Elastomeric Compositions with Improved Resistance to Necking for High Speed Sheet Extrusion Applications

摘要

The present invention comprises (a) a high melt strength material comprising a first polymer selected from the group consisting of elastomeric ethylene / α-olefin polymers and polypropylene polymers, and (b) elastomeric ethylene / α-olefin polymers and polypropylene polymers. A composition comprising a high flow material comprising a second polymer selected from the group is provided. High melt strength materials have a dynamic compound viscosity of more than 175,000 poises (17,500 Pa · s) measured at 1 radian per second and 190 degrees Celsius using parallel plate rheometry techniques, and both high flow materials are at 1 radian and Celsius per second The ratio η * / td of the dynamic compound viscosity η * and tan delta td measured at 190 degrees is less than 2500. It exhibits minimal necking when the composition is extruded at high speed and is particularly useful for sheet making via high speed extrusion.;Elastomers, Ethylene / α-olefin Polymers, Necking Resistance, High Speed Extrusion, High Melt Strength Materials, High Flow Materials