Evonik Degussa Gmbh

Degussa Gmbh

Dieter Kuhn

Mario Scholz

Karl Meier

Christian Panz

Markus Ruf

Michael Kempf

Helga Obladen

Rene Allerdisse

Uwe Schachtely

Thomas Welker

Ulrich Boes

Werner Michel

Henri Sautel

Gerold Schmidt

Andrea Tietze

Uwe Kinzlinger

Guido Scharf

Aziz El Moussaoui

Joerg Roeder

Didier Lagneaux

Frank Menzel

René Allerdisse

A precipitated silica having an SiOHabsorbance ratio of greater than or equal to 1.5, a silanol group density of 1 to 3.0 SiOH/nm, a modified tapped density of 1 to 50 g/l, and a pH of 3-5, when measured as a aqueous suspension of 5.00 g of the precipitated silica in 100 ml. of deionized water allows preparation of storage-stable RTV-1 silicone rubber formulations without stabilizer. A process for preparing the precipitated silica and its use in thickening sealants is provided.

Precipitated silicas for storage-stable RTV-1 silicone rubber formulations without stabilizer

Thermoplastic elastomer mixture which comprises at least one thermoplastic elastomer TPE, with the exception of a thermoplastic polyurethane TPU, and at least one filler from the group of precipitated silica, or precipitated silicate or carbon black. The thermoplastic elastomer mixtures are produced by, in a first step, mixing at least one filler selected from the group of precipitated silica, or precipitated silicate or carbon black, and at least one thermoplastic to give a masterbatch and, in a second step, mixing the masterbatch with at least one thermoplastic elastomer, with the exception of a thermoplastic polyurethane TPU. The thermoplastic elastomer mixture can be used in injection-molded items.

Thermoplastic elastomer mixtures

Hydrophilic precipitated silicas which combine a particularly low initial moisture content with low moisture absorption over time, a low tapped density and a low silanol group density, have the following physicochemical parameters: equilibrium moisture content (at 70% relative humidity/20&#xb0; C.) of 0.5%-5.0% by weight, based on the weight of the hydrophilic precipitated silica, BET surface area of 50-250 m/g, CTAB surface area of 50-250 m/g, and DBP (anhydrous) of 200-350 g/100 g.

Hydrophilic silica for sealants

Thermoplastic elastomer, which comprises a fumed, hydrophilic or hydrophobic silica, which has been structurally modified and also a process for the improvement of the mechanical properties of thermoplastic elastomers. The thermoplastic elastomers are produced by preparing a masterbatch from the components (e.g. thermoplastic resin component and fumed silica) and compounding this with further thermoplastic elastomers.

Thermoplastic elastomers

Precipitated silicas having an SiOHabsorbance ratio of greater than or equal to 1, may be used as reinforcers and thickeners for sealants.

Precipitated silicas having special surface properties

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Rodenbach, Germany

Dieter Kuhn