US2010093579A1PendingUtilityA1

Engine lubricants

48
Assignee: CRODA INT PLCPriority: Feb 28, 2007Filed: Feb 21, 2008Published: Apr 15, 2010
Est. expiryFeb 28, 2027(~0.6 yrs left)· nominal 20-yr term from priority
Inventors:Stephen BoydeSteven James Randles
C10M 2209/1095C10M 2215/223C10N 2020/02C10N 2020/069C10N 2030/02C10M 2223/045C10M 2209/084C10M 2207/026C10M 2215/064C10M 169/04C10N 2030/74C10N 2040/25C10M 2219/106C10N 2020/071C10M 2207/2825C10M 2203/1025C10M 2229/02C10M 171/02C10M 2207/2835C10M 2207/2815C10N 2030/08C10M 2205/0285C10M 105/38C10M 2207/289C10M 105/36
48
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Claims

Abstract

An engine lubricant, especially an SAE OW engine lubricant is described. The engine lubricant has at least 15 wt % of at least one diester and not more than 15 wt % of additives, wherein said at least one diester, or mixture of said diesters if more than one is present, has a kinematic viscosity at 100° C. of not more than 3.3, a viscosity index of at least 130, a pour point of not more than −30° C. and a Noack evaporation loss of not more than 15 wt %. a) reaction products of at least one C 5 to C 12 , preferably C 6 to C 10 , aliphatic dicarboxylic acid or an anhydride thereof with at least one primary or secondary C 7 to C 12 , preferably C 8 to C 10 , aliphatic alcohol, wherein, if said at least one acid is branched, then at least one of said at least one alcohol is linear and, if said at least one acid is linear, then at least one of said at least one alcohol is branched; and b) reaction products of at least one C 5 to C 12 , preferably C 6 to C 10 , aliphatic monocarboxylic acid with at least one polyalkylene glycol wherein the alkyl group is selected from a C 2 to C 4 alkyl group and mixtures thereof, and wherein, if said at least one poly(alkylene glycol) contains at least one repeat unit that is branched methyl group, then at least one of said at least one acid is linear and, if said at least one poly(alkylene glycol) contains only linear repeat units, then at least one of said at least one acid is branched.

Claims

exact text as granted — not AI-modified
1 . An engine lubricant comprising at least 15 wt % of at least one diester and not more than 20 wt % of additives, wherein said at least one diester, or mixture of said diesters if more than one is present, has a kinematic viscosity at 100° C. of not more than 3.3, a viscosity index of at least 130, a pour point of not more than −30° C. and a Noack evaporation loss of not more than 15 wt %. 
   
   
       2 . An SAE OW engine lubricant comprising at least 15 wt % of at least one diester and not more than 20 wt % of additives, wherein said at least one diester, or mixture of said diesters if more than one is present, has a kinematic viscosity at 100° C. of not more than 3.3, a viscosity index of at least 130, a pour point of not more than −30° C. and a Noack evaporation loss of not more than 15 wt %. 
   
   
       3 . An engine lubricant according to  claim 1  comprising up to 90 wt % of said at least one diester. 
   
   
       4 . An engine lubricant according to  claim 1  which consists essentially of said at least one diester and said additives. 
   
   
       5 . An engine lubricant according to  claim 1  which comprises at least 25 wt % and up to 40 wt % of said at least one diester. 
   
   
       6 . An engine lubricant according to  claim 1  which comprises lubricant components selected from API Groups III, IV and V and mixtures thereof. 
   
   
       7 . An engine lubricant according to  claim 6  which consists essentially of said at least one diester, said additives and at least one API Group V lubricant. 
   
   
       8 . An engine lubricant according to  claim 1  in which said at least one diester has a kinematic viscosity at 100° C. of not more than 3.0 cSt and/or a viscosity index of at least 140 and/or a pour point of not more than −35° C. and/or a Noack evaporation loss of not more than 14.0 wt %. 
   
   
       9 . An engine lubricant according to  claim 1  in which said at least one diester is selected from the group consisting of:
 a) reaction products of at least one C 5  to C 12 , preferably C 6  to C 10 , aliphatic dicarboxylic acid or an anhydride thereof with at least one primary or secondary, preferably primary, C 7  to C 12 , preferably C 8  to C 10 , aliphatic monohydric alcohol, wherein, if said at least one acid is branched, then at least one of said at least one alcohol is linear and, if said at least one acid is linear, then at least one of said at least one alcohol is branched; and   b) reaction products of at least one C 5  to C 12 , preferably C 6  to C 10 , aliphatic monocarboxylic acid with at least one polyalkylene glycol wherein the alkyl group is selected from a C 2  to C 4  alkyl group and mixtures thereof, and wherein, if said at least one poly(alkylene glycol) contains at least one repeat unit that is branched methyl group, then at least one of said at least one acid is linear and, if said at least one poly(alkylene glycol) contains only linear repeat units, then at least one of said at least one acid is branched.   
   
   
       10 . An engine lubricant according to  claim 9  wherein said diester, when derived from diacids or anhydrides thereof and monohydric alcohols, contains 17 to 36, more particularly 20 to 30 and especially 23 to 26 carbon atoms or when derived from monoacids and poly(alkylene glycols), contains 17 to 40, more particularly 20 to 30 carbon atoms. 
   
   
       11 . An engine lubricant according to  claim 9  wherein the reaction products of dicarboxylic acids and alcohols are reaction products of either branched acids with linear alcohols or linear acids with branched alcohols and wherein the reaction products of monocarboxylic acids with poly(alkylene glycols) are reaction products of either branched acids with poly(ethylene glycol) or linear acids with poly(propylene glycol) or poly(butylene glycol), preferably poly(propylene glycol), or copolymers thereof containing at least one ethylene glycol repeat unit. 
   
   
       12 . An engine lubricant according to  claim 11  wherein the poly(alkylene glycol) has an average relative molecular mass about in the range 150 to 300, more particularly about in the range 180 to 250. 
   
   
       13 . An engine lubricant according to  claim 9  wherein said branched acids are branched in the β-position and/or do not contain any gem branched groups. 
   
   
       14 . An engine lubricant according to  claim 9  wherein said dicarboxylic acids comprise adipic acid, 3-methyl adipic acid and sebacic acid. 
   
   
       15 . An engine lubricant according to  claim 9  wherein said primary alcohols comprise 1-octanol, 1-decanol and mixtures thereof, 2-ethylhexanol and isononyl alcohol. 
   
   
       16 . An engine lubricant according to  claim 9  wherein said poly(alkylene glycols) comprise poly(propylene glycols), preferably having an average relative molecular mass between 180 and 250. 
   
   
       17 . An engine lubricant according to  claim 1  wherein said diesters are selected from the group consisting of di-isononyl adipate, di-n-octyl 3-methyl-adipate, di-2-ethylhexyl sebacate and PPG 225 n-octyl, n-decyl diester and mixtures thereof. 
   
   
       18 . An engine lubricant according to  claim 1  which comprises not more than 15 wt %, more preferably not more than 10 wt % of said additives. 
   
   
       19 . Use of an engine lubricant according to  claim 1  in lubricating a four-stroke engine. 
   
   
       20 . A method of lubricating a four-stroke engine comprising lubricating said engine with an engine lubricant as defined in  claim 1 .

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