Tire composition and method for making thereof
AssigneeKraton Corporation
InventorsWolfgang Pille-Wolf, Jochem H. W. Vervelde, Jeremie Pichereau, Mark C Schaapman
Life of this patent
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Abstract
The disclosure relates to tire tread compositions and methods for making. The compositions include a rubber, a rosin ester resin and at least one filler. The rosin ester resin is characterized as having a PAN number of less than 25, an acid number less than 20, a hydroxyl number of less than 30, a combined acid number and hydroxyl value of less than 50. The tire tread composition has a wet grip resistance to rolling resistance indicator ratio ((tan δ at 0° C.)/tan δ at 60° C.) higher than a tire tread composition containing a comparable amount of a rosin ester having a combined acid number and hydroxyl value of more than 50.
Claims19
A tire tread composition comprising a blend of:
- a rubber component, and based on 100 parts by weight (phr) of the rubber component;
- from 5 to 75 phr of a rosin ester resin having a PAN number of less than 25, an acid number of less than 20, a hydroxyl value of less than 30, a combined acid number and hydroxyl value of less than 50, a softening point (Tsp) of 60° C. to 170° C.;
- and a weight average molecular weight Mw of 700-1500 Da;
- from 30 to 200 phr of a filler;
- from 0 to 75 phr of a plasticizer;
- and
- wherein the tire tread composition has an increase in rolling resistance indicator (Tan δ at 60° C.) of less than 3%, and a decrease in wet grip indicator (Tan δ at 0° C.) of less than 1% after the resin is stored for 10-12 months at room temperature.
A method for preparing a tire tread composition comprising:
- providing 0-100 parts by weight (phr) of a rubber component,
- providing from 5 to 75 phr of a rosin ester resin having a PAN number of less than 25, an acid number of less than 20, a hydroxyl value of less than 30, a combined acid number and hydroxyl value of less than 50, a softening point (Tsp) of 60° C. to 170° C.;
- and a weight average molecular weight Mw of 700-1500 Da;
- providing from 50 to 200 phr of a filler, and optionally up to 75 phr of a plasticizer;
- mixing the rubber component, the rosin ester resin, the filler, and the optional plasticizer to form a mixture;
- kneading the mixture;
- incorporating a cross-linking system into the kneaded mixture to form the tire tread composition;
- and
- wherein the tire tread composition has an increase in rolling resistance indicator (Tan δ at 60° C.) of less than 3%, and a decrease in wet grip indicator (Tan δ at 0° C.) of less than 1% after the resin is stored for 10-12 months at room temperature.
Dependencies are inferred from the claim text.