US 12,331,211 B2
Transmission belt core wire production method, transmission belt production method, processing agent and processing kit
Toshiki Ozaki, Hyogo (JP); and Yorifumi Hineno, Hyogo (JP)
Assigned to Mitsuboshi Belting Ltd., Kobe (JP)
Appl. No. 17/629,152
Filed by Mitsuboshi Belting Ltd., Kobe (JP)
PCT Filed Jul. 8, 2020, PCT No. PCT/JP2020/026758
§ 371(c)(1), (2) Date Jan. 21, 2022,
PCT Pub. No. WO2021/014980, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 2019-136378 (JP), filed on Jul. 24, 2019; and application No. 2020-110650 (JP), filed on Jun. 26, 2020.
Prior Publication US 2022/0267634 A1, Aug. 25, 2022
Int. Cl. C09D 123/16 (2006.01); D06M 15/227 (2006.01); D06M 15/693 (2006.01); D07B 5/00 (2006.01); F16G 1/10 (2006.01); F16G 5/08 (2006.01)
CPC C09D 123/16 (2013.01) [D06M 15/227 (2013.01); D06M 15/693 (2013.01); D07B 5/006 (2015.07); D07B 2501/2076 (2013.01); F16G 1/10 (2013.01); F16G 5/08 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method of producing a cord for a power transmission belt, the method comprising:
a first treatment step of treating an untreated yarn of a cord for a power transmission belt with a first treatment agent comprising a resin component (A) to obtain a first treated yarn, wherein the untreated yarn comprises raw material fibers comprising aramid fibers, and a rubber layer of the power transmission belt with which the cord is to come into contact comprises an ethylene-α-olefin elastomer; and
a second treatment step of treating the first treated yarn with a second treatment agent comprising a condensate (B1) of resorcin and formaldehyde, an unmodified styrene-butadiene-vinylpyridine latex (B2), and a maleic acid-modified polybutadiene (B3) to obtain a second treated yarn,
wherein the resin component (A) comprises an NBR modified epoxy resin (A1-1) modified with an elastic polymer, a total concentration (in terms of solid content) of the condensate (B1) and the unmodified styrene-butadiene-vinylpyridine latex (B2) is 8 mass % to 18.2 mass % in the second treatment agent, and a concentration (in terms of solid content) of the maleic acid-modified polybutadiene (B3) is 2.7 mass % to 13.2 mass % in the second treatment agent, or
wherein the resin component (A) comprises a condensate (A2-1) of resorcin and formaldehyde, a carboxyl-modified NBR latex (A2-2), and a curing agent (A2-3) comprising a polycarbodiimide resin having a plurality of carbodiimide groups, a total concentration (in terms of solid content) of the condensate (B1) and the unmodified styrene-butadiene-vinylpyridine latex (B2) is 5.2 mass % to 15 mass % in the second treatment agent, and a concentration (in terms of solid content) of the maleic acid-modified polybutadiene (B3) is 1.2 mass % to 9.7 mass % in the second treatment agent.