VEHICLE PNEUMATIC TYRE COMPRISING A SEALANT LAYER, AND METHOD FOR DETECTING A VEHICLE PNEUMATIC TYRE COMPRISING A SEALANT LAYER AND FOR RECYCLING A VEHICLE PNEUMATIC TYRE COMPRISING A SEALANT

Abstract

Vehicle pneumatic tyre comprising a sealant layer, and method for detecting a vehicle pneumatic tyre comprising a sealant layer and for recycling a vehicle pneumatic tyre comprising a sealant

Claims

1-13. (canceled)

14. A pneumatic vehicle tire comprising: a tread, sidewalls and an inner layer opposite the tread; a sealant layer having a radially inward facing surface; and a luminescent agent applied to the radially inward facing surface of the sealant layer.

15. The pneumatic vehicle tire of claim 14, the luminescent agent is one of a fluorescent agent and a phosphorescent agent.

16. The pneumatic vehicle tire of claim 14, the luminescent agent absorbs light in the wavelength range from 200 to 700 nm and emits light in the wavelength range from 350 to 800 nm.

17. The pneumatic vehicle tire of claim 14, the luminescent agent has been applied by a dispersion, in particular suspension or emulsion, or a solution, wherein the dispersion or the solution contains from 1% to 80% by weight of luminescent agents.

18. The pneumatic vehicle tire of claim 17, the liquid of the solution or dispersion comprises water.

19. The pneumatic vehicle tire of claim 14, the luminescent agent is a constituent of a film.

20. The pneumatic vehicle tire of claim 14, the luminescent agent has been applied in the form of a solid and in powder form.

21. The pneumatic vehicle tire of claim 14, the luminescent agent arranged circumferentially in the form of one or more strip(s), the strip(s) being continuous or interrupted.

22. The pneumatic vehicle tire of claim 14, luminescent agent arranged in individual spatial regions.

23. The pneumatic vehicle tire of claim 14, the luminescent agent covers 0.01% to 100% of the radially inward-facing surface of the sealant layer.

24. The pneumatic vehicle tire of claim 14, the sealant layer is a self sealing layer to automatically seal punctures of up to 5 millimeters in diameter.

25. The pneumatic vehicle tire of claim 14, the sealant layer comprises at least one polyolefin.

26. The pneumatic vehicle tire of claim 25, the sealant layer additionally comprises at least one polybutene.

27. A method of recycling a tire, the method comprising: providing a tire to be recycled, the tire comprising a sealant layer attached to an inner layer and having a radially inward facing surface; determining presence of a luminescent agent on the radially inward facing surface of the sealant layer; removing the sealant layer based on the determined presence of the luminescent agent; and recycling the tire based after removing the sealant layer.

28. The method of claim 27, determining the presence of the luminescent agent comprises using a photodiode.

Description

[0155] According to the example in FIG. 1a luminescent agent 6 has been arranged radially inward on the sealant layer 5, i.e. on the radially inward-facing surface 5a of the sealant layer 5.

[0156] In FIG. 1 the luminescent agent 6 has been applied with a random distribution in individual spatial regions 8, as illustrated again in plan view in FIG. 1a. FIG. 1a shows a schematic sector of the plan view of the radially inward-facing surface 5a.

[0157] FIG. 2 likewise shows a schematic sector of the plan view of the radially inward-facing surface 5a. In FIG. 2, the luminescent agent 6 has been applied in the form of a plurality of parallel strips 7. There may be three (see FIG. 2) or four strips (not shown in the figures) for example.

[0158] In FIG. 3 the luminescent agent 6 covers almost the entire surface 5a.

[0159] The luminescent agent 6 has been applied in a solution or suspension for example. The liquid of the solution or suspension is, for example, water, wherein styrene-acrylate copolymer may further be present as a binder.

[0160] The luminescent agent 6 may be any of the abovementioned agents which is soluble or suspensible in water, for example Rhodamine 6G.

[0161] The sealant itself is black. For reinforcement it contains at least one carbon black, in particular N 326, and the abovementioned composition

[0162] After excitation, in particular by light in the wavelength range from 200 to 700 nm, the luminescence through emission of light in the wavelength range from 350 to 800 nm nanometers may either be identified by an operator or detected using a photodiode.

[0163] The pneumatic vehicle tire described by way of example can now be distinguished through luminescence as described from pneumatic vehicle tires without sealant by the process according to the invention.

[0164] This allows pneumatic vehicle tires with sealant according to the invention and pneumatic vehicle tires without sealant to be distinguished from one another in a, for example automated, process according to the invention, spatially separated and supplied to different recycling processes. In the case of the tire according to the invention sealant and luminescent agent are initially removed from the tire in an additional step.

LIST OF REFERENCE NUMERALS

[0165] (Part of the description) [0166] 1 Tread [0167] 2 Belt package [0168] 2a Belt layer [0169] 2b Belt layer [0170] 3 Carcass [0171] 3a Carcass turnup [0172] 4 Inner layer [0173] 5 Sealant layer [0174] 5a Surface of the sealant layer directed radially inward, running in axial direction, essentially parallel to the belt package [0175] 6 Luminescent agent [0176] 7 Strips [0177] 8 Spatial region [0178] 9 Sidewall [0179] 10 Bead core [0180] 11 Bead core profile [0181] rR Radial direction [0182] aR Axial direction [0183] UR Circumferential direction of the tire