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OwnerJohn Scott McDaniel, Kirkland W. Vogt +1inventors
InventorsJohn Scott McDaniel, Kirkland W. Vogt, Woodrow P. Gilbert
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In a preferred embodiment, the present process involves subjecting the nonwoven fabric both to an acidic treatment and to a caustic treatment, each of which erodes a portion of the components of the conjugate yarns. The acid treatment, given certain reaction kinetics, removes a portion of the polyamide element of the conjugate filament. The caustic treatment has a similar effect on the polyester element of the conjugate filament, making it more hydrophilic. The at least partial removal of the polyamide component, coupled with the increased hydrophilicity of the polyester component, results in a fabric having enhanced absorptive properties. In an alternate embodiment, treatments with only acid or only caustic solution may be employed.
A fabric comprising continuous conjugate filaments, each of said conjugate filaments further comprising at least a first filament material and a second filament material that are longitudinally separate into elementary filaments, wherein said first filament material is substantially resistant to acid degradation and said second filament material is susceptible to acid degradation, wherein said second filament material comprises a filament skeleton that has been at least partially reconfigured.
A fabric comprising continuous conjugate filaments, each of said conjugate filaments further comprising at least a first filament material and a second filament material that are longitudinally separable into elementary filaments, wherein said first filament material is a polyester and said second filament material is a polyamide, and wherein the relative percentage of said polyamide varies per unit of said fabric.
A fabric comprising continuous conjugate filaments, which further comprise at least a first filament material and a second filament material that are longitudinally separable into elementary filaments, wherein said first filament material is a polyester and said second filament material is a polyamide, and wherein said nonwoven fabric has an absorption capacity of at least 5.5 ml/g.
A fabric comprising continuous conjugate filaments, which further comprise at least a first filament material and a second filament material that are longitudinally separable into elementary filaments, wherein said first filament material is a polyester having hydrolized ester groups and enhanced hydrophilic characteristics by having exposed said polyester to a basic solution and wherein said second filament material is a polyamide whose structure is eroded by having been exposed to an acidic solution.
Dependencies are inferred from the claim text.