Sulfur-crosslinkable rubber mixture
A sulfur-crosslinkable rubber mixture which, for improved abrasion characteristics with no significant deterioration in rolling resistance and in wet grip, comprises at least one functionalized diene rubber, the functionalization of which is along the polymer chain and/or at the end and enables attachment to fillers, the diene rubber having a glass transition temperature T g of −110 to −15° C., at least one aliphatic and/or aromatic hydrocarbon resin with a softening point (ring and ball to ASTM E 28) of 50 to 150° C. and a mean molecular weight M n of 200 to 2000 g/mol, and a polydispersity D=M w /M n of 1 to 5, and at least one filler.
1. A sulfur-crosslinkable rubber mixture, comprising
at least one functionalized diene rubber, the functionalization of which is present along the polymer chain and/or at the end, and permits coupling to fillers, where the glass transition temperature (T g ) of the diene rubber is from −110 to −15° C.,
at least one aliphatic and/or aromatic hydrocarbon resin with a softening point (ring and ball in accordance with ASTM E28) of from 50 to 150° C. and with an average molar mass (M n ) of from 200 to 2000 g/mol, and also with a polydispersity D=M w /M n of from 1 to 5, wherein the aliphatic and/or aromatic hydrocarbon resin is selected from the group consisting of terpene resins, C 5 -resins, C 9 -resins, cumarone-indene resins, and dicyclopentadiene (DCPD) resins, aromatic resin produced from α-methylstyrene, and copolymers of the monomers of said resin types and
at least one filler.
2. The rubber mixture as claimed in claim 1 , wherein the functionalized diene rubber(s) is/are functionalized solution-polymerized styrene-butadiene copolymer(s) (SSBR).
3. The rubber mixture as claimed in claim 1 , wherein the rubber mixture comprises from 10 to 100 phr of the functionalized diene rubber(s).
4. The rubber mixture as claimed in claim 1 , further comprising at least two diene rubbers of which at least one has been functionalized, where the glass transition temperature (T g ) of one diene rubber is from −50 to −15° C. and the glass transition temperature (T g ) of another diene rubber is from −110 to −50° C.
5. The rubber mixture as claimed in claim 4 , wherein the diene rubber with glass transition temperature (T g ) of from −50 to −15° C. is functionalized.
6. The rubber mixture as claimed in claim 4 , wherein the diene rubber with glass transition temperature (T g ) of from −110 to −50° C. is functionalized.
7. The rubber mixture as claimed in claim 1 , wherein the rubber mixture comprises a polar filler, and the functionalized diene rubber has been functionalized with at least one group selected from the group consisting of hydroxy, carboxy, amino, phthalocyanine, epoxy, silyl, silanol, siloxane, and aminosiloxane groups.
8. The rubber mixture as claimed in claim 1 , wherein the aliphatic and/or aromatic hydrocarbon resin is a C 5 -resin.
9. The rubber mixture as claimed in claim 1 , further comprising from 5 to 50 phr of aliphatic and/or aromatic hydrocarbon resin.
10. The rubber mixture as claimed in claim 7 , further comprising from 10 to 150 phr of silica.
11. A tire of which the tread is composed at least to some extent of a sulfur-vulcanized rubber mixture as claimed in claim 1 .
12. The rubber mixture as claimed in claim 1 , wherein the rubber mixture comprises from 30 to 100 phr of the functionalized diene rubber(s).
13. The rubber mixture as claimed in claim 1 , further comprising from 10 to 30 phr of aliphatic and/or aromatic hydrocarbon resin.