Akzo N.v.

Hans-Georg Schaffer

Gunter Poppel

Horst Schurmann

Axel Vogts

Fuel briquettes containing binding agents and additives, obtained by briquetting 80-99% by weight of an essentially solid fuel, 0.1-19% by weight of a natural or synthetic binding agent and 0.1-10% of a cationic polyurethane obtained by a monomeric aliphatic dihydroxy compound, which has at one of its two atoms bonding the two dihydroxy groups an aliphatic residue with minimum 10 carbon atoms, being reacted with a polyisocyanate and an aliphatic monomeric diol containing tertiary nitrogen which in the obtaining of the cationic polyurethane is rearranged into its ammonium phase, or obtained by reacting the monomeric aliphatic dihydroxy compound with a polyisocyanate and an appropriate aliphatic monomeric diol in which the nitrogen is present already in its ammonium state. The briquets are obtained by commingling and forming into briquets, in a known manner, the mentioned components. Preferred embodiments include use of charcoal or brown coal as solid fuel; use of brown coal containing 5-10% of a natural constituent as binding agent; the natural constituent being bitumen; colding mixing the comminuted fuel, binding agent and cationic polyurethane; and use of polyvinyl alcohol as synthetic binding agent, particularly having a viscosity from 0.003 Pas to 0.07 Pas, and particularly with a weight ratio of cationic polyurethane to polyvinyl alcohol from 1:3 to 3:1.

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Aachen, Germany

Hans-Georg Schaffer