Method of catalyst deactivation
US4634744A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1985 |
| Grant date | Jan 6, 1987 |
| Priority date | — |
| Expiry date | Jan 9, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/601
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An improved method of terminating ethylene polymerization and interpolymerization reactions by deactivating the Ziegler-type catalyst used in the reaction comprises the step of injecting a selected deactivating agent into the molten polymer solution in the polymerization reactor prior to degassing of the polymer solution. The deactivating agent is selected from the group consisting of: PA1 (a) natural hydrotalcite minerals and synthetic hydrotalcite-like materials; PA1 (b) Group IIIA metal salts of monocarboxylic acids; PA1 (c) alkali metal and alkaline earth metal salts of alkarylsulfonic acids; PA1 (d) alkali metal and alkaline earth metal salts of alkyl and alkaryl sulfuric acids; PA1 (e) organophosphites of a formula selected from the group consisting of (RO).sub.3 P and (RO).sub.2 POH where R is a hydrocarbon group containing 1 to 22 carbon atoms, inclusive; PA1 (f) ethoxylated hydrocarbylamines of the formula R'.sub.3-n N[(OCH.sub.2 CH.sub.2).sub.m OH].sub.n where R' is hydrogen or a hydrocarbon group containing 1 to 22 carbon atoms, inclusive, and at least one R' is a hydrocarbon group, n is 1 or 2, and m is an integer between 1 and 22, inclusive; PA1 (g) monocarboxylic acid…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.