Propylene/ethylene block copolymer, blushing-resistant transparent polypropylene resin for molding, elastomer for molding, and molded article obtained therefrom
US6812292B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 24, 2003 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Sep 24, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polypropylene/ethylene block copolymer, which has a poly(ethylene-co-propylene) segment content of 5 to 100 wt. %, excluding 100 wt. %, and a total ethylene content of 2 to 95 wt. %. (a) The block polymer comprises polypropylene segments and poly(ethylene-co-propylene) segments chemically bonded thereto, and (b) the polypropylene segments and the poly(ethylene-co-propylene) segments have been synthesized in the presence of an olefin polymerization catalyst comprising an organometallic compound and a solid catalyst component comprising either titanium and a halogen, or titanium, magnesium, and a halogen. The block copolymer has a weight-average molecular weight of 100,000 or higher, is suitable for producing general-purpose molded articles, and has an excellent balance among mechanical properties, impact resistance, thermal properties, transparency, moldability, and other properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.