Tyre for vehicle wheels

Patent metadata

Field	Value
Publication number	US-11518192-B2
Application number	US-201816489746-A
Country	US
Kind code	B2
Filing date	Mar 5, 2018
Priority date	Mar 6, 2017
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

The present invention relates to a tyre for vehicle wheels comprising at least one external structural element comprising at least one external structural element comprising a crosslinked elastomeric material obtained by crosslinking a crosslinkable elastomeric composition comprising (i) at least one diene elastomeric polymer, and (ii) a system for protection against ozone substantially free of polymeric static protective agents which essentially consists of at least one phenolic antioxidant in an amount substantially equal to or higher than 3 phr.

First claim

The invention claimed is:

1. A tyre for vehicle wheels comprising:
at least one external structural element comprising a crosslinked elastomeric material, wherein the crosslinked elastomeric material comprises, before vulcanization, a crosslinkable elastomeric composition and the crosslinkable elastomeric composition comprises:
at least one diene elastomeric polymer,
a system for protection against ozone substantially free of polymeric static protective agents, wherein the system consists essentially of at least one phenolic antioxidant and the at least one phenolic antioxidant is present in an amount equal to or higher than 3 phr and lower than 15 phr; and
wherein the system further consists essentially of at least one cyclic-acetal or enol-ether antioxidant, and the at least one cyclic-acetal or enol-ether antioxidant is present in an equal amount to or higher than 1 phr and lower than 10 phr.

2. The tyre according to claim 1 , further comprising:
at least one carcass structure with opposite side edges associated with respective annular reinforcing structures,
a tread band in a radially out position to the carcass structure, and
a pair of sidewalls laterally on opposite sides with respect to the carcass structure.

3. The tyre according to claim 1 , wherein the at least one external structural element is chosen from a sidewall and a pair of sidewalls.

4. The tyre according to claim 3 , further comprising one or more decorative elements on an external surface of the sidewall or the pair of sidewalls.

5. The tyre according to claim 1 , wherein the system is substantially free from antiozonants and/or antioxidants different from the phenolic, cyclic-acetal or enol-ether antioxidant.

6. The tyre according to claim 1 , wherein the at least one phenolic antioxidant is present in an amount lower than 12 phr.

7. The tyre according to claim 1 , wherein the at least one cyclic-acetal or enol-ether antioxidant is present in an amount lower than 8 phr.

8. The tyre according to claim 1 , wherein the at least one phenolic antioxidant is chosen from:
pentaerythritol 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;
isoocyl-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 (octylthiomethyl)-o-cresol;
triethylene glycol-bis[(3-(3-t-butyl-5-methyl-4-hydroxyphenyl) propionate)];
1,6-hexanediol-bis[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.

9. The tyre according to claim 1 , wherein the at least one phenolic antioxidant is chosen from 4,6-bis(octylthiomethyl)-o-cresol and 4{[4,6-bis(octylsulphanyl)-1,3,5-triazin-2-yl]amino}2,6-di-t-butylphenol.

10. The tyre for vehicle wheels according to claim 1 , wherein the at least one cyclic-acetal or enol-ether antioxidant is chosen from 3,9-di-3-cyclohexen-1-yl-2,4,6,10-tetraoxaspiro-[5.5]undecane and cyclohexen-3-ylidenemethyl-benzyl ether.

Assignees

• Pirelli

Inventors

• Dall'Abaco Davide
• Formaggio Virna
• Rossiello Luigia
• Hanel Thomas

Classifications

• B60C13/001

  Decorating, marking or the like · CPC title

• C08L2201/08

  Stabilised against heat, light or radiation or oxydation · CPC title

• B60C1/00 Primary

  Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · CPC title

• B60C1/0025 Primary

  Compositions of the sidewalls · CPC title

• C08K5/13

  Phenols; Phenolates · CPC title