Skw Trostberg Aktiengesellschaft

Josef Seeholzer

Horst Michaud

Heinrich Rock

Joachim Von Seyerl

Georg L Rieder

Hermann Raveling

Bohnslav Dobias

Josef Kuchler

Rudolf Eichinger

Hans-Georg Erben

The present invention relates to modifying agents for melamine-formaldehyde resins and highly reactive thermosetting resins which are prepared with this agent and consist of 1 mol of melamine, 1.5 to 3.5 mol of formaldehyde, 0.5 to 5% by weight of a polyhydric alcohol, based on the melamine plus formaldehyde, and 0.5 to 10% by weight of the modifying agent, based on the liquid resin. The modifying agent can be added to the melamine-formaldehyde resin as a pulverulent mixture before or during the condensation reaction or in the liquid state in the form of a condensation product prepared in a known manner. The modifying agent consists of 10 to 75% by weight of dicyandiamide, 5 to 70% by weight of cold water-soluble starch (soluble between about 18.degree. and about 25.degree. C.) and 20 to 85% by weight of a guanamine. The highly reactive resins modified in this way are preferably used for coating chipboard and hardboard by a short cycle process.

Modifying agents for thermosetting resins and thermosetting resins

The present invention provides a flocculation and/or fixing agent for paper sizing in the weakly acidic to weakly alkaline pH range, wherein it contains or consists to a preponderant amount of a mixture and/or a co-condensation product of the components cationic dicyandiamide resin and polyaluminium hydroxy compound. The present invention also provides processes for the production of this agent.

Flocculation and/or fixing agent for paper sizing

The present invention provides a process for the separation of minerals by flotation in the presence of activators and suppressors. Activators are cation-active condensation products and suppressors are anion-active products of aminoplast formers, formaldehyde and amines, ammonium salts, acids or a sulphite, in combination with either an anion-active or cation-active tensides.

Process for the separation of minerals by flotation

The present invention provides a process for sizing in the production of paper, cardboard, paperboard and other cellulose-containing materials with and without filling materials and/or pigments by natural or synthetic sizing agents under neutral to weakly basic pH conditions without the use of aluminum salts, wherein sizing is carried out with a combination of natural or synthetic sizing agents with a cationic dicyandiamide resin.

Process for sizing in the production of paper, cardboard, paperboard and

The present invention provides a stabilized fertilizer solution, especially a nitrogen fertilizer solution, with a content of dicyandiamide as nitrification inhibitor, wherein, for retarding dicyandiamide crystallization, the solution contains at least one water-soluble organic polymeric compound as stabilizer.

Stabilized fertilizer solutions

Odorless prilled urea-dicyandiamide fertilizers are produced by melting a mixture of urea and dicyandiamide containing 5% to 35% by weight of dicyandiamide nitrogen, based on the total nitrogen of the mixture, at a temperature below 135.degree. C. and then prilling the molten material to form a free-flowing globular product.

Process for the production of odorless prilled urea-dicyandiamide

Aqueous solutions of commonly used fertilizers which also contain dicyandiamide, in an amount to provide at least 10% by weight of dicyandiamide nitrogen, are effective nitrification inhibitors and have an improved capacity to dissolve micronutrients to form solutions of improved micronutrient stability.

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Trostberg, Germany

Josef Seeholzer