Rhone-poulenc Chimie

Rhodia Chimie

The Procter Gamble Company

Rhodia Operations

Lafarge

Bouygues

Kerneos

Bouygues Travaux Publics

Evelyne Prat

Yvonick Chevallier

Laurent Frouin

Yves Bomal

Jerome Dugat

Pierre Richard

Sylvie Touzet

Stefano Scialla

Mathias Destarac

Jean-Yves Chane-Ching

Gilles Orange

Luca Sarcinelli

Chi-Thanh Vuong

Marc Francois Theophile Evers

Mouloud Behloul

Minou Nabavi

Valérie Billebaud

Olivier Anthony

Pascal Taquet

Thierry Jeannette

Jamel Mahiaoui

Pascal Casanova

Marie Pierre Labeau

Annick Julia Oscar Mertens

L&acirc;&uuml;rent Frouin

Andre Bertoncini

Jean-Luc Jaquier

Florence Deschaseaux

André Pascal Casanova

A cellular structure thermal insulation material includes by weight as compared to the material total weight:

Thermal insulation material and method for making the same

The invention relates to a treatment that can be used to remove a coating and/or stain from a construction material, such as anti-graffiti treatment. The inventive treatment uses a beta-dicarbonyl product.

Treatment enabling the removal of a coating and/or stain from a construction material

The present invention relates to a hard surface cleaning composition comprising a copolymer, wherein said copolymer comprises a zwitterionic unit A or a mixture thereof and another unit B or a mixture thereof, wherein said unit A comprises a betaine group or a mixture thereof and wherein said betaine group of said unit A is a sulphobetaine group or a mixture thereof, and wherein said unit B is derived from vinyl-pyrrolidone.

Hard surface cleaning composition

The invention concerns a novel photosensitive composition for photoresist and a system comprising a substrate and a photoresist obtained from said novel composition. The photosensitive composition for photoresist comprises a copolymer with hydrophobic blocks whereof at least one block is an hydrophobic block capable of generating a hydrophilic block and comprising at its end a group selected among dithioesters, thioesters-thiones, dithiocarbamates and xanthates, and a photoactive compound capable of generating under the effect of a radiation an active species reacting with the hydrophobic block to generate the hydrophilic block.

Photosensitive composition for photoresist manufacture

The invention concerns the use of organic fibers having a melting point lower than 300&#xb0; C., an average length l more than 1 mm and a diameter &#xd8; not more than 200 &#x3bc;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&#xb0; C., the concrete consisting of a particularly hardened cement matrix wherein metal fibres are dispersed.

Fire-resistant high performance concrete composition

Concentrated suspension of precipitation silica, processes for its preparation and uses of this suspension

This invention relates to an aqueous suspension including a mixture of at least one aqueous suspension of precipitated silica and of at least one latex, in which the aqueous suspension of precipitated silica has a solids content of between 10 and 40% by weight, has a viscosity lower than 4&times;10 Pa s at a shear of 50 s and, after centrifuging at 7500 revolutions per minute for 30 minutes, produces a supernatant containing more than 50% of the weight of the silica initially in suspension. This suspension can be employed in compositions based on an inorganic binder and in concrete compositions.

Aqueous silica suspensions and their applications in compositions based on inorganic binder

Composition which is useful for exterior coatings, comprising, for successive or simultaneous addition, an aqueous phase comprising a polyol dispersion or solution whose glass transition temperature (t ) is not more than 100&deg; C.; and an isocyanate sub-composition already emulsified or to be emulsified in the aqueous phase.

Exterior coating, composition used for such coatings and method for obtaining same

Aqueous suspension based on alkaline aluminium polysulphate, preparation method and use in the field of building materials

Aqueous suspension including a mixture of at least one aqueous suspension of precipitated silica and of at least one latex

Silicas in the form of powder and substantially spherical beads or granules are characterized by a CTAB specific surface of 140 and 240 m /g a high ultrasonic disaggregation factor, an average diameter, which is small after ultrasonic disaggregation, and optionally, a porous distribution, the porous volume formed by the pores with a diameter of 175 to 275 &angst; being less than 50% of the porous volume formed by the pores with diameters of 400 &angst; or less. The silicas may be used as reinforcing fillers for elastomers. The invention also concerns a method for preparing precipitated silica of the type comprising the reaction of an alkaline metal silicate M with an acidifying agent, resulting in a suspension of precipitated silica, and the separation and drying of said suspension, wherein precipitation is performed as follows: (i) an initial seed is formed comprising a portion of the total quantity of alkaline metal silicate M in the reaction, the silicate concentration (expressed as SiO ) in said seed being less than 20 g/l; (ii) an acidifying agent is added to the initial seed until at least 5% of the quantity of M O in the initial seed is neutralized; (iii) the acidifying agent and the remaining quantity of alkaline metal silicate M are added simultaneously so that the ratio of the quantity of added silicate (expressed as SiO ) to the quantity of silica in the initial seed (expressed as SiO ) is greater than 4 and at most 100.

