Heterophasic Copolymers Research Articles

The reactor granule technology: A revolutionary approach to polymer blends and alloys

AbstractThe new plastic materials frontier in general and in thermoplastic polyolefins in particular developed in the last years and into next century are and will be represented by polymer alloys. The new trend in polymer alloy is to obtain them from monomer directly in the reactor, replacing the polymer blends previously made by mechanical melt extrusion of preformed polymers. It discloses new opportunities in term of properties together with better economics. The reactor granule technology developed by Himont/Montecatini produces spherical form alloys that are a synergistic combination of morphological, chemical, rheological and thermomechanical properties, by which the polymer finds many applications not previously suitable for polypropylene or polyethylene. In reactor granule technology the multimonomer random and heterophasic copolymers can be produced primarly within the granule enclosed by a solid polymer skin free from sticky nature, typical of polymers obtained by gas‐phase technology and causing many problems like particles agglomeration and fouling.

Photoinitiated oxidation of heterophasic ethylene–propylene copolymers. I. Comparison of oxidation products

AbstractDetailed photoproducts from photoirradiation of heterophasic ethylene‐propylene copolymers and their fractions have been compared by infrared spectroscopy combined with chemical derivatization. The oxidized films were treated with gaseous NH3, SF4, and NO for the rapid identification and resolution of the various carbonyl species, alcohols, and hydroperoxides. The photoproduct formation depends upon the composition of the sample. The heterogeneities in thin films were also determined by micro FTIR spectroscopy. © 1993 John Wiley & Sons, Inc.

Heterophasic Polypropylene Copolymer Resins for Fabric Coating

Extrusion coating resins have been developed that apply HIMONT's high melt strength technology to heterophasic copolymers. The resulting materials have excellent processability, good coverage of fabric voids, and more impact-resistant coatings than other propylene-based polymers.