Polypropylene composition
US6326432A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2000 |
| Grant date | Dec 4, 2001 |
| Priority date | — |
| Expiry date | Mar 17, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F110/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a polypropylene composition excellent in balance of low temperature impact-strength, rigidity, heat resistance and transparency, which is featured by comprising 20-95% by weight of a polypropylene defined in the following [I] and 5-80% by weight of a propylene-.alpha.-olefin copolymer defined in the following [II]: PA1 [I] a polypropylene featured by having: PA2 (1) a ratio of isotactic pentad (mmmm) of 0.900-0.949, PA2 (2) the 2,1- and 1,3-propylene units in the polymer chain in the amount of 0-1 mole %, PA2 (3) a weight average molecular weight (Mw) of 40,000-1,000,000, PA2 (4) a ratio of a weight average molecular weight (Mw) to a number average molecular weight (Mn), i.e. (Mw)/(Mn) of 1.5-3.8, and PA2 (5) in case of elevating the temperature of o-dichlorobenzene continuously or stepwise up to given temperatures to measure the amount of eluted polypropylene at each temperature, the position of a main elution peak is 95-110.degree. C. and the amount of components existing in the range of .+-.10.degree. C. of the main elution peak is at least 90% of the total amounts of components eluted at a temperature higher than 0.degree. C. and PA1 [II] a propylene-.alpha.-olefin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.