Abstract: The heat insulator of this invention comprises a thermoformed open cell rigid polyurethane foam core enclosed in a gas barrier material and evacuated. The method of this invention comprises heating an open cell rigid polyurethane foam at a temperature not lower than the temperature at which its storage modulus of elasticity begins to decrease and enclosing the thus-thermoformed polyurethane foam in a gas barrier material and evacuating the interior of the enclosure. The heat insulator of the invention is highly heat-insulating and can be snugly applied to irregular surfaces.

Abstract: A polyurethane adhesive composition containing an oxy acid of phosphorus or a derivative thereof, a carboxylic acid or an anhydride thereof, a silane coupling agent and an epoxy resin can serve as an adhesive for manufacturing food packaging materials, for instance, giving bonds having very good bond strength, heat resistance and hot water resistance between a metal foil and a plastic film.

Abstract: A polyurethane adhesive composition containing an oxy acid of phosphorus or a derivative thereof, a carboxylic acid or an anhydride thereof and an epoxy resin can serve as an adhesive for manufacturing food packaging materials, for instance, giving bonds having very good bond strength, heat resistance and hot water resistance between a metal foil and a plastic film.