Rubber compositions for radio devices in tires

• US 10,525,770 B2
• Filed: 12/09/2015
• Issued: 01/07/2020
• Est. Priority Date: 12/22/2014
• Status: Active Grant

• Current Assignee: Bridgestone Americas Tire Operations LLC (Bridgestone Corporation)
• Original Assignee: Bridgestone Americas Tire Operations LLC (Bridgestone Corporation)
• Inventors: Balnis, Craig R., Randall, Amy M., Wilson, Paul B.
• Primary Examiner(s): Hill, Nicholas E
• Application Number:
  US15/538,787
• Publication Number:
  US 20170368874A1
• Time in Patent Office: 1,490 Days
• CPC Class Codes: B29D 2030/0077 Directly attaching monitoring devices to tyres before or after vulcanization, e.g. microchips
• CPC Class Codes: B60C 1/00 Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08L 2205/22 Mixtures comprising a continuous polymer matrix in which are dispersed crosslinked particles of another polymer
• CPC Class Codes: C08L 7/00 Compositions of natural rubber
• CPC Class Codes: C08L 9/00 Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
• CPC Class Codes: G06K 19/02 characterised by the selection of materials, e.g. to avoid wear during transport through the machine
• CPC Class Codes: G06K 19/07764 the adhering arrangement making the record carrier attachable to a tire tire temperature or pressur control arrangements, see B60C23/00

Abstract

The embodiments described herein generally relate to an electronic communication module suitable for incorporating into a tire or tire retread, where the electronic communication module comprises a radio device having at least a portion of its outer surface surrounded by a rubber composition. Certain embodiments also relate to tires or tire retreads containing the electronic communication module. In addition, certain embodiments relate to methods for improving the readability of a radio device incorporated into a tire or tire retread.

Claims

1. An electronic communication module for a tire comprising:

a radio device having at least a portion of its outer surface surrounded by a rubber composition, the rubber composition comprising

100 phr of at least one diene-based elastomer, and

about 20 phr to about 130 phr of ground, cured rubber,

wherein the rubber composition has a dielectric constant at 915 MHz of less than 7 and contains less than 45 phr in total of reinforcing carbon black having a nitrogen surface area of greater than 20 m²/g and less than 5 phr of silica filler.

2. The electronic communication module according to claim 1, wherein the ground, cured rubber has an average particle size of about 105 to about 74 μ

m.

3. The electronic communication module according to claim 1, wherein the ground, cured rubber contains carbon black in an amount of about 10% to about 40% by weight based on the total weight of the ground, cured rubber.

4. The electronic communication module according to claim 1, wherein the ground, cured rubber has an average particle size of about 50 μ

m to about 250 μ

m.

5. The electronic communication module according to claim 1, wherein the rubber composition further comprises free carbon black.

6. The electronic communication module according to claim 5, wherein the total amount of reinforcing carbon black having a nitrogen surface area of greater than 20 m²/g is no more than 20 phr.

7. The electronic communication module according to claim 1, wherein the rubber composition has a thickness of 0.5 to 3 mm.

8. The electronic communication module according to claim 1, wherein the rubber composition further comprises at least 25 phr of at least one non-reinforcing filler.

9. The electronic communication module according to claim 1, wherein the at least one diene-based elastomer comprises at least one of styrene-butadiene rubber, polybutadiene, natural rubber, ethylene propylene diene monomer rubber, butyl rubber, neoprene, or polyisoprene.

10. The electronic communication module according to claim 1, wherein the rubber composition comprises no more than about 100 phr total carbon black including both reinforcing and non-reinforcing carbon black.

11. The electronic communication module according to claim 1, wherein the rubber composition has a dielectric constant at 915 MHz of 2.5 to less than 7.

12. The electronic communication module according to claim 10, wherein the carbon black is provided by about 30 phr to about 100 phr ground, cured rubber and about 10 phr to about 50 phr free carbon black.

13. The electronic communication module according to claim 1, wherein the radio device has a majority of its outer surface surrounded by the rubber composition.

14. The electronic communication module according to claim 1, wherein the radio device has at least 95% of its outer surface surrounded by the rubber composition.

15. The electronic communication module according to claim 1, wherein the radio device comprises a transponder.

16. A tire or tire retread comprising an electronic communication module comprising

a radio device having at least a portion of its outer surface surrounded by a rubber composition, the rubber composition comprisingphr of at least one diene-based elastomer selected from the group consisting of styrene-butadiene rubber, polybutadiene rubber, natural rubber, and combinations thereof, and

20-130 phr of ground, cured rubber,

wherein the rubber composition has a dielectric constant at 915 MHz of less than 7 and contains less than 45 phr in total of reinforcing carbon black having a nitrogen surface area of greater than 20 m²/g and less than 5 phr of silica filler.

17. A method of improving the readability of a radio device upon incorporation into a tire or tire retread, the method comprising surrounding at least a portion of the outer surface of the radio device by a rubber composition, thereby forming an electronic communication module, the rubber composition comprisingphr of at least one diene-based elastomer, and

about 20 phr to about 130 phr of ground, cured rubber, and

wherein the rubber composition has a dielectric constant at 915 MHz of less than 7 and contains less than 45 phr in total of reinforcing carbon black having a nitrogen surface area of greater than 20 m²/g, less than 5 phr of silica filler.

18. The method according to claim 17, wherein improving the readability comprises increasing the readability distance of the radio device.

19. The method according to claim 18, wherein the readability distance is increased without increasing power or energy required for the communication of the radio device.

20. The method according to claim 17, wherein the ground, cured rubber has an average particle size of about 50 μ

m to about 250 μ

m.

21. The method according to claim 17, wherein the at least one diene-based elastomer comprises at least one of styrene-butadiene rubber, polybutadiene, natural rubber, ethylene propylene diene monomer rubber, butyl rubber, neoprene, or polyisoprene.

22. The method according to claim 17, wherein the rubber composition has a dielectric constant at 915 MHz of 2.5 to less than 7.

23. The method according to claim 17, wherein the radio device has a majority of its outer surface surrounded by the rubber composition.