Transparent and translucent crosslinked propylene-based...

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 210/06 (2006.01) C08F 8/00 (2006.01) C08F 210/18 (2006.01) C08L 23/16 (2006.01)

Patent

CA 2545203

The present invention provides a crosslinked propylene-based elastomer having an isotactic propylene triad tacticity of from 65 to 95%, a melting point by DSC equal to or less than 110~C, a heat of fusion of from 5 J/g to 50 J/g, and a haze% per 100 mil thickness of 95 or less, and comprising at least 75 wt% propylene-derived units, at least 5 wt% ethylene-derived units, and optionally 10 wt% or less of dime-derived units. In an embodiment, the present invention is a blend of a continuous phase of the crosslinked propylene-based elastomer and a dispersed phase of a crystalline polymeric compound. The present invention also provides elastomeric compositions comprising a crosslinked propylene-based elastomer as described herein and 100 parts by weight or less of a pigment per 100 parts of polymer. The present invention also provides films, fibers, nonwovens, molded objects, and extruded forms which include any of the inventive compositions described herein.

L'invention décrit un élastomère propylénique réticulé qui présente une tacticité de triade propylénique isostatique comprise entre 65 et 95 %, un point de fusion par DSC égal ou inférieur à 110·C, une chaleur de fusion comprise entre 5 J/g et 50 J/g, et un trouble de 95 % maximum par 100 mil d'épaisseur, et qui contient au moins 75% en poids d'unités propyléniques, au moins 5% en poids d'unités éthyléniques, et éventuellement 10% en poids maximum d'unités diéniques. Dans un premier mode de réalisation, l'invention est un mélange d'une phase continue de l'élastomère propylénique réticulé et une phase dispersée d'un composé polymère cristallin. Par ailleurs, l'invention décrit des compositions élastomériques qui contiennent un élastomère propylénique réticulé, tel que décrit ci-dessus, et 100 parties en poids maximum d'un pigment par 100 parties de polymère. De plus, l'invention décrit des films, des fibres, des non-tissés, des objets moulés ainsi que des formes extrudées qui contiennent l'une ou l'autre des compositions de l'invention.

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