HYDRAULIC OIL FOR HYDRAULIC DEVICE AND HYDRAULIC DEVICE THAT USES SAID HYDRAULIC OIL FOR HYDRAULIC DEVICE

WIPO Patent Application WO/2020/213504

A1

The purpose of the present invention is to provide a hydraulic oil for a hydraulic device, e.g., an automotive shock absorber, the hydraulic oil allowing the individual components to stably present for the long term and reducing fluctuation in the friction coefficient during long-term use. The hydraulic oil for a hydraulic device according to the present invention comprises: a base oil; at least one selected from the group consisting of phosphite ester compounds and phosphate ester compounds; a primary amine compound; and a compound having a glycidyl group or epoxy group, and is characterized in that the content of the at least one selected from the group consisting of phosphite ester compounds and phosphate ester compounds exceeds 0.1 mass% with reference to the total of the base oil and the at least one selected from the group consisting of phosphite ester compounds and phosphate ester compounds, the molar ratio of the primary amine compound to the at least one selected from the group consisting of phosphite ester compounds and phosphate ester compounds is 30% to 500%, and the molar ratio of the compound having a glycidyl group or epoxy group to the at least one selected from the group consisting of phosphite ester compounds and phosphate ester compounds, is 10% to 500%.

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SUGIMOTO ITTOU (JP)
ASHIZAWA RYOTA (JP)
ONODERA TASUKU (JP)
SAKAI YOSHIE (JP)
TACHIBANA HIROAKI (JP)

PCT/JP2020/015893

October 22, 2020

April 08, 2020

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HITACHI AUTOMOTIVE SYSTEMS LTD (JP)

C10M141/10; C10M129/18; C10M133/06; C10M137/02; C10M137/04; F16F9/18; F16F9/32; C10N30/06; C10N40/08

JP2013155349A	2013-08-15
JP2011162766A	2011-08-25
JP2013108033A	2013-06-06
JP2018002844A	2018-01-11

HIRAKI & ASSOCIATES (JP)

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