Preactivated catalyst for olefin (CO)polymer, catalyst for olefin (CO)polymerization, olefin (CO)polymer composition, and process for producing the same
US6153710A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1998 |
| Grant date | Nov 28, 2000 |
| Priority date | — |
| Expiry date | Sep 22, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An olefin (co)polymer composition comprising, as major components, (a) 0.01 to 5 parts by weight of an olefin (co)polymer having an intrinsic viscosity [.eta..sub.a ] as measured in 135.degree. C. tetralin of 15 to 100 dl/g and (b) 100 parts by weight of an olefin (co)polymer obtained by using a metallocene catalyst and having an intrinsic viscosity [.eta..sub.b ] as measured in 135.degree. C. tetralin of 0.2 to 10 dl/g. When polyethylene having a high degree of polymerization is produced before a so-called metallocene catalyst is used to polymerize, e.g., propylene in the presence of the polyethylene as a component of a catalyst composition, a polypropylene composition having a high melt tension and a high crystallization temperature is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.