Open-celled polyurethane foams containing graphite which exhibit low thermal conductivity
AssigneeDow Global Technologies LLC
InventorsRonald Van Den Bosch, Hans A. G. De Vos
Life of this patent
Estimating the term…
Abstract
A process is disclosed for preparing an open-celled rigid polyurethane foam by reacting an organic polyisocyanate with a polyol in the presence of a blowing agent, a cell opening agent and exfoliating graphite, wherein the thermal conductivity of the foam is from 28 to 35 mw/mk. Such foams are applicable in the construction industry where it is desired to have a foam having flame retardation properties and a low thermal conductivity.
Claims12
A process for preparing an open-celled rigid polyurethane foam having an overall density of 10 to 45 kg/m3 by reacting an organic polyisocyanate with a polyol in the presence of a blowing agent, a cell opening agent and an effective amount of exfoliating graphite.
The process of clalm 1 wherein the blowing agent is water, an organic blowing agent, a hydrocarbon or a combination thereof.
A polyurethane foam having a density of 10 to 35 kg/m3 and a thermal conductivity of 28 to 35 mw/mk wherein the foam contains greater than 50 percent open-cells having a diameter of less than 300 μm and contains 2 percent or more by weight of exfoliating graphite.
Dependencies are inferred from the claim text.