Tire having tread of specified rubber composition and related methods
View Patent ↗Disclosed herein are tires having a tread with improved stiffness made from a rubber composition of specified ingredients including an elastomer component, a resin component including a terpene phenol resin having a specified hydroxyl value and a DCPD-based resin, a filler component including reinforcing silica filler and carbon black, optionally a liquid plasticizer, and a cure package. Also disclosed are methods for improving the stiffness of a tire tread by using a resin component comprising a terpene phenol resin having a specified hydroxyl value and a DCPD-based resin in a rubber composition comprising an elastomer component, a filler component including reinforcing silica filler and carbon black, optionally a liquid plasticizer, and a cure package.
1 . A tire comprising a tread made from a rubber composition comprising:
100 parts of an elastomer component including at least one rubber selected from the group consisting of styrene-butadiene copolymer, polybutadiene, natural rubber, and polyisoprene, wherein the elastomer component includes more than 60 parts of polybutadiene having a cis-bond content of at least 95% and a Tg of less than −101° C.,
20 to 60 phr of a resin component comprising (i) a terpene phenol resin having a hydroxyl value of 80 or greater and (ii) a DCPD-based resin that is not hydrogenated and that has a minority by weight of DCPD monomers, wherein the terpene phenol resin (i) comprises a majority by weight of the resin component,
a filler component comprising
91 to 140 phr of a reinforcing silica filler, and
1 to 20 phr of a carbon black filler,
wherein the filler component contains 0 phr of titanium oxide,
0 to 30 phr of a liquid plasticizer, and
a cure package.
2 . The tire of claim 1 , wherein the terpene phenol resin is present in an amount of 19-50 phr.
3 . The tire of claim 1 , wherein the reinforcing silica filler has a BET surface area of about 140 to about 230 m 2 /g.
4 . The tire of claim 1 , wherein the reinforcing silica filler has a BET surface area of about 100 to about 140 m 2 /g.
5 . The tire of claim 1 , wherein the elastomer component includes at least 70 parts of polybutadiene having a cis-bond content of at least 95% and a Tg of less than −101° C.
6 . The tire of claim 1 , wherein the elastomer component includes at least 20 phr of styrene-butadiene having a silica-reactive functional group.
7 . The tire of claim 1 , wherein the rubber composition of the tread includes 10-40 phr of liquid plasticizer.
8 . The tire of claim 1 , wherein the elastomer component includes a styrene-butadiene copolymer having a Tg of about −70 to about −50° C.
9 . The tire of claim 1 , wherein the filler component includes no more than 10 phr of reinforcing carbon black filler.
10 . The tire of claim 1 , wherein the tread rubber composition has
a wet performance as measured by tan 6 at 0° C. of at least 0.45, and
a stiffness as measured by E′ at 30° C. of at least 14.
11 . A tire comprising a tread made from a tread rubber composition comprising
100 parts of an elastomer component including at least one rubber selected from the group consisting of styrene-butadiene copolymer, polybutadiene, natural rubber, and polyisoprene, wherein more than 60 parts of the elastomer component comprises polybutadiene having a cis-bond content of at least 95% and a Tg of less than −101° C.,
20 to 60 phr of a resin component comprising (i) a terpene phenol resin having a hydroxyl value of 80 or greater and (ii) a DCPD-based resin that is not hydrogenated and that has a minority by weight of DCPD monomers, wherein the terpene phenol resin (i) comprises a majority by weight of the resin component,
a filler component comprising
91 to 140 phr of a reinforcing silica filler, and
1 to 20 phr of a carbon black filler,
wherein the filler component contains 0 phr of titanium oxide,
0 to 30 phr of a liquid plasticizer, and
a cure package.
12 . The tire of claim 11 , wherein the tread rubber composition has a rolling resistance as measured by tan 6 at 60° C. of no more than 0.4.
13 . The tire of claim 11 , wherein the terpene phenol resin is present in an amount of 20-50 phr.
14 . The tire of claim 11 , wherein the elastomer component includes a styrene-butadiene copolymer having a Tg of about −65 to about −40° C.
15 . The tire of claim 11 , wherein the tread rubber composition has
a wet performance as measured by tan 6 at 0° C. of at least 0.45, and
a stiffness as measured by E′ at 30° C. of at least 14.
16 . The tire of claim 11 , wherein the elastomer component includes a styrene-butadiene copolymer having a Tg of about −70 to about −50° C.
17 . The tire of claim 1 , wherein the carbon black filler is reinforcing and the filler component includes no more than 5 phr of additional reinforcing filler.
18 . The tire of claim 11 , wherein the carbon black filler is reinforcing and the filler component includes no more than 5 phr of additional reinforcing filler.