# US 8,772,530 B2 · Pentaerythritol tetraester

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,772,530 B2
- Document ID: US8772530B2
- Status: Granted
- Kind: B2
- Application number: 13/813,695
- Filed: 2011-06-30
- Published: 2013-05-23
- Granted: 2014-07-08
- Earliest claimed: 2010-08-24
- Assignees: KH Neochem Co., Ltd.
- Applicants: Toshihiro Inayama; Satoshi Hiyoshi; Nobuhito Amemiya; Shigehisa Kishimoto
- Inventors: Toshihiro Inayama; Satoshi Hiyoshi; Nobuhito Amemiya; Shigehisa Kishimoto
- Web page: https://patentgrep.com/patent/US8772530B2

## CPC

- C07C 69/34: Esters of acyclic saturated polycarboxylic acids having an esterified carboxyl group bound to an acyclic carbon atom
- C07C 67/08: by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
- C07C 69/33: esterified with hydroxy compounds having more than three hydroxy groups (esters of sugars C07H)
- C10M 105/38: of polyhydroxy compounds
- C10M 171/008: {Lubricant compositions compatible with refrigerants}
- C10M 2207/2835: used as base material
- C10M 2215/223: Five-membered rings containing nitrogen and carbon only
- C10N 2020/071: {Branched chain compounds}
- C10N 2020/101: {Containing Hydrofluorocarbons}
- C10N 2030/02: Pour-point; Viscosity index
- C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
- C10N 2040/02: Bearings
- C10N 2040/25: Internal-combustion engines
- C10N 2040/30: Refrigerators lubricants {or compressors lubricants}
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

A pentaerythritol tetraester which is a mixed ester of pentaerythritol and carboxylic acids is provided, wherein the carboxylic acids consist of isobutyric acid and 3,5,5-trimethylhexanoic acid and the molar ratio of isobutyric acid to 3,5,5-trimethylhexanoic acid in the carboxylic acids is 36/64 to 80/20. The pentaerythritol tetraester may be used in a refrigerant oil or the like which exhibits excellent miscibility with a difluoromethane refrigerant among other properties.

## Claims

### Claim 1

A pentaerythritol tetraester that is a mixed ester of pentaerythritol and carboxylic acids, the carboxylic acids consisting of isobutyric acid and 3,5,5-trimethylhexanoic acid wherein a molar ratio of isobutyric acid to 3,5,5-trimethylhexanoic acid (isobutyric acid/3,5,5-trimethylhexanoic acid ratio) is 36/64 to 80/20.

### Claim 2 (depends on 1)

The pentaerythrutol tetraester according to claim 1, wherein the molar ratio of isobutyric acid to 3,5,5-trimethylhexanoic acid (isobutyric acid/3,5,5-trimethylhexanoic acid ratio) in the carboxylic acids is 36/64 to 67/33.