AUTO TIRE Russian patent published in 2011 - IPC B60C1/00 C08L7/00 C08L9/00 C08L21/00 C08K3/04 C08K3/36 

FIELD: transport.

SUBSTANCE: invention relates to automotive industry. Tire comprises side strip, carcass and crimp section Side strip is made from rubber mix (A) including rubber components (A) including (a1): 35 to 65 wt % of natural rubber and/or isoprene rubber, (a2): 15 to 55 wt % of butadiene rubber modified by tin or S-butadiene rubber and (a3): 0 to 50 wt % of butadiene rubber including syndiotactic crystals, epoxy natural rubber or modified butadiene-styrene rubber; 20 to 40 wt % of filler (A2). Filler is selected from group consisting of carbon black, silicon dioxide and calcium carbonate, or combination thereof per 100 wt % (A1). Rubber mix (A) also comprises vulcanising agent. Note here that complex elastic modulus E* varies from 2.0 to 3.5 MPa and tan δ makes less than 0.12. Rubber mix to cover carcass cord (B) comprises rubber component (B1), comprising (b1): 50 to 80 wt % of natural rubber and/or isoprene rubber, (b2): 20 to 45 wt % of diene rubber selected from modified butadiene-styrene rubber bonded with tin or silicon, modified butadiene-styrene rubber containing primary amino group or alkoxysilyl group modified by tin or S-modified butadiene rubber and epoxy natural rubber. Note here that amount of bound styrene makes 5-30 wt %. Rubber mix (B) also comprises 20-40 wt % of filler per 100 wt % of B1 and vulcanizing agent. Rubber mix for crimp section (C) contains rubber component (C1) containing 30-50 wt % of natural and/or isoprene rubber, 15-70 wt % of tin- or S-modified butadiene rubber, and 0-55 wt % of butadiene rubber including syndiotactic crystals, and 35-80 wt % of filler per 100 wt % of C1, and vulcanising agent. Complex elastic modulus E* of rubber mix (C1) varies from 4.5 to 9.0 MPa and tan δ makes less than 0.12.

EFFECT: low rolling resistance and higher strength.

4 cl, 5 tbl, 48 ex