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Nanocellular thermoplastic foam and process for making the same

United States Patent

September 29, 2015
View the Complete Patent at the US Patent & Trademark Office
Prepare a thermoplastic polymer foam having a porosity of 70% or more and at least one of: (i) an average cell size of 200 nanometers or less; and (ii) a nucleation density of at least 1.times.1015 effective nucleation sites per cubic centimeter of foamable polymer composition not including blowing agent using a foamable polymer composition containing a thermoplastic polymer selected from styrenic polymer and (meth)acrylic polymers, a blowing agent comprising at least 20 mole-percent carbon dioxide based on moles of blowing agent and an additive having a Total Hansen Solubility Parameter that differs from that of carbon dioxide by less than 2 and that is present at a concentration of 0.01 to 1.5 weight parts per hundred weight parts thermoplastic polymer.
Zhu; Lingbo (Midland, MI), Costeux; Stephane (Midland, MI), Patankar; Kshitish A. (Midland, MI), Moore; Jonathan D. (Midland, MI)
Dow Global Technologies LLC (Midland, MI)
14/ 421,851
September 13, 2013
This invention was made with U.S. Government support under contract DE-EE0003916 awarded by the Department of Energy. The U.S. Government has certain rights in this invention.