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    • 2. 发明授权
    • Hot melt adhesives comprising low free monomer, low oligomer isocyanate prepolymers
    • 包含低游离单体,低聚物异氰酸酯预聚物的热熔粘合剂
    • US06280561B1
    • 2001-08-28
    • US09213479
    • 1998-12-17
    • Edwin Lee McInnisThomas Michael SantosussoJeffrey Raymond Quay
    • Edwin Lee McInnisThomas Michael SantosussoJeffrey Raymond Quay
    • C09J500
    • C09J175/04C08G18/10C08G2170/20C08G18/307C08G18/302
    • A method for adhesively joining or sealing two substrates which comprises: (1) applying at about 50° to 150° C. onto a substrate a solvent-free, moisture curable urethane hot melt adhesive composition comprising the polyisocyanate prepolymer reaction product of (a) a polyol and (b) a polyisocyanate; (2) contacting the adhesive disposed on the substrate to a second substrate such that a green bond is formed, and (3) exposing the adhesive bond to ambient moisture causing a crosslinking reaction within the adhesive, thereby forming a moisture-cured bond. The improvement is characterized in that the polyisocyanate prepolymer is prepared by reacting a polyisocyanate with a functionality of at least 2 with a polyol with a functionality of at least 2, the reaction product comprising at least 90 wt % “perfect” prepolymer and less than 2 wt % unreacted isocyanate monomer and the prepolymer having a free NCO functionality ranging from 0.2 to 8 wt %.
    • 一种用于粘合地接合或密封两个基底的方法,其包括:(1)在基底上施加约50至150℃的无溶剂的湿固化聚氨酯热熔粘合剂组合物,其包含(a)多元醇的多异氰酸酯预聚物反应产物 和(b)多异氰酸酯;(2)将设置在基材上的粘合剂与第二基材接触,使得形成绿色粘结,和(3)将粘合剂粘合暴露于周围的水分,导致粘合剂内的交联反应,从而形成 湿固化粘合剂。 改进的特征在于多异氰酸酯预聚物是通过使多官能度至少为2的多异氰酸酯与官能度至少为2的多元醇反应制备的,反应产物包含至少90重量%的“完美”预聚物和小于2 wt%未反应的异氰酸酯单体和具有0.2-8wt%游离NCO官能度的预聚物,