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    • 169. 发明公开
    • Acrylic hot melt pressure sensitive adhesive compositions
    • Zusammensetzungen von druckempfindlichen Schmelzklebstoffen。
    • EP0357229A2
    • 1990-03-07
    • EP89307746.1
    • 1989-07-31
    • E.I. DU PONT DE NEMOURS AND COMPANY
    • Mancinelli, Paul Andrew
    • C09J153/00C09J7/02
    • C08F290/046C09J7/385C09J155/005
    • Acrylic hot melt pressure sensitive adhesive compositions having a good balance of tack, peel and creep resistance at ambient temperature combined with optical clarity and desirable melt viscosity at elevated temperatures are prepared by copolymerizing acrylic and methacrylic alkyl esters of a non-tertiary alcohol or optionally acids with polymerizable poly methacrylate based macromonomers. The resulting acrylic copolymer has a graft or comb structure in which the acrylic backbone has a low Tg and the pendant macromonomer side chains have a Tg above room temperature.
      Compounding these acrylic copolymers with tackifiers and plasticizers dramatically improves the balance of pressure sensitive adhesive properties while lowering melt viscosity into a desirable range. The invention provides significant property enhancements even for acrylic copolymers having poor initial peel and shear adhesive properties. Preferably, the acrylic backbone is tailored by judicious selection of acrylic comonomers to allow compounding with several high performance hydrogenated tackifiers and plasticizers that provide water white and clear adhesive formulations while ensuring long term color stability, weatherability and general durability.
    • 丙烯酸热熔压敏粘合剂组合物在环境温度下具有良好的粘性,剥离和抗蠕变性能,结合光学透明度和在升高的温度下所需的熔融粘度,通过将非叔醇的丙烯酸和甲基丙烯酸烷基酯或任选的酸 与可聚合的聚甲基丙烯酸酯基大分子单体。 得到的丙烯酸共聚物具有接枝或梳状结构,其中丙烯酸主链具有低Tg,并且侧挂大分子单体侧链的Tg高于室温。 将这些丙烯酸共聚物与增粘剂和增塑剂混合显着地改善了压敏粘合剂性能的平衡,同时将熔融粘度降低到期望的范围。 即使对于具有差的初始剥离和剪切粘合剂性质的丙烯酸共聚物,本发明也提供显着的性能增强。 优选地,通过明智地选择丙烯酸类共聚单体来调整丙烯酸主链,以允许与提供水白色和透明粘合剂配方的几种高性能氢化增粘剂和增塑剂混合,同时确保长期的颜色稳定性,耐候性和一般的耐久性。