High melt strength polypropylene and extrusion process for preserving melt strength
US11414526B2 · kind B2 · utility
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11Claims
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Key dates
| Filing date | Jun 25, 2015 |
| Grant date | Aug 16, 2022 |
| Priority date | — |
| Expiry date | Feb 9, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of melt blending a polypropylene and the melt blended polypropylene therefrom, comprising providing a base-polypropylene having a MFR of less than 15 g/10 min and a molecular weight distribution (Mw/Mn) within the range from 5 to 16, and comprising hindered phenol and phosphorous-type antioxidants, and within the range from 5 ppm to 4000 ppm of an alkyl radical scavenger relative to the total weight of the components to form a melt blended polypropylene; melt blending the melt blended polypropylene at a temperature of at least 210° C.; and isolating a melt blended, melt blended polypropylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.