IP Library › Granted Patent US 10,781,321
Granted Patent B2
US 10,781,321 · App. 15/550,262 · Granted Sep 22, 2020

Coating agent for oil seal

Inventors: Natsumi Kimura (Kanagawa, JP); Katsumi Abe (Kanagawa, JP)
Assignee: NOK CORPORATION
C09D7/65C09D7/40C09D7/61C09D7/68C09D7/69C09D109/00C09D153/00F16J15/3204F16J15/3284C08K3/36C08L27/00C08L27/18C08L69/00C08L83/04F16J15/32
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Quick Facts
Patent No.
US 10,781,321
App. No.
15/550,262
Granted
Sep 22, 2020
Kind
B2
Abstract

A coating agent for oil seal comprising 10 to 160 parts by weight of a filler having a particle size of 0.5 to 30 □m based on 100 parts by weight of isocyanate group-containing 1,2-polybutadiene and being prepared as an organic solvent solution, wherein a contact angle between a substrate surface coated with the coating agent and engine oil is less than 35°. The coating agent can improve wettability with oil and reduce dynamic friction coefficient in oil, while increasing the roughness of the coating surface. Thus, low torque characteristics can be achieved, while maintaining excellent seal performance inherent in oil seal.

Claims (2)

1. An organic solvent solution based coating agent for oil seal comprising 10 to 160 parts by weight of a filler having a particle size of 0.5 to 30 μm based on 100 parts by weight of isocyanate group-containing 1,2-polybutadiene, wherein the organic solvent solution based coating agent provides a contact angle between a substrate surface coated with the coating agent and engine oil of less than 35°, wherein the filler is silica, silicone resin or polycarbonate.

2. An oil seal coated with the coating agent according to claim 1 .

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 15, 2017
From: KIMURA, NATSUMI; ABE, KATSUMI
To: NOK CORPORATION
Reel/Frame 043296/0098 →
Priority Claims (1)
JP 2015-028287 · Feb 17, 2015 · national
Continuity (1)
Related Publication 20180030287A1 · Feb 1, 2018
Cited By (1)
US 12,264,259