Multi-composite planar reinforcement

Patent metadata

Field	Value
Publication number	US-10259266-B2
Application number	US-201515307101-A
Country	US
Kind code	B2
Filing date	Apr 21, 2015
Priority date	Apr 29, 2014
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

A flat or planar reinforcer shaped as a multicomposite strip (R 1 ), which is defined by three main perpendicular directions: an axial direction (X), a transverse direction (Y), and a radial direction (Z), has a width L R in the Y direction of between 2 and 100 mm, and has a thickness E R in the Z direction of between 0.1 and 5 mm. A ratio L R /E R is greater than 3. The multicomposite strip includes a plurality of monofilaments made of a composite material. The monofilaments are oriented along the X direction and include filaments of a mineral material embedded in a thermoset resin having a glass transition temperature Tg 1 that is greater than 70° C. The monofilaments are coated in a layer of thermoplastic material. The reinforcer may be used to reinforce a tire and a multilayer laminate, which may be used to reinforce a tire.

First claim

The invention claimed is:

1. A multilayer laminate comprising at least one reinforcer positioned between and in contact with two layers having a rubber composition, each of the at least one reinforcer including a multicomposite strip, wherein
the multicomposite strip is defined according to three main perpendicular directions that include an axial direction (X), a transverse direction (Y), and a radial direction (Z),
the multicomposite strip has:
a width L R in the Y direction of between 2 and 100 mm,
a thickness E R in the Z direction of between 0.1 and 5 mm, and
a ratio L R /E R greater than 3, and
the multicomposite strip includes at least:
a plurality of monofilaments made of a composite material, the monofilaments being oriented along the X direction and including filaments of a mineral material embedded in a thermoset resin having a glass transition temperature (Tg 1 ) that is greater than 70° C., and
a layer of thermoplastic material coating the monofilaments.

2. The reinforcer according to claim 1 , wherein the Tg 1 is greater than 100° C.

3. The reinforcer according to claim 2 , wherein the Tg 1 is greater than 160° C.

4. The reinforcer according to claim 1 , wherein the thermoplastic material has a glass transition temperature Tg 2 that is greater than −30° C.

5. The reinforcer according to claim 4 , wherein the Tg 2 is greater than 50° C.

6. The reinforcer according to claim 1 , wherein an elongation at break (Ar) of the multicomposite strip, measured at 20° C., is equal to or greater than 3.0%.

7. The reinforcer according to claim 1 , wherein a longitudinal tensile modulus (E RL20 ) of the multicomposite strip, measured at 20° C., is greater than 10 GPa.

8. The reinforcer according to claim 1 , wherein a transverse tensile modulus (E RT20 ) of the multicomposite strip, measured at 20° C., is greater than 300 MPa.

9. The reinforcer according to claim 8 , wherein the transverse tensile modulus (E RT20 ) of the multicomposite strip, measured at 20° C., is greater than 1000 MPa.

10. The reinforcer according to claim 1 , wherein an initial tensile modulus (E M20 ) of each of the monofilaments, measured at 20° C., is greater than 30 GPa.

11. The reinforcer according to claim 1 , wherein a real part of a complex modulus (E′ 150 ) of each of the monofilaments, measured by a DMTA method at 150° C., is greater than 25 GPa.

12. The reinforcer according to claim 1 , wherein a ratio E′ (Tg1-25) /E′ 20 is greater than 0.85, with E′ 20 being a real part of a complex modulus of each of the monofilaments measured by a DMTA method at 20° C., and with E′ (Tg1-25) being a real part of a complex modulus of each of the monofilaments measured by the DMTA method at a temperature equal to (Tg 1- 25) expressed in ° C.

13. The reinforcer according to claim 1 , wherein a compressive elastic deformation in bending of each of the monofilaments is greater than 3.0%.

14. The reinforcer according to claim 1 , wherein a compressive breaking stress in bending of each of the monofilaments is greater than 1000 MPa.

15. The reinforcer according to claim 1 , wherein a weight content of filaments in each of the monofilaments is between 60 and 80%.

16. The reinforcer according to claim 1 , wherein a thickness (D M ), measured along the radial direction (Z), of each of the monofilaments is between 0.05 and 3.0 mm.

17. The reinforcer according to claim 16 , wherein an average distance d separating one of the monofilaments from another of the monofilaments is such that a ratio d/D M is between 0.1 and 3.

18. The reinforcer according to claim 1 , wherein a number of the monofilaments is between 3 and 100.

19. The reinforcer according to claim 18 , wherein the number of the monofilaments is within a range of from 10 to 40.

20. The reinforcer according to claim 1 , wherein the mineral material is glass.

21. The reinforcer according to claim 1 , wherein the thermoset resin is a vinyl ester resin.

22. The reinforcer according to claim 1 , wherein an initial tensile modulus of the thermoset resin, measured at 20° C., is greater than 3.0 GPa.

23. The reinforcer according to claim 1 , wherein the thermoplastic material is a polymer or a polymer composition.

24. Reinforcer according to claim 23 , wherein the polymer is a polyester.

25. The reinforcer according to claim 1 , wherein an initial tensile modulus of the thermoplastic material, measured at 20° C., is between 300 and 3000 MPa.

26. The reinforcer according to claim 1 , wherein an elastic elongation of the thermoplastic material, measured at 20° C., is greater than 5%.

27. The reinforcer according to claim 1 , wherein an elongation at break of the thermoplastic material, measured at 20° C., is greater than 10%.

28. The reinforcer according to claim 1 , wherein, for periphery monofilaments of the monofilaments, which are located at a periphery of the reinforcer, a minimal thickness (E m ) of the layer of thermoplastic material covering each of the periphery monofilaments is between 0.05 and 0.5 mm.

29. The reinforcer according to claim 1 , wherein the width LR is between 5 and 50 mm.

30. The reinforcer according to claim 29 , wherein the width L R is between 10 and 40 mm, and
wherein the thickness E R between 0.15 and 3 mm.

31. The reinforcer according to claim 1 , wherein the ratio L R /E R is greater than 5.

Assignees

• Michelin & Cie
• Michelin Rech Tech

Inventors

• Delfino Antonio

Classifications

• B60C9/2003 Primary

  characterised by the materials of the belt cords · CPC title

• B60C2009/0085

  Tensile strength · CPC title

• D02G3/18

  from glass or the like · CPC title

• B60C9/0028 Primary

  Reinforcements comprising mineral fibres, e.g. glass or carbon fibres · CPC title

• B60C2009/2074

  Physical properties or dimension of the belt cord · CPC title