Back to results
US 5,518,639 AGranted
Powder metallurgy lubricant composition and methods for using same
AssigneeHoeganaes Corporation
InventorsSydney Luk, Ann Lawrence
Life of this patent
Estimating the term…
Abstract
The present invention provides lubricant compositions for the powder metallurgical field. The lubricant compositions contain a solid phase lubricant such as graphite, molybdenum disulfide, and polytetrafluoroethylene in combination with a liquid phase lubricant that is a binder for the solid phase lubricant. The binder can be chosen from various classes of compounds including polyethylene glycols, polyethylene glycol esters, partial esters of C.sub.3-6 polyhydric alcohols, polyvinyl esters, and polyvinyl pyrrolidones. The binder is solubilized in an organic solvent.
Claims20
A powder metallurgy lubricant composition, comprising:
- (a) from about 5 to about 50 weight percent of a solid lubricant that comprises, as a major component, graphite, molybdenum disulfide, or polytetrafluoroethylene, or mixtures thereof;
- (b) from about 1 to about 30 weight percent of a binder for said lubricant, said lubricant binder comprising
- (1) polyethylene glycols having a weight average molecular weight of from about 3000 to about 35,000;
- (2) polyethylene glycol esters having a weight average molecular weight of from about 500 to about 10,000, wherein the ester functionality is formed from saturated or unsaturated C.sub.12-36 fatty acids;
- (3) partial esters of C.sub.3-6 polyhydric alcohols wherein the ester functionality is formed from saturated or unsaturated C.sub.12-36 fatty acids;
- (4) polyvinyl esters having a weight average molecular weight of at least about 200, wherein the ester functionality is formed from saturated or unsaturated C.sub.12-36 fatty acids;
- (5) polyvinyl pyrrolidones having a weight average molecular weight of at least about 200;
- or
- (6) mixtures thereof;
- and
- (c) from about 30 to about 90 weight percent an organic solvent for the lubricant binding agent.
- wherein the weight ratio of the lubricant to the binder is from about 1:1 to about 10:1.
9 more elements
A powder metallurgy lubricant composition, comprising:
- (a) from about 5 to about 50 weight percent of a lubricant that comprises, as major component, graphite, molybdenum disulfide, polytetrafluoroethylene, or mixtures thereof;
- (b) from about 1 to about 20 weight percent of a binder for said lubricant, said lubricant binder comprising
- (1) polyethylene glycols having a weight average molecular weight of from about 3000 to about 35,000;
- (2) polyethylene glycol esters having a weight average molecular weight of from about 500 to about 10,000, wherein the ester functionality is formed from saturated or unsaturated C.sub.14-24 fatty acids;
- (3) partial esters of C.sub.3-6 polyhydric alcohols wherein the ester functionality is formed from saturated or unsaturated C.sub.14-24 fatty acids;
- (4) polyvinyl esters having a weight average molecular weight of at least about 200, wherein the ester functionality is formed from saturated or unsaturated C.sub.14-24 fatty acids;
- (5) polyvinyl pyrrolidones having a weight average molecular weight of at least about 200;
- or
- (6) mixtures thereof;
- and
- (c) from about 50 to about 90 weight percent an organic solvent for the lubricant binding agent.
8 more elements
A lubricant composition adapted to be dispersed in an organic solvent, comprising:
- (a) a solid lubricant that comprises, as a major component, graphite, molybdenum disulfide, polytetrafluoroethylene, or mixtures thereof;
- and
- (b) a binder for said lubricant, said lubricant binder comprising
- (1) polyethylene glycols having a weight average molecular weight of from about 3000 to about 35,000;
- (2) polyethylene glycol esters having a weight average molecular weight of from about 500 to about 10,000, wherein the ester functionality is formed from saturated and unsaturated C.sub.12-36 fatty acids;
- (3) partial esters of C.sub.3-6 polyhydric alcohols wherein the ester functionality is formed from saturated and unsaturated C.sub.12-36 fatty acids;
- (4) polyvinyl esters having a weight average molecular weight of at least about 200, wherein the ester functionality is formed from saturated and unsaturated C.sub.12-36 fatty acids;
- (5) polyvinyl pyrrolidones having a weight average molecular weight of at least about 200;
- or
- (6) mixtures thereof;
- wherein the weight ratio of the lubricant to the binder is from about 1:1 to about 10:1.
8 more elements
Dependencies are inferred from the claim text.