Process for the production of polyurea encapsulated fertilizer p

Details Process for the production of polyurea encapsulated fertilizer p Process for the production of polyurea encapsulated fertilizer p

1996-12-30

1998-12-22

Langel, Wayne

Chemistry: fertilizers

Processes and products

Forms or conditioning

71 6411, C05G 500

Patent

active

058512616

ABSTRACT:
This invention relates to a process for the production of polyurea encapsulated fertilizer particles. These are produced by applying an isocyanate-reactive component which contains at least two amine groups to fertilizer particles to form amine coated particles, and applying a polyisocyanate component to the amine coated particles to form polyurea coated particles. These steps may optionally be repeated in successive order. The resultant polyurea encapsulated fertilizer particles contain from about 0.5 to 15% by weight of polyurea, based on the total weight of the encapsulated fertilizer particles. Instead of using an amine group containing isocyanate-reactive component, water can be applied first.

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patent: 5645624 (1997-07-01), Naka et al.
Database WPI, Section Ch, AN 85-008911, XP002064478 & JP 63 313 704A (Daiichi Kogyo Seiyaku Co. Ltd.) Dec. 21, 1988.
Database WPI, Section Ch, AN 96-500887, XP002064479 & JP 08 257 394 A (Mitsui Toatsu Chem Inc.), Oct. 8, 1996.

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