Process to produce strain hardened polypropylene
US11390731B2 · kind B2 · utility
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15References
25Claims
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Key dates
| Filing date | May 23, 2018 |
| Grant date | Jul 19, 2022 |
| Priority date | — |
| Expiry date | Jun 23, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2203/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process comprising combining a polymerization catalyst with propylene at a polymerization temperature to produce polypropylene granules having an MFR1, wherein the temperature of the polypropylene granules is maintained at least at the polymerization temperature; mixing the polypropylene granules with an organic peroxide at a temperature of at least the polymerization temperature for a residence time of at least 40 seconds at a temperature below the melting point temperature of the polypropylene granules to form a polypropylene product having an MFR2, wherein MFR1 is greater than MFR2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.