Polypropylene flexifilamentary fiber containing 0.1 to 10 weight

Details Polypropylene flexifilamentary fiber containing 0.1 to 10 weight Polypropylene flexifilamentary fiber containing 0.1 to 10 weight

1993-04-07

1996-04-30

Withers, James D.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428288, 428370, 428372, B32B 516, D04H 158, D02G 300

Patent

active

055123570

ABSTRACT:
The present invention relates to a polypropylene three-dimensional plexifilamentary fiber, a method of manufacturing same, and a nonwoven fabric composed of the above fiber.
The plexifilamentary fiber in accordance with the present invention has a three-dimensional plexifilamentary structure, and is characterized in that the fiber has a microwave birefringence of 0.07 or more. As a result, a dimensional stability under heating of the plexifilamentary fiber in accordance with the present invention is extremely high. Moreover, it is possible to obtain a plexifilamentary fiber having a high spreadability by adding a spreading agent to the plexifilamentary fiber. A nonwoven fabric made of such plexifilamentary fiber has a high thermal dimensional stability, and as a result, the nonwoven fabric in accordance with the present can be usefully used in a wrapping material having a heat resistance and air permeability, apparel having heat resistance and moisture permeability, a heat resistance paper, and engineering and building materials or the like.

REFERENCES:
patent: 3081519 (1962-01-01), Blades et al.
patent: 3169899 (1965-02-01), Steuber
patent: 3564088 (1969-09-01), Woodell
patent: 3655498 (1972-04-01), Woodell
patent: 3686848 (1972-08-01), Miller et al.
patent: 3756441 (1973-09-01), Anderson et al.
patent: 3900631 (1975-08-01), Woodell
patent: 4166091 (1979-08-01), Beebe

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