The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 02, 2003
Filed:
Feb. 08, 2002
Toshinori Tazaki, Chiba, JP;
Idemitsu Kosan Co., Ltd., Tokyo, JP;
Abstract
A refrigerating oil composition for a carbon dioxide refrigerant which comprises as a main component a mixture comprising (A) a polyvinyl ether having a kinematic viscosity of 3 to 50 mm /s at 100° C. in an amount exceeding 40% by weight and of 99.1% by weight or less and (B) a polyoxyalkylene glycol having a kinematic viscosity of 3 to 50 mm /s at 100° C. in an amount of 0.1% by weight or more and less than 40% by weight. The composition exhibits an excellent lubricating property and a great viscosity index even when a carbon dioxide refrigerant is used. The composition exhibits excellent stability and an excellent lubricating property under the atmosphere of carbon dioxide in the supercritical condition while the above advantageous properties are maintained and can be used for a long period of time.