Inorganic fibers
AssigneeSuddeutsche Kalkstickstoff-Werke Aktiengesellschaft
InventorsAlois Aignesberger, Walter Lukas, Ekkehard Weinberg
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Abstract
The invention provides inorganic fibers based on calcium sulfate dihydrate or calcium sulfate aluminate hydrate (or their dehydration products), wherein the ratio of average length to diameter of the fibers is more than 100:1 and the length of the fibers is at least 0.2 mm; preferably the ratio of average length to diameter is 300-800:1, and the length is 0.5-6 mm.
Claims8
Method for the preparation of calcium sulfate dihydrate fibers or their dehydration products having a ratio of average length to diameter of more than 100:1 and a length of at least 0.2 mm, which method comprises
- reacting a dilute aqueous solution of at least one calcium salt at elevated temperature with a dilute aqueous solution of the stoichiometric amount of a water-soluble sulfate at pH values between 8 and 13,
- the reaction mixture obtained to stand until the desired fiber length is achieved, and
- separating the fibers formed from the solution after achieving the desired length.
Dependencies are inferred from the claim text.