Kuraray Co., Ltd.

Tetsuya Okamoto

Akihiro Uehata

Yasuhiro Shirotani

Satoshi Katsuya

Takayuki Ikeda

Soichi Obata

Tetsuya Tomosugi

Provided are a melt blown (MB) nonwoven fabric, a laminate using the same, a method of producing a melt blown nonwoven fabric as well as a melt blowing apparatus. A melt blowing apparatusincludes a dieconfigured to discharge a resin meltwith an accompanying jet to give fiber materials, a hollow cover, and a collector. The fiber materialsfrom the dieare heated to a temperature equal to or higher than a crystallization temperature of crystalline thermoplastic resin inside the hollow coverand collected on a collecting surfaceof the collector. The hollow coverand the collectorare separated by a distance of 5 cm or longer between a lower edgeof the hollow coverand the collecting surfacein a line extending downwardly from the nozzle holesin a vertical direction.

Melt blown nonwoven fabric, laminate using same, melt blown nonwoven fabric production method and melt blowing apparatus

Provided is a polyetherimide-based fiber containing a polyetherimide resin and carbon black dispersed in the resin, wherein the content of the carbon black is 0.03 wt % or greater; the carbon black has a primary particle number-mean particle size of from 30 nm to 500 nm; and the fiber has a weight reduction rate of less than 0.5% around the glass transition point (Tg) of the polyetherimide resin, where the weight reduction rate is defined by a following formula (1).Weight reduction rate (%)={[(fiber weight at temperature1)&#x2212;(fiber weight at temperature2)]/(fiber weight at temperature1)}&#xd7;100&#x2003;&#x2003;(1) Where T1 denotes a temperature (Tg&#x2212;15&#xb0; C.) that is 15&#xb0; C. lower than the glass transition point (glass transition temperature) of the polyetherimide resin, and T2 denotes a temperature (Tg+25&#xb0; C.) that is 25&#xb0; C. higher than the glass transition point.

Polyetherimide-based fiber, method for manufacturing same, and fiber structure containing same

Provided is a flame-retardant fiber having improved light resistance and/or colorability. The flame-retardant fiber is a fiber including a fiber-forming polymer. The fiber-forming polymer contains a polymer blend comprising a polyetherimide polymer (A) and a thermoplastic polymer (B) having a glass transition temperature lower than that of the polymer (A); and the fiber-forming polymer further contains a functional additive (C) that provides light resistance, colorability, or both of light resistance and colorability. The mass ratio (A)/(B) of the polymer (A) to the polymer (B) is from 50/50 to 90/10, and the content of the functional additive (C) is from 0.5 to 10% by mass relative to 100% by mass of the total mass (A+B+C) of the polymer (A), the thermoplastic polymer (B), and the functional additive (C).

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Kurashiki, Japan

Tetsuya Okamoto