Elastoplastic polyolefin compositions
US5286564A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1991 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Jul 23, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Elastoplastic polyolefin compositions endowed with high flexibility, comprising: PA1 A) 10-50 parts by weight of a homopolymer of propylene with isotactic index greater than 80, or a copolymer of propylene with ethylene, another .alpha.-olefin, or combinations thereof, which copolymer contains over 85% by weight of propylene; PA1 B) 5-20 parts by weight of a copolymer fraction containing ethylene, insoluble in xylene at ambient temperature; PA1 C) 40-80 parts by weight of a copolymer fraction of ethylene and propylene or another .alpha.-olefin, or combinations thereof, and, optionally, minor portions of a diene, said fraction containing less than 40% by weight of ethylene, being soluble in xylene at ambient temperature, and having an intrinsic viscosity from 1.5 to 4 dl/g; the percent by weight of the sum of the (B) and (C) fractions with respect to the total polyolefin composition being of from 50% to 90% and the (B)/(C) weight ratio being lower than 0.4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.