Evonik Operations Gmbh

Florian Düllmann

Markus Hallack

Berend-Jan De Gans

Wilfried Knott

Horst Dudzik

Philippe Favresse

Sascha Herrwerth

Mona Seyfried

A method using silicon dioxide improves the cathodic anticorrosion effect of ground coats, preferably of a zinc primer, based on epoxy-functional polymers and at least one metal particle.

Use of silicon dioxide for improving the cathodic anticorrosion effect of ground coats

Curable condensation compounds are obtainable by a reaction of non-end-equilibrated acetoxy group-bearing siloxanes with at least one alkoxy-functional polysiloxane, in the presence of a catalyst.

Curable condensation compounds based on alkoxy-functional polysiloxanes

Curable condensation compounds are useful, obtainable by the reaction of end-equilibrated acetoxy group-bearing siloxanes with at least one alkoxy-functional polysiloxane, in the presence of a catalyst.

A curing agent mixture is for coatings that cure at room temperature. The curing agent mixture can include (A) 10-60% by weight, preferably 20-60% by weight, more preferably 30-50% by weight, of a polysiloxane, (B) 40-90% by weight, preferably 40-80% by weight, more preferably 40-70% by weight, of an amino-functional alkoxysilane and (C) 1-10% by weight, preferably 2-7% by weight, more preferably 3-5% by weight, of a guanidine compound. The stated amounts of components (A), (B), and (C) add up to 100% by weight and are based on the curing agent mixture.

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Hagen, Germany

Florian Düllmann