Fast-swelling cyclodextrin foam polymers having a solid foam structure and a large specific surface area are prepared by reacting the cyclodextrins with crosslinking agents and foam-forming blowing agents in one or two steps in the presence of an alkali metal hydroxide and water or in the presence of an acid and water. The resultant foam polymers have a large specific surface area and are distingu...

The invention provides a novel and improved method for the preparation of a cellular foamed body of a vinyl chloride-based resin having a very fine and uniform cellular structure with high productivity in a continuous process. According to the inventive method, a vinyl chloride-based resin is admixed with a nucleating agent and a foam conditioning resin which is a specified acrylic resin or a styr...

Dispersions of colloidal siliceous particles, preferably silica, may be prepared in organic liquids by means of a synergistic mixture of dispersing agents comprising a phosphorus oxy-acid derivatives and a long-chain amine. Dispersions containing a high weight fraction of siliceous solids are possible having a lower viscosity than is normally achieved.

PCT No. PCT/HU81/00027 Sec. 371 Date Mar. 1, 1982 Sec. 102(e) Date Mar. 1, 1982 PCT Filed Jun. 30, 1981 PCT Pub. No. WO82/00134 PCT Pub. Date Jan. 21, 1982.The invention relates to an apparatus for the treatment of liquids, in particular for the biological purification of household sewage and/or industrial sewages containing organic contaminations, furtheron for the aeration and/or sedimentation o...

An aqueous solution of precursors for biologically active glass, support particles coated with the solution, support particles coated with the glass, spheroidal particles of biologically active glass, processes for making the solution, coating the support, and for making the coated support and the spheroidal glass particles. The materials that comprise the biologically active glass are useful in p...

An aqueous solution of precursors for biologically active glass, support particles coated with the solution, support particles coated with the glass, spheroidal particles of biologically active glass, processes for making the solution, coating the support, and for making the coated support and the spheroidal glass particles. The materials that comprise the biologically active glass are useful in p...

A cementitious composition comprising hydraulic cement, not more than 25% of water by weight of the composition, and water soluble or dispersible (co)polymer in a proportion of 1 to 15% by weight of the hydraulic cement in the composition, the cement and (co)polymer being selected such that a test composition comprising 100 parts by weight of cement, 5 parts by weight of (co)polymer, and 16 parts ...

An improved process for the trimethylsilylation of organic compounds with at least one active hydrogen atom with hexamethyldisilazane, the improvement comprising effecting the reaction in the presence of 0.001 to 10 mole percent of a catalyst of the formula X-NH-Y I wherein X and Y are individually an electron-withdrawing group or when X is an electron-withdrawing group, Y is selected from the gro...

A machine manufactures a core for a rotor or stator of an axial flux induction electric machine. The core (16) is formed of metal strip punched at longitudinally spaced locations and wound about a central axis so that the holes form radially extending slots in a radial face of the core. A punching assembly mounted on a frame punch holes through the strip as the strip is drawn through it. - A windi...

PCT No. PCT/HU84/00046 Sec. 371 Date May 22, 1985 Sec. 102(e) Date May 22, 1985 PCT Filed Oct. 5, 1984 PCT Pub. No. WO85/01847 PCT Pub. Date Apr. 25, 1985.Circuit arrangement intended for evaluating currents of 7 or 8 orders of magnitude, particularly in thermoluminescent dosemeter (TLD) evaluation equipment, which comprises a digital gate (12) with a feedback tag (13) and a charging capacitor (11...

An arc electrode assembly comprises a water-cooled metal shaft and a consumable active portion, being interconnected by means of a screw nipple. The metal shaft is surrounded below its clamping area by a protective jacket being detachably arranged about the metal shaft. Between the jacket and the metal shaft a layer of electrically insulating refractory material is arranged which is cooled by the ...

The outer skin of the proposed enclosure is of layered construction, with the outer layer having a coating of light-reflecting paint, then a layer of plastic sheet, a layer of insulating material and an inner layer, all mounted on a framework. - The inner skin is made of polyethylene sheet mounted on a similar inner frame. The space between the two skins is used for the pipework which carries wate...