Nitrogen containing dispersant-viscosity improvers
US6265358A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1997 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Dec 3, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M159/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A composition comprising a hydrocarbon polymer having M.sub.n ranging from 20,000 to about 500,000, when the polymer is not a star polymer, and up to about GPC peak molecular weight of 4,000,000 when the polymer is a star polymer having attached thereto pendant groups A.sub.a and B.sub.b wherein each A is independently a member of the group of formula --Q--K.sub.k wherein each Q is independently an aliphatic or aromatic hydrocarbon group, each K is independently a member selected from the group consisting of amide groups, nitrile groups, ester groups and carboxylic acid groups, and each k is independently a number ranging from 1 to about 3, and when k.gtoreq.2, groups --K on adjacent carbon atoms, taken together, may constitute a succinimide group, and a is 0 or a number ranging from 1 to about 50; and each B is independently a member of the group of formula: ##STR1## wherein each X is independently O, S, or NR.sup.b, each R.sup.b is independently H, NH.sub.2, hydrocarbyl, hydroxyhydrocarbyl, or aminohydrocarbyl, each s is independently 1 or 2, and each Z is independently a hydrocarbyl group, optionally substituted with one or more carboxylic acid groups or amide groups, each R.sup…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.