Propylene block copolymer and resin composition
US6469100B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1999 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Jun 4, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A block copolymer is provided comprising one or more blocks of a propylene polymer (PP) and one or more blocks of an ethylene-propylene copolymer (EPR) having the properties:(1) the interface thickness of the PP block with EPR block is from 20-1000 nm;(2) the weight average molecular weight of the PP block is 10,000-1,000,000;(3) the proportion of mesopentad chain in the PP block is not less than 95%;(4) the particle diameter of the disperse phase in EPR block is 0.2-3 microns;(5) the weight average molecular weight of the EPR block is 50,000-1000,000;(6) the propylene content in the EPR block is 20-80 mole %;(7) the composition fluctuation in molecular weight in EPR block is within +/−5% from the average composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.