Wacker-chemie Gmbh

Maximilian Kerbl

Richard Goetze

Robert Singer

Karl Maier

Aqueous coating of copy paper based on a porous inorganic matrix, an elastifying organic polymer and the color paste included in the pores. The inorganic matrix comprises a Zr.sup.4+ polycondensate or Zr/Al mixed oxide gel, which is preferably elastified by addition of alkali-soluble polyacrylates or poly(vinyl acetates) or water-soluble poly(vinyl alcohols) and contains the color paste included in the pores. For production, an aqueous solution or dispersion of the polymer is initially introduced, adjusted to a pH of from 8 to 9 by adding ammonia, and the color paste and an aqueous solution of the Zr compound are subsequently admixed. The coating composition is applied to a backing material and dried in a known manner.

Aqueous coating for copy paper, and a process for the production thereof

An aqueous primer based on alkali-soluble acrylic resins and siliconates, especially suitable for strongly alkaline substrates, for example, asbestos cement articles, is provided. The primer is characterized by stability to storage and good compatibility with the substrate and with customary coating agents, and it brings about good water repellence, good stabilization of the substrate and a good binding between the substrate and the final coating.

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Emmerting, Germany

Maximilian Kerbl