VEHICLE TIRES HAVING COATED TREAD
Vehicle tires, particularly for commercial vehicles, contain a profiled tread, which is broken down into profiled ribs or block rows by a number of peripheral grooves and is made of a first rubber mixture. A groove base of the peripheral grooves is made of a second rubber mixture, and the modulus of elasticity of the second rubber mixture is less than the modulus of elasticity of the first rubber mixture of the main part of the tread. In particular, the second rubber mixture has a modulus M 100%, which is 5% to 20% less than the modulus M 100% of the first rubber mixture of the main part of the tread. The two rubber mixtures are based on a substantially identical or comparable polymer system.
1 . A pneumatic vehicle tire, comprising:
a profiled tread having a number of circumferential grooves each with a groove base formed therein, said circumferential grooves dividing said profiled tread into one of profile ribs and block series, said profiled tread having a main part composed of a first rubber mixture and rubber layers composed of a second rubber mixture lining at least said groove base of said circumferential grooves, a modulus of elasticity of said second rubber mixture of said rubber layers being less than a modulus of elasticity of said first rubber mixture of said main part of said profiled tread, said second rubber mixture of said rubber layers has a modulus M 100% which is 5% to 20% lower than the modulus M 100% of said first rubber mixture of said main part of said profiled tread, and said first and second rubber mixtures are based on a substantially corresponding or comparable polymer system.
2 . The pneumatic vehicle tire according to claim 1 , wherein said second rubber mixture of said rubber layers and said first rubber mixture of said main part have a substantially corresponding or comparable filler system.
3 . The pneumatic vehicle tire according to claim 1 , wherein the modulus M 100% of said second rubber mixture of said rubber layers is 10 to 15% lower than that of said first rubber mixture of said main part of said profiled tread.
4 . The pneumatic vehicle tire according to claim 1 , wherein said second rubber mixture for said rubber layers and said first rubber mixture for said main part are based on at least one rubber selected from the group consisting of SBR, BR, NR/IR, and proportions of said rubbers in one rubber mixture differ from proportions of said rubbers in the other rubber mixture by at most 6 phr per rubber.
5 . The pneumatic vehicle tire according to claim 1 , wherein said second rubber mixture of said rubber layers and said first rubber mixture of said main part contain at least one of carbon black and silica as fillers, a proportion of said carbon black and said silica in said second rubber mixture of said rubber layers differing from a proportion of said carbon black and said silica in said rubber mixture of said main part by at most 6 phr per filler.
6 . The pneumatic vehicle tire according to claim 1 , wherein said second rubber mixture of said rubber layers and said first rubber mixture of said main part contain at least one of carbon black and silica as a filler, a dibutyl phthalate (DBP) number or an iodine absorption number of said fillers in said second rubber mixture of said rubber layers differing from those in said first rubber mixture of said main part by not more than 15%.
7 . The pneumatic vehicle tire according to claim 1 , wherein said rubber layers have a maximum thickness at said groove base of 4 mm.
8 . The pneumatic vehicle tire according to claim 1 , wherein said circumferential grooves have groove flanks and said rubber layers have a maximum thickness on said groove flanks of 6 mm.
9 . The pneumatic vehicle tire according to claim 1 , wherein the pneumatic vehicle tire is for commercial vehicles.