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公开(公告)号：US20220389163A1
公开(公告)日：2022-12-08
申请号：US17755751
申请日：2020-10-22
申请人： Kureha Corporation
发明人： Takashi MASAKI , Yoshinori SUZUKI
摘要： A method for producing a polyamide of the present invention, the method including polymerizing a raw material monomer having at least one alkylene group and at least one amide bond in the presence of a basic catalyst and a polymerization initiator. The number of carbons of the alkylene group is 1 or more and 3 or less. The polymerization initiator is a linear carboxylate having a structure derived from a secondary or tertiary alcohol.
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公开(公告)号：US20240279847A1
公开(公告)日：2024-08-22
申请号：US18566864
申请日：2022-05-20
申请人： KUREHA CORPORATION
CPC分类号： D01F6/60 , D01D5/0885 , D10B2331/02 , D10B2401/063 , D10B2507/00
摘要： To provide a monofilament of PA4, which has a low density. The monofilament of polyamide 4 in an embodiment of the present invention has a density of 1.230 g/cm3 or less. A method for producing a monofilament of polyamide 4 according to an embodiment of the present invention includes: melt-extruding polyamide 4; and cooling a melted and extruded matter of the polyamide 4 obtained by the melt-extruding process, at −10° ° C. or lower by using a nonpolar solvent.
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公开(公告)号：US20240271331A1
公开(公告)日：2024-08-15
申请号：US18566847
申请日：2022-05-20
申请人： Kureha Corporation
IPC分类号： D01F6/60
CPC分类号： D01F6/60
摘要： To provide a monofilament of polyamide 4 (PA4) having high tensile characteristics even when the monofilament is knotted. A monofilament of PA4, in a scattering vector in a range of 0.02 nm−1 or greater and 0.04 nm−1 or less measured by small-angle X-ray scattering, the monofilament having an average value of a ratio I2/I1 of a normalized scattering intensity I2 in an equatorial direction to a normalized scattering intensity I1 in a meridian direction of 5 or less. A birefringence of the monofilament is 50×10−3 or greater.
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