Method for improving low-temperature fluidity of lubricating oils using high-and-low-molecular weight polymer
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United States of America Patent
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Oct 1, 2002
Grant Date -
Dec 27, 2001
app pub date -
Jul 9, 2001
filing date -
Aug 22, 1997
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Abstract
A method for improving the low temperature fluidity of lubricating oil compositions based on addition to lubricating oils of a mixture of selected high molecular weight and low molecular weight alkyl (meth)acrylate copolymers is disclosed. Combinations of low molecular weight alkyl (meth)acrylate polymers containing zero to 25 weight percent (C.sub.16 -C.sub.24)alkyl (meth)acrylate with high molecular weight alkyl (meth)acrylate polymers containing 25 to 70 weight percent (C.sub.16 -C.sub.24)alkyl (meth)acrylate are especially effective at satisfying different aspects of low temperature fluidity properties simultaneously for a broad range of base oils.
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