Apparatus for reducing waste material in which substantially parallel shafts carry cooperating material reducing cutters for either direction of rotation of the shafts. There are selectively positionable cages at the discharge with comb teeth in position to cooperate with the cutters in either direction of cutter rotation, and there is a control system for operating the cutters and cages such that...

Centrifuge comprising two drums (1,2) having coaxial horizontal axes. The inner drum carries a set of dishes (33) and, on the periphery, a scraper screw (36). A sludge chamber (23) is provided at one end of the outer drum (2) and, by way of passages (28) adapted to be closed by a discharge device, is in communication with the outside. The centrifuge is provided with a double energy recuperation de...

Novel substituted phenoxypropionates of the formula (I) in which R1 and R2 each independently are a hydrogen atom or a C1 to C6 alkyl group, X is a hydrogen or halogen atom, nitro, C1 to C6 alkyl or C1 to C6 alkoxy, a and n each independently are 1 or 2, and Ar is a group of the formula wherein Y is a trifluoromethyl group, a halogen atom or a nitro, cyano or C1 to C6 alkyl ...

PURPOSE:To enable to measure the stroke of a piston against a cylinder by providing a concave part on the end face of the piston for obtaining the rate between propagation times of ultrasonic waves reflected and returned by the concave part and a non-concave part. CONSTITUTION:The ultrasonic wave transmitted from an ultrasonic-wave transmitting/receiving unit 5 provided on the side of a cylinder 1...

A flexible polyurethane foam for sound insulation purposes has viscoelastic properties in the temperature range of - 20 to + 80 DEG C and a loss factor of at least 0.3, in the case of a density of less than 90 kg/m<3> and a modulus of elasticity of less than 10<6>N/m<2>. The foam is obtained by reacting a polyisocyanate with a polyol, in which at least one component has an OH-number of 180 to 400....

A dust collecting filter is provided with a zigzag shaped filter member having small meshes and comparatively large flowing resistance, which is disposed within a casing so that the zigzag shaped cross section thereof extends in the fluid flowing direction. Other filter members having comparatively small flowing resistance are charged within the spaces defined by the zigzag shaped filter member.

Superplasticizers for cementitious compositions are produced from a raw material mixture of (1) naphthalenesulfonic acid formaldehyde condensate and (2) free sulfuric acid using a 1-step process or a 2-step process. In the 1-step process, the mixture is neutralized with a zinc compound such as zinc oxide to a pH of about 2 to obtain a superplasticizer mixture of the free acid of the naphthalenesul...

Novel liquid cementitious slurry coating compositions of portland cement, flyash and polymeric emulsions and optionally containing liquid foam and/or reinforcing fibers are applied to solid cellular monoliths to make weather resistant insulative construction boards and units. The slurry coatings are prepared and applied to the surface(s) of cellular monoliths such as beadboard by roller coating, s...

Humid aged adhesion of rubber containing a phenol formaldehyde resin bonded directly to bright steel cord is improved by coating the bright steel cord with an amino functional organo silane.

Compounds of the formula wherein n is 0 or 1; A is methylene, vinylene or ethylene optionally substituted by lower alkyl; B is alkylene; R1 is an optionally substituted alkyl, phenyl or naphthyl group, or a cycloalkyl or pyridyl group; and R2 is hydrogen or acyl; and non-toxic, pharmacologically acceptable acid addition salts thereof. The compounds as well as their salts are useful as ...

This disclosure describes the treatment of cellulose acetate butyrate contact lenses which are rendered hydrophilic by contacting said lenses with a treating agent which increases the hydrophilicity of said lenses. The treating agent is ammoniacal salt, alkali-metal hydroxide, strong mineral acid, benzene sulfonic acid, alkali metal borohydride or organometallic compound.

A method of preparing nitrile elastomer surfaces for bonding by epoxy adhesives is presented. A treating solution comprising a dilute concentration of a mineral acid such as HCl in a carrier comprising water and either alcohol or ketones is prepared. The treating solution is applied to the elastomer surface with the surface being hydrolyzed in a mild manner thereby providing an improved adherable ...

Cellular ceramic bodies are produced by frothing a crystal-containing, ion-exchanged gel and setting the gel. An aqueous gel is prepared from a water-swelling mica and is blended in conjunction with a large cation donor, e.g., a potassium salt or silicate glass, and a surfactant to effect frothing of the gel by a shearing action and exchange of large cations with lithium and/or sodium ions from th...

Expandable styrene-maleic anhydride copolymer particles which comprises a copolymer resin obtained by reaction of a styrene-maleic anhydride copolymer with a hydroxy compound and further impregnated with a volatile blowing agent.

A nylon foam product produced by frothing in an intensive mixer a reaction mixture of catalyst, caprolactam and polyol prepolymer in the presence of a surfactant and gaseous frothing agent.