Abstract: The invention relates to a new diblock copolymer including units derived from styrene and units derived from acrylic acid. It comprises a block containing the units derived from styrene, and a block containing the units derived from acrylic acid and units derived from an alkyl acrylate. The invention also relates to a method for preparing the copolymer.

Abstract: Controlled geometry particles of thermoplastic polymers are prepared from compositions containing the thermoplastic polymer and two additives, in the molten state, by cooling the molten composition and disintegrating the resulting dispersion of thermoplastic polymer; powders obtained therefrom advantageously have mean particle diameters ranging from 0.1 to 800 ?m and are useful additives in, e.g., paints and coatings.

Abstract: Difluoroethanol is produced by hydrogenation, in the presence of an effective amount of a catalyst containing at least one element of Group VIII of the Periodic Table deposited onto a solid, acidic mineral support, of an acetyl halide having the following formula (I), in which formula X is a halogen atom other than a fluorine atom:

Abstract: A process for surface treatment of a plastic is provided. The process includes applying to at least one surface of the plastic a composition with reactive functional groups which can be polymerized and/or crosslinked by irradiation. The process can be used to form a coating such as an ink, a non-stick coating, an adhesive coating or a varnish.

Abstract: Silicone material crosslinkable into silicone elastomer by polyaddition reactions is described. A material is provided offering a compromise between the following characteristics: fluidity (in non-crosslinked state), hydrophilicity (in non-crosslinked or crossliked state) and high mechanical properties (in crosslinked state). The following materials are added to crosslinkable silicone material: (i) a reinforcing siliceous filler in the form of a suspension obtained by subjecting the filler to a treatment in two stages by an agent providing compatibility and by operating in the presence of a polyorganosiloxane with Si-alkenyl functions; and (ii) one or more non-ionic, ionic or amphoteric surfactants. Said silicone material is particularly useful for impressions, for example dental impressions and for making pads used in pad printing techniques.