Propylene copolymer and process for the production thereof
US6303698A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2000 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | May 9, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/65916
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is propylene copolymers produced by the aid of a specific metallocene catalyst system, wherein a percentage of mis-insertion in the copolymer is highly controlled and the copolymers possess beat-resisting property and a high melt strength and a low MFR and are narrow in molecular weight distribution excellent in particulate properties as well as a process for producing the copolymers possessing high steroregularity at a practical polymerzation temperature. The gist of the present invention resides in production of propylene copolymers wherein copolymerization with .alpha.,.omega.-diene is carried out by the aid of a supported-type catalyst system comprised predominantly of the following compound (A), (B), (C) and (D) at a temperature above 45.degree. C.: PA1 the compound (A): a specific metallocene compound represented by EQU Q(C.sub.5 H.sub.4-m R.sup.1.sub.m)(C.sub.5 H.sub.4-n R.sup.2.sub.n) MXY, PA1 the compound (B): an aluminoxane, PA1 the compound (C): an organoaluminum compound, and PA1 the compound (D): a particulate carrier. An important feature of the propylene copolymers of the present invention resides in the fact that the copolymers are high stereoregular and h…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.