Processes for preparing grafted copolymers
US6410652B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2000 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Apr 6, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M2221/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Methods for making graft copolymers include (a) providing (i) an ethylene/propylene 9EP) copolymer or other graftable polymer, (ii) an ethylenically unsaturated sulfur-, nitrogen- and/or oxygen-containing monomer, and (iii) an amount of an initiator sufficient to graft said monomer and EP copolymer or other graftable polymer, (b) introducing the EP copolymer or other graftable polymer into an extruder, (c) introducing the monomer into the extruder, (d) introducing the initiator into the extruder, wherein at least one of the reactants employed in step (a) is introduced in the presence of a polar solvent, and (e) reacting the EP copolymer or other graftable polymer, monomer and initiator by operating the extruder, thereby forming the graft copolymer. Methods of making dispersant viscosity index improver and methods for making a lubricating oil, as well as graft copolymers, viscosity index improvers and lubricating oils made by such methods are also contemplated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.