公开(公告)号：US20190077926A1

公开(公告)日：2019-03-14

申请号：US16081369

申请日：2017-02-15

Applicant: NOK CORPORATION

Inventor： Kenichi KUNIEDA ,  Tomonori FURUKAWA

IPC: C08J3/24 ,  C08K3/04 ,  C08K7/04

Abstract: A fluororubber composition and a crosslinked fluororubber product include substantially no oxide of a divalent metal, hydroxide of a divalent metal, or carbonate of a divalent metal, and comprise graphite having an average particle diameter of 4 μm to 20 μm or a pitch-based carbon fiber having an average fiber length of 0.04 to 0.15 mm, as a filler in a peroxide-crosslinkable fluororubber. Preferably, the graphite is included in the range of 5 phr by weight to 50 phr by weight, or the pitch-based carbon fiber is included in the range of 5 phr by weight to 50 phr by weight, per 100 phr by weight of the fluororubber.

公开(公告)号：US20180127571A1

公开(公告)日：2018-05-10

申请号：US15566996

申请日：2016-04-20

Applicant: NOK CORPORATION

Inventor： Kenichi KUNIEDA ,  Atsushi KOBAYASHI

IPC: C08L15/02 ,  C08L27/12 ,  C08K3/34 ,  C08K5/053 ,  C08K9/06 ,  C09K3/10

CPC classification number: C08L15/02 ,  C08K3/34 ,  C08K5/053 ,  C08K5/13 ,  C08K9/06 ,  C08K2003/2206 ,  C08K2003/2224 ,  C08L27/12 ,  C08L2201/08 ,  C09K3/1009

Abstract: A fluororubber composition that can provide a vulcanizate having excellent blister resistance, comprising 10 to 100 parts by weight of wollastonite surface-treated with a silane coupling agent and having an aspect ratio of 2 or more, and 0.5 to 10 parts by weight of a polyol-based crosslinking agent, based on 100 parts by weight of fluororubber comprising 60 to 100 wt. % of a solid fluororubber polymer and 40 to 0 wt. % of a liquid fluororubber polymer. It is preferable that 30 to 70 wt. % of wollastonite surface-treated with a silane coupling agent is replaced by wollastonite not surface-treated with a silane coupling agent, in terms of both ensuring of blister resistance and cost.