Nonwoven fabrics and method for producing them

Details Nonwoven fabrics and method for producing them Nonwoven fabrics and method for producing them

1987-10-15

1989-04-04

McCamish, Marion C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

156 624, 156 626, 1563082, 428288, 428296, 428373, 428374, D02G 200

Patent

active

048185876

ABSTRACT:
Nonwoven fabrics contain at least 30% by weight of heat-adhesive composite fibers consisting of core portion and sheath portion, said core portion being of the side-by-side type composite structure comprising two core components of different polypropylene base polymers in a composite ratio of 1:2 to 2:1, one of said core components having a Q value, expressed in terms of the weight-average molecular weight/the number-average molecular weight, equal to or higher than 6 and the other having a Q value equal to or lower than 5, and said sheath portion meeting at least the requirement that it should comprise a sheath component of a polyethylene base polymer having a melting point lower by at least 20.degree. C. than the lower one of the melting points of said two core components. The nonwoven fabrics are bulky and soft due to the crimps of the heat-adhesive composite fibers resultant from the core portion and are stabilized by the inter-fiber bonds of the sheath portion.

REFERENCES:
patent: 3511747 (1970-05-01), Davies
patent: 4370114 (1983-01-01), Okamoto et al.
patent: 4469540 (1984-09-01), Furukawa et al.
patent: 4551378 (1985-11-01), Carey

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