Hot melt adhesive compositions

• US 5,804,519 A
• Filed: 11/05/1997
• Issued: 09/08/1998
• Est. Priority Date: 10/27/1994
• Status: Expired due to Term

• Current Assignee: National Starch and Chemical Investment Holding Corporation
• Original Assignee: National Starch and Chemical Investment Holding Corporation
• Inventors: Riswick, Martin, Raykovitz, Gary F.
• Primary Examiner(s): WOODWARD, ANA LUCRECIA
• Application Number:
  US08/968,869
• Time in Patent Office: 307 Days
• Field of Search: 156/327, 156/334, 604/366, 604/372, 604/373, 428/343-355, 442/392, 442/393, 442/381, 442/389, 442/417
• US Class Current: 442/392
• CPC Class Codes: A61F 13/539 characterised by the connection of the absorbent layers with each other or with the outer layers
• CPC Class Codes: D04H 1/587 characterised by the bonding agents used
• CPC Class Codes: Y10T 442/659 Including an additional nonwoven fabric
• CPC Class Codes: Y10T 442/668 Separate nonwoven fabric layers comprise chemically different strand or fiber material
• CPC Class Codes: Y10T 442/671 Multiple nonwoven fabric layers composed of the same polymeric strand or fiber material
• CPC Class Codes: Y10T 442/673 Including particulate material other than fiber
• CPC Class Codes: Y10T 442/699 Including particulate material other than strand or fiber material

Abstract

A method for improving the strike through properties of hot melt adhesive compositions comprising the step of incorporating therein a nonionic fluorchemical surfactant in an amount of 0.1 to 10 parts by weight per 100 parts adhesive.

Claims

1. A process for bonding tissue or nonwoven substrate to similar or dissimilar substrates in the construction of a disposable absorbent product comprising the steps of applying to at least one substrate a molten hot melt adhesive composition and bonding said substrates together, said hot melt adhesive containing 0.1 to 10 parts by weight of a fluorochemical surfactant per 100 parts of the adhesive.

2. The process of claim 1 wherein the fluorochemical surfactant in the adhesive comprises a blend of C₇ and C₈ fluorinated alkyl alkoxylates and fluorinated C₇ and C₈ alkyl sulfonamides.

3. The process of claim 2 wherein the fluorochemical surfactant comprises 9 to 10% C₈ fluorinated alkyl sulfonamide, 2 to 4% C₇ fluorinated alkyl alkoxylate, 0.1 to 1% C₇ fluorinated alkyl sulfonamide and sufficient C₇ fluorinated alkyl alkoxylate to total 100% by weight.

4. The process of claim 1 wherein the fluorochemical surfactant in the adhesive is present in an amount of 0.5 to 5 parts per 100 parts of the adhesive.

5. The process of claim 1 wherein the hot melt adhesive is based on a polymer selected from the group consisting of ethylene/vinyl acetate copolymers, isotactic polypropylene, atactic polypropylene, styrene-isoprene A-B-A or A-B-A-B block copolymers, sytrene-butadiene A-B-A or A-B-A-B block copolymers, styrene-ethylene-butylene A-B-A or A-B-A-B block copolymers, styrene-ethylene-propylene A-B-A or A-B-A-B block copolymers and mixtures thereof.

6. A disposable absorbent product produced by the process of claim 1.

7. The disposable absorbent product of claim 6 comprising a disposable diaper.

8. The disposable absorbent product of claim 6 comprising a multi-ply sanitary napkin.

9. A disposable absorbent product containing incorporated therein at least one nonwoven substrate containing superabsorbent particulate polymers, wherein the disposable absorbent product is produced by the process of claim 1.