Process of coating calcium sulfate dihydrate detergent filler particles
AssigneeLever Brothers Company
InventorVincent Lamberti
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Abstract
Sodium sulfate, the compound commonly used as a filler in detergent compositions, is in short supply, and a suitable substitute for use in detergent compositions is calcium sulfate dihydrate coated with a substantially water-insoluble calcium salt selected from the group consisting of calcium carbonate, calcium silicate, calcium sulfite, calcium orthophosphate, hydroxyapatite and a calcium salt of an alkanoic acid having about 12 to about 22 carbon atoms.
Claims6
A process for coating calcium sulfate dihydrate particles with a substantially water-insoluble calcium compound comprising (i) dispersing 10% to 75% by weight, based on the total combined weight of the insoluble calcium compound and calcium sulfate dihydrate, of particles of calcium sulfate dihydrate in an aqueous solution of a compound capable of supplying anions which form substantially water-insoluble salts, said compound being selected from the group consisting of water-soluble carbonates, silicates, sulfites, and orthophosphates, (ii) agitating said aqueous solution until said substantially insoluble calcium salt forms as a coating on and interspersed with said particles of calcium sulfate dihydrate, and (iii) separating said coated particles from said solution.
Dependencies are inferred from the claim text.