High wet-strength polyolefin blown microfiber web

Details High wet-strength polyolefin blown microfiber web High wet-strength polyolefin blown microfiber web

1989-04-21

1990-06-12

Bell, James J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including interlaminar mechanical fastener

428297, 428903, 524583, B32B 500

Patent

active

049332295

ABSTRACT:
A polyolefin BMF web made from a mixture of polypropylene and surfactant can have high wet strength when (a) the surfactant is nonionic and (b) the surfactant is mixed with the polypropylene at a static mixer that interconnects the extruder and the BMF die. By so postponing the addition of the surfactant, it is protected from both the exceedingly high temperatures of the extruder and from the high shearing forces within the extruder. The surfactant also is heated to high temperatures for a much shorter time than if it were premixed with the polypropylene.

REFERENCES:
patent: Re31885 (1985-05-01), Meitner
patent: 3870567 (1975-03-01), Palmer et al.
patent: 3933525 (1976-01-01), Palmer et al.
patent: 4070218 (1978-01-01), Weber
patent: 4189420 (1980-02-01), Sugimoto et al.
patent: 4328279 (1982-05-01), Meitner et al.
patent: 4578414 (1986-03-01), Sawyer et al.
patent: 4753843 (1988-06-01), Cook et al.

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