Nonwoven webs having zoned migration of internal additives
AssigneeKimberly-Clark Worldwide, Inc.
InventorsRoger Bradshaw Quincy, III, Ali Yahiaoui, Jeffrey Lawrence McManus
Life of this patent
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Abstract
Nonwoven webs prepared from a blend of polymer and a migrating internal additive are heat treated only in selected regions to cause surface migration of the additive in those regions. The nonwoven webs have a desired property attributed to the additive in the selective regions. Regions surrounding the selected regions are not heat treated, and are either devoid of the desired property, or manifest the property to a lesser extent than in the heat treated regions.
Claims28
A nonwoven fabric having one or more selectively zoned regions of additives arranged in stripes on an outer surface, and one or more areas laterally adjacent to the stripes not in the selectively zoned regions, comprising:
- a plurality of nonwoven filaments made from a blend including one or more polymers and a migrating internal additive;
- wherein the internal additive has migrated to the surface to a greater extent in the selectively zoned regions than in the areas not in the selectively zoned regions.
A nonwoven fabric prepared from a substantially homogeneous blend including a polymer and an internal additive having a tendency to migrate to a surface of the nonwoven web when exposed to heat, the nonwoven web comprising:
- a plurality of nonwoven filaments made from the substantially uniform blend of polymer and internal additive;
- one or more zones on the nonwoven web which have been selectively exposed to heat to cause selective migration of the internal additive to the surface;
- and
- one or more zones on the nonwoven web laterally adjacent to, and having less internal additive at the surface than the one or more zones selectively exposed to heat.
Dependencies are inferred from the claim text.