Catalytic process for oxidative, shear accelerated polymer degradation
US5006608A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1988 |
| Grant date | Apr 9, 1991 |
| Priority date | — |
| Expiry date | Sep 8, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10M2205/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The molecular weight and the thickening efficiency of primarily oil soluble hydrocarbon polymers, such as hydrogenated random copolymers and block copolymers of styrene-isoprene or styrene-butadiene, polyisobutylene, poly-n-butene, low unsaturation butyl rubbers, low unsaturation EPDM rubbers, preferably ethylene-propylene copolymers, of the type which are to be used as viscosity index improver additives or as precursors for dispersants and multi-functional viscosity improver additives for lubricating oils, are reduced by heating and masticating the polymers in the presence of oxygen or air and in the presence of a transition metal catalyst, preferably in the further presence of a peroxide accelerator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.