专利名称：Urea formaldehyde dispersions modified
with higher aldehydes
发明人：Paul Sartoretto,Kak-Yuen Tao申请号：US06/269773申请日：19810603公开号：US04332610A公开日：19820601
摘要：A process for the preparation of neutralized, urea aldehyde polymeric
dispersions by acid catalyzed reaction of urea and formaldehyde plus a higher aldehyde,having from two to four carbon atoms, wherein the mol ratio of formaldehyde to thehigher aldehyde is at least 2:1 and the function of the higher aldehyde is to act as aninhibitor of further polymerization. The dispersions are further stabilized against settlingby the addition of thickener-suspending agents. The products of the process are usefulas sources of nitrogen which continue to fertilize plants, especially grasses for longperiods of time after applied by means of conventional spraying equipment.
申请人：W. A. CLEARY CHEMICAL CORPORATION
代理人：Abraham Wilson
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