Three-layer nonwoven composite structure

Details Three-layer nonwoven composite structure Three-layer nonwoven composite structure

1992-06-17

1993-01-12

Cannon, James C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

152091, 15223, 156 624, 156 626, 156 628, 156281, 1563084, 428286, 428287, 428288, 428296, 428302, 428409, 428422, 428447, B32B 524, B32B 3120, B32B 3300, D04H 314, D04H 316

Patent

active

051789329

ABSTRACT:
A nonwoven composite structure is provided which has three melt-extruded nonwoven layers, each of which includes at least a portion of a nonwoven web. The first nonwoven web is adjacent to one surface of the second nonwoven web and the third nonwoven web is adjacent to the other surface of the second nonwoven web. The first and third nonwoven webs consist of continuous and randomly deposited filaments having an average filament diameter in excess of about 7 micrometers. The second nonwoven web consists of substantially continuous and randomly deposited microfibers having an average diameter of from about 0.1 to about 10 micrometers. The microfibers of the second nonwoven web are prepared from a mixture of an additive and a second thermoplastic polymer, which additive imparts alcohol repellency to the surfaces of the microfibers. The three nonwoven layers can be prepared independently from polyolefins, polyesters, polyetheresters, and polyamides. The boundary between at least two adjacent melt-extruded nonwoven layers is indistinct in that fibers at or near the surfaces of such adjacent layers are significantly intermingled. At least one of the first and third nonwoven webs has been treated by topical application of at least one agent to alter or enhance the surface characteristics of the filaments in the web, the topical treatment being carried out in a manner such that each topically applied agent is substantially restricted to the web to which it was applied. Finally, the composite structure has been pattern bonded by the application of heat and pressure.

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