Preparation of multimodal, high density, ethylene homopolymer barrier resins and films
US7951883B1 · kind B1 · utility
4Cited by
4References
14Claims
0Family size
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Key dates
| Filing date | Dec 4, 2009 |
| Grant date | May 31, 2011 |
| Priority date | — |
| Expiry date | Dec 4, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/06
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Disclosed is a multimodal, high density, homopolyethylene barrier resin. The resin is preferably made by a multistage process. The process comprises a first stage in which ethylene is homopolymerized in the presence of a Ziegler-Natta catalyst, organoaluminum cocatalyst, alkoxysilane modifier, and hydrogen. The reaction mixture from the first stage is devolatilized to remove all or substantially all of the hydrogen. The polymerization continues in a second stage wherein ethylene is added to the devolatilized reaction mixture to produce the barrier resin. The barrier resin provides films with improved barrier properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.