Hydrogenated diolefin-lower alkyl acrylate or methacrylate viscosity index improving copolymers for lubricating oils
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United States of America Patent
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Aug 6, 1985
Grant Date -
N/A
app pub date -
Dec 30, 1982
filing date -
Dec 30, 1982
priority date (Note) -
Expired
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Abstract
This invention relates to hydrogenated diolefin-lower alkyl acrylate or methacrylate copolymers and the use of these copolymers to improve the viscosity index (VI) of lubricating oils. The preferred copolymer is a fully hydrogenated, high molecular weight copolymer of 1,3-butadiene and methyl methacrylate containing at least about 71 mole percent 1,3-butadiene. A pour point depressant, VI improving polymer additive for lubricating oils is provided by incorporating a higher alkyl methacrylate in the copolymer. Further, a dispersant VI improving copolymer for lubricating oils and a dispersant for hydrocarbon fuels prepared by graft polymerizing a polar, nitrogen-containing graft monomer onto the VI improver or pour point depressant VI improver is also provided.
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