Clarified polypropylene for long term color performance
US11535733B2 · kind B2 · utility
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Key dates
| Filing date | Feb 27, 2020 |
| Grant date | Dec 27, 2022 |
| Priority date | — |
| Expiry date | Feb 27, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2201/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Color-stable rheology controlled polyolefin compositions and methods of making are described. A color-stable rheology controlled polyolefin composition can include a controlled rheology grade thermoplastic polyolefin, and an effective amount of a trisamide-based compound that imparts color-stability to the composition. The color-stable solid-state thermoplastic polyolefin composition can have a Hunter b value color change (Δb) rate of ≤0.03/day when stored at 93° C. for 50 days.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.