Abstract: This invention relates to a process for the production of elastic, open-cell flexible slabstock polyurethane foams comprising reacting at an isocyanate index less than about 80 one or more polyisocyanates selected from the group tolylene diisocyanates, hexamethylene diisocyanate, and isophorone diisocyanate, with compounds containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight of about 400 to about 10,000, in the presence of water as blowing agent in a quantity of about 5 to about 15 parts by weight for every 100 parts by weight of the isocyanate-reactive compound. The process may optionally include chain-extending and crosslinking agents containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight of about 32 to about 399, and may optionally be carried out in the presence of other blowing agents, catalysts, auxiliaries, and additives.

Abstract: This invention relates to liquid urethane-modified polyisocyanate compositions obtained by reaction of polyisocyanates or polyisocyanate mixtures of the diphenylmethane series containing from about 50 to about 100% by weight diisocyanatodiphenylmethane isomers with substoichiometric quantities of polyether polyol compositions having an average hydroxyl equivalent weight of about 500 to 3000 and an average hydroxyl functionality greater than about 4, optionally followed by mixing the initially formed reaction product with urethane-free polyisocyanates or polyisocyanate mixtures of the diphenylmethane series containing from about 40 to about 100% by weight diisocyanatodiphenylmethane isomers. This invention also relates to a process for the preparation of such polyisocyanate compositions. The invention further relates to the use of such compositions as the polyisocyanate component in the production of flexible polyurethane foams.

Abstract: The present invention is directed to a process for the preparation of cold setting, flexible, polyurethane, molded foams in a closed mold by reacting a polyisocyanate with a high molecular weight polyol in the presence of about 5 to 15, preferably about 6 to 12 parts by weight of water, based on the weight of the high molecular weight polyol at an isocyanate index below 70.

Abstract: A device for controlling the flow rate of a fuel gas/air mixture, and/or the ratio between the fuel gas and air in such a mixture. The device includes a body having an air inlet, a fuel gas inlet, a fuel gas/air mixture outlet, a gas-control passage in the body, with the cross-sectional area of the gas-control passage being variable via a control device for controlling the flow of fuel gas through the device, and an adjustable air-control passage for adjusting the flow of air through the device. The air-control and gas-control passages are configured and disposed in the body in such a way that they cooperate to also form an area within the body where said controlled fuel gas and air flows are combined and mixed.

Abstract: X-ray diagnostic apparatus is disclosed having a video camera, at least one image memory, a differential stage to produce substraction images by forming the difference between a stored video signal and a video signal chronologically following the former signal, an evaluation circuit for the time evaluation of changes in the subtraction images, and a video monitor. The evaluation circuit includes a time memory for storing information about the chronological flow of the radiographic contrast medium. The evaluation circuit also includes an additional circuit that repeatedly scans the information stored in the time memory and reproduces only those of the image points on the monitor whose information meet a specified criterion. The value of this criterion is increased step-by-step.

Abstract: A case or housing for a clock, particularly for use in moist rooms, has a cup-shaped dome portion with an opening that is closed by a cover glass at the side of the observer and while a rear portion is closed by a back cover. A support plate which is provided in the dome portion divides the case into several inner spaces and bears a clock movement that can include a dial. In order for the case to be suitable for moist rooms, such as bathrooms, communicating with the case inner space which is adjacent the interior face of the cover glass are air circulation passages which communicate with the outside.

Abstract: In an exemplary embodiment, video images from a television pickup device corresponding to the x-ray images are supplied to an image store and to a difference stage for the purpose of providing subtraction images through difference formation from the stored and the current video signal. The difference stage is connected with a first adder which in turn is connected with a second image store, whose output signal is supplied to a first adder, so that the image point data of the difference stage are summed in the second image store. The output signal of the second image store is supplied to the monitor.

