Method for preparing a controlled release composition

Details Method for preparing a controlled release composition Method for preparing a controlled release composition

1981-08-03

1983-06-14

Lusignan, Michael R.

Coating processes

With post-treatment of coating or coating material

Heating or drying

71DIG1, 71117, 162100, 162158, 424 19, 424 22, B05D 302, D21D 300, D21F 1100, A01N 3738

Patent

active

043883524

ABSTRACT:
Controlled release compositions are made by a distillation method to include chemical impregnants (such as animal repellants, pesticides, herbicides, fungicides, plant growth stimulants, perfumes and deodorizers, fertilizers, and drugs) in biodegradable, microporous structures. Each microporous structure collapses upon drying but swells upon rewetting to allow the impregnant entrapped in it to diffuse from the structure. Never-dried wood pulp is a particularly desirable microporous structure because it has large pores initially, a large surface area initially, and demonstrated swelling capability. The method is particularly useful when the impregnant is insoluble in the fluid initially within the microporous structure and when the solvent for the impregnant is immiscible with that fluid.

REFERENCES:
patent: 3137631 (1964-06-01), Soloway
patent: 3172752 (1965-03-01), Pierce
patent: 3697371 (1972-10-01), Schleicher et al.
patent: 3808093 (1974-04-01), Hedstrom

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