Method for making a phosphate containing concentrated heavy duty

Coating processes – Particles – flakes – or granules coated or encapsulated – Applying superposed diverse coatings or coating a coated base

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252 91, 252140, 25217413, 25217421, 25217425, 427215, 427220, C11D 3075, C11D 312, C11D 1100, C11D 1706

Patent

active

046667385

ABSTRACT:
A free flowing particulate heavy duty laundry detergent containing no more 8.7% of phosphorus (from phosphate) is comprised of sodium tripolyphosphate particles having nonionic detergent in the interior and on the surface thereof, which adheres a coating of smaller particles of ion-exchanging zeolite to the phosphate. Also within the invention is a method of making such a product by pre-mixing spray dried sodium tripolyphosphate particles and smaller zeolite particles and admixing with them, as by spraying, in liquid form, onto moving particles, a normally liquid or pasty nonionic detergent, such as a higher fatty alcohol polyethylene oxide condensation product, which penetrates the sodium tripolyphosphate particles and adheres zeolite particles to the surfaces thereof.

REFERENCES:
patent: 3290158 (1966-12-01), Treat
patent: 3755180 (1973-08-01), Austin
patent: 3868336 (1975-02-01), Mazzola
patent: 3915878 (1975-10-01), Yurko
patent: 4248911 (1981-02-01), Wixon
patent: 4260651 (1981-04-01), Wixon
patent: 4274975 (1981-06-01), Corkill
patent: 4347152 (1982-08-01), Wixon
patent: 4414130 (1983-11-01), Cheng
patent: 4427567 (1984-01-01), Benz

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