US 5,254,280 A · Refrigeration compositions having polyoxyalkylene glycols with alkylene groups having at least 4 carbon atoms therein

Abstract

The present invention is directed to polyoxyalkylene glycols which are used to flush currently used lubricants such as mineral oil, alkyl benzenes, and esters from a refrigeration system for conversion to fluorocarbon or hydrofluorocarbon refrigerants. The polyoxyalkylene glycol is selected from the group consisting of polyoxyalkylene glycol which is at least difunctional with respect to hydroxyl groups, polyoxyalkylene glycol having an alkyl cap on one end thereof, and polyoxyalkylene glycol having at least two alkyl caps. The polyoxyalkylene glycol has a molecular weight of about 300 to about 4,000, has a viscosity of about 5 to 150 centistokes at 37.degree. C., and is made from alkylene oxide having at least 4 carbon atoms.

Claims21

Dependent claims

A composition for use in compression refrigeration and air-conditioning comprising:

(a) at least one refrigerant selected from the group consisting of hydrofluorocarbon, hydrochlorofluorocarbon, fluorocarbon, and chlorofluorocarbon;
and
(b) at least one polyoxyalkylene glycol selected from the group consisting of polyoxyalkylene glycol which is at least difunctional with respect in hydroxyl groups and other polyoxyalkylene glycols having at least one alkyl cap on one end thereof;
wherein said polyoxyalkylene glycol has a molecular weight of about 300 to about 4,000, has a viscosity of about 5 to about 150 centistokes at 37.degree. C., and is made from alkylene oxide having at least 4 carbon atoms;
and
(c) a lubricant selected from the group consisting of mineral oil, alkyl benzene, and ester.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

07/922,113Filed 28 Jul 1992 · continuation in part

Priority

27 Dec 1988

Granted

19 Oct 1993

Term ends

Not estimatedThe source records don’t support an estimate.

Classification97 codes

C10M 107/38
Lubricating compositions characterised by the base-material being a macromolecular compound: containing halogen
C09K 5/044
For compression-type refrigeration systems: comprising halogenated compounds
C09K 5/045
Comprising halogenated compounds: containing only fluorine as halogen
C10M 111/04
Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups…:…

Family

Serial290,120Parent of this continuation-in-part · filed 27 Dec 1988

Serial614,549Parent of this continuation-in-part · filed 16 Nov 1990

US 5,154,846 AParent of this continuation-in-part

US 4,975,212 AParent of this continuation-in-part

US 5,254,280 AThis patent

From the US filing history. Foreign family members aren’t listed.

Refrigeration compositions having polyoxyalkylene glycols with alkylene groups having at least 4 carbon atoms therein

Life of this patent

Refrigeration compositions having polyoxyalkylene glycols with alkylene groups having at least 4 carbon atoms therein

Life of this patent

Abstract

Claims21