公开(公告)号：US20230159847A1

公开(公告)日：2023-05-25

申请号：US17919765

申请日：2021-05-06

Applicant: Hitachi Astemo, Ltd.

Inventor： Satoshi ISHII ,  Hitomi TAKAHASHI

IPC: C10M149/14 ,  C08G18/08 ,  C08G18/20 ,  C08G18/76 ,  C08G18/48 ,  C08G18/32 ,  C08G18/66 ,  C10M169/04 ,  C10M107/50 ,  F16F9/53 ,  F16F9/18

CPC classification number: C10M149/14 ,  C08G18/0871 ,  C08G18/2063 ,  C08G18/7614 ,  C08G18/7671 ,  C08G18/4845 ,  C08G18/3206 ,  C08G18/6674 ,  C08G18/3215 ,  C08G18/3212 ,  C08G18/3228 ,  C08G18/6685 ,  C10M169/041 ,  C10M107/50 ,  F16F9/532 ,  F16F9/185 ,  C10M2229/0415 ,  C10M2217/045 ,  C10N2030/60

Abstract: Provided are an electroviscous fluid exhibiting a high ER effect and having sufficient durability, and a cylinder device. An electroviscous fluid of the present invention includes a fluid and polyurethane particles containing metal ions. The polyurethane particles have a phase separation structure of a hard segment and a soft segment, and contain an additive increasing a urethane bond forming the hard segment.

公开(公告)号：US20240400931A1

公开(公告)日：2024-12-05

申请号：US18691260

申请日：2022-09-14

Applicant: HITACHI ASTEMO, LTD.

Inventor： Satoshi ISHII ,  Seogchul SHIN ,  Yuichiro YAMAMOTO ,  Hitomi TAKAHASHI

IPC: C10M149/14 ,  C08G18/08 ,  C08G18/32 ,  C08G18/48 ,  C08G18/66 ,  C10N40/08 ,  F16F9/53

Abstract: Provided is an electro-rheological fluid, including: a fluid having an insulating property; and a polyether-based polyurethane particle containing a metal ion, wherein the polyurethane particle contains a chain extender, wherein the metal ion includes at least a Li ion, and wherein a ratio ([Li]/[O]) of a molar concentration ([Li]) of the Li ion to a molar concentration ([O]) of oxygen atoms of ether groups in the polyurethane particles satisfies the following condition: [Ratio of molar concentration ([Li]) of Li ion to molar concentration ([O]) of oxygen of ether groups] [Li]/[O]≥9.0×10−5.