing additives, fillers, pigments, reinforcing materials, or combinations thereof.
18. A shaped rubber composition obtainable by the process according to claim 1 .