Rhone-poulenc Chimie

Rhone-poulenc Industries

Gilbert Schorsch

Pierre-Michel Peccoux

Dominique Charmot

Bertrand Latourrette

Pierre Canard

Pierre-Michael Peccoux

Jerome Bibette

A process for the preparation of aqueous dispersions of magnetizable polymer particles with a narrow distribution from aqueous dispersions with a wide distribution. The amount of water in the aqueous dispersion with a wide distribution is adjusted so that the proportion by weight of magnetizable polymer particles is between about 1 and 40% of said dispersion. The surfactant concentration of the dispersion after the water adjustment is increased until two phases are obtained: a so-called liquid phase and a so-called solid phase. After separation of these two phases is accomplished, these steps are repeated as desired. An aqueous dispersion with a narrow size distribution is recovered.

Process for the preparation of aqueous dispersions of magnetizable

Two-package RTV organopolysiloxane compositions are prepared from storage-stable dihydroxypolydiorganosiloxane aqueous doughs that include an effective water-retaining amount of an alkali metal acrylate and/or methacrylate polymer (hydroretainer); such doughs advantageously contain from 8% to 35% by weight of water.

Two-package RTV organopolysiloxanes comprising a water-retaining polymer

Organopolysiloxane compositions curable into elastomeric state even in the absence of atmospheric moisture, notably in a confined environment, and well adopted for the production of seals, include an acyloxy crosslinking agent and a natural or synthetic hydrogel hardening agent.

Curable organopolysiloxane compositions comprising a hydrogel hardening

Organopolysiloxane compositions curable into elastomeric state even in the absence of atmospheric moisture, notably in a confined environment, and well adopted for the production of seals, include a ketiminoxy crosslinking agent and a natural or synthetic hydrogel hardening agent.

High impact strength, improved bending modulus composites are comprised of a polymeric matrix, e.g., elastomer or synthetic polymer of polypropylene or polyamide type, said matrix having highly dispersed therein a reinforcing amount of relatively small synthetic zeolitic filler particulates, e.g., of types A, 4A and Na-P, and the mean size of the elementary particles thereof advantageously closely approximating those of the secondary particles.

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Colombes, France

Gilbert Schorsch