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Nanocellular foam with solid flame retardant

United States Patent

9,822,230
November 21, 2017
View the Complete Patent at the US Patent & Trademark Office
Prepare nanofoam by (a) providing an aqueous solution of a flame retardant dissolved in an aqueous solvent, wherein the flame retardant is a solid at 23.degree. C. and 101 kiloPascals pressure when in neat form; (b) providing a fluid polymer composition selected from a solution of polymer dissolved in a water-miscible solvent or a latex of polymer particles in a continuous aqueous phase; (c) mixing the aqueous solution of flame retardant with the fluid polymer composition to form a mixture; (d) removing water and, if present, solvent from the mixture to produce a polymeric composition having less than 74 weight-percent flame retardant based on total polymeric composition weight; (e) compound the polymeric composition with a matrix polymer to form a matrix polymer composition; and (f) foam the matrix polymer composition into nanofoam having a porosity of at least 60 percent.
Chen; Liang (Midland, MI), Kelly-Rowley; Anne M. (Midland, MI), Bunker; Shana P. (Midland, MI), Costeux; Stephane (Midland, MI)
Dow Global Technologies LLC (Midland, MI)
15/ 109,935
20170002162
March 18, 2015
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.