US 12,448,499 B2
Tyre for vehicle wheels
Davide Dall'Abaco, Milan (IT); Luigia Rossiello, Milan (IT); Marco Pozzoli, Milan (IT); and Davide Lupo Conti, Rome, GA (US)
Assigned to PIRELLI TYRE S.p.A., Milan (IT)
Appl. No. 17/271,065
Filed by Pirelli Tyre S.p.A., Milan (IT)
PCT Filed Aug. 29, 2019, PCT No. PCT/IB2019/057291
§ 371(c)(1), (2) Date Feb. 24, 2021,
PCT Pub. No. WO2020/044283, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 102018000008241 (IT), filed on Aug. 30, 2018.
Prior Publication US 2021/0324180 A1, Oct. 21, 2021
Int. Cl. B60C 1/00 (2006.01); B29D 30/72 (2006.01); B60C 13/00 (2006.01); B60C 13/04 (2006.01); C08L 7/00 (2006.01); C08L 9/00 (2006.01); C08L 15/02 (2006.01)
CPC C08L 7/00 (2013.01) [B29D 30/72 (2013.01); B60C 1/0025 (2013.01); B60C 13/001 (2013.01); C08L 9/00 (2013.01); C08L 15/02 (2013.01); B29D 2030/726 (2013.01); B60C 2013/045 (2013.01); C08L 2201/08 (2013.01); C08L 2205/03 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A tyre comprising:
a carcass structure comprising a carcass ply having opposite lateral edges associated to respective bead structures;
a tread band applied in a radially outer position with respect to the carcass structure;
a pair of sidewalls applied laterally on opposite sides of the carcass structure; and
at least one colored decorative element having a thickness equal to or greater than 200 μm applied on at least one side of the pair of sidewalls,
wherein the pair of sidewalls comprises an elastomeric composition comprising (i) at least one diene elastomeric polymer, and (ii) a non-staining ozone protection system,
wherein the at least one colored decorative element is made of a cross-linkable elastomeric composition comprising:
(i) 100 phr of elastomeric polymer comprising from 30 phr to 70 phr of natural and/or synthetic isoprene rubber, and from 30 phr to 70 phr of a rubber chosen from butyl rubber, halobutyl rubber, butadiene rubber, styrene-butadiene rubber, and mixtures thereof, and
(ii) from 5 phr to 120 phr of at least one reinforcement filler,
wherein the at least one colored decorative element is directly applied green or partially vulcanized to the at least one sidewall of the pair of sidewalls of the tyre when green, and co-vulcanized with the tyre,
wherein the non-staining ozone protection system consists of at least one phenolic antioxidant in an amount equal to or greater than 3 phr and at least one cyclic acetal or enol-ether antioxidant in an amount equal to or greater than 1 phr, and the non-staining ozone protection system is free of (i) antioxidants and/or antiozonants based on aromatic amines, (ii) waxes and (iii) other polymeric static protective agents,
wherein the at least one phenolic antioxidant is selected from the group consisting of: pentaerythrityl tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], 2,2-thio-diethylene bis-[(3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate)], octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, isooctyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene, 4,6-bis(dodecylthiomethyl)-o-cresol, 4,6-bis(octytiomethyl)-o-cresol, triethyleneglycol-bis[(3-(3-t-butyl-5-methyl-4-hydroxyphenyl)propionate)], 1,6-hexanediol-bis[(3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate], and 4-{[4,6-bis(octylsulphanyl)-1,3,5-triazin-2-yl]amino]-2,6-di-t-butylphenol, and
the at least one cyclic acetal or enol-ether antioxidant is selected from the group consisting of 3,9-di-3-cyclohexen-1-yl-2,4,6,10-tetraoxaspyro[5.5]undecane, and cyclohexen-3-ylidenmethyl-benzylether.