US 9,644,168 B2 · Lubricating oil composition for refrigerating machines

Abstract

A lubricating oil composition for refrigerating machines contains a base oil and an additive in a form of a coumarin compound. When the present lubricating oil composition for refrigerating machines is used in refrigerating equipment such as an open-type automobile air-conditioner, an electric automobile air-conditioner, a gas heat pump, other air-conditioning equipment, a refrigerating machine, a vending machine, a showcase, a water-heating system and a refrigerating/heating system, it is possible to detect the leakage of a refrigerant with a long-lasting stability. Therefore, when an unsaturated chlorofluorocarbon refrigerant with a poor stability is used in the above-listed equipment, the present lubricating oil composition for refrigerating machines is significantly advantageous.

Claims16

Dependent claims

A refrigerant composition, comprising:

(a) a lubricating oil composition comprising
(a1) a base oil;
and
(a2) an additive comprising a coumarin compound;
and
(b) a refrigerant,
wherein:
the coumarin compound is selected from the group consisting of 10-oxo-2,3,5,6-tetrahydro-4H,10H-11-oxa-3a-aza-1H-benzo[de]anthracene-9-carboxylic acid ethyl, and 7-diethylamino-4-methylcoumarin;
and
a content of the coumarin compound ranges from 0.001 mass % to mass %, based on the total amount of the lubricating oil composition (a).

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/386,998Filed 21 Mar 2013

Priority

JP 2012-08220230 Mar 2012

Published

US 2015/0038381 A15 Feb 2015

Granted

9 May 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification44 codes

C10M 169/04
Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials,…:…
C09K 5/045
Comprising halogenated compounds: containing only fluorine as halogen
C10M 129/20
Ethers: cyclic ethers having 4 or more ring atoms, e.g. furans, dioxolanes
C10M 129/70
Esters: of monocarboxylic acids

Lubricating oil composition for refrigerating machines

Life of this patent

Lubricating oil composition for refrigerating machines

Life of this patent

Abstract

Claims16