Impregnated porous granules with slow release pore membranes...

Details Impregnated porous granules with slow release pore membranes... Impregnated porous granules with slow release pore membranes...

A - Human Necessities

01

N

167/3, 117/46

A01N 25/26 (2006.01) B01J 2/00 (2006.01) C05G 3/00 (2006.01)

Patent

CA 1118647

PR-5396 IMPREGNATED POROUS GRANULES WITH SLOW RELEASE PORE MEMBRANES AND PROCESS THEREFOR Abstract of the Disclosure Open-ended pores of a porous granule are filled with a liquid material which is at least partially immis- cible with water, and sealed with a porous polyurea mem- brane which limits the release rate of the material into the surrounding medium. The membrane is formed by (a) applying to the bare granule an organic solution comprising the liquid material and an organic polyisocyanate, followed by (b) applying to the granule an aqueous solution comprising water and a catalytic amount of a catalyst selected from the group consisting of a basic organic tertiary amine and an alkyl tin carboxylate.

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