	US 12,264,259 B2
	Coating agent for oil seal
Natsumi Yasunaga, Fukushima (JP)
Assigned to NOK CORPORATION, Tokyo (JP)
Appl. No. 17/629,529
Filed by NOK CORPORATION, Tokyo (JP)
PCT Filed Jun. 30, 2020, PCT No. PCT/JP2020/025687 § 371(c)(1), (2) Date Jan. 24, 2022, PCT Pub. No. WO2021/014901, PCT Pub. Date Jan. 28, 2021.
Claims priority of application No. 2019-136650 (JP), filed on Jul. 25, 2019.
Prior Publication US 2022/0251419 A1, Aug. 11, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C09D 7/65 (2018.01); C09D 7/20 (2018.01); C09D 7/40 (2018.01); C09D 109/00 (2006.01); C09D 191/06 (2006.01); F16J 15/3284 (2016.01)

CPC C09D 191/06 (2013.01) [C09D 7/20 (2018.01); C09D 7/65 (2018.01); C09D 7/69 (2018.01); C09D 109/00 (2013.01); F16J 15/3284 (2013.01)]

5 Claims

1. A coating agent for oil seal comprising

polytetrafluoroethylene particles,

polymethylsilsesquioxane or silicon dioxide particles,

a paraffin wax, and

isocyanate group-containing 1,2-polybutadiene, and

being prepared as an organic solvent solution, characterized by comprising

60 to 80 parts by weight in total of polytetrafluoroethylene particles having a particle size of 0.5 μm or less and polymethylsilsesquioxane or silicon dioxide particles having a particle size of 3 to 7 μm, and

10 to 30 parts by weight of the paraffin wax, based on 100 parts by weight of the isocyanate group-containing 1,2-polybutadiene,

wherein the polytetrafluoroethylene particles are used at a ratio of 30 to 70 wt. % of the total amount of the polytetrafluoroethylene particles, polymethylsilsesquioxane, and silicon dioxide particles.