Peroxide modified PP/PE blends with superior melt strength
US5639818A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1994 |
| Grant date | Jun 17, 1997 |
| Priority date | — |
| Expiry date | Mar 11, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2023/42
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The instant invention is directed to a process for preparing peroxide modified polypropylene/polyethylene blends that have superior extrusion coating properties. More specifically, the peroxide modified PP/PE blends produced by the instant invention exhibit a pronounced viscosity upturn at low frequencies (about <1.0 rad/sec) in the dynamic rheological data. Specifically, the blends show an increase in their dynamic complex viscosity, .eta.*, and dynamic storage modulus, G' values at frequencies of less than about 1.0 rad/sec. The present invention also relates to peroxide modified PP/PE blends that are produced from the process of the instant invention. Such polymeric blends that are produced from the inventive method exhibit superior dynamic theological properties, especially melt strength, compared with prior art blends. Moreover, the peroxide modified PP/PE blends of the present invention show markedly reduced draw resonance behavior. Thus, the PP/PE blends of the present invention having the above-identified characteristics will be suitable for a wide variety of applications, such as thermoforming, blow molding and, preferably, extrusion coatings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.