Highly hydrogenated nonfunctional or functional terminated conjugated diene polymers
US5280081A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 10, 1992 |
| Grant date | Jan 18, 1994 |
| Priority date | — |
| Expiry date | Jan 10, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08C19/44
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In a first embodiment of the present invention, poisoning or deactivation of conventional homogeneous catalysts to be used in hydrogenation of the backbone unsaturation in liquid monofunctional and difunctional-terminated conjugated diene polymers, is prevented by reacting a blocking agent compound with the functional end groups present in these polymers. More specifically, subsequent to formation of a selected starting material monofunctional or difunctional-terminated conjugated diene polymer, a suitable blocking agent is reacted with the functional end groups of the polymer enabling relatively inexpensive titanium, iron, cobalt, or nickel-based homogeneous catalysts to be used in hydrogenating the backbone unsaturation of the polymer to a high degree. Subsequent to hydrogenation, the polymer is subjected to conventional hydrolysis using a mineral acid or base to remove the blocking groups and return the hydrogenated conjugated diene polymer to its original functionality. In a second embodiment, conventional homogeneous catalysts based on cobalt, nickel, titanium, or iron are utilized to hydrogenate low molecular weight liquid copolymers and homopolymers to a high degree. More pa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.