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US 5,851,967 AGranted
Dispersant viscosity index improving additive for lubricating oils
OwnerClaude C. Schauber, Nguyen Dinh Truong +1inventors
InventorsClaude C. Schauber, Nguyen Dinh Truong, David Sterett Moorman
Life of this patent
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Abstract
The present invention provides dispersant viscosity index improving additives for lubricating oils. The additives are copolymers comprising from 92 weight percent to 98 weight percent of a polymer backbone and from 2 weight percent to 8 weight percent branches grafted onto the polymer backbone.
Claims4
A graft copolymer, which comprises:
- from 92 weight percent to 98 weight percent of a polymer backbone, said polymer backbone comprising from 65 parts by weight to 95 p)arts by weight, per 100 parts by weight polymer backbone, of repeating units derived from one or more (C.sub.1 -C.sub.24)alkyl (meth)acrylate monomer;
- and from 5 parts by weight to 35 -parts by weight, per 100 parts by weight Polymer backbone, of repeating units derived from one or more styrenic monomer;
- and
- from 2 weight per cent to 8 weight percent of branches grafted onto the polymer backbone, said branches comprising one or more hydroxy(C.sub.2 -C.sub.8)alkyl (meth)acrylate monomer.
1 more element
A graft copolymer comprising:
- from 92 weight Percent to 98 weight percent of a polymer backbone;
- and
- from 2 weight per cent to 8 weight percent of branches grafted onto the polymer backbone, said branches comprising one or more hydroxy(C.sub.2 -C.sub.8)alkyl (meth)acrylate monomer:
- wherein the polymer backbone comprises:
- from 65 parts by weight to 95 parts by weight, per 100 parts by weight polymer backbone, of repeating units derived from one or more (C.sub.1 -C.sub.24)alkyl (meth)acrylate monomer;
- and
- from 5 parts by weight to 35 parts by weight, per 100 parts by weight polymer backbone, of repeating units derived from one or more styrenic monomer:
- wherein the (C.sub.1 -C.sub.24)alkyl (meth)acrylate monomer repeating units of the polymer backbone comprise:
- from 20 parts by weight to 90 parts by weight of one or more (C.sub.7 -C.sub.15)alkyl (meth)acrylate monomer repeating units per 100 parts by weight polymer backbone;
- and
- from 5 parts by weight to 45 parts by weight of one or more (C.sub.16 -C.sub.24)alkyl (meth)acrylate monomer repeating units per 100 parts by weight polymer backbone.
8 more elements
A lubricating oil composition, which comprises:
- 100 parts by weight of base oil selected from one or more paraffinic neutral oil and naphthenic neutral oil;
- and
- from 2 parts by weight to 20 parts by weight of one or more copolymer as claimed in any of claims 1, 3 or 4.
Dependencies are inferred from the claim text.