Abstract: A polystyrene foam sheet comprising a polystyrene resin which contains 1 to 15 wt % of a rubber component having a majority of particle sizes less than about 0.45 microns has been found to be superior for forming deep drawn articles. Optionally one or two films may be extrusion coated or laminated to the foam sheet prior to thermoforming. Also disclosed is a method for thermoforming the foam sheet. Preheat the sheet, clamp the sheet between the matched male and female mold members, move the members into final position while applying a vacuum through both members to both sides of the foamed sheet and then chill formed foam to set a final shape.

Abstract: A multi-layer container suitable for use in microwave cooking of food comprising a substrate layer of a thermoplastic polymer that is not suitable for contact with foods or hot foods, and an inner protective layer designed to contact the food, said inner layer comprising a blend of a styrene/maleic anhydride copolymer and a polymer selected from the group consisting of polystyrene, rubber modified polystyrene, polymethyl methacrylate, rubber modified polymethyl methacrylate, polypropylene, and mixtures thereof.

Abstract: A cannister has an inhalation chimney mounted thereon, and includes an inlet and an outlet. Several layers of KO.sub.2 particles are contained in the cannister, separated by parallel screen assemblies, the upper two screen assemblies being connected by a vertical bypass screen near the cannister inlet. The layered KO.sub.2 bed is effective to remove CO.sub.2 from exhaled breathe, and generate oxygen for recharging the air prior to inhalation. The cannister inlet is connected by a flexible hose to the exhalation side of a breather mouthpiece, the inhalation side of the mouthpiece being connected to the upper end of the inhalation chimney. Communication between the cannister outlet and the lower end of the inhalation chimney is provided by a breather bag, fitted with a set of baffles to define a tortuous flow path for cooling the processed air. A collector mounted at the cannister outlet prevents liquid KO.sub.2 from entering the breather bag.