Moisturized compositions of hydrate-forming phosphates and methods for preparation thereof
OwnerLouis A. Highfillinventor
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Abstract
A composition of matter in particulate, crystalline form. The composition comprises a hydrate-forming phosphate selected from the group consisting of sodium tripolyphosphate, sodium pyrophosphate and trisodium phosphate, between about 0.1% by weight and about 23% by weight added water in the form of water of hydration said water containing in solution sufficient surfactant to provide the composition from about 0.20 ppm and about 125 ppm of a surfactant. Methods for preparing such compositions are also disclosed.
Claims24
A composition of matter in particulate, crystalline form, free-flowing during storage and prolonged exposure to ordinary temperature and humidity conditions, having an increased rate of solution comprising a hydrate-forming phosphate selected from the group consisting of sodium pyrophosphate and trisodium phosphate and added water from about 0.1% by weight up to full hydration in the form of water of hydration, said water containing in solution sufficient surfactant to provide the composition with from about 0.2 ppm to about 125 ppm surfactant.
A composition of matter in particulate, crystalline form, comprising a hydrate forming phosphate, selected from the group consisting of sodium, pyrophosphate and trisodium phosphate, between about 0.1% by weight and about 4% by weight water in the form of water of hydration and between about 0.2 ppm and about 20 ppm of a surfactant.
A method for the preparation of a particulate, crystalline, composition comprising contacting a crystalline phosphate selected from the group consisting of sodium pyrophosphate and trisodium phosphate containing less than about 0.1% water with an aqueous solution of surfactant to produce a particulate, crystalline composition comprising between about 0.1% by weight an up to full hydration in the form of water of hydration and between about 0.2 ppm and about 125 ppm of the surfactant.
A method for the preparation of a particulate, crystalline, sodium acid pyrophosphate composition comprising the steps of:
- calcining a sodium phosphate to produce an unmilled calcined product;
- and
- contacting the unmilled calcined product with an aqueous solution of surfactant to produce particulate, crystalline, sodium pyrophosphate composition comprising water in the amount of from between about 0.1% by weight and full hydration in the form of water of hydration and between about 0.2 ppm and about 125 ppm of the surfactant.
A method for the preparation of a particulate, crystalline, trisodium phosphate composition comprising the steps of:
- drying ortho phosphate to produce an unmilled dried trisodium phosphate product;
- milling the unmilled dried product to form a milled calcined product;
- and
- contacting the milled calcined product with an aqueous solution of surfactant to produce a particulate, crystalline, trisodium phosphate composition comprising water in the amount of from about 0.1% by weight up to full hydration in the form of water of hydration and between about 0.2 ppm and about 125 ppm of the surfactant.
Dependencies are inferred from the claim text.