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AssigneeDow Global Technologies LLC
InventorsKevin R. Hughes, Robert L. Sammler, Kyung W. Suh, Jin Zhao, Johan A. Thoen, Martin H. Tusim
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The present invention relates to a foam, a process for preparing the foam and an article containing the foam. The foam contains a coupled propylene polymer and has a density in of from 9.6 to 801 kg/m3 and has either a foamability factor of more than 1.8 to less than 2.8 and an open cell content less than 20 percent, or a foamability factor of at least 2.8 and less than 15 and an open cell content of less than 50 percent. The process includes heating a coupled propylene polymer having a melt flow rate from 0.2 to 20 g/10 min and a melt strength of at least 39 cN to a molten state to produce a molten polymer material and mixing said molten polymer material with a blowing agent under conditions to produce a foamed material having a density in the range of from 9.6 to 801 kg/m3.
A foam comprising a coupled propylene polymer and having a density in the range of from 9.6 to 801 kilograms per cubic meter and having either a foamability factor of more than 1.8 to less than 2.8 and an open cell content less than 20 percent, or a foamability factor of equal to or more than 2.8 and less than 15 and an open cell content of less than 50 percent.
A process for preparing a foam comprising heating a coupled propylene polymer having a melt flow rate from 0.2 to 20 grams per 10 minutes and a melt strength of at least 39 centiNewtons, optionally mixed with a nucleating agent, to a molten state to produce a molten polymer material, and mixing said molten polymer material with a blowing agent under conditions to produce a foamed material having a density in the range of from 9.6 to 801 kilograms per cubic meter.
Dependencies are inferred from the claim text.