Rubber composition and power transmission belt incorporating the rubber composition

• US 20050037882A1
• Filed: 05/26/2004
• Published: 02/17/2005
• Est. Priority Date: 05/30/2003
• Status: Active Grant

• Current Assignee: Mitsuboshi Belting Limited
• Original Assignee: Mitsuboshi Belting Limited
• Inventors: Hineno, Yorifumi, Takeda, Kazuhiro, Nishiyama, Takeshi, Takechi, Hiroki, Takada, Toshimichi
• Granted Patent: US 7,485,060 B2
• Time in Patent Office: Days
• US Class Current: 474/263
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/30 Sulfur-, selenium- or tellurium-containing compounds
• CPC Class Codes: C08K 7/02 Fibres or whiskers
• CPC Class Codes: C08L 21/00 Compositions of unspecified rubbers
• CPC Class Codes: C08L 2205/16 Fibres; Fibrils
• CPC Class Codes: C08L 23/16 Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
• CPC Class Codes: C08L 2666/20 Macromolecular compounds having nitrogen in the main chain according to C08L75/00 - C08L79/00; Derivatives thereof
• CPC Class Codes: C08L 27/18 Homopolymers or copolymers or tetrafluoroethene
• CPC Class Codes: C08L 77/00 Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 97/02 Lignocellulosic material, e.g. wood, straw or bagasse manufacture of articles made from lignocellulosic material by dry processes B27N
• CPC Class Codes: F16G 5/06 with reinforcement bonded by the rubber
• CPC Class Codes: F16G 5/20 with a contact surface of special shape, e.g. toothed
• CPC Class Codes: Y10T 428/249933 Fiber embedded in or on the surface of a natural or synthetic rubber matrix
• CPC Class Codes: Y10T 428/2933 Coated or with bond, impregnation or core
• CPC Class Codes: Y10T 428/2969 Polyamide, polyimide or polyester

Abstract

A rubber composition with 10-50 parts by mass of polyamide short fiber per 100 parts by mass of a rubber and 10-100 parts by mass of a solid lubricant per 100 parts by mass of the rubber.

Claims

1. A rubber composition comprising:

10-50 parts by mass of polyamide short fiber per 100 parts by mass of a rubber; and

10-100 parts by mass of a solid lubricant per 100 parts by mass of the rubber.

2. The rubber composition according to claim 1 wherein the rubber comprises ethylene-α

-olefin elastomer.

3. The rubber composition according to claim 1 wherein the solid lubricant comprises at least one of (a) graphite, (b) molybdenum disulfide, and (c) polytetrafluoroethylene.

4. The rubber composition according to claim 2 wherein the solid lubricant comprises at least one of (a) graphite, (b) molybdenum disulfide, and (c) polytetrafluoroethylene.

5. The rubber composition according to claim 1 wherein the rubber comprises at least one of (a) natural rubber, (b) butyl rubber, (c) styrene-butadiene rubber, (d) chloroprene rubber, (e) ethylene propylene rubber, (f) alkylated chlorosulfonated polyethylene, (g) hydride-nitrile rubber, and (h) a mixed polymer of hydride-nitrile rubber and a metal salt of an unsaturated carboxylic acid.

6. The rubber composition according to claim 2 wherein the ethylene-α

-olefin elastomer comprises at least one of (a) ethylene propylene rubber and (b) ethylene propylene diene monomer.

7. The rubber composition according to claim 1 wherein the polyamide short fibers comprise at least one of (a) nylon 6, (b) nylon 66, and (c) nylon 610.

8. The rubber composition according to claim 1 wherein the polyamide short fibers have a length of 1-8 mm.

9. The rubber composition according to claim 1 wherein the polyamide short fibers have a denier of 5-10.

10. The rubber composition according to claim 1 wherein the solid lubricant comprises at least one of (a) mica, (b) talc, (c) trioxide antimony, (d) molybdenum diselenide, and (e) tungsten disulfide.

11. The rubber composition according to claim 1 further comprising carbon black in an amount of 30-60 parts by mass per 100 parts by mass of the rubber.

12. The rubber composition according to claim 1 further comprising a process oil in an amount of 4-20 parts by mass per 100 parts by mass of the rubber.

