Dow Global Technolgoies LLC

Wasserman, Scott, H.

Maki, Sandra

David J Frankowski

Stéphane Costeux

Chau Van Vo

Lawrence S Hood

Scott Hanley Wasserman

Van-Chau Vo

Brian H Deshano

Anson Wong

Sandra Maki

Rodney E Ginger

An extruded polymer foam has a polymer matrix with styrene-acrylonitrile copolymer and infrared attenuator and cell having an average size in the foam vertical direction of 150 micrometers or less, a ratio of vertical cell size to extrusion direction cell size that is greater than one and a cell anisotropic ratio that is greater than 1.1; the foam having a P-Ratio of 0.7 or less, less than 0.2 moles of hydrocarbon blowing agent in the cells per kilogram of foam; a density of 20-48 kilograms per cubic meter and a 25-year thermal conductivity that is 0.030 Waters per meter-Kelvin or less when free of fluorinated blowing agents and less than 0.029 Watts per meter-Kelvin when containing fluorinated blowing agent.

Thermally insulating foam with vertically elongated cells

Prepare polymeric foam articles having low yellowing using a styrene-acrylonitrile copolymer that contains less than 145 weight-parts acrylonitrile dimer and less than 8,500 weight-parts acrylonitrile trimer per million weight parts acrylonitrile copolymer.

Styrene-acrylonitrile copolymer foam with minimal yellowing

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Freeland, MI, United States of America

David J Frankowski