Abstract: The protection of food products from contamination by food pathogens, particularly Listeria monocytogenes, by incorporation of 6 to 50 ppm and preferably 6 to 15 ppm of beta-acids, as extracted from hops, into such food products.

Abstract: Aromatic polyimide gas separation membranes containing the repeating unit: ##STR1## where --Ar-- =is ##STR2## or mixtures thereof, ##STR3## or mixtures thereof Where --X, X.sub.1, X.sub.2, and X.sub.3 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms preferably methyl or ethyl, --Z is --H, --X, --X.sub.1, --X.sub.2, or --X.sub.

Abstract: A process for the dyeing of polymers of propylene, butene-1 and 4-methyl-pentent-1 is disclosed. The process involves contacting articles of the polymer with an aqueous dyebath containing a basic dye in a concentration of at least 0.4 g/l and at a pH of at least 5.0. The temperature of the aqueous dyebath is at least 90.degree. C. The article is maintained in contact with the dyebath for at least 10 minutes. The polymer of propylene is preferably a blend of 50-99 parts of a homopolymer of propylene or copolymer of propylene and ethylene with 1-50 parts of a zinc ionomer or graft copolymer of a hydrocarbon alpha-olefin with an alpha-olefin having carboxylic acid or carboxylic acid anhydride. Dyed polymers are obtained.

Abstract: Shell-less hollow fiber gas permeators are disclosed wherein the hollow fibers are arranged in a bundle of paallel fibers embedded in a tube sheet at both ends. The tube sheets are fitted with caps to provide a pressure chamber which have ports for fluid communication. The end caps and tube sheets are mounted on a central rod to hold them rigidly in position. A plurality of the permeators are arranged in an array within an enclosure with ends in a common plane and the ends are in fluid communication with each other. The enclosure is provided with a vent and in a preferred aspect air is drawn over the permeators.

Abstract: Hollow fiber separation membranes are bundled in groups of 5-350 membranes and helically wound with a 20-120 denier yarn. The bundle is more readily handled when making permeators using dry membranes and there is significantly reduced fiber breakage and damage.

Abstract: Highly soluble, optically transparent aromatic polyimides of the following formula are disclosed: ##STR1## where --X and --X.sub.1 are independently primary or secondary alkyl groups having 1 to 6 carbon atoms,--X is different than --X.sub.1,--Y is independently --H, or --Z,--Z is independently --Cl, --Br or --I,r=0-100% of r+t, ands=100%t=100% -r of r+t are disclosed.

Abstract: High impact resistant polyamide resins containing a polyamide matrix comprising at least one amorphous polyamide and dispersed particles of a toughener formed of a blend of ethylene, propylene, diene monomer rubber containing grafted succinic anhydride groups and an ionomer derived from ethylene, an alkyl acrylate and acrylic acid or methacrylic acid. The toughener has a particle size of less than about 360 nm, as determined by a small angle x-ray scattering technique. The toughener is present in the resin in the amount of at least 15% by weight.