Precipitated silica

A mechanically strong, vulcanized elastomeric matrix having an effective amount of a reinforcing filler material homogeneously dispersed and distributed therethrough, the reinforcing filler material comprising finely divided precipitated silica particulates and the precipitated silica particulates deriving from a powder having a CTAB specific surface ranging from 100 to 140 m,/g, a median diameter &phgr;,, after ultrasonic disintegration, less than 2.8 &mgr;m, exhibiting an ultrasonic disintegration factor F,greater than 3 ml, having a BET specific surface ranging from 100 to 200 m,/g, having a mean particle size greater than 15 &mgr;m, a packing density in the tamped state of at least 0.17, and a DOP oil uptake ranging from 150 to 400 ml/100 g.

Elastomeric matrix reinforced with precipitated silicas

Silicas in the form of powder and substantially spherical beads or granules are characterized by a CTAB specific surface of 140 and 240 m,/g a high ultrasonic disaggregation factor, an average diameter, which is small after ultrasonic disaggregation, and optionally, a porous distribution, the porous volume formed by the pores with a diameter of 175 to 275 &angst; being less than 50% of the porous volume formed by the pores with diameters of 400 &angst; or less. The silicas may be used as reinforcing fillers for elastomers. The invention also concerns a method for preparing precipitated silica of the type comprising the reaction of an alkaline metal silicate M with an acidifying agent, resulting in a suspension of precipitated silica, and the separation and drying of said suspension, wherein precipitation is performed as follows: (i) an initial seed is formed comprising a portion of the total quantity of alkaline metal silicate M in the reaction, the silicate concentration (expressed as SiO,) in said seed being less than 20 g/l; (ii) an acidifying agent is added to the initial seed until at least 5% of the quantity of M,O in the initial seed is neutralized; (iii) the acidifying agent and the remaining quantity of alkaline metal silicate M are added simultaneously so that the ratio of the quantity of added silicate (expressed as SiO,) to the quantity of silica in the initial seed (expressed as SiO,) is greater than 4 and at most 100.

The invention relates to a new process for the preparation of precipitated silica which has a good dispersibility and very satisfactory reinforcing properties. It also relates to new precipitated silicas which are in the form of powder, of substantially spherical beads or of granules, these silicas being characterized by the fact that they have a CTAB specific surface of between 90 and 250 m.sup.2 /g, a BET specific surface of between 90 and 250 m.sup.2 /g, a DOP oil uptake lower than 300 ml/100 g, a zinc content of between 1 and 5% by weight, and by the fact that the number N of stearic acid molecules consumed per nm.sup.2 of silica surface, when stearic acid is reacted with this silica in xylene for 2 hours at 120.degree. C., is at least 1. The invention also relates to the use of the said silicas as reinforcing fillers for elastomers, especially for improving their rheological properties.

Process for the precipitated silica new precipitated silicas containing

The invention relates to a new process for the preparation of precipitated silica which has a good dispersibility and very satisfactory reinforcing properties. It also relates to new precipitated silicas which are in the form of powder, of substantially spherical beads or of granules, these silicas being characterized by the fact that they have a CTAB specific surface of between 90 and 250 m.sup.2 /g, a DOP oil uptake lower than 300 ml/100 g, a pore distribution such that the pore volume consisting of the pores whose diameter is between 175 and 275 .ANG. represents less than 50% of the pore volume consisting of the pores of diameters smaller than or equal to 400 .ANG., a zinc content of between 1 and 5% by weight and by the fact that the number N of molecules of stearic acid consumed per nm.sup.2 of silica surface, when stearic acid is reacted with the said silica in xylene for 2 hours at 120.degree. C., is at least 1. The invention also relates to the use of the said silicas as reinforcing fillers for elastomers especially for improving their rheological properties.

Process for the preparation of precipitated silica, new precipitated

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Pantin, France

Evelyne Prat