Method for in situ isomerization of polybutadiene
US10870315B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 2016 |
| Grant date | Dec 22, 2020 |
| Priority date | — |
| Expiry date | Nov 30, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L9/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Methods for in situ isomerization if polybutadiene may include adding mixture components of the cross-linkable rubber composition into a mixer, the mixture components comprising at least 10 phr of a polybutadiene rubber having at least 80 wt % cis-bonds and up to 90 phr of a second rubber component having at least some dienic unsaturation and mixing the mixture components during a nonproductive phase. Such methods may include processing the mixture components on a mill during a productive phase, adding at least 3 phr of a disulfide isomerization agent and mixing the disulfide isomerization agent with the mixture components. The mixing may take place in an internal mixer with the isomerization agent added to the mixer or alternatively, it may be added to the mill after the mixture components have been dropped from the mixer for cooling on the mill.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.