13. A power transmission belt comprising:

a body having a length, a tension section and a compression section,

the compression section comprising a rubber composition, the rubber composition comprising;

(a) 10-50 parts by mass of polyamide short fiber per 100 parts by mass of a rubber; and

(b) 10-100 parts by mass of a solid lubricant per 100 parts by mass of the rubber.

14. The power transmission belt according to claim 13 wherein the body comprises at least one load carrying member extending lengthwise of the body.

15. The power transmission belt according to claim 14 wherein the body comprises a cushion rubber layer in which the at least one load carrying member is embedded.

16. The power transmission belt according to claim 14 wherein the rubber comprises ethylene-α

-olefin elastomer.

17. The power transmission belt according to claim 14 wherein the solid lubricant comprises at least one of (a) graphite, (b) molybdenum disulfide, and (c) polytetrafluoroethylene.

18. The power transmission belt according to claim 16 wherein the solid lubricant comprises at least one of (a) graphite, (b) molybdenum disulfide, and (c) polytetrafluoroethylene.

19. The power transmission belt according to claim 14 wherein the rubber comprises at least one of (a) natural rubber, (b) butyl rubber, (c) styrene-butadiene rubber, (d) chloroprene rubber, (e) ethylene propylene rubber, (f) alkylated chlorosulfonated polyethylene, (g) hydride-nitrile rubber, and (h) a mixed polymer of hydride-nitrile rubber and a metal salt of an unsaturated carboxylic acid.

20. The power transmission belt according to claim 16 wherein the ethylene-α

-olefin elastomer comprises at least one of (a) ethylene propylene rubber and (b) ethylene propylene diene monomer.

21. The power transmission belt according to claim 14 wherein the polyamide short fiber comprises at least one of (a) nylon 6, (b) nylon 66, and (c) nylon 610.

22. The power transmission belt according to claim 14 wherein the polyamide short fibers have a length of 1-8 mm.

23. The power transmission belt according to claim 14 wherein the polyamide short fibers have a denier of 5-10.

24. The power transmission belt according to claim 14 wherein the solid lubricant comprises at least one of (a) mica, (b) talc, (c) trioxide antimony, (d) molybdenum diselenide, and (e) tungsten disulfide.

25. The power transmission belt according to claim 14 wherein the rubber composition further comprises carbon black in an amount of 30-60 parts by mass per 100 parts by mass of the rubber.

26. The power transmission belt according to claim 14 wherein the rubber composition further comprises a process oil in an amount of 4-20 parts by mass per 100 parts by mass of the rubber.

27. The power transmission belt according to claim 13 wherein the power transmission belt comprises a V-ribbed belt.

28. The power transmission belt according to claim 13 wherein the power transmission belt comprises a V-belt.

29. The power transmission belt according to claim 15 wherein the cushion rubber layer comprises ethylene-α

-olefin elastomer.

30. The power transmission belt according to claim 15 wherein the cushion rubber layer comprises at least one of (a) natural rubber, (b) butyl rubber, (c) styrene-butadiene rubber, (d) chloroprene rubber, (e) ethylene propylene rubber, (f) alkylated chlorosulfonated polyethylene, (g) hydride-nitrile rubber, and (h) a mixed polymer of hydride-nitrile rubber and a metal salt of an unsaturated carboxylic acid.

31. The power transmission belt according to claim 15 wherein the cushion rubber layer has no short fibers embedded therein.

32. The power transmission belt according to claim 14 wherein the at least one load carrying member comprises at least one of (a) polyester fiber, (b) aramid fiber, and (c) glass fiber.

33. The power transmission belt according to claim 32 wherein the at least one load carrying member is adhesion treated.

34. The power transmission belt according to claim 32 wherein the at least one load carrying member is adhesion treated with a resorcinol formaldehyde latex solution.

35. The power transmission belt according to claim 13 wherein at least one layer of a reinforcing fabric is applied to the body.

36. The power transmission belt according to claim 35 wherein the reinforcing fabric comprises at least one of (a) cotton, (b) polyester fiber, (c) aramid fiber, and (d) nylon fiber.

37. The power transmission belt according to claim 35 wherein the reinforcing fabric is made by one of a (a) plain weave, (b) twill weave, and (c) satin weave process.