Viscosity index improvers, refrigeration oils, and working fluid compositions for refrigeration systems

A copolymer-based viscosity index improver with specific monomers addresses compatibility issues, enhancing solubility and viscosity index improvement in refrigeration oils, particularly at low temperatures.

JP7883494B2Active Publication Date: 2026-07-01SANYO CHEM IND LTD +1
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SANYO CHEM IND LTD
Filing Date
2022-06-14
Publication Date
2026-07-01

AI Technical Summary

Technical Problem

Existing viscosity index improvers for refrigeration oils have insufficient compatibility with refrigerants, particularly at low temperatures, and do not dissolve in refrigeration oils containing refrigerants and lubricating oils, limiting their effectiveness in improving viscosity index and low-temperature characteristics.

Method used

A viscosity index improver containing a copolymer with specific monomers having a solubility parameter of 8.1 to 10.0 (cal/cm³) and a mass ratio of monomer (b) to monomer (a) between 0.01 to 42, which enhances solubility in refrigerants and oxygen-containing base oils, improving viscosity index and low-temperature performance.

Benefits of technology

The viscosity index improver exhibits excellent solubility in refrigerants and oxygen-containing base oils, providing high viscosity index improvement and excellent low-temperature characteristics for refrigeration oils.

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Patent Text Reader

Abstract

The present invention relates to: a viscosity index improver which contains a copolymer (A) that contains, as essential constituent monomers, a monomer (a) represented by general formula (1) and having a fluorine atom and a monomer (b) represented by general formula (2), wherein the solubility parameter of the copolymer (A) is 8.1 to 10.0 (cal / cm3)1 / 2, and the ratio (b / a) of the mass of the monomer (b) to the mass of the monomer (a) in the monomers constituting the copolymer (A) is 0.01 to 42; and the like. [In general formula (1), R1 represents a hydrogen atom or a methyl group; R2 represents an alkylene group having 2 to 4 carbon atoms; p represents an integer of 0 or 1; q represents an integer of 0 to 20, and in cases where q is 2 or more, the R2 moieties may be the same as or different from each other; and Y represent a monovalent group that is obtained by substituting some or all of hydrogen atoms in a hydrocarbon group having 1 to 40 carbon atoms by fluorine atoms.] [In general formula (2), R3 represents a hydrogen atom or a methyl group; -X1- represents a group represented by -O- or -NH-; R4 represents an alkylene group having 2 to 4 carbon atoms; r represents an integer of 0 or 1; s represents an integer of 0 to 20, and in cases where s is 2 or more, the R4 moieties may be the same as or different from each other; and R5 represents a hydrocarbon group having 1 to 40 carbon atoms.]
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