Method for removing hydrogenation catalyst residues from hydrogenated conjugated diene polymers
US4396761A · kind A · utility
17Cited by
1References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1981 |
| Grant date | Aug 2, 1983 |
| Priority date | — |
| Expiry date | Aug 21, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process is disclosed for removing hydrogenation catalyst residues from hydrogenated conjugated diene polymers by contacting a hydrocarbon solution of said polymers with an aqueous dilute solution of an alpha-hydroxysulfonic acid, separating the aqueous phase from the hydrocarbon phase, removing the hydrocarbon solvent from the hydrocarbon phase, producing a solid polymer, and applying heat and/or vacuum to the solid polymer to remove the residual alpha-hydroxysulfonic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.