US 11,885,392 B2
Toothed belt made of rubber, and rubber composition
Manabu Mitsutomi, Hyogo (JP)
Assigned to Mitsuboshi Belting Ltd., Kobe (JP)
Appl. No. 17/292,839
Filed by Mitsuboshi Belting Ltd., Kobe (JP)
PCT Filed Nov. 21, 2019, PCT No. PCT/JP2019/045631
§ 371(c)(1), (2) Date May 11, 2021,
PCT Pub. No. WO2020/110907, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 2018-221012 (JP), filed on Nov. 27, 2018; and application No. 2019-194368 (JP), filed on Oct. 25, 2019.
Prior Publication US 2021/0396297 A1, Dec. 23, 2021
Int. Cl. C08L 15/00 (2006.01); C08K 3/26 (2006.01); C08K 3/013 (2018.01); C09J 119/02 (2006.01); B29D 29/08 (2006.01); F16G 1/08 (2006.01); C08K 5/09 (2006.01); C09J 161/12 (2006.01); F16G 1/28 (2006.01); C08K 5/098 (2006.01)
CPC F16G 1/08 (2013.01) [B29D 29/08 (2013.01); C08K 3/013 (2018.01); C08K 3/26 (2013.01); C08K 5/09 (2013.01); C08K 5/098 (2013.01); C08L 15/005 (2013.01); C09J 161/12 (2013.01); F16G 1/28 (2013.01); C08K 2003/265 (2013.01)] 9 Claims
 
1. A rubber toothed belt comprising:
a belt main body comprising a plurality of tooth portions provided at predetermined intervals along a longitudinal direction of the belt and comprising a first rubber composition, a back portion integrated with the tooth portions and comprising a second rubber composition, and a core wire embedded in the back portion in the longitudinal direction; and
a tooth cloth covering surfaces of the tooth portions,
wherein the first rubber composition forming the tooth portions comprises a composite polymer comprising a hydrogenated nitrile rubber and an unsaturated carboxylic acid metal salt in a mass ratio of the former/the latter=100/80 to 100/180, and comprises, with respect to 100 parts by mass of the composite polymer, 3 parts by mass to 50 parts by mass of a zinc oxide, 3 parts by mass to 50 parts by mass of a non-reinforcing filler, 10 parts by mass or less of a reinforcing filler, 5 parts by mass or less of short fibers, and 1 part by mass to 5 parts by mass of an organic peroxide.