Tyre for vehicle wheels

Patent metadata

Field	Value
Publication number	US-12377688-B2
Application number	US-201915734506-A
Country	US
Kind code	B2
Filing date	Jun 10, 2019
Priority date	Jun 11, 2018
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

The present disclosure relates to a tyre ( 100 ) for vehicle wheels comprising at least one carcass structure ( 101 ), a tread band ( 109 ) applied in a position radially external to said carcass structure, and a pair of sidewalls ( 108 ) applied laterally on the opposite sides with respect to said carcass structure, where on at least one sidewall of said pair of sidewalls ( 108 ), a label ( 120 ) is applied comprising a protective layer ( 121 ), an adhesive layer ( 123 ), and possibly one or more ink layers ( 122 ) interposed between said protective layer ( 121 ) and said adhesive layer ( 123 ), where said adhesive layer ( 123 ) adheres the label ( 120 ) to the surface of said sidewall, where said protective layer ( 121 ) comprises polyester-based and/or polyether-based cross-linked aliphatic polyurethanes exhibiting dynamic elastic modulus values E′, measured at 25° C., static tensile deformation 1%, dynamic deformation ±0.1%, and frequency 1 Hz, equal to or higher than about 5 MPa, and a residual deformation measured at 25° C. after 4 cycles of deformation from 0% to 12%, equal to or lower than about 1%.

First claim

The invention claimed is:

1. A tyre for vehicle wheels comprising at least one carcass structure, a tread band applied in a position radially external to the carcass structure, and a pair of sidewalls applied laterally on the opposite sides with respect to the carcass structure, wherein a label is applied on at least one sidewall of the pair of sidewalls,
the label comprising a single protective layer, an adhesive layer, and one or more ink layers interposed between the protective layer and the adhesive layer,
wherein the adhesive layer adheres the label to the surface of the sidewall, wherein the protective layer comprises a polyester-based cross-linked aliphatic polyurethane, a polyether-based cross-linked aliphatic polyurethane, or both exhibiting dynamic elastic modulus values E′, measured at 25° C., static tensile deformation 1%, dynamic deformation ±0.1%, and frequency 1 Hz, equal to or higher than about 5 MPa, and a residual deformation measured at 25° C. after 4 cycles of deformation from 0% to 12%, equal to or lower than about 1%, and
wherein a thickness of the protective layer is in a range from 50 μm to 200 μm.

2. The tyre according to claim 1 , wherein the polyester-based cross-linked aliphatic polyurethane, the polyether-based cross-linked aliphatic polyurethane, or both exhibit dynamic elastic modulus values equal to or lower than about 25 MPa.

3. The tyre according to claim 2 , wherein the polyester-based cross-linked aliphatic polyurethane, the polyether-based cross-linked aliphatic polyurethane, or both exhibit dynamic elastic modulus values equal to or lower than about 20 MPa.

4. The tyre according to claim 1 , wherein the polyester-based cross-linked aliphatic polyurethane, the polyether-based cross-linked aliphatic polyurethane, or both exhibit a residual deformation, measured at 25° C. after 4 cycles of deformation from 0% to 12%, equal to or lower than about 0.5%.

5. The tyre according to claim 1 , wherein the protective layer is made of a transparent or coloured polyurethane film.

6. The tyre according to claim 5 , wherein the coloured protective layer comprises an amount of pigment ranging from about 1% to 30% by weight, with respect to the overall weight of the protective layer.

7. The tyre according to claim 6 , wherein the coloured protective layer comprises an amount of pigment ranging from 3% to 20% by weight, with respect to the overall weight of the protective layer.

8. The tyre according to claim 1 , wherein the ink layer is printed on the protective layer by one or more of silk-screen, digital, flexographic, and pad printing.

9. The tyre according to claim 1 , wherein a thickness of the ink layer is in a range from 1 μm to 100 μm.

10. The tyre according to claim 1 , wherein the ink layer comprises polyurethane-based inks.

11. The tyre according to claim 1 , wherein the adhesive layer comprises pressure sensitive adhesives (PSA) or thermally activatable adhesives (TA).

12. The tyre according to claim 11 , wherein the adhesive layer comprises adhesives based on natural or synthetic rubber, acrylic adhesives, vinyl ether adhesives, silicone adhesives, urethane-based adhesives, and mixtures of two or more thereof.

13. The tyre according to claim 11 , wherein the adhesive layer comprises adhesives with an adhesion force, measured according to the ISO 11339 standard at a temperature of 23° C. between two PET films, equal to or greater than 2N.

14. The tyre according to claim 11 , wherein a thickness of the adhesive layer is in a range from 5 μm to 400 μm.

15. The tyre according to claim 1 , wherein the pair of sidewalls is made with a non-staining cross-linkable elastomeric composition, comprising (i) at least one diene elastomeric polymer, and (ii) an ozone protection system.

16. The tyre according to claim 15 , wherein the ozone protection system consists essentially of at least one phenolic antioxidant in an amount equal to or greater than 3 phr optionally in combination with at least one cyclic acetal or enol-ether antioxidant, in an amount equal to or greater than 1 phr.

17. The tyre according to claim 16 , wherein the 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.

18. The tyre according to claim 15 , wherein the 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-hydroxy-phenyl)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; 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(octylsulfanil)-1,3,5-triazin-2-yl]amino}-2,6-di-t-butylphenol.

19. The tyre according to claim 1 , wherein the thickness of the protective layer is in a range from 75 μm to 150 μm.

Assignees

• Pirelli

Inventors

• Balini Alfredo
• Carosio Guido Carlo
• Hanel Thomas
• Puppi Cristiano
• Rossiello Luigia
• Pozzoli Marco

Classifications

• B60C13/002

  Protection against exterior elements · CPC title

• G09F3/02

  Forms or constructions (layered products B32B) · CPC title

• C09J2475/006

  in the substrate · CPC title

• C08G18/42

  Polycondensates having carboxylic or carbonic ester groups in the main chain · CPC title

• G09F2003/0257

  Multilayer · CPC title