Rhone-poulenc Chimie

Rhodia Operations

Rhodia Chimie

Solvay Specialty Polymers Usa, LLC

Pierre-Yves Lahary

Yvonick Chevallier

Jean Coquard

Serge Roy

Daniel Brun

Gérard Mignani

Adrien Dromard

Joel Flores

Jean-Francois Thierry

Cécile Corriol

Remi Valero

Céline Marcandelli

Chloé Epinat

Anthony Bocahut

Described herein are thermoplastic composites including a polymer matrix, having a at least one semi-crystalline polyphthalamide ('PPA') polymer, and at least one continuous reinforcing fiber. It was surprisingly discovered that incorporation of semi-crystalline PPA polymers, having a selected melt profile, into the polymer matrix provided for crack-free thermoplastic composites. Based at least in part on the semi-crystalline structure of PPA polymers, the thermoplastic composite can have improved tensile strength, chemical resistance and thermal stability, relative to composites incorporating an amorphous PPA polymer. The composites can be formed using melt impregnation techniques, well known in the art. The composites can be desirably used in a wide range of application settings including, but not limited to automotive, aerospace, automotive and oil and gas and mobile electronic device applications.

Thermoplastic composites and corresponding fabrication methods and articles

Precipitated silica specifically useful in the paper industry and in particular in paper-coating applications for inject printing, is characterized by an uptake of DOP oil lower than 260 ml/100 g, a pore volume (V) of greater than 0.8 ml/g formed by pores having a diameter of less than 25 nm, a CTAB specific surface area of greater than 280 m/g.

Precipitated silica and paper industry/other applications thereof

A process is described for manufacturing articles by selective fusion of polymer powder layers, especially the rapid prototyping by solid-phase laser sintering of a powder based on a copolyamide of type 6 having a low enthalpy of cold crystallization. Further described, are the articles obtained by such a process.

Production of an article by selective fusion of polymer powder layers

The invention relates to a method for reducing the COcontent of a gas by contacting the gaseous effluent to be treated with an absorbent that contains a COtrapping agent in the impregnated state on a substrate made of a solid composite material (M) containing a polymer (P) and a compound (C) selected from mineral oxides, silico-aluminates, and activated carbon, wherein said material (M) has an average particle size (D50) higher than or equal to 100 &#x3bc;m, and a pore space (Vd1) defined by pores having a diameter of between 3.6 and 1000 nm and which is at least 0.2 cm/g. The invention also relates to specific absorbents used in said method.

Method for treating a gas to reduce the carbon dioxide content thereof

The invention concerns the use, as thickening or texturing agent in toothpaste compositions, of a highly dispersible precipitated silica having a pH of 3.5 to 9, a DOP oil absorption higher than 200 ml/g, a CTAB specific surface area from 70 to 250 m2, a median diameter of at least 20 &#x3bc;m determined by ultrasound-free laser diffraction, a residual anion rate, expressed in sodium sulphate, less than 5 wt. %.

Use of a high structure and dispersible precipitated silica as a thickening or texturing agent in toothpaste compositions

L-aspartic acid is improvedly prepared in high yields by treating ammonium aspartate, advantageously in aqueous reaction medium, with an effective, aspartic acid-precipitating amount of fumaric acid.

Preparation of L-aspartic acid

Semi-crystalline, semi-aromatic copolyamides derived from terephthalic acid and mixtures comprising an alkylpentamethylene diamine and hexamethylenediamine by a process including thermal polycondensation in a closed system of the autoclave type.

Semi-crystalline, semi-aromatic copolyamides

Maleamic acid (aminomaleic acid) is improvedly prepared by reacting gaseous ammonia with molten maleic anhydride under reactant contact conditions of high surface area, for example reacting said gaseous NH.sub.3 with a thin film of said molten maleic anhydride or with said molten maleic anhydride in a state of vigorous agitation.

Preparation of maleamic acid

Amorphous or semicrystalline semi-aromatic copolyamides are prepared, with significantly reduced loss of amino reactant, by polycondensing an acidic monomer which includes at least one aromatic dicarboxylic acid having from 8 to 18 carbon atoms with an amino comonomer consisting essentially of an alkylpentamethylenediamine, or salt thereof, wherein said polycondensation is carried out in a closed reaction zone.

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Lyons, France

Pierre-Yves Lahary