| abstract |
PROBLEM TO BE SOLVED: To provide a sludge dispersant for lubricating oil having a low CCS viscosity at low temperature, excellent sludge dispersion performance, and excellent shear stability and demulsibility. SOLUTION: The weight average molecular weight is 1,000 to 10,000, 60 to 99% by weight of the following monomer (a), 1 to 40% by weight of the following monomer (b), and 0 to 11% by weight. A sludge dispersant for lubricating oil comprising a polymer (A) comprising the following monomer (c) as a constituent monomer. (A) Alkyl (meth) acrylate having an alkyl group having 8 to 36 carbon atoms (b) One kind selected from a monomer containing a hydroxyl group, an amino group, an amide group or an ether group represented by the general formula (1) more monomers CH 2 = C (R 1) -COO (a-O) n -R 2 (1) [Wherein, R 1 is a hydrogen atom or a methyl group, A is an alkylene group having 2 to 4 carbon atoms, R 2 is an alkyl group having 8 to 36 carbon atoms, and n is an integer of 1 to 20. ] (C) Alkyl (meth) acrylate having an alkyl group having 1 to 4 carbon atoms [Selection] None |