Viscosity index improver
AssigneeSanyo Chemical Industries, Ltd.
InventorsKouzou Sakai, Shigeyuki Yoshida, Makoto Dakurige
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Abstract
A viscosity index improver which contains a polymer dispersion comprising: a polyolefin having a weight average molecular weight of 10,000 to 500,000, a dispersant comprising a reaction product of an ethylenically unsaturated dicarboxylic acid added polyolefin with a carboxylic acid-reactive compound selected from the group consisting of an amine, a ketimine compound, an alcohol and an isocyanate compound and an organic liquid medium comprising a liquid phenolic derivative selected from the group consisiting of an alkyl phenol and an alkyl salicylate.
Claims19
A polymer dispersion comprising:
- (a) a polyolefin having a weight average molecular weight of 10,000 to 500,000;
- (b) a dispersant comprising a reaction product of an ethylenically unsaturated dicarboxylic acid-added polyolefin with a carboxylic acid-reactive compound selected from the group consisting of an amine, a ketimine compound, an alcohol and an isocyanate compound, said reaction product having an amide linkage, an imide linkage or an ester linkage, and
- (c) a phenolic derivative selected from the group consisting of an alkyl salicylate, phenol having one alkyl group of 1 to 20 carbon atoms and phenol having two alkyl groups of 1 to 20 carbon atoms.
Dependencies are inferred from the claim text.