Idemitsu Kosan Company, Limited

Toshitaka Kanai

Yutaka Minami

Tomoaki Takebe

Yohei Koori

Takeharu Tajima

(1) An elastic nonwoven fabric and a fiber product using the elastic nonwoven fabric, the elastic nonwoven fabric containing a crystalline resin composition containing low crystalline polypropylene and high crystalline polypropylene, the low crystalline polypropylene satisfying items (a) and (b) below, and a crystallization temperature (Tc) of the crystalline resin composition measured with a differential scanning calorimeter (DSC) being from 20 to 100&#xb0; C.: (a) a melting point (Tm-D) being from 0 to 120&#xb0; C., which is defined as a peak top of a peak observed on the most high temperature side of a melt endothermic curve obtained by maintaining at &#x2212;10&#xb0; C. for 5 minutes and increasing in temperature at 10&#xb0; C. per minute in a nitrogen atmosphere with a differential scanning calorimeter (DSC); and (b) a stereoregularity index ([mm]) being from 50 to 90% by mol; (2) an elastic nonwoven fabric and a fiber product using the elastic nonwoven fabric, the elastic nonwoven fabric being produced by using a crystalline resin composition containing low crystalline polypropylene satisfying items (c) to (h) below, and a releasing agent: (c) [mmmm]=20 to 60% by mol; (d) [rrrr]/(1&#x2212;[mmmm])&#x2266;0.1; (e) [rmrm]&#x3e;2.5% by mol; (f) [mm]&#xd7;[rr]/[mr]&#x2266;2.0; (g) mass average molecular weight (Mw)=10,000 to 200,000; and (h) molecular weight distribution (Mw/Mn)&#x3c;4; and (3) an elastic nonwoven fabric and a fiber product using the elastic nonwoven fabric, the elastic nonwoven fabric containing core/shell type composite fibers containing low crystalline polypropylene satisfying the items (c) to (h) have excellent elastic recovery property and pleasant texture without stickiness.

Elastic nonwoven fabric, process for producing the same, and textile product comprising the elastic nonwoven fabric

A polypropylene resin having: (1) a melt flow rate (MFR) of 6 to 100 g/10 minutes, (2) a molecular weight distribution (Mw/Mn), measured by gel permeation chromatography, of 3 to 6, and (3) a 116&#xb0; C. non-eluted component content (100-W116(%)) of 50% or more and a content of components eluted at 90&#xb0; C. or less (W90) of 10 to 30%, measured by temperature-rising fractional chromatography (TREF).

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Ichihara, Japan

Toshitaka Kanai