Preparation of ureaform

Details Preparation of ureaform Preparation of ureaform

1977-06-29

1978-10-31

Lusignan, Michael R.

Coating processes

Particles, flakes, or granules coated or encapsulated

Resin base

71 27, 71 28, 71 64DB, 427213, 252384, C05C 102, C05C 700, C05C 902

Patent

active

041235703

ABSTRACT:
Preparation of ureaform granules. A concentrated aqueous solution of a urea-formaldehyde condensate is mixed with a catalyst which at normal temperature effects virtually no acid condensation, but a elevated temperature releases sufficient strong acid to effect the acid condensation in a few seconds. The mixture of solution and catalyst is sprayed over solid ureaform particles maintained in spaced interrelationship and at such a temperature that the catalyst is decomposed and effects acid condensation, whereby the sprayed particles are coated with a layer of ureaform and dried.

REFERENCES:
patent: 2845401 (1958-07-01), Gilliam
patent: 3477842 (1969-11-01), Cook et al.
patent: 3635690 (1972-01-01), Griffith
patent: 3649598 (1972-03-01), Namioka et al.
Urea-Formaldehyde Reactions in the Fertilizer Industry, O'Donnell, James M. et al., Nitroform Agricultural Chemicals, 1957.

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