Nabaltec Ag

Manfred Sorgalla

Alfred Reimer

Reiner Sauerwein

Ludwig Edenharter

Wolfgang Wehner

Neutral calcium-aluminum double salts of the formula (A):Ca(Zn)Al(OH)An*HO&#x2003;&#x2003;(A),where the following apply for m and n:m=0.5 to 3 and 0.5m&#x2267;n&#x3e;0; An=CO, where this may be replaced completely or partially by at least one of the following groups selected from OH, ClOand HCS(&#x2550;O)O (triflate) and o=0 to 3. The present invention further relates to their preparation, use in compositions and stabilizer systems and uses thereof.

Zinc-containing calcium-aluminium double salts

Method for the production of a finely crystalline boehmite and application of said boehmite as flame retardant in plastics. The method involves mixing aluminum monohydrate with a boehmite crystal structure in water to form an aqueous dispersion of said aluminum monohydrate in said water, and then grinding the dispersion while maintaining the dispersion in a pH range of 2 to 4 and forming boehmite seed crystals. The boehmite seed crystals can then optionally be mixed with a hydrate and a basic aqueous solution to form a dispersion which may be heated to convert at least a substantial portion of the aluminum monohydrate to boehmite.

Method for the production of a finely crystalline boehmite and application of said boehmite as flame retardant in plastics

A process is provided for preparing calcium carbonate hydroxodialuminates which have a hexagonal platelet-shaped crystal habit and are of the formula (A):CaAl(OH)An*HO&#x2003;&#x2003;(A)where m=3.5 to 4.5 and An=carbonate which may be partly replaced by perchlorate and/or trifluoromethanesulfonate (triflate) and n=0 to 6, comprising the steps of reacting calcium oxide or calcium hydroxide with optionally activated aluminum oxohydroxide or aluminum hydroxide and simultaneously or subsequently with a carbonate source consisting of carbon dioxide or alkali metal (bi)carbonate and optionally further reacting the product obtained in step (a) with perchloric acid and/or trifluoromethanesulfonic acid or optionally calcining the product obtained in step (a) at 200&#xb0; C. to 900&#xb0; C. and subsequently exchanging ions in the presence of a perchlorate and/or triflate salt, optionally in the presence of alkali metal (bi)carbonate, in water. The present invention further relates to the aluminates thus obtained in compositions and stabilizer systems and to the use thereof.

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Schwandorf, Germany

Manfred Sorgalla