|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||508/287 ; 508/373 ; 508/375 ; 508/376 ; 508/551 ; 252/078.5|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 17 인용 특허 : 0|
Hydraulic fluid compositions and additive concentrates are described that provide improved wet filtrability. The additive components comprise a mixture formed from at least (a) a zinc dihydrocarbyl dithiophosphate anti-wear agent, (b) a succinimide compound, and optionally (c) one or more alkali metal or alkaline earth metal-containing detergents.
[ I claim:] [1.] A hydraulic fluid comprising: a major amount of (i) a hydraulic base oil and (ii) a minor amount of an additive composition comprising(a) a hydraulic grade zinc dihydrocarbyl dithiophosphate anti-wear agent having a TBN of at least 10 mgKOH/g;(b) from 0.03 to less than 1% by weight of a compound of formula: [ STR 2 ] in which Z is a group R.sub.1 R.sub.2 CH-- in which R.sub.1 and R.sub.2 are each independently straight- or branched-chained hydrocarbon groups containing from 1 to 34 carbon atoms and the total number of carbon atoms in the...