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US 10,351,792 B2Granted
Poly (meth)acrylate with improved viscosity index for lubricant additive application
AssigneeAfton Chemical Corporation
InventorYungwan Kwak
Life of this patent
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Abstract
The present disclosure relates to polymers suitable for viscosity index improvers in lubricating oil compositions and further relates to oil compositions comprising such polymers. The disclosure also relates to polymer compositions derived from alkyl (meth)acrylate monomers and selected molar ratios of the (meth)acrylate monomers in the polymer suitable to use as viscosity modifiers.
Claims24
A polymer suitable for a viscosity modifier in lubricating oil compositions, the polymer comprising:
- about 88 to about 96 mole percent of alkyl (meth)acrylate monomer units including at least short chain alkyl (meth)acrylate monomer units with an alkyl chain length of 1 to 4 carbons and long chain alkyl (meth)acrylate monomer units with an alkyl chain length of 12 to 20 carbons, wherein an alkyl molar ratio of the long chain alkyl (meth)acrylate monomer units to the short chain alkyl (meth)acrylate monomer units is greater than 2.0 and less than 5.5;
- about 1 to about 6 mole percent of 2-hydroxyethyl (meth)acrylate monomer units;
- and
- a weight average molecular weight of about 100 kg/mol to about 500 kg/mol.
1 more element
A lubricant oil composition comprising:
- greater than 50% by weight of a base oil;
- about 1 to about 7.5 weight percent of a viscosity index improver including a (meth)acrylate polymer having as polymerized monomer units thereof about 88 to about 96 mole percent of alkyl (meth)acrylate monomer units including both short chain alkyl (meth)acrylate monomer units having an alkyl chain length of 1 to 4 carbons and long chain alkyl (meth)acrylate monomer units having an alkyl chain length of 12 to 20 carbons, and about 1 to about 6 mole percent of 2-hydroxyethyl (meth)acrylate monomer units;
- wherein an alkyl molar ratio of the long chain alkyl (meth)acrylate monomer units to the short chain alkyl (meth)acrylate monomer units is greater than 2.0 and less than 5.5;
- and
- wherein the (meth)acrylate polymer has a weight average molecular weight of about 100 kg/mol to about 500 kg/mol.
2 more elements
Dependencies are inferred from the claim text.