Abstract: Anhydrous or substantially anhydrous formic acid is obtained by hydrolysis of methyl formate, in a process wherein(a) methyl formate is hydrolyzed,(b) the methanol and excess methyl formate are distilled from the hydrolysis mixture obtained,(c) the bottom product of distillation (b), consisting of formic acid and water, is extracted, in a liquid-liquid extraction, with an extractant which in the main takes up the formic acid,(d) the resulting extract phase, consisting of formic acid, the extractant and a part of the water, is subjected to distillation,(e) the top product obtained from this distillation and consisting of all or part of the water introduced into the distillation, and part of the formic acid, is recycled, as vapor, into the lower part of the distillation column of stage (b),(f) the bottom product of distillation stage (d), consisting of the extractant, with or without part of the water, and the greater part of the formic acid, is separated by distillation into anhydrous or substantially anhydrou

Abstract: Manufacture of formaldehyde by oxidative dehydrogenation of methanol in the presence of a silver catalyst using methanol obtained from a condensate derived from the evaporation of aqueous reaction mixtures in the synthesis of urea resins and then treated with caustic soda solution under specific conditions of temperature, pressure, residence time and initial formaldehyde concentration. The formaldehyde obtained is a disinfectant, tanning agent, reducing agent and starting material for the manufacture of synthetic resins, adhesives and plastics.

Abstract: Hydroxylammonium salts are manufactured by a process comprising the catalytic reduction of nitric oxide with hydrogen in a dilute aqueous solution of a mineral acid in the presence of a suspended platinum catalyst at an elevated temperature, wherein the reaction mixture is recycled and the gas mixture, containing nitric oxide and hydrogen, present in the gas space above the reaction zone, is introduced, by means of one or more downwardly directed jets of liquid, consisting of the recycled reaction mixture and issuing from a nozzle orifice, into one or more circulation zones which are present in the reaction zone, are open at both sides, extend in the direction of the entering jet of liquid and are completely covered by the reaction mixture, the reaction mixture leaving the bottom of the circulation zone and containing unconverted gases is deflected, passed upwards in the annular zone externally surrounding the circulation zone, and at the same time reaction mixture of low gas content is recycled from a separa

Abstract: The invention relates to a device for measuring fuel consumption of liquid-fuel engines with variable power yield depending on operating conditions, especially the fuel consumption of automotive engines, characterized by one fuel metering unit each for return fuel flow and/or forward fuel flow, consisting of: a pair of circular chambers; a freely rotating gear, located within each said chamber; tangentially arranged holes extending into each circular chamber and acting as entry and outlet ports for fuel; a light transmitting component, located in the wall of each chamber and closing the chambers in the zones of the teeth of a ring gear; an infra-red transmitter and an infra-red receiver external to each chamber on one optical axis with the light transmitting components; and a measuring circuit connected to each infra-red receiver, and including a pulse transformer and a comparison circuit.

Abstract: The invention relates to a process for the production of dyed filaments from aromatic polyamides which are not modified with acid or basic groups.

Abstract: The invention relates to cross-linkable or cross-linked filaments or fibers of a copolymer comprising at least 65% by weight of acrylonitrile and from 0.5 to 10% by weight of at least one copolymerised N-methylol compound of an unsaturated mono- or bis-urethane or an alkyl ether thereof and, optionally, at least one other copolymerisable monomer.

Abstract: The invention relates to a process for the production of dyed filaments from aromatic polyamides which are modified with acid groups.

Abstract: The invention relates to a process for the production of dyed filaments of aromatic polyamides which have not been modified with acid or basic group.

Abstract: The invention relates to a process for the production of dyed filaments from aromatic polyamides which contain acid groups.

Abstract: The instant invention relates to dihydroxy sulphonates containing ether groups, and to a process for their production. They are obtained by the addition of bisulphites to (poly)alkoxylated dihydroxy alkenes.

Abstract: The instant invention relates to sulphonates containing ether groups and derived from dihydroxy alkane sulphonic acids, and to a process for their production. They are obtained by the addition of bisulphites to (poly)alkoxylated dihydroxy alkenes.