Derivatized solid sheared polymer blends and process for their preparation
US6255387A · kind A · utility
3Cited by
2References
8Claims
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Key dates
| Filing date | Jan 8, 1998 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Jan 8, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M2227/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A derivatized blend and a process for producing that blend in which a high ethylene content ethylene-propylene polymer and a lower ethylene content ethylene-propylene polymer are subjected to simultaneous blending and shearing to reduce their molecular weights and molecular weight distribution and then reacted with an organic compound to derivatize the blend. The sheared derivatized blend of polymers can function as a shear stable multifunctional viscosity index improver with improved low temperature properties and, in some cases, dispersancy antioxidant and anti-wear properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.