Kolon Industries, Inc.

In-Sik Han

So-Yeon Kwon

Jae-Young Lee

Seung-Hwan Lee

Jae-Young Kim

Chang-Bae Lee

Tae-Hak Park

Yoeng-Baeg Choi

Young-Hwan Lee

Seung-Hwan 205-403 Magwang Apt Lee

Jae-Young c/o Kolon Central Research Park Lee

Disclosed are wholly aromatic polyamide filament and a method of manufacturing the same, characterized by comprising multi-stage injection of a coagulant with sulfuric acid concentration lowered sequentially stage by stage, to a spun material fed into a coagulant injection tank. The present invention enables increase of a spinning and take-up velocity without occurrence of thread cutting by uniformly and evenly coagulating surface and inside of the spun material. In addition, the present invention recovers the coagulant or water already used and reuses the recovered coagulant or water in the earlier stages, so that it has advantages of saving production costs and reducing environmental contamination. Accordingly, the wholly aromatic polyamide filament produced according to the present invention has high crystallinity X, large apparent crystal size ACS and reduced defects in the crystal itself, thereby exhibiting more improved physical properties such as strength and modulus.

Process of making wholly aromatic polyamide filament

Disclosed are wholly aromatic polyamide filament and a method of manufacturing the same, characterized in that, in the process of preparing the wholly aromatic polyamide polymer, the aromatic diamine, aromatic diacid chloride and polymerization solvent put into the reactorare agitated by an agitation device which is installed in the reactorand consists of: (i) a rotordriven by a motorand having a plurality of pins; and (ii) a statorhaving a plurality of pins, wherein spin speed of the rotoris controlled to 10 to 100 times of both of feeding rates for the aromatic diacid chloride and the aromatic diamine in the polymerization solvent into the reactor and, at the same time, contact frequency between the pinsand the pinsis regulated within a range of 100 to 1,000 Hz. The present invention is effective to progress uniform and homogeneous polymerization over all of area of a polymerization reactor, thereby reducing deviation in degree of polymerization, since polymeric monomers are miscible and react together very well in the reactor. Accordingly, the wholly aromatic polyamide filament produced exhibits narrow PDI and lowered paracrystalline parameter gleading to reduction of defects of a crystal itself, so as to considerably improve strength and modulus thereof.

Process of making aromatic polyamide filament

Disclosed are wholly aromatic polyamide filament and a method of manufacturing the same, characterized in that, in a process of preparing wholly aromatic polyamide polymer, a multiple tubular feed pipe for polymeric monomer and polymerization solvent with specific construction of adjacent inner pathsand outer pathswhich are alternately arranged one another is used to feed either aromatic diacid chloride A or aromatic diamine dissolved in the polymerization solvent B into a polymerization reactorthrough corresponding one among the inner and outer pathsand. The present invention is effective to progress uniform and homogeneous polymerization over all of area of a polymerization reactorleading to reduction of deviation in degree of polymerization, since polymeric monomers are miscible and react together very well immediately after putting the monomers into the reactor. Accordingly, the wholly aromatic polyamide filament produced exhibits narrow PDI and increased ACS, so as to considerably improve strength and modulus thereof.

Aromatic polyamide filament and method of manufacturing the same

The present invention discloses microcellular fibers, in which microcells are formed with a density of more than 10cells/cmwith a supercritical fluid introduced into fiber forming polymers and have a rate of volume expansion of 1.2 to 50, ratio of microcell length to microcell diameter of more than 2 and a monofilament diameter of more than 5 &#x3bc;m. The microcellular fibers provide high and uniform cell densities and are good in the rate of volume expansion and the ratio of cell length to cell diameter, thus they are very excellent in lightweight feeling and touch. The microcellular fibers are made by a method for making microcellular fibers, wherein a supercritical fluid is introduced into an extruder upon melting and mixing fiber forming polymers in the extruder, to thus prepare a single-phase solution of molten polymer and gas, then the single-phase solution of molten polymer and gas is extruded (spun) through spinneret of spinning pack by subjecting the single-phase solution to a rapid pressure drop, to thus make microcellular extrusion materials, the microcellular extrusion materials are rapidly cooled by a cooling medium, and then they are wound at a winding speed of 10 to 6,000 m/min so that a spinning draft can be 2 to 300.

Microcellular foamed fiber, and a process of preparing for the same

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Daegu, South Korea

In-Sik Han