Stretchable adhesive nonwoven fabric and laminate containing the same

• US 6,429,159 B1
• Filed: 07/19/2000
• Issued: 08/06/2002
• Est. Priority Date: 01/28/1998
• Status: Expired due to Term

• Current Assignee: KB Seiren, Ltd.
• Original Assignee: Kanebo, Ltd. (HOYU Company Limited), Kanebo Gohsen, Ltd.
• Inventors: Watanabe, Noboru, Kawada, Teruyoshi, Tanaka, Yutaka, Yamakawa, Yukio, Teshima, Tsutomu
• Primary Examiner(s): Seidleck, James J.
• Assistant Examiner(s): Ribar, Travis B
• Application Number:
  US09/600,549
• Time in Patent Office: 748 Days
• Field of Search: 428/221, 428/339, 428/411.1, 428/500, 428/537.5, 428/423.1, 428/423.3, 428/423.7, 156/106, 156/60, 156/272.2, 156/283, 524/1, 524/500, 528/45, 528/59, 528/67, 528/367, 442/328, 442/329, 442/334, 442/381, 442/394, 442/414
• US Class Current: 442/329
• CPC Class Codes: B32B 2260/021 Fibrous or filamentary layer layers of natural mineral fibres or particles being impregnated in a plastic substance B32B19/02
• CPC Class Codes: B32B 2260/046 Synthetic resin
• CPC Class Codes: B32B 5/022 Non-woven fabric
• CPC Class Codes: B32B 5/04 characterised by a layer being specifically extensible by reason of its structure or arrangement , e.g. by reason of the chemical nature of the fibres or filaments
• CPC Class Codes: B32B 5/26 another layer next to it also being fibrous or filamentary relative arrangement of fibres or filaments of different layers B32B5/12
• CPC Class Codes: C08G 18/664 with compounds of group C08G18/3203
• CPC Class Codes: C08G 18/73 acyclic
• CPC Class Codes: C08L 2666/20 Macromolecular compounds having nitrogen in the main chain according to C08L75/00 - C08L79/00; Derivatives thereof
• CPC Class Codes: C08L 75/04 Polyurethanes
• CPC Class Codes: C08L 75/06 from polyesters
• CPC Class Codes: C08L 77/00 Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 91/06 Waxes
• CPC Class Codes: C09J 175/06 from polyesters
• CPC Class Codes: D04H 3/009 Condensation or reaction polymers
• CPC Class Codes: D04H 3/16 with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
• CPC Class Codes: Y10T 428/249921 Web or sheet containing structurally defined element or component
• CPC Class Codes: Y10T 442/601 Nonwoven fabric has an elastic quality
• CPC Class Codes: Y10T 442/602 Nonwoven fabric comprises an elastic strand or fiber material

Abstract

The present invention is directed to a stretchable adhesive nonwoven prepared by laminating continuous filaments made of a thermoplastic polyurethane resin, which comprises an aliphatic diisocyanate and/or an aromatic diisocyanate, a polymeric diol and a chain-extending agent and has a hardness (JIS-A hardness) of 65 to 98 degree and a flow initiating temperature within a range from 80 to 150° C., into a sheet, and fusion-bonding the filaments themselves with their own heat at the contact point of the laminated filaments thereby to form fibers, and a laminate containing the same. The adhesive nonwoven fabric of the present invention is rich in flexibility and is excellent in adhesion and air permeability.

Claims

1. A stretchable adhesive nonwoven fabric made of a thermoplastic polyurethane resin formed into fibers, said thermoplastic polyurethane resin comprising an aliphatic diisocyanate and/or an aromatic diisocyanate, a polymeric diol and a chain extending agent, characterized in that a hardness (JIS-A hardness) is from 65 to 98 degree and a flow initiating temperature is from 80 to 150°

C.

2. The stretchable adhesive nonwoven fabric according to claim 1, wherein the thermoplastic polyurethane resin is a mixture of a thermoplastic polyurethane resin (A) comprising an aliphatic diisocyanate, a polymeric diol and a chain-extending agent and a thermoplastic polyurethane resin (B) comprising an aromatic diisocyanate, a polymeric diol and a chain-extending agent.

3. The stretchable adhesive nonwoven fabric according to claim 1, wherein the thermoplastic polyurethane resin comprises an aliphatic diisocyanate, a polymeric diol and a chain-extending agent, at least one component of which has one or more methyl side chains in the molecule.

4. The stretchable adhesive nonwoven fabric according to claim 1, which is prepared by laminating substantially continuous filaments into a sheet and fusion-bonding the filaments themselves with their own heat at the contact point of the laminated filaments, wherein the softness is represented by the formula:

5. The stretchable adhesive nonwoven fabric according to claim 1, wherein the air permeation amount Z (cc/cm²/s) as a function of the weight X (g/m²) is within the following range:

6. A laminate comprising the nonwoven fabric of any one of claims 1 to 5 as an intermediate layer and the same or different adherends as upper and lower layer, said laminate being prepared by laminating the nonwoven fabric with the adherends and heat-bonding them.

7. The laminate according to claim 6, wherein the adherend is selected from the group consisting of sheet, film, cloth, nonwoven fabric and paper.