Patent ID: 8105654
Filing Date: 2012-01-31
Classification: B32B,D01F,D04H,D06M,Y10T

Abstract:
1. A method for producing thermoadhesive conjugate fibers, the method comprising: providing a first thermoplastic resin component comprising a modified polyolefin with at least one type of reactive functional group and a second thermoplastic resin component comprising polyester with a higher melting point than the melting point of the first thermoplastic resin component, wherein the component ratio of the first component and the second component in fiber cross-section is in the range of 10/90 to 90/10; spinning the first thermoplastic resin component and the second thermoplastic resin component at a temperature of from 180 to 350 ° to obtain spun conjugate fibers comprising the first and the second thermoplastic resin components, the first component being formed continuously along the length of at least of a portion of the conjugate fiber surface; drawing the spun conjugate fibers at a temperature lower than the melting point of the first thermoplastic resin component to obtain drawn conjugate fibers; and coating the surfaces of the drawn conjugate fibers with a fiber treating agent comprising a multifunctional compound reacting with the reactive functional group of the modified polyolefin, the coating ranging from 0.1 to 2.0 wt%, based on the weight of the fibers, to form the thermoadhesive conjugate fibers, whereupon the multifunctional compound reacts with the reactive functional group of the modified polyolefin at a temperature above the melting point of the first thermoplastic resin component and below the melting point of the second thermoplastic resin component, to form a crosslinked structure at adhesive points between the thermoadhesive conjugate fibers, provided that when the multifunctional compound is a polyamine, the polyamine is ethylenediamine or diethylenetriamine.