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US 4,711,732 AGranted
Radiation-resistant grease
AssigneesJapan Atomic Energy Research Institute, Matsumura Oil Research Corporation
InventorsKazuo Arakawa, Naohiro Hayakawa, Kenzo Yoshida, Tetsuya Yagi, Hiroshi Nakanishi
Life of this patent
Estimating the term…
Abstract
A radiation-resistant grease employed in various machines at nuclear facilities, based on (A) an oil principally composed of a phenoxyphenoxydiphenyl and a mono- and/or dialkyldiphenyl ether and (B) a bentonite based thickening agent, if necessary, together with (C) a gelling aid of alcohol, ketone, or carbonate ester.
Claims2
Radiation-resistant grease composed of:
- (A) 70-97 wt % of a base oil composed of the following components:
- a. 25-75 wt % of a phenyl ether based synthetic oil comprised of 0-70 wt % of o-(m-phenoxyphenoxy)diphenyl and 100-30 wt % of m-(m-phenoxyphenoxy)diphenyl;
- and
- b. 75-25 wt % of a mono- and/or dialkyldiphenyl ether having 6-20 carbon atoms in a alkyl group;
- and
- (B) 3-30 wt % of a bentonite based thickening agent.
3 more elements
Radiation-resistant grease composed of:
- (A) 60-96.5 wt % of a base oil composed of the following components:
- a. 25-75 wt % of a phenyl ether based synthetic oil comprised of 0-70 wt % of o(m-phenoxyphenoxy)diphenyl and 100-30 wt % of m-(m-phenoxyphenoxy)diphenyl;
- and
- b. 75-25 wt % of a mono- and/or dialkyldiphenyl ether having 6-20 carbon atoms in the alkyl group;
- (B) 3-30 wt % of a bentonite based thickening agent;
- and
- (C) 0.5-10 wt % of at least one gelling aid selected from the group consisting of an aliphatic alcohol having 1-5 carbon atoms, an aliphatic ketone having 3-8 carbon atoms and an aliphatic carbonate ester having 2-5 carbon atoms in the aliphatic group.
4 more elements
Dependencies are inferred from the claim text.