Process for preparing Ziegler-Natta produced polyethylene blends
US9109105B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2012 |
| Grant date | Aug 18, 2015 |
| Priority date | — |
| Expiry date | Mar 2, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2314/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing a multimodal polyethylene product with at least two different polyethylene resins can include producing a first polyethylene resin in the presence of a Ziegler-Natta catalyst in a reactor. The Ziegler-Natta catalyst used for the production of the first polyethylene resin has an average particle size (D50) of at most 15 μm. The HLMI of the first polyethylene resin is between 0.01 and 5 g/10 min. The process can include separately producing a second polyethylene resin in the presence of a Ziegler-Natta catalyst in a reactor. The MI2 of the second polyethylene resin is between 1 and 150 g/10 min. The process can include physically blending together the first and second polyethylene resins to produce a multimodal polyethylene product. The physical blending can be performed in a device for continuously melting and blending the first and second polyethylene resins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.