Highly unsaturated multi-modal polyisoolefin composition and process for preparation thereof
US9982075B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 2015 |
| Grant date | May 29, 2018 |
| Priority date | — |
| Expiry date | Apr 28, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/025
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polyisoolefin-based polymer composition having a multimodal molecular weight distribution and a level of unsaturation of greater than about 4 mol % is described, which can be prepared by co-polymerizing 70-96 vol % isoolefin monomer and 30-4 vol % β-pinene or multi-olefin monomer, based on volume of isoolefin monomer and β-pinene or multi-olefin monomer, in a solution comprising 0-30 vol % aliphatic hydrocarbon diluent, based on volume of the solution, and an alkylaluminum halide initiator system. The polyisoolefin-based polymer composition has a multimodal molecular weight distribution having a first molecular weight fraction having a peak molecular weight (Mp) of less than about 300 kg/mol, and a second molecular weight fraction having a peak molecular weight (Mp) of greater than about 1000 kg/mol or at least 3 times greater than the Mp of the first molecular weight fraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.