Low noack volatility poly α-olefins
AssigneeExxonMobil Chemical Patents Inc.
InventorsMaria Caridad B. Goze, Norman Yang
Life of this patent
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Abstract
The present invention relates to poly α-olefins (PAO's) which exhibit superior Noack volatility at low pour points. Mixtures of 1-decene and 1-dodecene are polymerized using an alcohol promoted BF3 in conjunction with a combination of cocatalysts. The reaction mixture is distilled to remove the unreacted monomeric and dimeric species. The resulting product is then hydrogenated to saturate the oliogomers to provide a hydrogenated product which has a viscosity of 5 cSt. This product is distilled to provide PAO's of varying viscosity grades. The 4 cSt PAO is comprised mostly of trimers and tetramers while the 6 cSt product is comprised of trimers, tetramers, and pentamers.
Claims15
A lubricant comprised of an oligomerzed α-olefin which has been subjected to hydrogenation, wherein said oligomerize α-olefin is prepared from an olefin feed comprised of 50 to 80 weight percent of 1-decene and 50 to 20 weight percent 1-dodecene, wherein said oligomerized α-olefin exhibits a Noack volatility of about 4 to 12% weight loss, as determined by as determined by a modified ASTM D5800 method, and a pour point of about −40° C. to −65° C. as determined by a modified ASTM D5950 method;
- wherein said modified ASTM D5800 method is an ASTM D5800 method with the exception that thermometer calibration is performed annually;
- wherein said modified ASTM D5950 method is an ASTM D5950 method with the exception that the lubricant to be tested is not heated prior to performing said method;
- and
- wherein said lubricant is prepared by oligomerization in the presence e of BF3 and at least two different cocatalysts, wherein said cocatalysts are selected from the groups (i) and (ii):
- (i) alcohols and
- (ii) alkyl acetates,
- provided that at least one cocatalyst is from group (i) and at least on cocatalyst is from group (ii).
A lubricant composition comprising:
- (a) a conventional lubricant;
- and
- (b) at least one lubricant comprised of an oligomerized α-olefin in which has been subjected to hydrogenation, wherein said oligomerized α-olefin is prepared from an olefin feed comprised of 50 to 80 weight percent of 1-decene and 50 to 20 weight percent 1-dodecene, wherein said oligomerized α-olefin exhibits a Noack volatility of about 4 to 12% weight loss, as determined by as determined by a modified STM D5800 method, and a pour point of about −40° C. to −65° C. as determined by a modified ASTM D5950 method;
- wherein said modified ASTM D5800 method is an ASTM D5800 method with the exception that thermometer calibration is performed annually;
- wherein said modified ASTM D5950 method is an ASTM D5950 method with the exception that the lubricant to be tested is not heated prior to performing said method, and
- wherein said lubricant is prepared by oligomerization in the presence of BF3 and at least two different cocatalysts, wherein said cocatalysts are selected from the groups (i) and (ii):
- (i) alcohols and
- (ii) alkyl acetates,
- provided that at least one cocatalyst is from group (i) and at least one cocatalyst is from group (ii).
A lubricant comprised of an oligomerized α-olefin which has been subjected to hydrogenation, wherein said oligomerized α-olefin is prepared from an olefin feed comprised of 50 to 80 weight percent of 1-decene and 50 to 20 weight percent 1-dodecene, wherein said oligomerized α-olefin exbhibits a Noack volatility of about 4 to 12% weight loss, as determined by as determined y a modified ASTM D5800 method, and a pour point of about −40° C. to −65° C. as determined by a modified ASTM D5950 method;
- wherein said modified ASTM D5800 method is an ASTM D5800 method with the exception that thermometer calibration is performed annually;
- wherein said modified ASTM D5950 method is an ASTM D5950 method with the exception that the lubricant to be tested is not heated prior to performing said method, and
- wherein said lubricant is prepared by oligomerization in the presence e of BE3 and at least two different cocatalysts, wherein said cocatalysts are selected from the groups (i) and (ii):
- (i) alcohols and
- (ii) alkyl acetates,
- provided that at least one cocatalyst is from group (i) and at least on cocatalyst is from group (ii) and
- wherein the cocatalyst comprises n-butanol and n-butyl acetate.
Dependencies are inferred from the claim text.