Deutsche Gold- Und Silber-scheideanstalt Vormals Roessler

Heinz Haschke

Gerhard Morlock

Horst Kruger

Gerhard Hebbel

Helmut Knorre

Gerhard Pohl

Peter Kuzel

Horst Krueger

Karlheinz Janzon

Rudolf Muller

Erich Bader

A process for improving the processability of a coating composition for paper and paper substitutes in which the composition contains at least one undissolved finely divided inorganic substance, organic substance, or mixture of such substances in a system comprised mainly of water, wherein the process comprises mixing into said system about 0.05 - 5.0 percent by weight of at least one dispersing agent consisting essentially of a polymer derived from specified units containing carboxyl, carboxylate, carbonyl and/or hydroxyl groups. A coating composition is provided.

Process for improving coating compositions for paper and paper

Process for dispersing solid, organic or inorganic colorant particles or mixtures thereof in a system comprised mainly of water by mixing into the aqueous system about 0.05 to 10% by weight of at least one dispersing agent comprising a polymer derived from specified units containing carboxyl, carboxylate, carbonyl and/or hydroxyl groups. A dispersing agent and an aqueous dispersion are provided. The process is particularly useful for dispersing pigments in aqueous systems.

Process for dispersing undissolved solid, organic or inorganic colorant

A process for decreasing the hygroscopicity of a polycarboxylate, said process comprising preparing a melt of a composition having a melting point of about 40.degree. - 120.degree. C, said composition giving an acid or neutral pH in an aqueous solution or suspension, said composition being less hygroscopic than said polycarboxylate, said composition capable of being free flowing under equilibrium conditions at about 30.degree. C and in an air atmosphere of at least about 40% relative humidity; heating said melt in a mixer to a temperature of up to about 140.degree. C; gradually adding said polycarboxylate as a powder to said melt while mixing said melt; wherein said composition comprises at least about 3 and at most about 40% by weight of the mixture resulting after all polycarboxylate has been added to said melt.

Process for decreasing the hygroscopicity of polycarboxylates

A non-foaming iodophor having a high content of active iodine comprises the product formed by mixing while heating at about 50.degree.-120.degree.C for about 0.75-15 hours a reaction mixture of:

Iodophors and a process for their preparation

Alkali percarbonates are prepared from aqueous alkali carbonate and hydrogen peroxide solution in the presence of polymeric carboxylates, especially those that contain in addition to carboxylate or carboxylic groups hydroxyl groups and if desired carbonyl groups and which have an average degree of polymerization of 5 to 5000.

Process for the production of alkali percarbonates

Process for improving the water wettability of natural or synthetic zeolites, said process comprising thoroughly mixing at least one natural zeolite, synthetic zeolite or mixture of natural and synthetic zeolites with an aqueous solution of a treating agent selected from the group consisting of at least one polyelectrolytic polycarboxylic acid, at least one completely or partially neutralized polycarboxylate, or at least one mixture of said polycarboxylic acid and polycarboxylates; wherein said treating agent has at least about 40 basic mole percent carboxyl or carboxylate groups and a mean degree of polymerization (numerical mean) between about 3 and about 5000; said mixing conducted at about 0.degree. to about 100.degree.C for at least about 5 minutes; said aqueous solution employed in a concentration between about 2 and about 800 g polycarboxylic acid or polycarboxylate per liter and in such quantity that it comprises about 0.01 to about 10 parts by weight, related to one part by weight of zeolite, of the polycarboxylic acid or polycarboxylate.

Process for improving the wettability of natural or synthetic zeolites

A process for precipitating heavy metal ion-polycarboxylate complexes from solution, said process comprising adding to a solution containing at least one of said complexes an aqueous solution of a water soluble aluminum salt, the anion of which does not form any water soluble complexes with said heavy metal ions to be precipitated or optionally such anion-heavy metal complexes having a stability constant, expressed as their decadic logarithm, of less than 2; wherein 0.9 to 1.8 moles of aluminum ions are employed per equivalent of polycarboxylate; and adjusting the pH of the resulting reaction mixture to about 6.5 to about 9.0 with an alkali metal carbonate.

Process for the precipitation of heavy metal ion-polycarboxylate

Process of manufacturing bead-shaped polymers from acrylic acid by the polymerization of monomeric acrylic acid under slow addition of the monomer to a powerfully stirred, boiling hydrophobic reaction medium and in the presence of a free radical catalyst as well as polymerization regulator and/or cross-linking agents which comprises carrying out the polymerization in the presence of a polymerization inhibitor and/or polymerization retarder.

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Grossauheim, Germany

Heinz Haschke