发明名称 |
Method of coating materials and materials formed thereby |
摘要 |
A method of forming a methylol urea prepolymer and a particle coated in with the prepolymer. The method involves providing a source of methylol urea and a source of aldehyde and reacting the urea and the aldehyde in the presence of an excess of urea to form the methylol urea prepolymer. The coated particle is preferably a controlled-release fertilizer particle. The particle is a substrate coated with a substantially uniform coating comprising a total nitrogen content ranging from about 39N to about 42N. The coating includes a low molecular weight methylene urea compounds.
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申请公布号 |
US6515177(B1) |
申请公布日期 |
2003.02.04 |
申请号 |
US20010896694 |
申请日期 |
2001.07.02 |
申请人 |
THE HOMESTEAD CORPORATION |
发明人 |
O'DONNELL, SR. JAMES M. |
分类号 |
C05G3/00;(IPC1-7):C05C9/02;C07C269/04;C07C273/18 |
主分类号 |
C05G3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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