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    • 6. 发明授权
    • Abrasion resistant topcoats for control release coatings
    • 耐磨面漆,用于控释层
    • US5628813A
    • 1997-05-13
    • US993686
    • 1992-12-21
    • Frank Shi-Chow ChenAlbert J. Geiger
    • Frank Shi-Chow ChenAlbert J. Geiger
    • C05G3/00
    • C05G3/0029C05G3/0041
    • The present invention provides for controlled release chemical compositions having improved controlled release properties wherein core substrate particles comprising a water soluble chemical compound, such as a fertilizer or oil well chemical, which are surrounded and encapsulated by a controlled release coating which is slowly permeable to water, such as a thin layer of polymeric material, are further overcoated with one or more coating layers comprising a finely divided filler preferably talc, dispersed in a metal or ammonium lignosulfonate binder. The outer coating serves to protect the underlying, thin film, controlled release coating from abrasion and impact damage occasioned by packaging, blending and dispensing equipment, thereby preserving the water permeating properties designed into such coating. The outer protective coating is itself permeable to water, allowing the layer beneath it to control the rate of water contact with the substrate core and subsequent release of the core substance into its environment.
    • 本发明提供了具有改进的控制释放特性的控释组分,其中包含水溶性化合物如肥料或油井化学物质的核心基质颗粒,其被缓慢渗透水的控制释放涂层包围和包封 ,例如聚合物材料的薄层,进一步用包含分散在金属或木质素磺酸铵粘合剂中的细分散填料优选滑石的一个或多个涂层进行涂覆。 外涂层用于保护底层的薄膜控释层免受包装,混合和分配设备所引起的磨损和冲击损伤,从而保留设计成这种涂层的水渗透性能。 外部保护涂层本身是透水的,允许其下面的层控制与基底芯接触的水的速率,随后将核心物质释放到其环境中。