Propylene composition, process for preparing the same, polypropylene composition, and molded articles
US6300415A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1998 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Aug 14, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L23/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A polypropylene composition for the production of various molded articles which are excellent in moldability, mold shrinkage factor on molding, rigidity, flexibility, impact resistance, in particular low-temperature impact resistance, transparency, gloss, stress-whitening resistance, and the balance thereof; various molded articles having the above properties; a propylene composition which is suitable for a base resin for the polypropylene composition; and a process for the production thereof. The propylene composition comprises a propylene homopolymer and a propylene-ethylene copolymer, the intrinsic viscosity of the copolymer ([.eta.].sub.RC) is in the range of 1.7 to 2.8 dl/g, the intrinsic viscosity ratio of the homopolymer to the copolymer ([.eta.].sub.RC /[.eta.].sub.pp) is in the range of 0.7 to 1.2 and a product [(W.sub.PP /W.sub.RC).times.([.eta.].sub.RC /[.eta.].sub.pp)] of the weight ratio (W.sub.PP /W.sub.RC) of the homopolymer to the copolymer and the intrinsic viscosity ratio thereof is in the range of 1.0 to 3.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.