Short rubber reinforcement fiber, rubber composition containing said short fiber, and power transmission belt

Patent metadata

Field	Value
Publication number	US-10215257-B2
Application number	US-201515302727-A
Country	US
Kind code	B2
Filing date	Apr 9, 2015
Priority date	Apr 17, 2014
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

Provided is a short rubber reinforcement fiber for short fiber-containing rubber compositions that are used for transmission belts for which friction transmission behavior has been stabilized and travel service life has been further improved. The present invention is a short fiber, which is the product of cutting an adhesive-treated synthetic long fiber multifilament yarn and is used by dispersing in a rubber composition, the short fiber being characterized in that the percentage of the number of non-adhesive-treated single yarns is 0-5%; and a method for manufacturing said short fibers, the method comprising a step for immersing a sudare-woven product in which the synthetic long fiber multifilament yarns have been sudare-woven in an adhesive treatment solution and then pressing at a nip pressure of 1.2-5.0 MPa using nip rolls, and a step for cutting the sudare-woven product bundles obtained to a specified length.

First claim

The invention claimed is:

1. Staple fibers, which are the product of cutting an adhesive-treated synthetic multifilament yarn, and are used by dispersing in a rubber composition; wherein, the ratio of the number of non-adhesive-treated single filaments is 0% to 50%, and oblateness of a cross-section of the synthetic multifilament yarn is 2.0 to 4.0.

2. The staple fibers according to claim 1 , wherein the adhesive is adhered to the staple fibers at 1.0% by weight to 5.0% by weight.

3. The staple fibers according to claim 1 , wherein the single filament fineness is 1 dtex to 8 dtex.

4. The staple fibers according to claim 1 , wherein the length of the staple fibers is 0.5 mm to 8 mm.

5. The staple fibers according to claim 4 , wherein the length of the staple fibers is 0.5 mm to 5 mm.

6. The staple fibers according to claim 1 , wherein the fineness of a cross-section of the synthetic multifilament yarn is 400 dtex to 8,000 dtex.

7. The staple fibers according to claim 1 , wherein the birefringence of the synthetic multifilament yarn is 0.050 or more.

8. A method for manufacturing the staple fibers according to claim 1 , comprising the following steps:
a step for immersing a woven tire fabric, obtained by weaving a synthetic multifilament yarn in the manner of a tire fabric, in an adhesive treatment solution followed by pressing with nip rolls at a nip pressure of 1.2 MPa to 5.0 MPa, and
a step for cutting bundles of the resulting tire fabric to a prescribed length.

9. The method according to claim 8 , wherein twisting of the synthetic multifilament yarn of the tire fabric is 9 twists/10 cm or less.

10. The method according to claim 8 , wherein the cover factor of warp yarn of the tire fabric ((warp yarn total fineness (dtex))×warp yarn density (yarns/cm)) is 150 to 2000.

11. The method according to claim 10 , wherein the cover factor of warp yarn of the tire fabric ((warp yarn total fineness (dtex))×warp yarn density (yarns/cm)) is 500 to 2000.

12. The method according to claim 8 , wherein the weave structure of the tire fabric is n/1 wherein n is an integer of 1 to 3.

13. The method according to claim 8 , wherein weft yarn density of the tire fabric is 0.5 yarns/5 cm to 5 yarns/5 cm.

14. A rubber composition containing the staple fibers manufactured according to the method according to claim 8 .

15. A power transmission belt composed of the rubber composition according to claim 14 .

16. A rubber composition containing the staple fibers according to claim 1 .

17. A power transmission belt composed of the rubber composition according to claim 16 .

Assignees

• Asahi Chemical Ind

Inventors

• Takami Yuki
• Ise Fumiaki
• Kawahara Hiroo
• Enokizono Hirofumi
• Sawairi Tatsuya

Classifications

• B29D99/0078

  Producing filamentary materials · CPC title

• D01G1/04

  by cutting · CPC title

• F16G5/08

  with textile reinforcement · CPC title

• B29B15/125 Primary

  by dipping · CPC title

• D06M15/41

  Phenol-aldehyde or phenol-ketone resins · CPC title