Method for preparing a nonwoven web containing antimicrobial sil

Details Method for preparing a nonwoven web containing antimicrobial sil Method for preparing a nonwoven web containing antimicrobial sil

1994-05-26

1996-10-22

Wilson, D. R.

Plastic and nonmetallic article shaping or treating: processes

With twining, plying, braiding, or textile fabric formation

264211, 424404, 424443, 524188, 525102, 556423, D04H 300, D01D 504, D01F 110

Patent

active

055673724

ABSTRACT:
A method for preparing a nonwoven web having antimicrobial properties which involves melting a melt-extrudable thermoplastic composition, extruding the molten composition through multiple orifices to form streams of molten composition, cooling the streams of molten composition to form fibers, and randomly depositing the fibers on a moving foraminous surface to form a web. The thermoplastic composition includes a thermoplastic material and an additive. The additive is an antimicrobial siloxane quaternary ammonium salt which can be either of two general classes: (1) a trisiloxane having a pendent quaternary ammonium group and a molecular weight of from about 600 to about 1,700; and (2) an ABA-type siloxane having a polydispersity of up to about 3.0 and a weight-average molecular weight of from about 800 to about 2,000, in which a central siloxane moiety is terminated at each end by a quaternary ammonium salt group. The anion in general can be any anion which does not adversely affect the thermal stability of the salt.

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