Encapsulated salts of sparing solubility in water, their prepara

Details Encapsulated salts of sparing solubility in water, their prepara Encapsulated salts of sparing solubility in water, their prepara

1985-08-02

1986-08-26

Welsh, Maurice J.

Coating processes

Particles, flakes, or granules coated or encapsulated

Solid encapsulation process utilizing an emulsion or...

156663, 2523152, 2523154, 42721331, 42721332, 42721334, 42840224, 428407, B01J 1302

Patent

active

046082778

ABSTRACT:
Encapsulated salts of organic or inorganic acid particles having sparing solubility in water wherein the salt particles are surrounded by a pressure-resistant, elastic, abrasion-resistant polyurethane/polyurea casing, the ratio by weight of salt to the polyurethane component of the casing material being 1:0.2 to 1:2.5, are produced by emulsifying a mixture of 83 to 28% by weight of the salt to be encapsulated and 17 to 72% by weight of a polyurethane prepolymer containing free isocyanate groups in water in the presence of a protective colloid and reacting the emulsified prepolymer with the equivalent amount of polyamine at temperatures from 0.degree. to 80.degree. C., with vigorous mixing.

REFERENCES:
patent: 4070346 (1978-01-01), Schnoring et al.
patent: 4379071 (1983-04-01), Schnoring et al.

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