Fluid hydrocarbon oil compositions containing block copolymers for improved viscosity temperature relationship
US4136048A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 8, 1975 |
| Grant date | Jan 23, 1979 |
| Priority date | — |
| Expiry date | Jan 8, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10N2040/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A fluid having an improved viscosity/temperature relationship results from a blend of that fluid and a block copolymer having an AB configuration wherein the A portion is a polymeric structure that is insoluble in said oil below a characteristic temperature and soluble above that temperature and the B portion is a polymeric structure that is soluble in said fluid over the complete range of temperature for which the liquid composition will be used and wherein the chain length of said B portion is small relative to that of said A portion. Fluid compositions having a relatively constant viscosity over an extended temperature range result when two or more such block polymers are blended with the fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.