Ethylene-propylene copolymers
US4424330A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 27, 1981 |
| Grant date | Jan 3, 1984 |
| Priority date | — |
| Expiry date | May 27, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/916
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A copolymer based on ethylene and propylene, having a density of between 0.933 and 0.946 g/cm.sup.3 and a melt index of between 2 and 10 dg/min, wherein the copolymer has from 3 to 27 alkyl groups per 1000 carbon atoms in the molecule and wherein its density .rho. and its proportion m of alkyl groups in the molecule satisfy the relationship 0.948.ltoreq..rho.+0.71 m.ltoreq.0.9525. The copolymer is produced by feeding a flux comprising from 80 to 95% by weight of ethylene and from 5 to 20% by weight of propylene into at least one reactor in stationary operation, the reactor having at least one reaction zone; and copolymerizing the ethylene and propylene in the reactor at a pressure of from 300 to 2500 bar and a temperature of from 180.degree. to 320.degree. C. in the presence of a Ziegler type catalyst system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.