Propylene polymers and products thereof
US6503993B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2000 |
| Grant date | Jan 7, 2003 |
| Priority date | — |
| Expiry date | Jun 27, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention concerns nucleated propylene polymers having a xylene soluble fraction at 23° C. of less than 2.5%, a crystallization temperature of over 124 ° C. and a tensile modulus of greater than 2,000 MPa. These polymers can be prepared by nucleating a propylene polymer with a polymeric nucleating agent containing vinyl compound units, and by polymerizing propylene optionally with comonomers in the presence of a Ziegler-Natta catalyst system primarily transesterified with a phthalic acid ester—a lower alcohol pair to provide said propylene polymer. The catalyst contains a strongly coordinating external donor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.