Polypropylenes having balanced strain hardening, melt strength, and shear thinning
US10538645B2 · kind B2 · utility
2Cited by
16References
17Claims
0Family size
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Key dates
| Filing date | Jan 21, 2016 |
| Grant date | Jan 21, 2020 |
| Priority date | — |
| Expiry date | Jun 22, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2666/28
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A composition comprising the reaction product of a 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 0.97, and a melt strength greater than 10 cN determined using an extensional rheometer at 190° C.; and within the range from 0.01 to 3 wt % of at least one organic peroxide, by weight of the polypropylene and organic peroxide. Such hyperbranched polypropylenes are useful in films, foamed articles, and thermoformed articles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.