Improved grc (glass-resin composite) monofilament

Patent metadata

Field	Value
Publication number	US-2016159152-A1
Application number	US-201414908851-A
Country	US
Kind code	A1
Filing date	Jul 8, 2014
Priority date	Aug 1, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

A monofilament made of glass-resin composite has improved properties in compression, in particular at high temperature, and comprises glass filaments embedded in a crosslinked resin. The glass transition temperature of the resin is equal to or greater than 190° C. The elongation at break of the monofilament, measured at 23° C., is equal to or greater than 4.0%. The initial tensile modulus of the monofilament, measured at 23° C., is greater than 35 GPa. The real part of the complex modulus of the monofilament, measured at 190° C. by the DMTA method, is greater than 30 GPa. Pneumatic or non-pneumatic tires are reinforced with such a composite monofilament.

First claim

1 .- 18 . (canceled)

19 . A monofilament made of glass-resin composite comprising glass filaments embedded in a crosslinked resin,
wherein the glass transition temperature Tg of the resin is equal to or greater than 190° C.; wherein an elongation at break Eb of the monofilament, measured at 23° C., is equal to or greater than 4.0%; wherein an initial tensile modulus E 23 of the monofilament, measured at 23° C., is greater than 35 GPa; and wherein a real part of the complex modulus E′ 190 of the monofilament, measured at 190° C. by the DMTA method, is greater than 30 GPa.

20 . The monofilament according to claim 19 , wherein the Tg of the resin is greater than 195° C.

21 . The monofilament according to claim 20 , wherein the Tg of the resin is greater than 200° C.

22 . The monofilament according to claim 19 , wherein the Eb is greater than 4.2%.

23 . The monofilament according to claim 19 , wherein the Eb is greater than 4.4%.

24 . The monofilament according to claim 19 , wherein an E′ (Tg-25) /E′ 23 ratio is greater than 0.85, E′ 23 and E′ (Tg-25) being the real part of the complex modulus of the monofilament measured by DMTA, respectively, at 23° C. and at a temperature expressed in ° C. equal to Tg′−25, and Tg′ being the glass transition temperature of the resin measured by DMTA.

25 . The monofilament according to claim 24 , wherein the E′ (Tg-25) /E′ 23 ratio is greater than 0.90, E′ 23 and E′ (Tg-25) being the real part of the complex modulus of the monofilament measured by DMTA, respectively, at 23° C. and at a temperature expressed in ° C. equal to Tg′−25, and Tg′ being the glass transition temperature of the resin measured by DMTA.

26 . The monofilament according to claim 19 , wherein an E′ (Tg-10) /E′ 23 ratio is greater than 0.80, E′ 23 and E′ (Tg-10) being the real part of the complex modulus of the monofilament measured by DMTA, respectively, at 23° C. and at a temperature expressed in ° C. equal to Tg′−10, and Tg′ being the glass transition temperature of the resin measured by DMTA.

27 . The monofilament according to claim 26 , wherein the E′ (Tg′-10) /E′ 23 ratio is greater than 0.85, E′ 23 and E′ (Tg′-10) being the real part of the complex modulus of the monofilament measured by DMTA, respectively, at 23° C. and at a temperature expressed in ° C. equal to Tg′−10, and Tg′ being the glass transition temperature of the resin measured by DMTA.

28 . The monofilament according to claim 19 , wherein the E 23 is greater than 40 GPa.

29 . The monofilament according to claim 28 , wherein the E 23 is greater than 42 GPa.

30 . The monofilament according to claim 19 , wherein the E′ 190 is greater than 33 GPa.

31 . The monofilament according to claim 30 , wherein the E′ 190 is greater than 36 GPa.

32 . The monofilament according to claim 19 , wherein an elastic deformation in compression under flexion is greater than 3.0%.

33 . The monofilament according to claim 32 , wherein the elastic deformation in compression under flexion is greater than 3.5%.

34 . The monofilament according to claim 33 , wherein the elastic deformation in compression under flexion is greater than 4.0%.

35 . The monofilament according to claim 19 , wherein a breaking stress in compression under flexion is greater than 1000 MPa.

36 . The monofilament according to claim 35 , wherein the breaking stress in compression under flexion is greater than 1200 MPa.

37 . The monofilament according to claim 36 , wherein the breaking stress in compression under flexion is greater than 1400 MPa.

38 . The monofilament according to claim 19 , wherein a weight content of the glass filaments is between 60 and 80%.

39 . The monofilament according to claim 38 , wherein the weight content of the glass filaments is between 65 and 75%.

40 . The monofilament according to claim 19 , wherein a density of the monofilament is between 1.8 and 2.1 g/cm 3 .

41 . The monofilament according to claim 19 , wherein the resin is a vinyl ester resin.

42 . The monofilament according to claim 19 , wherein an initial tensile modulus of the resin, measured at 23° C., is greater than 3.0 GPa.

43 . The monofilament according to claim 42 , wherein the initial tensile modulus of the resin, measured at 23° C., is greater than 3.5 GPa.

44 . The monofilament according to claim 19 , wherein a diameter D of the monofilament is between 0.2 and 1.5 mm.

45 . The monofilament according to claim 44 , wherein the diameter D is between 0.3 and 1.2 mm.

46 . The monofilament according to claim 45 , wherein the diameter D is between 0.4 and 1.1 mm.

47 . A finished article or semi-finished product made of rubber comprising a monofilament according to claim 19 .

48 . A pneumatic or non-pneumatic vehicle tire comprising a monofilament according to claim 19 .

49 . The pneumatic or non-pneumatic vehicle tire according to claim 48 , wherein the monofilament is present in the belt or in the carcass reinforcement of the tire.

50 . The pneumatic or non-pneumatic vehicle tire according to claim 48 , wherein the monofilament is present in the bead zone of the tire.

Assignees

• Michelin & Cie
• Michelin Rech Tech

Inventors

• Delfino Antonio
• Meraldi Jean-Paul

Classifications

• B60C7/24

  characterised by means for securing tyres on rim or wheel body · CPC title

• B60C2009/0078

  Modulus · CPC title

• D10B2505/02

  Reinforcing materials; Prepregs · CPC title

• B60C9/005 Primary

  Reinforcements made of different materials, e.g. hybrid or composite cords · CPC title

• B60C2015/042

  characterised by the material of the core, e.g. alloy · CPC title