Poly(meth)acrylate-based viscosity index improver, lubricant additive and lubricant composition containing viscosity index improver
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United States of America Patent
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Oct 10, 2017
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Jul 24, 2013
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Jul 24, 2012
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Abstract
The present invention provides a poly(meth)acrylate-based viscosity index improver comprising a core portion and three or more arm portions, wherein each of the arm portions consists of a polymer chain comprising a structural unit represented by the following formula (1), and one end of the polymer chain is bonded to the core portion, and wherein a weight-average molecular weight Mw is 100000 or more, and a ratio of the weight-average molecular weight Mw to a number average molecular weight Mn, Mw/Mn, is 1.6 or less.
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