Slow release fertilizers

Details Slow release fertilizers Slow release fertilizers

1994-02-16

1995-10-03

Langel, Wayne

Chemistry: fertilizers

Processes and products

Forms or conditioning

71 6411, C05G 500

Patent

active

054548519

ABSTRACT:
An encapsulated slow-release particulate fertilizer product comprising 50-95% by weight of fertilizer and an encapsulating waterproofing sulfurated coat selected from the group of sulfurated unsaturated oils and sulfurated distillation products and distillation residues thereof. The sulfurated coat may bear neutralized carboxylic groups and the product may optionally contain up to 5% by weight of an inert powder serving as conditioner. For making the product an unsaturated oil or a distillation product or residue thereof is reacted with a sulfurization agent and the reaction product is used for the encapsulation of a particulate fertilizer.

REFERENCES:
patent: 3223518 (1965-12-01), Hansen
patent: 3295950 (1967-01-01), Blouin et al.
patent: 3321298 (1967-05-01), Bidlack, Sr. et al.
patent: 3342577 (1967-09-01), Blouin et al.
patent: 3576613 (1971-04-01), Fleming
patent: 4636242 (1987-01-01), Timmons
patent: 4857098 (1989-08-01), Shirley, Jr.
patent: 4885104 (1989-12-01), Sturwold
patent: 5188654 (1993-02-01), Manacastas et al.
patent: 5310785 (1994-05-01), Hayakawa et al.

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