Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1982-07-12
1983-07-26
Cannon, James C.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264177F, 2642102, 2642107, 2642108, B32B 2702, D01F 802, D01F 810, D02G 300
Patent
active
043953778
ABSTRACT:
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.
REFERENCES:
patent: 4012346 (1977-03-01), Makiyama et al.
patent: 4351879 (1982-09-01), Kondo et al.
Chemical Abstracts, 78:148816 (1973), 89:130849 (1978), 91:158915 (1979), 92:23676 (1980), 94:4881 (1981).
Kondo Yoshikazu
Yamamoto Takaji
Yamamoto Toshihiro
Cannon James C.
Kanebo Ltd.
Kanebo Synthetic Fibers Ltd.
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