Hot melt adhesive compositions with improved wicking properties

• US 5,685,758 A
• Filed: 04/12/1996
• Issued: 11/11/1997
• Est. Priority Date: 04/12/1996
• Status: Expired due to Term

• Current Assignee: Henkel IP & Holding GmbH (Henkel AG & Co KGaA)
• Original Assignee: National Starch and Chemical Investment Holding Corporation
• Inventors: Wu, Bing, Raykovitz, Gary, Tong, Quinn, Wagner, Lydia, Paul, Charles W., Sharak, Matthew L.
• Primary Examiner(s): DAVIS, JENNA L
• Application Number:
  US08/631,390
• Time in Patent Office: 578 Days
• Field of Search: 428/355, 428/261, 428/355 EN, 442/409, 442/411, 442/414
• US Class Current: 442/409
• CPC Class Codes: A61L 15/34 Oils, fats, waxes or natural resins A61L15/225 takes precedence
• CPC Class Codes: A61L 15/42 Use of materials characterised by their function or physical properties liquid bandages A61L26/00
• CPC Class Codes: A61L 15/48 Surfactants
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: Y02P 20/141 Feedstock
• CPC Class Codes: Y10T 428/2878 including addition polymer from unsaturated monomer
• CPC Class Codes: Y10T 442/69 Autogenously bonded nonwoven fabric
• CPC Class Codes: Y10T 442/692 Containing at least two chemically different strand or fiber materials
• CPC Class Codes: Y10T 442/696 Including strand or fiber material which is stated to have specific attributes [e.g., heat or fire resistance, chemical or solvent resistance, high absorption for aqueous compositions, water solubility, heat shrinkability, etc.]

Abstract

A nonwoven disposable article is constructed using adhesive compositions containing 1 to 25% of a surfactant, which causes the adhesive composition to exhibit a contact angle of 90° or less and a reduction in surface tension of less than or equal to about 35-40 dynes/cm, giving improved wicking capabilities to the nonwoven.

Claims

1. A disposable article containing an absorbent core bound together or reinforced with hot melt adhesive fibers consisting of (a) 10 to 80 weight percent of an olefin containing polymer, (b) 10 to 70 weight percent of a compatible tackifying resin, c) 0 to 20% plasticizer, (d) 0 to 2% stabilizer, (e) 0 to 25% wax, and (f) 1 to 25% of a surfactant, which surfactant will cause the adhesive composition to exhibit a contact angle of 90°

or less and a reduction in surface tension of less than about 40 dynes/cm.

2. The disposable article according to claim 1 in which the surfactant is an ethoxylate of C₁ -C₁₈ alkyl or dialkyl phenol;

an ethoxylate of an alkyl C₈ -C₆₀ mono-alcohol;

an ethylene oxide/propylene oxide block copolymer having a Mn of 200 to 3000;

a benzoate formed by partial condensation of benzoic acid with a hydrophilic di- or mono-ol having less than 1000 Mn;

a C₈ -C₆₀ alkyl ethoxylate sulfonate;

an alkyl C₈ -C₆₀ sulfonate;

an alkyl/aromatic sulfonate;

or an ethoxylate or propoxylate of polydimethyl siloxane having a number average molecular weight of 500 to 10,000.

3. The disposable article according to claim 1 in which the surfactant is a crystallizable surfactant.

4. The disposable article according to claim 1 in which the olefin containing polymer is present in an amount of 40 to 60 weight percent.

5. The disposable article according to claim 1 in which the tackifying resin is present in an amount of 30 to 60 weight percent.