A process for the preparation of a compound of the formulae (Ia) and/or (Ib): wherein R1 and R2 are independently substituted or unsubstituted hydrocarbon groups or are joined together so as to form a carbocyclic or heterocyclic ring, and R3 is a substituted or unsubstituted hydrocarbon group; which process comprises the ring-closing cyclization of a compound of the formula (II):

Process and apparatus for manufacturing a pneumatic tire comprising a carcass (1) already shaped in the form of a cylindrical tube having carcass piles faithfully deformed around the base and the sides of the bead cores (2). The drum for torically shaping the carcass comprises means for receiving by telescoping the carcass tube (1) and opposite sectors (10, 13) for clamping between them the portio...

Apparatus and a method for removing suspended particles from water in a circular tank having a distribution and flocculation chamber immersed in the tank of water and carried circularly around the tank by a carriage. Flocculating material and inlet water are introduced into the body of water from the moving flocculating chamber at the same rate as clarified water is discharged through a filter sub...

METODO, INSTILACION Y APARATO CORRESPONDIENTE PARA SEPARAR LOS CAPARAZONES DE LOS CRUSTACEOS.COMPRENDE UN DEPOSITO (20) DE VACIO, CONECTADO MEDIANTE UN TUBO (44) A UN TANQUE (64) PROVISTO DE UN TUBO DE VACIO (66). EXISTE UNA CUBA DE CALENTAMIENTO (2) Y UN TRANSPORTADOR (4), HASTA UNA TOLVA (68) QUE CONDUCE A UNA CAMARA DE VACIO (70), LA CUAL ESTA SITUADA ENCIMA DEL DEPOSITO DE VACIO (20), EN CUYO ...

A means and method for applying innerliner material to a tire building drum and more particularly to a means and method for cutting and applying the innerliner material and further allowing for stock width measurement and precise centering without the possible edge distortion of known guiding systems.

A means and method for applying innerliner material to a tire building drum and more particularly to a means and method for cutting and applying the innerliner material and further allowing for stock width measurement and precise centering without the possible edge distortion of known guiding systems.

In the continuous production of laminates, especially laminated building boards, one or more base sheets impregnated with phenoplast/aminoplast resin mixture in the presence of acid donor curing agents are pressed together at an elevated curing temperature with decorative sheets impregnated with aminoplast resin in the presence of acid donor curing agents.

The subject invention is a foamable composition based on a blend of a carbon monoxide- or sulfur dioxide-containing ethylene copolymer and a vinyl or vinylidene halide polymer, and the closed-cell foamed article produced therefrom.

PROCEDIMIENTO PARA LA FABRICACION DE BOLITAS POLIMERAS VESICULADAS.COMPRENDE LAS SIGUIENTES OPERACIONES: PRIMERA, SE PREPARA UNA FASE OLEOSA QUE COMPRENDE UNA RESINA DE POLIESTER QUE CONTIENE CARBOXILO INSOLUBLE EN AGUA Y RETICULABLE EN SOLUCION CON UN MONOMERO COPOLIMERIZABLE CON DICHA RESINA; SEGUNDA, SE PREPARA UNA FASE ACUOSA QUE COMPRENDE UN AGENTE EMULSIONANTE EN SOLUCION ACUOSA; TERCERA, SE...

PROCEDIMIENTO PARA LA FABRICACION DE UNA HOJA DE PLASTICO A BASE DE POLIPROPILENO, ORIENTADA BIAXIALMENTE, CON UNA ADICION DE UNA RESINA NATURAL O SINTETICA QUE POSEE UN PUNTO DE REBLANDECIMIENTO COMPRENDIDO ENTRE 70 Y 170 GRADOS Y CON UN MODULO DE ELASTICIDAD EN SENTIDO LONGITUDINAL COMPRENDIDO ENTRE 4.000 Y 6.000 N/MM CUADRADOS. COMPRENDE LAS SIGUIENTES OPERACIONES: PRIMERA, SE EXTRUYE EN FUSION...

PROCEDIMIENTO PARA LA OBTENCION DE SOLUCIONES HOMOGENEAS, HILOS Y FIBRAS, CONFORMABLES A BASE DE POLICLORURO DE VINILO.COMPRENDE LAS SIGUIENTES OPERACIONES: EN UNA PRIMERA ETAPA SE HILAN EN SECO SOLUCIONES A BASE DE POLICLORURO DE VINILO DE CONCENTRACION COMPRENDIDA ENTRE UN 15 Y UN 35, EN UN MEDIO DISOLVENTE QUE TIENE UN PARAMETRO DE SOLUBILIDAD S COMPRENDIDO ENTRE 8 Y 11 Y UNA CONSTANTE DIELECTR...

Rosin-based foams suitable for surface application to fibrous substrates such as paper and paperboard are obtained by aerating an aqueous solution having a pH of at least 8 and containing 0.1 to 5% of a water-soluble salt of rosin or fortified rosin and 0.02 to 5% of a water-soluble, amine-containing polymer compatible with the salt, the weight ratio of the salt to the polymer being within the ran...

A hydraulic cement mix including hydraulic cement, aggregate, sufficient water to effect hydraulic setting of the cement, and an additive comprising a mixture of an alkali or alkaline earth or ammonium salt of thiocyanic acid, such as sodium, potassium, lithium, calcium or magnesium thiocyanate, and an alkanolamine, such as triethanolamine, the additive being present in an amount sufficient to inc...

The application of a disc brake is initiated by operation of a pull-rod (21) which is operative to move a pressure plate angularly, in turn to cause the plate to move axially and clamp a rotatable brake disc against a face in a housing. The outer end of the pull-rod (21) is in screw-threaded engagement with a rotatable sleeve (10 min ) which is axially slidable to a limited extent in a further hou...

The application of a disc brake is initiated by operation of a pull-rod (21) which is operative to move a pressure plate angularly, in turn to cause the plate to move axially and clamp a rotatable brake disc against a face in a housing. The outer end of the pull-rod (21) is in screw-threaded engagement with a rotatable sleeve (10 min ) which is axially slidable to a limited extent in a further hou...

In an optical device an objective is moved axially along its optical axis relative to a frame in a parallel guide by means of first electro-magnetic actuating means connected to the objective and second electromagnetic actuating means arranged on the frame, which first and second actuating means co-operate axially with each other by means of a magnetic field which is oriented transversely of the o...

A grease composition suitable as a lubricating sealant which is resistant to aprotic solvents such as chloroform and carbon disulfide comprises glycerine, fumed silica, polyethylene glycol and a minor amount of water. A preferred grease composition is one in which the amount of glycerine ranges is from 50 to 95 weight % of the total composition, the amount of fumed silica is from 1 to 25% by weigh...

A component system for surgical cement, based on at least one acrylic monomer and at least one acrylic polymer comprising a powder and a liquid. The powder comprises: (a) from 50 to 70 weight percent of at least one acrylic polymer having a particle size of between 20 and 150 microns; and (b) a polymerization initiator. The liquid comprises: (a) from 30 to 50 weight percent of a mixture comprising...

A photopolymerizable composition which comprises at least one ethylenically unsaturated polymerizable monomer, at least one selected ketone and at least one organic peroxide. The compositions are useful in the preparation of adhesives, paints and varnishes particularly in dental applications and exhibit reduced air inhibition on being cured by visible radiation in the range 400 m mu to 500 m mu .