Thermoplastic composition

Abstract

Lubricant grease compositions comprising a silicone base stock oil having a kinematic viscosity of from 20,000 to 100,000 mm 2 /s at 25° C., a metal salt of a fatty acid wherein the metal is selected from the group of lithium, calcium, aluminium, barium titanium, zinc, magnesium and/or sodium; and a suitable anti-wear additive.

1 . A lubricating grease composition comprising
 (a) 65 to 89.9% by weight of a silicone base stock oil having a kinematic viscosity of from 20,000 to 100,000 mm 2 /s at 25° C.;   (b) 10 to 35% by weight of a metal salt of a fatty acid wherein the metal is selected from the group of lithium, calcium, aluminium, barium titanium, zinc, magnesium and/or sodium; and   (c) 0.1 to 2% by weight of a suitable anti-wear additive.   
     
     
         2 . A lubricant composition according to  claim 1  where (a) is selected from a silicone lubricant base stock oil of Group V, as per the API classification of lubricant base oils or mixtures or greases thereof. 
     
     
         3 . A lubricant composition according to  claim 1  where (a) is selected from a silicone lubricant base stock oil trialkyl terminated polydiethylsiloxane, trialkyl silyl terminated polydimethylsiloxane, trialkyl silyl terminated polydimethylmethylalkylsiloxane, or trialkyl silyl terminated polymethylalkylsiloxane. 
     
     
         4 . A lubricant composition according to  claim 1  wherein component (b) comprises one or more of the lithium monocarboxylic fatty acids or lithium hydroxymonocarboxylic fatty acids, calcium monocarboxylic fatty acids or calcium hydroxymonocarboxylic fatty acids, aluminium monocarboxylic fatty acids or aluminium hydroxymonocarboxylic fatty acids barium monocarboxylic fatty acids or barium hydroxymonocarboxylic fatty acids and titanium monocarboxylic fatty acids or titanium hydroxymonocarboxylic fatty acids zinc monocarboxylic fatty acids or zinc hydroxymonocarboxylic fatty acids, magnesium monocarboxylic fatty acids or magnesium hydroxymonocarboxylic fatty acids and/or sodium monocarboxylic fatty acids. 
     
     
         5 . A lubricant composition according to  claim 1  wherein component (b) comprises one or more of, calcium, aluminium, barium and titanium, zinc, magnesium and/or sodium salts of fatty acids derived from animal oils or from vegetable oils. 
     
     
         6 . A lubricant composition according to  claim 1  wherein component (b) comprises the metal salts of one or more of lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, myristoleic acid, palmitoleic acid, oleic acid, or a linoleic acid. 
     
     
         7 . A lubricant composition according to  claim 1  wherein component (b) comprise lithium salts of 12-hydroxystearic acid, 14-hydroxystearic acid, 16-hydroxystearic acid, 6-hydroxystearic acid, or 9,10-hydroxystearic acid. 
     
     
         8 . A lubricant composition according to  claim 1  wherein component (c) comprise zinc dithiophosphate, organic polysulphides, phosphates, amine salt of sulphurized dibutyl hydrogen phosphate, dialkyldithiophosphates dithiocarbamates dihydrocarbyl phosphate; tricresyl phosphate sulphurized olefins, and sulphurized fatty acid esters. 
     
     
         9 . A lubricant composition according to  claim 1  wherein the composition may comprise up to 5% by weight of dry lubricant. 
     
     
         10 . A lubricant composition according to  claim 9  wherein the dry lubricant may include one or more of graphite, molybdenum disulphide, boron nitride, talc, polytetrafluoroethylene (PTFE), calcium fluoride, cerium fluoride, or tungsten disulfide. 
     
     
         11 . A lubricant composition according to  claim 1  wherein the composition additionally comprises one or more additives selected from friction modifiers, extreme pressure additives, seal swelling agents, rust and corrosion inhibitors, Viscosity Index improvers, pour point depressants, anti-oxidants, free-radical scavengers, hydroperoxide decomposers, metal passivators, surface active agents such as detergents, emulsifiers, demulsifiers, defoamants, compatibilizers, dispersants, deposit control additives, film forming additives, tackifiers, antimicrobials, additives for biodegradable lubricants, haze inhibitors, chromophores, and limited slip additives and mixtures thereof. 
     
     
         12 . A lubricant composition according to  claim 11  wherein each of the one or more additive(s) may be used at a level of from 0.01 to 10 wt % based on the total weight of the composition. 
     
     
         13 . A method of lubricating, comprising the steps of: applying a Use of a lubricant composition in accordance with  claim 1  to bearings in electric motors, wheel bearings, bearings in household appliances, machine tools or aircraft accessories, small gear drives, slow speed sliding applications, constant velocity joints, ball joints, alternators, cooling fans, ball screws, chucks, linear guides and machine tools, and dampen HiFi systems. 
     
     
         14 . (canceled) 
     
     
         15 . The method according to  claim 13 , wherein the lubricant composition is able to lubricate at temperatures below −30° C.