Patent ID: 8232323
Filing Date: 2012-07-31
Classification: B01J,C01G,C01P,C09C

Abstract:
1. A process for the manufacture of a colloid consisting of iron oxide particles dispersed in a carrier fluid by means of a mixture of mono- and polycarboxylic acids, said process comprising the following steps: a) mixing a first colloid consisting of iron oxide particles dispersed in a carrier fluid, dispersing means within the first colloid being one or more monocarboxylic acids with one or more additional carboxylic acids consisting of one or more polycarboxylic acid compounds (or precursors thereof) to form the desired colloid of iron oxide; and b) heating the admixture of the first colloid and the additional carboxylic acids to a temperature of between about 100° C. and about 180° C. for a period of between about 1 and 10 hours under stirring whereby a reaction is conducted in the carrier fluid as solvent; and wherein water is additionally present to effect in situ hydrolysis of any polycarboxylic acid precursor when any such precursor is used.