Process for production of propylene copolymers
US8026311B2 · kind B2 · utility
15Cited by
10References
5Claims
0Family size
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Key dates
| Filing date | Mar 25, 2005 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Aug 1, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F110/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The properties and the amounts of polymers produced in the second stage of a polymerization process in the presence of propylene and ethylene or other alpha olefin are controlled by the addition of an external electron donor to the second stage polymerization. The dosage of external donor to the second stage polymerization is based on a percentage of the dosage of external donor to a first stage polymerization of propylene in the process. The external donor added to the second stage is either the same as or different from the external donor added to the first stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.