Abstract: The use of polyamide of high melt flow employed in the impregnation of reinforcing materials taking the form of a cloth of industrial fabrics for the manufacture of composite materials is described. The described use relates to composite materials and their manufacturing processes.

Abstract: The use of polyamide modified by hydroxyaromatic compounds employed in the impregnation of reinforcing materials taking the form of a cloth of industrial fabrics for the manufacture of composite materials is described. The described use relates to composite materials and of their manufacturing processes. Also described, is a process for the manufacture of a composite article including at least: a) a stage of impregnation of a reinforcing cloth with a polyamide composition in the molten state, where the polyamide includes hydroxyaromatic units chemically bonded to the polyamide chain; and b) a stage of cooling and subsequently recovering the composite article.

Abstract: The use of a polyamide including hydroxyaromatic units in order to increase the acid resistance of a polyamide composition is described. A polyamide composition comprising a polyamide that includes hydroxyaromatic units and use thereof for the manufacture of various plastic articles such as, for example, calibrated particles or injection-molded parts is also described. Such a composition is especially useful in the field of the recovery of slurries, liquids and gases present in underground reservoirs, and in particular in the field of the extraction of hydrocarbons, such as crude oil or natural gas.

Abstract: The invention relates to a method for the production of a bituminous binder and a bituminous binder which can be obtained according to said method. The method for the preparation of the bituminous binder comprises a mixing stage of 0.05 5 wt. % acid, 0.5 25 wt. % rubber crumbs and 70 99.5 wt. % bitumen. The invention also relates to bituminous concretes comprising said binder and a method for the production and use thereof.

Abstract: Uses of low molecular mass, non-evolutive polyamide resins for making composite articles are described. Articles obtained from such resins having good mechanical properties, such as rigidity, breaking load, impact resistance, and fatigue behaviour in particular, even when the articles are manufactured according to cycles shorter than those usually used, and without any processing before or after the manufacture of the composite articles, are also described.

Abstract: Novolak resins are incorporated for enhancing the acid resistance of polyamide compositions. Polyamide compositions containing such novolak resins are useful for producing various plastic shaped articles, such as calibrated particles or injection-molded parts, and are particularly useful for the recovery of sludge, liquids, and gases present in underground reservoirs, especially in the field of hydrocarbon extraction such as crude oil or natural gas.

Abstract: High fluidity polyamides are used for the impregnation of reinforcing cloth materials, namely, industrial fabrics, which impregnated cloths are converted into composite shaped articles.

Abstract: Composite propping agents of low density and of high mechanical strength are based on a thermoplastic polymer matrix, in particular having low compressive deformation at high temperatures are especially useful in the field of well fracturing for the recovery of sludges, liquids and gases present in underground reservoirs, and in particular in the field of the extraction of hydrocarbons, such as crude oil or natural gas.

Abstract: The invention concerns method for enhancing the physico-chemical properties of bitumen compositions and novel bitumen compositions with enhanced properties and their uses by mixing a functionalized amorphous silica made by combining amorphous silica with a coupling agent.

Abstract: The invention relates to a method for the production of a bituminous binder and a bituminous binder which can be obtained according to said method. The method for the preparation of the bituminous binder comprises a mixing stage of 0.05 5 wt. % acid, 0.5 25 wt. % rubber crumbs and 70 99.5 wt. % bitumen. The invention also relates to bituminous concretes comprising said binder and a method for the production and use thereof.

Abstract: The subject of the present invention is a process for preparing a bituminous product, characterized in that a compound based on a phosphoric or polyphosphoric acid supported on a mineral oxide of high porosity is used. The subject of the invention is also the bituminous product that can be obtained by the above process, and its uses.

Abstract: The subject of the present invention is a process for preparing a bituminous product, characterized in that a compound based on a phosphoric or polyphosphoric acid supported on a mineral oxide of high porosity is used. The subject of the invention is also the bituminous product that can be obtained by the above process, and its uses.

Abstract: Process for improving the physicochemical properties of bitumen formulations as well as new bitumen formulations with improved properties and their uses The present invention concerns a process for improving the physicochemical properties of bitumen formulations as well as new bitumen formulations with improved properties and their uses.

Abstract: A cement is disclosed containing at least a hydraulic binder and anisotropic polymer particles whereof the modulus of elasticity is not more than 10 GPa and whereof the longest dimension ranges on an average between 0.6 and 6 mm. The cement is used in oil and gas extraction.

Abstract: The present invention relates especially to a composition for manufacturing an article comprising one or more superposed layers each less than 5 centimetres thick, comprising a hydraulic binder and at least one compound chosen from an organic compound comprising at least two hydrophilic functions and a hydrophobic chain, and a polyamide oligomer. The use of these additives in the presence of hydraulic binder allows the manufacture of articles and coatings with good protection against water uptake, satisfactory water resistance and good mechanical properties such as breaking strength.

Abstract: The present invention relates to a process for improving the physicochemical properties of bitumen compositions and also to novel bitumen compositions with improved properties and to their uses in a process for preparing hot bitumen mixes or in a process for preparing cold bitumen mixes.

Abstract: The invention relates to the use of precipitated silica having a DOP oil absorption of at least 260 ml/100 g as a raw material in order to produce a colorant by impregnating said silica with an inorganic pigment in the form of a soluble salt and, in particular, with an inorganic pigment based on soluble iron sulphate. The invention also relates to a colorant that can be produced by calcinating and, optionally, grinding a precipitated silica with a DOP oil absorption of at least 260 ml/100 g which has already been impregnated using an inorganic pigment in the form of a soluble salt, such as a soluble iron sulphate-based inorganic pigment. The colorant thus obtained can be used to dye ceramic materials, such as ceramic tiles, and bituminous or hydraulic binding materials.

Abstract: The invention concerns the use of dispersed precipitated silica as raw material for obtaining a dye, by mixture with an inorganic pigment, in particular with a inorganic pigment based on an iron compound. The invention also concerns a dye obtainable by calcining a dispersed precipitated silica and an inorganic pigment, in particular an inorganic pigment based on an iron compound. The resulting dye can be used for dyeing ceramic materials, such as ceramic roof tiles or floor tiles, and materials containing hydraulic or bituminous binder.

Abstract: The subject of the present invention is a process for preparing a bituminous product, characterized in that a compound based on a phosphoric or polyphosphoric acid supported on a mineral oxide of high porosity is used. The subject of the invention is also the bituminous product that can be obtained by the above process, and its uses.

Abstract: The invention concerns the use of organic fibers having a melting point lower than 300° C., an average length l more than 1 mm and a diameter Ø not more than 200 ?m, in ultra high performance concrete for improving the concrete fire resistance, the amount of organic fibers being such that their volume ranges between 0.1 and 3% of the concrete volume after setting and the concrete having a compressive strength at 28 days of at least 120 Mpa, a bending strength of at least 20 Mpa, and a spread value in non-hardened state of at least 150 mm, the values being for a concrete preserved at 20° C., the concrete consisting of a particularly hardened cement matrix wherein metal fibres are dispersed.