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    • 2. 发明申请
    • COFORM NONWOVEN WEB FORMED FROM MELTBLOWN FIBERS INCLUDING PROPYLENE/ALPHA-OLEFIN
    • 来自含有丙烯/丙烯酸酯的熔融纤维的非织造网
    • WO2011034523A1
    • 2011-03-24
    • PCT/US2009/057041
    • 2009-09-15
    • KIMBERLY-CLARK WORLDWIDE, INC.JACKSON, David, M.SCHMIDT, Michael, A.
    • JACKSON, David, M.SCHMIDT, Michael, A.
    • D04H3/14D04H1/54D04H1/42
    • D04H3/16A47L13/16D04H3/14Y10T442/68
    • A coform nonwoven web that contains a matrix of meltblown fibers and an absorbent material is provided. The meltblown fibers are formed from a thermoplastic composition that contains at least one propylene/α-olefin copolymer of a certain monomer content, density, melt flow rate, etc. The selection of a specific type of propylene/α-olefin copolymer provides the resulting composition with improved thermal properties for forming a coform web. For example, the thermoplastic composition crystallizes at a relatively slow rate, thereby allowing the fibers to remain slightly tacky during formation. This tackiness may provide a variety of benefits, such as enhancing the ability of the meltblown fibers to adhere to the absorbent material during formation of the coform web. In certain embodiments, the coform web may also be imparted with texture using a three- dimensional forming surface. In such embodiments, the slow crystallization rate of the meltblown fibers may increase their ability to conform to the contours of the three-dimensional forming surface. Once the fibers crystallize, however, the meltblown fibers may achieve a degree of stiffness similar to conventional polypropylene, thereby allowing them to retain their three-dimensional shape and form a highly textured surface on the coform web.
    • 提供了一种包含熔喷纤维基体和吸收材料的共成纤维非织造网。 熔喷纤维由含有至少一种具有一定单体含量,密度,熔体流动速率等的至少一种丙烯/α-烯烃共聚物的热塑性组合物形成。特定类型的丙烯/α-烯烃共聚物的选择提供了所得的 具有改进的热性能以形成共模板的组合物。 例如,热塑性组合物以相对较慢的速率结晶,从而允许纤维在形成过程中保持轻微的粘性。 这种粘性可以提供各种益处,例如增强熔喷纤维在共成型纤维网的形成过程中粘附到吸收材料上的能力。 在某些实施例中,也可以使用三维成形表面赋予共模成形网。 在这样的实施例中,熔喷纤维的缓慢结晶速率可以增加其符合三维成形表面轮廓的能力。 然而,一旦纤维结晶,熔喷纤维可获得类似于常规聚丙烯的刚度程度,从而允许它们保持其三维形状,并在共面网上形成高度纹理化的表面。