Process for production of syndiotactic propylene polymer
US8017705B2 · kind B2 · utility
3Cited by
17References
13Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 16, 2007 |
| Grant date | Sep 13, 2011 |
| Priority date | — |
| Expiry date | Jan 20, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a method for producing a syndiotactic propylene polymer having a syndiotactic pentad fraction (rrrr fraction) of not less than 85%, a melting point (Tm) within the range of 145-170° C. and a limiting viscosity [η] within the range of 0.1-10 dl/g by a solution polymerization method using a group 4 crosslinked metallocene compound, which is not accompanied by precipitation of a polymer (excluding white turbidity). Also disclosed is a production method which enables to continuously perform such a production.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.