Tire composition and method for making thereof
The disclosure relates to a composition for use in tires. The rubber composition comprises a blend of a rubber component and based on 100 parts by weight (phr) of the rubber component, from 50 to 200 phr of a filler, from 0 to 25 phr of a plasticizer, and from 5 to 90 phr dimeric decarboxylated rosin (DDCR). The DDCR resin comprises 50 to 100 wt. % of polycyclic hydrocarbon compounds having one or more aliphatic, unsaturated, or aromatic groups, and 34-80 carbon atoms, with a molecular weight M n of 250-900 Da, a polydispersity index of 1.0-1.35, and an oxygen to carbon ratio of <5%.
1. A rubber composition comprising a blend of:
a rubber component and based on 100 parts by weight (phr) of the rubber component;
from 50 to 200 phr of a filler;
from 0 to 25 phr of a plasticizer;
from 5 to 90 phr dimeric decarboxylated rosin (DDCR) resin comprising 50 to 100 wt. % of polycyclic hydrocarbon compounds having one or more aliphatic, unsaturated or aromatic groups, and 34-80 carbon atoms;
wherein the DDCR has:
a molecular weight M n 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.
2. The rubber composition of claim 1 , wherein the DDCR resin is characterized as having one or more of:
an acid value of <80 mg KOH/g, measured using ASTM D 465;
a flash point of >150° C. per ASTM D 92;
a ring and ball softening point (Tsp) from >30° C., per ASTM E28-18;
a Brookfield viscosity of 15-1000 mPa·s, at 177° C. ASTM D2196;
a glass transition temperature (Tg) of −20-110° C., per ASTM E1356;
a density of 1.00-1.05 g/cm 3 per ASTM D792-13;
a T g /M n (K/Da) ratio of >0.6; and
a cloud point in polyolefins of <70° C.
3. The rubber composition of claim 1 , wherein the DDCR resin comprises dimeric and trimer species, with a sum of the dimer and trimer species of >=75 wt. %.
4. The rubber composition of claim 1 , wherein the DDCR resin comprises >=50 wt. % dimeric species, and remainder monomeric, trimeric, and larger polymeric species.
5. The rubber composition of claim 1 , wherein the DDCR resin comprises >=50 wt. % trimeric species, and remainder monomeric, dimeric, and larger polymeric species.
6. The rubber composition of claim 1 , wherein the DDCR resin has a polydispersity index (PDI) (GPC) of 1.05-1.2.
7. The rubber composition of claim 1 , wherein the DDCR resin has a T g /M n ratio (K/Da) of 0.6-1.0.
8. The rubber composition of claim 1 , wherein the DDCR resin has an oxygen content ratio of <3%.
9. The rubber composition of claim 1 , wherein the DDCR resin has an acid value of <50 mg KOH/g.
10. The rubber composition of claim 1 , wherein the DDCR resin is unhydrogenated, partially hydrogenated or fully hydrogenated.
11. The rubber composition of claim 1 , wherein the rubber composition is extruded, compression molded, injection molded, or laminated into a molded rubber part.
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 M n 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.
13. The method of claim 12 , wherein the DDCR resin is characterized as having one or more of:
an acid value of <80 mg KOH/g, measured using ASTM D 465;
a flash point of >150° C. per ASTM D 92;
a ring and ball softening point (T sp ) from >30° C., per ASTM E28-18;
a Brookfield viscosity of 15-1000 mPa·s, at 177° C. ASTM D2196;
a glass transition temperature (Tg) of −20-110° C., per ASTM E1356;
a density of 1.00-1.05 g/cm 3 per ASTM D792-13;
a T g /M n (K/Da) ratio of >0.6; and
a cloud point in polyolefins of <70° C.
14. The method of claim 12 , wherein the DDCR resin comprises dimeric and trimer species, with a sum of the dimer and trimer species of >=75 wt. %.
15. The method of claim 12 , wherein the DDCR resin comprises a sum of dimeric and trimeric species of >=75 wt. %.
16. The method of claim 12 , wherein the DDCR resin has a polydispersity index (PDI) (GPC) of 1.05-1.15.
17. The method of claim 12 , wherein the DDCR resin has a T g /M n ratio (K/Da) of 0.6-1.0.
18. The method of claim 12 , wherein the DDCR resin has an oxygen content ratio of <3%.
19. The method of claim 12 , wherein the DDCR resin has an acid value of <50 mg KOH/g.
20. The method of claim 12 , wherein the DDCR resin is unhydrogenated, partially hydrogenated or fully hydrogenated.