Title:
NONWOVEN FABRIC AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3458924
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a nonwoven fabric excellent in dimensional stability and adhesivity and useful for filters, etc., by extruding polybutylene terephthalate, polyethylene terephthalate, etc., having prescribed intrinsic viscosities, respective ly, in a specific ratio under specified conditions, and subsequently dividing the molded product.
SOLUTION: The first component comprising polybutylene terephthalate having an intrinsic viscosity (η) of 0.4-1.2 and the second component comprising polyethylene terephthalate having a η of 0.4-0.7, polypropylene terephthalate having a η of 0.4-1.0 or their mixture are mixed in a mixing weight ratio of (90-40)/(10-60), kneaded with an extruder at 230-285°C at a rotation speed of 5-30RPM for 0.5-10 mix, extruded at an extrusion rate of 0.1-3g/min/hole in a temperature range of 230-275°C, and subsequently divided to produce the nonwoven fabric having an average fiber diameter of 0.5-20μm, a filling degree of 0.05-0.3 and a dry thermal shrinkage degree of ≤10% at an average temperature between the melting point and the glass transition point of the first component polymer.
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Inventors:
Shigeki Tanaka
Application Number:
JP27104495A
Publication Date:
October 20, 2003
Filing Date:
October 19, 1995
Export Citation:
Assignee:
TOYO BOSEKI KABUSHIKI KAISHA
International Classes:
D04H1/435; D04H1/724; (IPC1-7): D04H1/42; D04H1/72
Domestic Patent References:
| JP795946A | ||||
| JP59223312A | ||||
| JP4178425A |