An industrial wastewater treatment method is described whereby heavy metals dissolved in the wastewater are precipitated as a slurry which, when allowed to settle, will form a sludge containing at least 10 weight percent solids. In the method, an aqueous suspension or solution of a neutralizing agent is introduced into a first reactor. A suspension containing particles of carrier agent is also int...

Resins are prepared from polysulfone and polyethersulfone polymers that bear functional groups derived from compounds that are condensation products of amino-phenols and acid anhydrides. The polymers are prepared by coreacting aromatic compounds holding two hydroxyl groups, aromatic compounds holding two active halogen groups, and the condensation product of amino-phenol and acid anhydride, the co...

1. A bullet-proof glazing unit comprising a laminated glass block surrounded by a metal housing for the sight aperture of an armored vehicle characterized in that a frame-like steel baffle (20; 39; and 46) is placed within the laminated glass block in the half thereof remote from the exposed side.

A transparent film of a vinylidene fluoride copolymer, comprising a dry film of a vinylidene fluoride copolymer having a parallel light transmittance of 85% or higher at a film thickness of 30 microns. The transparent film is obtained by forming a mixture of a vinylidene fluoride copolymer having a specifically high molecular weight with a solvent into a film, preferably by casting, and evaporatin...

A drilling head, preferably a guided drilling head, in particular for a horizontal drilling appliance, in which the drilling head is arranged at the free end of a bar-like element which can be advanced through the soil and in which a rotationally driven hollow drive shaft for the drive of drilling tools arranged at the free end of the drilling head and for the removal of the overburden is arranged...

Resilient foams based on melamine resins are prepared by foaming an aqueous solution which contains a melamine/formaldehyde precondensate, an emulsifier, a volatile blowing agent and a curing agent and then curing the foam. In this process, from 0.2 to 4% by weight of an alkali metal, alkaline earth metal or aluminum salt of an organic, preferably polybasic acid, of a polyphosphoric acid or of a b...

The invention relates to a continuous process for the production of elastic foams based on melamine resins, in which a mixture of an aqueous solution of a melamine-formaldehyde precondensate, an emulsifier, a curing agent and a volatile blowing agent is foamed and cured, and the resulting foam is dried to a water content of less than 10% by weight and then conditioned with the aid of through-flowi...

Mouldings, preferably foams and fibres, based on melamine-formaldehyde condensation resins in which from 1 to 80% by weight of the melamine has been replaced by hydroxyalkylmelamine, preferably hydroxyethylmelamine, have increased mechanical strength.

This operating device, which is used in mechanically actuated clutches, brakes and clutch/ôbrake combinations, has as the most important operating element an operating ring which, on one side, is mounted on a shaft and, on the other side, is supported on rollers. On its circumference, this operating ring (1) has at least two sloping cams (2) supported against rollers (3), the latter being secured ...

Firstly, a pre-exposure film 8 is produced on the surface of which the basic motif is represented transparently to coloured light and the remaining surface is made to be opaque. A single film specimen 4 suitable for silver dye bleaching processes is then pre-exposed with the pre-exposure film 8, then the single film specimen 4 is covered with a transparent plate or film covering the pre-exposed se...

A process for restoring laid roof sealing webs containing phthalic acid esters as plasticisers in which the plasticiser content has dropped in the course of time after laying. In the process, the surface of the web is first cleaned, and from 100 to 500 g of plasticiser paste, depending on the residual plasticiser content per square metre of the laid web, are applied thereto in a single or multiple...

A pre-expanded particle suitable for foaming in a mold comprising polyolefin which has a characteristic property that an inclination of slope line obtained on a graph when logarithmic values of melt tension of the polyolefin are plotted as ordinate and reciprocals of absolute temperature at which the melt tension is measured are plotted as abscissa is less than 1,500 is provided. A foamed article ...

Expandable thermoplastic resin particles having excellent heat resistance, solvent resistance, foamability and moldability comprising a copolymer of 10 to 80% by weight of alpha -methylstyrene, 5 to 50% by weight of acrylonitrile and 0 to 70% by weight of at least one member selected from the group consisting of styrene, methyl methacrylate, vinyl toluene and t-butylstyrene, and an expanding agen...

Multilayer metallic coating is formed on a substrate by applying a base coating composition containing a metallic pigment, applying a clear top coating composition on the base coating wet-on-wet, and curing both coatings simultaneously. The coating compositions contain a film-forming polymer having a plurality of crosslinkable function groups, a crosslinker an organic liquid diluent, internally cr...

Novel amorphous copolymers of mono-olefins or of mono-olefins and non-conjugated dienes with unsaturated derivatives of imides are disclosed. These copolymers containing from 99.9 to 80% by weight of non-polar units derived from at least two mono-olefins containing 2 to 18 carbon atoms, particularly ethylene and propene or ethylene and butene-1, and possibly one or more non-conjugated dienes, and ...

Apparatus for fixing and driving a displacement member (such as a wheel) of a vehicle is disclosed. In particular, an axle journal is coupled to the vehicle chassis. At least one rotating bearing surface is disposed between the displacement member and the axle journal for the rotatable assembly of the displacement member. A drive motor is provided having a stator which is removably attached to the...

A steam turbine rotor includes a plurality of turbine wheels secured to a shaft by an interference shrink fit between each wheel and a corresponding step surface on the shaft. The step surfaces have decreasing radii over a portion of the axial length of the shaft. Each wheel incudes a hub section proximate the shaft and each hub section has a shoulder portion of greater radial dimension than the r...

The invention concerns polymerizable cement mixtures containing (a) polymerizable unsaturated monomers and/or oligomers and/or prepolymers containing acid groups and/or their reactive acid-derivative groups, (b) reactive fillers that can react with these acids or acid derivatives, and (c) curing agents that can be employed especially in dentistry as improved dental mixtures as well as in medicine.

The braking device includes a stator (3) mounted in a torsionally resistant manner on an axle (1) and designed as a claw-pole wheel with associated yoke tube (15) and claw-pole carrier (17,19) arranged on either side of the yoke tube (15). The rotor (9) is rotatably mounted via bearings (5,7) on the same axle (1) as the stator. The multi-pole iron cores (15,17,19,31) of the stator and rotor form a...