Abstract:
Disclosed is a method for removing arsenic from aqueous systems containing arsenic which includes contacting said aqueous system with an adsorbent material comprising (i) activated bauxite and (ii) aluminum trihydrate, until the arsenic is substantially removed from said aqueous system. The adsorbent material is prepared by the steps including (i) mixing powders of activated bauxite and aluminum trihydrate in the presence of water to form granules; (ii) drying said granules; and (iii) calcining said dried granules.
Abstract:
The present invention provides for an economical thermoplastic bag which may be employed to contain foods during storage and, most importantly, may be used to contain such foods during reheating preparatory to serving. The bag structures of the present invention comprise a two layer laminate structure, the inner bag layer, or that surface layer in contact with the foodstuffs, being formed from a thin film of polyester. The outer layer of the bag laminate, or that surface of the bag which comes into direct contact with the cooking or reheating vessel, comprises a polyacrylonitrile homopolymer. The polyacrylonitrile layer, having a melting or sticking temperature on the order of above 210.degree. C. is stable and will not stick to the vessel side walls while foodstuffs are being reheated therein. Obviously the bag containing foodstuffs is intended to be immersed in a fluid such as water during the reheating operation. Accordingly, the present invention provides laminar bags for the storage and containment of foodstuffs which may subsequently be reheated without first removing them from the bag. In a specific embodiment of the present invention, the bag is constructed from a two-ply laminate comprising an inner film layer of polyester and an outer layer of polyacrylonitrile homopolymer film adhered thereto.
Abstract:
Alkali metal salts of carboxylic acids containing from 2 to 20 carbon atoms are unique in comparison to salts of other elements, including stannous octoate, in their ability to retain catalytic activity when stored in the presence of rigid polyurethane foam precursors.
Abstract:
The friability of rigid polyurethane foams prepared using a chlorine- or bromine-containing polyol is significantly reduced or eliminated by the use of a dimethyltin-S,S'-bis(alkylmercaptocarboxylate) as the polymerization catalyst.
Abstract:
Inorganic hydrated metal oxide and metal silicate gels are supported on the surface of particles of porous material by precipitation therein without significant deposit within pores of the support material and without encapsulating the particles of porous material. Especially preferred hydrated oxides and silicate gels are those of titanium. Preferred porous particles are composed of carbon.These novel composite materials are prepared by spraying an aqueous basic material onto the porous particles and then spraying a concentrated aqueous acidic solution of a source of suitable metallic ions so as to rapidly form a gelatinous precipitate on the surface of the porous particles which remain porous.
Abstract:
Thermoplastic blends having superior capability and homogeneity comprising a poly(phenylene oxide) resin and a resin of poly(methyl ethenyl benzene) isomers in which the predominant isomer is 1-methyl-4-ethenyl benzene, are disclosed. The poly(phenylene oxide) resin can contain substituted phenylene units and the poly(methyl ethenyl benzene) resin can be a polymer of solely methyl ethenyl benzene isomers, or a random, block or graft copolymer comprising 50 weight percent or more of methyl ethenyl benzene iosmers and up to 50 weight percent of other ethylenically unsaturated monomers.
Abstract:
Blends of a preformed poly(methyl ethenyl benzene) polymer or copolymer derived from an isomers of methyl ethenyl benzenes in which 1-methyl-4-ethenyl benzene is the predominant isomers, and up to about 10 weight percent of mineral oil are disclosed.
Abstract:
Blends of a preformed poly(methyl ethenyl benzene) polymer or copolymer derived from an isomers of methyl ethenyl benzenes in which 1-methyl-4-ethenyl benzene is the predominant isomers, and up to about 10 weight percent of mineral oil are disclosed.
Abstract:
The load-bearing characteristics of high resiliency polyurethane foams, as expressed by the loading required to obtain a 65% reduction in thickness, are significantly improved using as the gel catalyst certain diorganotin mercaptides or mercaptoesters.
Abstract:
Cellular polyurethane exhibiting excellent thermal and oxidative stability can be prepared using specified methyl-, allyl-, phenyl- or benzyltin compounds as the polymerization catalyst. These catalysts are hydrolytically stable over extended periods of time, and can therefore be incorporated into precursors or masterbatches for polyurethanes that contain water as the foaming agent.