Abstract: A method of using an improved membrane to separate gases is described. The membrane is surface treated by exposing at least one surface of a semipermeable membrane to gaseous fluorine or a combination of gaseous fluorine and sulfur dioxide. The modified membrane contains fluorine or fluorine and sulfur oxide functionalities at the membrane surface, thereby enhancing the gas separation properties of the membrane. The membrane may be used to separate gas mixtures such as carbon dioxide and methane, oxygen and nitrogen, or nitrogen and methane.

Abstract: The invention is a method of separating a gas comprising oxygen, nitrogen or carbon dioxide from a mixture of gases containing oxygen, nitrogen or carbon dioxide wherein the method comprisesA. contacting the gas mixture with a membrane containing a thin dense discriminating layer comprising a polymer of sulphonated polyether sulphone under conditions such that oxygen, nitrogen or carbon dioxide selectively permeates through the membrane to the other side of the membrane; and,B. removing the permeated oxygen, nitrogen, or carbon dioxide from the other side of the membrane.The membranes useful in this invention demonstrate good selectivity for oxygen over nitrogen and carbon dioxide over light hydrocarbons and nitrogen over light hydrocarbons. Furthermore, the permeabilities of oxygen and carbon dioxide through these membranes are quite good.

Abstract: An apparatus and process for continuously producing a co-extruded wrapped food product is disclosed. The apparatus includes a double nozzle extruder member having inner and outer tubular barrels arranged with the inner barrel being positioned centrally within the outer barrel. First and second hoppers are adapted to supply a filling food material and a moldable food material to their respective barrels. Feeding means continuously move the two food materials from each of their hoppers through the barrels to form a filled ribbon of food material. Means is included for continuously shaping, cutting and sealing the ribbon to form the wrapped food product in a single step and without any waste. The shaping, cutting and sealing means is adapted to receive the ribbon of food material and continuously produce the final wrapped food product.

Abstract: The present invention relates to high impact strength polymeric compositions comprising acrylonitrile-butadiene-styrene terpolymers, carbon black and a nitrile rubber additive. The presence of the rubber additive restores the impact strength of the acrylonitrile-butadiene-styrene compositions, which is normally substantially degraded by the addition of carbon black.