Chemistry: fertilizers – Processes and products – Forms or conditioning
Patent
1986-08-18
1987-12-08
Lander, Ferris H.
Chemistry: fertilizers
Processes and products
Forms or conditioning
71110, 71117, 71 28, 71 6412, 71 6411, A01N 3738, A01N 4348, A01N 4364, C05C 900
Patent
active
047116595
ABSTRACT:
An attrition resistant controlled release fertilizer comprising: NH.sub.2 -containing water soluble central particles such as urea, surrounded and chemically bonded with a base coating, consisting of substituted ureas, formed by reacting a molecular excess of polyfunctional isocyanate with the NH.sub.2 groups of the central particles, and a water insoluble layer, surrounding and chemically bonded with the base coating, formed by the reaction and polymerization of the excess isocyanate with anhydrous organic polyols. If desired, 1 to 10 water insoluble coatings may surround the sealing layer. The base coating's substituted ureas may be effectively formed with diphenylmethane diisocyanate and the sealing layer, with polyethyleneterephthalate polyester polyols containing triethanolamine or melamine catalyst. Central particles effectively coated include: urea, biuret, ureaform, guanidine, melamine, and ammonium salts. A preparation method is provided.
REFERENCES:
patent: 3232739 (1966-02-01), Belak
patent: 3252786 (1966-05-01), Bozzelli et al.
patent: 3259482 (1966-07-01), Hansen
patent: 3264089 (1966-08-01), Hansen
patent: 3300293 (1967-01-01), Bozzelli et al.
patent: 3342577 (1967-09-01), Blouin et al.
patent: 3475154 (1969-10-01), Kato
patent: 4120685 (1978-10-01), Vargiu et al.
CA 93(22):206283y, "Moisture Curable Coating Materials", 1980, Dupont.
CA 84:29810, J. Urea Fertilizer Coating, Hiroshi Takashima, Fusao Yamada; Japanese Kokai 75,129,362, Oct. 13, 1975.
CA 87:52162, U. Slow Releasing Coated Granular Fertilizer, Toshiharu Yamazaki, Masao Eguchi, Yataka Takada, Hachiro Tadenuma, Kuniharu Nakajima, Sadashi Yamashita, Japanese Kokai 77,38,361, Mar. 24, 1977.
LandOfFree
Attrition resistant controlled release fertilizers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Attrition resistant controlled release fertilizers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Attrition resistant controlled release fertilizers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-21445