Polypropylene composition
US6323286A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2000 |
| Grant date | Nov 27, 2001 |
| Priority date | — |
| Expiry date | Apr 14, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/035
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The composition of the present invention is not costly, excellent in an emboss transferring property, and is applicable for various skin materials and interior materials. The present invention provides a polypropylene composition which comprises a propylene block copolymer component containing a crystalline polypropylene segment and a propylene/.alpha.-olefin copolymer segment, and a synthetic olefin rubber component and/or a synthetic styrene rubber component, wherein the copolymer segment has an intrinsic viscosity [.eta.].sub.RC of 6.5 dl/g or less, and an intrinsic viscosity ratio [.eta.].sub.RC /[72 ].sub.PP of the copolymer to the crystalline polypropylene segment is 0.5 to 1.3; and a product of this intrinsic viscosity ratio [.eta.].sub.RC /[.eta.].sub.PP and a weight ratio thereof W.sub.PP /W.sub.RC, ([.eta.].sub.RC /[.eta.].sub.PP).times.(W.sub.PP /W.sub.RC), falls in the range of 0.2-4.5; and a ratio of a melt flow rate of the rubber component to a melt flow rate of the crystalline polypropylene segment, [MFR].sub.TR /[MFR].sub.PP, is 0.3-80.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.