Thermoformed, extruded sheeting with reduced gloss

Details Thermoformed, extruded sheeting with reduced gloss Thermoformed, extruded sheeting with reduced gloss

C - Chemistry, Metallurgy

08

L

C08L 23/16 (2006.01) B29C 51/00 (2006.01) C08L 23/10 (2006.01)

Patent

CA 2606584

The invention is directed to compositions comprising an elastomer component and a propylene component, and in which the elastomer component comprises at least one ethylene/.alpha.-olefm polymer, optionally containing a diene, and the polypropylene component comprises at least one branched polypropylene. Preferably, the elastomer component has a melt tan delta between about 0.7 and about 8, as measured by parallel plate rheometer at 0.1 rad/sec, 190~C, and 15 percent strain; and the ratio of the ~melt tan delta of the elastomer component" to the "melt tan delta of the propylene component~ is from 0.5 to 4. The invention also provides for method of making such compositions, and to low gloss articles prepared from the same. The inventive compositions are particularly suitable for fabricating thermoformed sheeting with reduced gloss.

L'invention a pour objet des compositions comprenant un composant élastomère et un composant de propylène, et dans lesquelles le composant élastomère comprend au moins un polymère d'éthylène/a-olefm, contenant éventuellement un diène, et dans lesquelles le composant de polypropylène comprend au moins un polypropylène ramifié. De préférence, le composant élastomère possède un angle de perte à la fusion compris entre 0.7 et 8 selon les mesures d'un rhéomètre à plaques parallèles à 0.1 rad/sec, à 19O°C et avec une déformation de 15 %. ; et le rapport entre <= l'angle de perte à la fusion du composant élastomère <= et <= l'angle de perte à la fusion du composant de propylène >= est compris entre 0.5 et 4. L'invention concerne également un procédé de fabrication desdites compositions ainsi que des articles de faible brillance fabriqués à partir desdites compositions. Les compositions de l'invention conviennent particulièrement à la fabrication de feuilles thermoformées de faible brillance.

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