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AssigneesKanebo, Ltd., Kanebo Synthetic Fibers Ltd.
InventorsYoshikazu Kondo, Toshihiro Yamamoto, Takaji Yamamoto
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Porous acrylic synthetic fibers having water absorption property and having substantially no microvoids but having mainly macrovoids are produced by spinning an organic solvent solution containing 15.about.35% by weight of a polymer consisting of 2.about.30 parts by weight of cellulose acetate and 70.about.98 parts by weight of an acrylic polymer into a coagulation bath at a temperature of no higher than 30.degree. C., primarily drawing the spun fibers at a draw ratio of 2.5.about.8.0 times to form water swelled fibers wherein macrovoids are distributed, drying the water swelled fibers at a temperature of 100.about.180.degree. C. to a water content of no greater than 1.0% by weight and secondarily drawing the dried fibers under wet heat to elongate the macrovoid structure. This invention includes acrylic composite fibers having water absorption property wherein at least one of components A and B consisting of 2.about.50% by weight of cellulose acetate and 50.about.98% by weight of an acrylic polymer and another component B consisting of an acrylic polymer are bonded in a conjugate ratio of 2/8.about.8/2 (by weight) along the fiber axial direction, one component A has substantially no microvoid but has mainly macrovoids, and the method for producing said acrylic composite fibers.
A method for producing porous acrylic synthetic fibers having substantially no microvoids but having mainly macrovoids wherein a surface area A of the voids is not greater than 15 m.sup.2 /g, a porosity V is 0.05.about.0.75 cm.sup.3 /g and V/A is 1/30 or more, which comprises spinning an organic solvent solution containing 15.about.35% by weight of a polymer consisting of 2.about.30 parts by weight of cellulose acetate and 70.about.98 parts by weight of an acrylic polymer into a coagulation bath at a temperature of no higher than 30.degree. C. to form fibers wherein the formation of microvoids is restrained, primarily drawing the spun fibers at a draw ratio of 2.5.about.8.0 times to form water swelled fibers wherein macrovoids are distributed, drying the water swelled fibers at a temperature of 100.degree..about.180.degree. C. to a water content of no greater than 1.0% by weight to substantially eliminate microvoids and secondarily drawing the dried fibers under wet heat at a draw ratio of no greater than 3 times to promote the macrovoid structure.
A method for producing acrylic composite fibers having water absorption property wherein a cellulose acetate containing-component has substantially no microvoids but has mainly macrovoids, a porosity of the total fibers is 0.05.about.0.75 cm.sup.3 /g and a surface area of the voids is not greater than 15 m.sup.2 /g, which comprises conjugate spinning two organic solvent solutions A and B, at least one of the solutions containing a polymer consisting of 2.about.50% by weight of cellulose acetate and 50.about.98% by weight of an acrylic polymer, into a coagulation bath at a temperature of no higher than 30.degree. C. through common orifices to form composite fibers wherein the formation of microvoids is restrained, primarily drawing the spun fibers at a draw ratio of 2.5.about.8 times to obtain water swelled fibers having distributed macrovoids, drying the swelled fibers at a temperature of 100.degree..about.180.degree. C. to a water content of no greater than 1.0% by weight to substantially eliminate microvoids and secondarily drawing the dried fibers under wet heat at a draw ratio of no greater than 3 times to promote the macrovoid structure.
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