POLY(METH)ACRYLATE-BASED VISCOSITY INDEX IMPROVER, AND LUBRICATING OIL ADDITIVE AND LUBRICATING OIL COMPOSITION CONTAINING VISCOSITY INDEX IMPROVER

PROBLEM TO BE SOLVED: To provide a viscosity index improver which can sufficiently decrease a high shear viscosity at 100°C while maintaining a high shear viscosity at 150°C, and to provide a lubrication oil additive and a lubricating oil composition containing the viscosity index improver.SOLUTION:...

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Bibliographic Details
Main Authors TAKAGI AKIRA, UENO RYUICHI, TAGAWA KAZUO, MATSUDA HIROMITSU
Format Patent
LanguageEnglish
Japanese
Published 22.01.2015
Subjects
CHEMISTRY
FUELS
LUBRICANTS
LUBRICATING COMPOSITIONS
METALLURGY
PEAT
PETROLEUM, GAS OR COKE INDUSTRIES
TECHNICAL GASES CONTAINING CARBON MONOXIDE
USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION
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Summary:PROBLEM TO BE SOLVED: To provide a viscosity index improver which can sufficiently decrease a high shear viscosity at 100°C while maintaining a high shear viscosity at 150°C, and to provide a lubrication oil additive and a lubricating oil composition containing the viscosity index improver.SOLUTION: There is provided a poly(meth)acrylate-based viscosity index improver having a polymer chain containing a structural unit represented by the following general formula (1), where the weight average molecular weight of the poly(meth)acrylate-based viscosity index improver is 100000 or more and the ratio (Mw/Mn) between the weight average molecular weight (Mw) and the number average molecular weight (mn) is 1.6 or less. 【課題】１５０℃での高せん断粘度を維持しつつ、１００℃での高せん断粘度を十分に低下させることが可能な粘度指数向上剤、並びに該粘度指数向上剤を含有する潤滑油添加剤及び潤滑油組成物を提供すること。【解決手段】下記一般式（１）で表される構造単位を含む重合鎖を有し、重量平均分子量Ｍｗが１００，０００以上であり、重量平均分子量Ｍｗと数平均分子量Ｍｎとの比Ｍｗ／Ｍｎが１．６以下である、ポリ（メタ）アクリレート系粘度指数向上剤。【選択図】なし
Bibliography:Application Number: JP20130142036