Refrigerating machine oil

Patent metadata

Field	Value
Publication number	US-2023159851-A1
Application number	US-202117920131-A
Country	US
Kind code	A1
Filing date	Apr 27, 2021
Priority date	Apr 30, 2020
Publication date	May 25, 2023
Grant date	—

Abstract

An aspect of the present invention provides a refrigerating machine oil containing: a lubricating base oil; a phosphorus-containing additive; and a polymer comprising an unsaturated carboxylic acid ester as a monomer unit.

First claim

1 . A refrigerating machine oil comprising:
a lubricating base oil; a phosphorus-containing additive; and a polymer comprising an unsaturated carboxylic acid ester as a monomer unit.

2 . The refrigerating machine oil according to claim 1 , wherein the lubricating base oil comprises a first hydrocarbon base oil having a kinematic viscosity at 40° C. of less than 6 mm 2 /s.

3 . The refrigerating machine oil according to claim 2 , wherein the lubricating base oil is a mixed base oil of the first hydrocarbon base oil and a second hydrocarbon base oil having a kinematic viscosity at 40° C. of 6 mm 2 /s or more, and
a (A)/(B) ratio is more than 1 and 1.5 or less, wherein (A) is a kinematic viscosity at 40° C. of the mixed base oil, and (B) is the kinematic viscosity at 40° C. of the first hydrocarbon base oil.

4 . The refrigerating machine oil according to claim 1 , having a kinematic viscosity at 40° C. of 10 mm 2 /s or less.

5 . The refrigerating machine oil according to claim 1 , wherein the unsaturated carboxylic acid ester is an unsaturated carboxylic acid ester having at least one alkyl group selected from a straight-chain alkyl group having 1 to 18 carbon atoms and a branched alkyl group having 4 to 40 carbon atoms.

6 . The refrigerating machine oil according to claim 1 , wherein the unsaturated carboxylic acid ester is a (meth)acrylic acid ester.

7 . The refrigerating machine oil according to claim 6 , wherein the (meth)acrylic acid ester comprises at least one selected from a (meth)acrylic acid ester having a linear alkyl group having 1 to 18 carbon atoms.

8 . The refrigerating machine oil according to claim 6 , wherein the (meth)acrylic acid ester comprises at least one selected from a (meth)acrylic acid ester having a linear alkyl group having 1 to 18 carbon atoms and at least one selected from a (meth)acrylic acid ester having a 2-position branched alkyl group having 4 or more and less than 20 carbon atoms.

9 . The refrigerating machine oil according to claim 1 , wherein the unsaturated carboxylic acid ester is an unsaturated dicarboxylic acid ester.

10 . The refrigerating machine oil according to claim 9 , wherein the unsaturated dicarboxylic acid ester comprises at least one selected from an unsaturated dicarboxylic acid ester having a linear alkyl group having 4 to 10 carbon atoms.

11 . The refrigerating machine oil according to claim 1 , wherein the polymer is a copolymer.

12 . The refrigerating machine oil according to claim 11 , wherein the copolymer comprises the unsaturated carboxylic acid ester and an α-olefin as monomer units.

Assignees

• Eneos Corp

Inventors

• Nara Fumiyuki
• SHONO Yohei
• Ogata Hidetoshi

Classifications

• C10N2040/30

  Refrigerators lubricants {or compressors lubricants} · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10N2030/02

  Pour-point; Viscosity index · CPC title

• C10N2020/04

  Molecular weight; Molecular weight distribution · CPC title

• C10N2020/02

  Viscosity; Viscosity index · CPC title