Multi-composite planar reinforcement
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.
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.