Basf Aktiengesellschaft

Dietrich Hoffmann

Karin H Beck

Bernhard Schuler

Walter Kurtz

Horst Belde

Erwin Czech

Wolfgang Sliwka

Helmut Bellaire

Ulrike Schlosser

Heinrich Follmann

Doug R Campbell

Aqueous dye preparations useful for producing inks for the inkjet process or writing inks or for producing aqueous alcoholic coating or printing colors comprise, based on the weight of the preparation, from 0.1 to 15% by weight of a dye quantity comprising from 90 to 100% by weight of the dye of the formula I ##STR1## where Kat.sup..sym. is the equivalent of a metal or ammonium ion, from 1 to 40% by weight of carbon black and from 0.1 to 15% by weight of polyethylene glycol.

Aqueous dye preparations

Recording materials which contain one or more optionally polymer-enrobed dye precursors, one or more optionally polymer-enrobed developers and one or more polymer-enrobed sensitizers are described.

Heat sensitive recording materials with polymer enrobed sensitizer

Color former preparations

Spherical, hard mono- or oligodisperse particles of diameter from 0.1 to 100 .mu.m are prepared by condensation of partially etherified melamine-formaldehyde precondensates which form a clear solution in water in every ratio, in an aqueous solution of a water-soluble polymer which has strongly acid groups and a K value of from 100 to 160, at pH 3 to 6 and at 20.degree. to 100.degree. C., and condensation of the resulting cloudy solution is continued until the precondensate has been consumed, resulting in a dispersion of the particles. The dispersion is neutralized. The particles can be used in the form of the aqueous dispersion or after isolation from the dispersion. The particles are spherical, hard and non-swellable and can be used, for example, as sizes for plastics, polishes, delustrants, extruders and/or as pigment. The process makes it possible to produce particles of predetermined size and size distribution.

Preparation of spherical, hard mono- or oligodisperse particles of

Wax compositions and carbon paper compositions based on waxes, oils and colorants contain some or all of the oil in encapsulated form.

Carbon papers containing carbon paper compositions

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Roedersheim-Gronau, Germany

Dietrich Hoffmann