US 12,338,339 B2
Power transmission belt with conductive rubber mixture having graphene
Miles Theisen, Omaha, NE (US)
Assigned to ContiTech Deutschland GmbH, Hannover (DE)
Filed by ContiTech Deutschland GmbH, Hannover (DE)
Filed on Jun. 24, 2024, as Appl. No. 18/751,993.
Claims priority of provisional application 63/510,470, filed on Jun. 27, 2023.
Prior Publication US 2025/0002692 A1, Jan. 2, 2025
Int. Cl. C08K 13/00 (2006.01); C08K 3/04 (2006.01); C08K 3/26 (2006.01); C08K 11/00 (2006.01); F16G 1/10 (2006.01); F16G 1/28 (2006.01); F16G 5/08 (2006.01); F16G 5/20 (2006.01)
CPC C08K 13/00 (2013.01) [F16G 1/10 (2013.01); C08K 3/04 (2013.01); C08K 3/042 (2017.05); C08K 2003/265 (2013.01); C08K 11/00 (2013.01); C08K 2201/001 (2013.01); C08K 2201/005 (2013.01); C08K 2201/006 (2013.01); F16G 1/28 (2013.01); F16G 5/08 (2013.01); F16G 5/20 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A power transmission belt comprising an elastomeric body having an inner section, an outer section, and a load carrying section between the inner and outer sections, at least the inner section being formed from a conductive rubber mixture comprising:
at least one base rubber selected from one or more of ethylene-propylene-diene rubber, acrylonitrile-butadiene rubber, hydrogenated acrylonitrile-butadiene rubber, natural rubber, and/or styrene butadiene rubber;
25 phr to 100 phr of non-conductive carbon black as a filler, the non-conductive carbon black having a BET surface area of 130 m2/g or less according to ISO 977:2022;
up to 5 phr of graphene as a conductive filler, the graphene having a particle size of between 100 nm to 5 μm, and a specific surface area of less than 200 m2/g;
10 phr to 50 phr of graphite;
2 phr to 30 phr of fiber filler; and
a vulcanizing agent;
wherein the conductive rubber mixture has a resistivity according to ASTM D991-89(2020) of less than 2 MΩ, and
wherein the conductive rubber mixture has an elongation at break of less than 201%.