Encapsulated salts of acid particles wherein the salt particles

Details Encapsulated salts of acid particles wherein the salt particles Encapsulated salts of acid particles wherein the salt particles

1984-09-06

1985-10-15

Welsh, Maurice J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

156603, 2523152, 2523154, 428407, B01J 1302

Patent

active

045474290

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:
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patent: 3886085 (1975-05-01), Kiritani et al.
patent: 3900669 (1975-08-01), Kiritani
patent: 4021595 (1977-05-01), Kiritani et al.
patent: 4070346 (1978-01-01), Schnoring et al.
patent: 4230809 (1980-10-01), Heinrich et al.
patent: 4379071 (1983-04-01), Schnoring et al.

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