Patent ID: 11891516
Assignee: KRATON CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 11:
12. A method for preparing a tire rubber composition comprising:
providing 0-100 parts by weight (phr) of a rubber component,
providing from 5-75 phr of a dimeric decarboxylated rosin (DDCR) comprising 50-100 wt. % of polycyclic hydrocarbon compounds having one or more aliphatic, unsaturated, or aromatic groups, and 34-80 carbon atoms, having:
a molecular weight Mn of 250-900 Da, measured using gel permeation chromatography and polystyrene calibration standards;
a polydispersity index of 1.0-1.35; and
an oxygen to carbon ratio of <5%;
wherein the DDCR is formed by decarboxylating a dimeric rosin acid or by dimerizing a decarboxylated rosin;

providing from 50-200 phr of a filler, and optionally up to 75 phr of a plasticizer;
mixing the rubber component, the DDCR resin, the filler, and the optional plasticizer to form a mixture;
kneading the mixture; and
incorporating a cross-linking system into the kneaded mixture to form the tire rubber composition.