Flexible compositions based on propylene polymers
US6803415B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 2002 |
| Grant date | Oct 12, 2004 |
| Priority date | — |
| Expiry date | Jan 8, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2314/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The flexible compositions having no elastomeric fractions comprise:A) from 10 to 90 parts by weight of random copolymer of propylene and at least one comonomer selected from ethylene and C4-C8 alpha-olefins having a melting point of at least 100° C. and not exceeding 140° C. and a flow index measured at 230° C. under a weight of 2.16 kg (ASTM standard D1238, 1986) of from 0.5 to 15 g/10 min, andB) from 90 to 10 parts by weight of plastomer prepared with participation of a metallocene catalyst and consisting of a random copolymer of ethylene and at least one C3-C10 alpha-olefin having a density of from 0.860 to 0.920 g/cm3, a melt flow index measured at 190° C. under a weight of 2.16 kg (ASTM standard D1238, 1986) of from 0.5 to 30 g/10 min, and a molecular mass distribution Mw/Mn of at most 4.These compositions provide an excellent compromise between flexibility and low-temperature impact resistance and heat resistance. They are suitable for producing flexible mouldings and very particularly for the manufacture by extrusion of films, of flexible sheeting, and of cables.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.