Rotational moulding process of ethylene polymers or copolymers having a controlled particle size and morphology
US6533988B2 · kind B2 · utility
4Cited by
7References
6Claims
0Family size
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Key dates
| Filing date | Dec 5, 2000 |
| Grant date | Mar 18, 2003 |
| Priority date | — |
| Expiry date | Dec 29, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/61922
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Rotational moulding process for polymerizing or copolmerizing ethylene for manufacturing ethylene polymers or copolymers having a controlled particle size and morphology. Ethylene is polymerized or copolymerized under ethylene polymerizing conditions in the presence of a supported metallocene catalyst, where the average particle size of the catalyst particles is selected within the range of 14-40 &mgr;m and the residence time at the polymerization is selected so as to achieve a polymer where average particle size is between 0.2-0.5 mm and the proportion of fractions between 0.1-0.6 is at least 80%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.