Exxon Chemical Patents, Inc.

Tonen Corporation

Takeaki Fujii

Hiroshi Ueno

Sadakatsu Suzuki

Kenji Kobayashi

Toshiaki Kuribayashi

Takehisa Sato

Hironari Ueda

Tadashi Niwa

Satoshi Asano

A lubricant and combination lubricant and refrigerant composition for use in a refrigerating machine in which a substitute freon refrigerant, which lubricant contains a polymer of a fumaric ester or a fumaric ester and a copolymerizable alkylene, and optionally contains an organic carboxylic ester or a polyalkylene glycol with a kinematic viscosity of 2 to 30 cSt. The lubricant is compatible with substitute freon refrigerants such as hydrogen-containing halogenated hydrocarbons, particularly R 134a, in a wide temperature range, has a high viscosity index, is thermally and chemically stable, and has an excellent lubricity.

Lubricant and combination lubricant and refrigerant composition

A process to prepare a high molecular weight aliphatic polyester is disclosed, where a catalyst is portionwise added, and a radical scavenger is also added. The aliphatic polyester obtained has a number average molecular weight larger than 70,000.

Aliphatic polyester and a process for the preparation thereof

Growing community of inventors

Saitama, Japan

Takeaki Fujii