Council of Scientific and Industrial Research

Rhodia Chimie

Ecole Superieure De Physique Et De Chimie Industrielles De La Ville De Paris

Cnrs

Christophe Chassenieux

Julien Hernandez

Lionel Ventelon

Patrick Perrin

Manohar Virupax Badiger

Françoise Lafuma

Aarti Subhash Shedge

Dominque Hourdet

Prakash Purushot Wadgaonkar

Christelle Perreur

Ashish Kishori Lele

The invention concerns a method for preparing anisotropic silica aggregates comprising the following steps: a) contacting at least one polymer with non-aggregated silica particles and/or highly dispersed in an aqueous medium, with a ratio R, polymer weight to silica particle surface, ranging between 0.03 and 2 mg/m; 2; and whereof the electrostatic value of the silica particle surface is not less than the value of the charge of the silica particle surface measured in an aqueous phase without added salts at a pH not less than 7; b) consolidating the aggregates obtained at step a) either by heat treatment, or by precipitation of a mineral compound. The invention also concerns a silica aggregate comprising a chaining of elementary particles whereof the number of particles ranges between 5 and 15, whereof 80% of elementary particles are in contact with not more than 2 particles and whereof the greatest distance measurable between 2 points of the aggregate is not more than 5 times the average size of one elementary particle.

Method for preparing anisotropic silica aggregates

The present invention relates to the development of hydrophobically modified polymers [HMPs], which have emerged as promising materials in diverse fields such as paints, cosmetics, oils, food and textiles. They are used as thickeners in these applications. In our study, the hydrophobic modification on PAA was performed using hydrophobic compounds obtained from naturally occurring materials such as Cashew Nut Shell Liquid, [CNSL]. The DCCI coupling method was chosen for the hydrophobic modification of PAA. A series of hydrophobically modified PAAs were synthesized with different degrees of hydrophobic contents and were characterized by solution rheology.

Hydrophobically modified poly(acrylic acid) [PAA] and process of preparation thereof

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Paris, France

Christophe Chassenieux