Claims
- 1. 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.
- 2. A process in accordance with claim 1 wherein said separated coated particles are subjected to a drying step to form a free-flowing particulate detergent filler.
- 3. A process according to claim 1 wherein the compound capable of supplying anions that form substantially water-insoluble calcium salts is a water-soluble carbonate.
- 4. A process according to claim 3 wherein the compound is sodium carbonate.
- 5. A process according to claim 1 wherein the compound capable of supplying anions that form substantially water-insoluble calcium salts is a water-soluble silicate.
- 6. A process according to claim 5 wherein said water-soluble silicate is sodium silicate.
Parent Case Info
This is a division of application Ser. No. 506,160, filed Sept. 16, 1974 now U.S. Pat. No. 3,954,649.
US Referenced Citations (3)
Foreign Referenced Citations (1)
Number |
Date |
Country |
936,057 |
Sep 1963 |
UK |
Divisions (1)
|
Number |
Date |
Country |
Parent |
506160 |
Sep 1974 |
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