C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 31/04 (2006.01) C01B 31/00 (2006.01) C09C 1/46 (2006.01) C09K 21/02 (2006.01)
Patent
CA 2452228
A method is described for controlling the expansion properties of thermally expandable sulfuric acid-graphite particles, wherein the sulfuric acid- graphite particles, produced by the reaction of graphite particles with sulfuric acid in the presence of an oxidizing agent, are washed with are aqueous washing liquid, containing the compounds affecting the expansion properties, to a pH ranging from 2 to 8 and preferably from 3 to 7, measured in the washing liquid separated from the washed sulfuric acid-graphite particles, and then dried. Furthermore, the use of the thermally expandable sulfuric acid-graphite particles, obtainable by the method of claims 1 to 9, as intumescing tire-retarding additives for producing fire- retarding compositions especially far the fire-preventing sealing of through holes, wall bushings and other openings in walls, floors and/or ceilings of buildings, is described.
Reinheimer Arne
Wenzel Antje
Gierczak Eugene J. A.
Hilti - Aktiengesellschaft
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