Asbestos dispersions
AssigneeTBA Industrial Products Limited
InventorPhilip H. Taylor
Life of this patent
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Abstract
Asbestos fibre is dispersed in an aqueous medium essentially comprised of water, soap and from 25 to a 100 percent molar excess of fatty acid, said excess being calculated on the amount of fatty acid combined in the soap, to form a colloidal dispersion.
Claims8
A dispersion of asbestos fiber in an aqueous medium consisting essentially of water, soap and from 25 to 100 percent molar excess of free fatty acid, said excess being calculated on the amount of fatty acid combined in the soap, said fatty acid having a chain length of at least 12 carbon atoms.
In the process of making a dispersion of asbestos fibre suitable for passage through a nozzle in order to form a strand or filament, which process comprises opening asbestos fibre, in an aqueous medium containing a sufficient amount of fatty acid soap as to effect a dispersion of the asbestos fibers in the aqueous medium, by mixing such aqueous medium containing the asbestos fibre for a time sufficient to provide the dispersion, the improvement which comprises effecting said mixing, for a time at least sufficient to produce a smooth and homogeneous dispersion, in the presence in said mixture of from 25 to 100 percent molar excess of a free fatty acid having a chain length of at least 12 carbon atoms and which does not react with or precipitate said soap.
A dispersion of asbestos fibre in an aqueous medium characterized by its smoothness and homogeneity and its ability to pass through a nozzle in order to form a strand or filament, which aqueous medium consists essentially of water, a fatty acid soap in amount sufficient to effect a dispersion of the asbestos fibres in the aqueous medium and from 25 to 100 percent molar excess of a free fatty acid having a chain length of at least 12 carbon atoms and which does not react with or precipitate said soap.
The method of making a smooth and homogeneous dispersion of asbestos fiber in water for the production of coherent bodies such as strands and filaments, which comprises the steps of:
- (a) providing a fatty acid soap in which the fatty acid has a chain length of at least 12 carbon atoms;
- (b) providing free fatty acid having a chain length of at least 12 carbon atoms and which does not react with or precipitate the soap of step (a);
- and
- (c) dispersing an amount of asbestos fiber of from about 0.5 to about 10% by weight in water in the presence of (i) a sufficient amount of the soap of step (a) to form a dispersion of the asbestos fiber and (ii) a weight amount of the free fatty acid of step (b) which is equal to from 25 to 100 percent the weight amount of the fatty acid content of the soap of step (a).
Dependencies are inferred from the claim text.