Polypropylene for films and the films therefrom
US11104783B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2016 |
| Grant date | Aug 31, 2021 |
| Priority date | — |
| Expiry date | Nov 27, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/025
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process to prepare a polypropylene, and the polypropylene and films therefrom, comprising combining a high melt strength polypropylene comprising at least 50 mol % propylene, and having a molecular weight distribution (Mw/Mn) greater than 6, a branching index (g′vis) of at least 0.95, and a melt strength of at least 20 cN determined using an extensional rheometer at 190° C., and within the range from 20 to 1000 ppm of a long half-life organic peroxide, and isolating the polypropylene, wherein the polypropylene thus formed has a molecular weight distribution (Mw/Mn) within a range of from 7 to 22, a z-average molecular weight of less than 1,600,000 g/mole, a branching index (g′vis) of at least 0.95; and a melt strength less than 20 cN.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.