Degussa Aktiengesellschaft

Wolfgang Leonhardt

Gunter Prescher

Manfred Diehl

Manfred Dankowski

Thomas Lieser

Maurizio Ragnetti

Rainer Kohlen

Karl Meier

Gerhard Morlock

Heinz Esch

Roland Bergmann

Alexander Ruhs

Detlef Arnoldi

Lothar Kaiser

Hans U Suess

Werner Nagel

Michael Scheibe

Holger Glaum

Marian Chjonowski

Kurt Schmidt

Dietmar Tr&auml;umer

Beata-Maria Lortz

A process is provided for the safe storage of sodium percarbonate in a bulk container that is substantially closed to the ambient atmosphere. A temperature is measured at at least one position inside the sodium percarbonate stored in bulk and, with an increase in temperature within the range of 0.5 to 10&deg; C. per day, in particular 1 to 5&deg; C. per day, dry air is passed periodically or continuously through the bulk material until the increase in temperature has fallen to a value of less than 1&deg; C. per day in particular less than 0.5&deg; C. per day.

Process for the safe storage of sodium percarbonate in bulk containers

Problems encountered when discharging bulk containers using a blow-through rotary valve can be avoided by the discharge device, according to the invention, in which a vent connection of the rotary valve is in connection with the internal chamber of the container through a filter hose open on both ends.

Discharge device for bulk containers for particulate bulk materials and

A detergent composition with improved dirt-suspending power, method for its production and use of a suitable polycarboxylate for this purpose. The novel detergent contains, in addition to the customary components such as surfactant, calcium-binding silicate, etc., at least 1% by weight of a polycarboxylate with the schematic structure (X, Y, Z) in which X stands for ##STR1## Y for ##STR2## and Z for

Detergent composition and method of use with surfactant, silicate, and

Aqueous suspensions of a silicate capable of binding calcium ions, containing, based on the total weight of the suspension,

Aqueous stable suspension of water-insoluble silicates capable of

A precipitated silica paste is produced by dispersing precipitated silica in silicon oil. During the hydrophobing of precipitated silicas, the precipitated silica paste is added as a hydrophobing agent in the suspension phase. The product is spray-dried, tempered and ground.

Precipitated silica paste

A process is disclosed for bleaching wood pulp, cellulose or used paper by treatment the fibre material to be bleached before the bleaching steps with a natural or synthetic zeolite or a layer lattice silicate and an easily decomposable organic complex forming agent, e.g. citric acid.

Process for increasing pulp brightness with zeolites and easily

The detergent builder consists of a water-insoluble silicate capable of binding calcium ions as well as of a mixture of two acrylic acid polymerizates which exhibit different viscosity numbers.

Phosphate-free detergent builders

Aqueous bleaching agent suspensions based on a water-soluble peroxycarboxylic acid suspended in a carrier liquid in the presence of an organic thickening agent and of an acidifying agent exhibit an improved storage resistance over known suspensions with this base. This is achieved by means of pourable to pasty bleaching agent suspensions which contain a xanthan polysaccharide or agar polysaccharide as thickening agent and, in addition, a hydrate-forming neutral salt which desensitizes peroxycarboxylic acids. Preferred suspensions exhibit a pH of 2-5 and contain 10-30% by wt. diperoxydodecanedioic acid, 5-20% by wt. sodium sulfate and 0.1-1.0% by wt. xanthan. The use of non-dried, hydrophilized and optionally in situ desensitized peroxycarboxylic acids is especially preferred. The bleaching agent suspensions are prepared by homogeneously suspending the peroxycarboxylic acid in the thickened carrier liquid. The storage-resistant bleaching agent suspensions are used as laundry bleaching agents and for preparing cleaning agents and disinfection agents.

Aqueous bleaching agent suspensions containing peroxycarboxylic acid,

Aqueous bleaching agent suspensions based on a water-insoluble peroxycarboxylic acid suspended in a carrier liquid in the presence of a colloidal silicic acid and of an acidifying agent which exhibit, in comparision to known suspensions with this base, an improved storage resistance and are more economical to prepare. This result is achieved by means of pourable-to-pasty bleaching agent suspensions which contain 0.1 to 9% by weight silicic acid in relation to the suspension and contain a hydrate-forming neutral salt which desensitizes peroxycarboxylilc acids, in an amount of 10 to 400% by weight, calculated hydrate-free and in relation to peroxycarboxylic acid added. Preferred bleaching agent suspensions contain 10-30% by weight diperoxydodecanedioic acid, 5-20% by weight sodium sulfate and 2 to 6% by weight pyrogenic silicic acid, each in relation to the suspension. The use of non-dried, hydrophilized and optionally in situ-desensitized peroxycarboxylic acids is especially preferred. The preparation of the bleaching agents is performed by homogeneously suspending the peroxycarboxylic acid in the thickened carrier liquid. The storage-resistant bleaching agent suspensions find application as laundry bleaching agents and for the preparation of cleaning and disinfecting agents.

Growing community of inventors

Frankfurt-am-Main, Germany

Wolfgang Leonhardt