Granular fertilizer with a multilayer coating
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United States of America Patent
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Jul 8, 1997
Grant Date -
N/A
app pub date -
Nov 29, 1994
filing date -
Jul 21, 1993
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention provides a granular fertilizer with a multilayer coating comprising a first layer containing at least one rapidly biodegradable polymer selected from the group consisting of a rapidly biodegradable aliphatic polyester and a rapidly biodegradable polyurethane compound, and a water-insoluble second layer containing at least one slowly biodegradable polymer selected from the group consisting of a slowly biodegradable cellulose derivative, low molecular weight polyethylene, low molecular weight wax and low molecular weight paraffin or light-degradable resins. The granular fertilizer with a multilayer coating of the present invention is characterized in that it is coated with coating materials having different dissolving-out rates, that dissolving-out of the fertilizer nutrients is controlled, and that the coating does not persist after the nutrients are dissolved out. Accordingly, the granular fertilizer coated with a multilayer of the present invention has less damaging effects on nature.
First Claim
Family
International Classification(s)
Cited Art Landscape
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