Soft, flexible composition and method for making same

• US 5,986,000 A
• Filed: 10/24/1995
• Issued: 11/16/1999
• Est. Priority Date: 05/22/1995
• Status: Expired due to Term

• Current Assignee: Playtex Products Incorporated (Edgewell Personal Care Company)
• Original Assignee: Playtex Products Incorporated (Edgewell Personal Care Company)
• Inventors: Williams, Karla E., Zwick, Paul D.
• Primary Examiner(s): Warzel, Mark L.
• Application Number:
  US08/547,766
• Time in Patent Office: 1,484 Days
• Field of Search: 604/11, 604/12, 604/14, 604/15, 604/904, 525/88, 525/89, 525/240, 428/35.7, 428/36.9
• US Class Current: 525/88
• CPC Class Codes: A61F 13/26 Means for inserting tampons , i.e. applicators
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: Y10S 604/904 Tampons
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/139 Open-ended, self-supporting conduit, cylinder, or tube-type article

Abstract

There is provided a composition comprising a unique polymeric compound that provides a soft, flexible product. There is also provided a unique polymeric tampon applicator that is soft and flexible. When used as a tampon applicator barrel, the barrel is more comfortable and has improved ease of insertion. The polymeric compound primarily comprises a thermoplastic resin and a block copolymer that exhibit unique load, energy and modulus of elasticity properties. The polymeric compound should also include a plasticizer and a compatibilizer/flow modifier, and may include a slip/mold release agent, an antioxidant, and even a pigment. There is also provided a method for making the polymeric compound that will be formed into a product, such as an applicator or applicator barrel in which all of the above ingredients, except for the thermoplastic resin, are combined and formed into soft pellets. The soft resin pellets are then dry blended with pellets of the thermoplastic resin. The mixture of the thermoplastic resin pellets and the soft resin pellets are then melted and injection molded into the desired shape. There is thus provided a method of making a soft, polymeric tampon applicator or tampon applicator barrel.

Claims

1. A tampon applicator barrel, adapted to accept a plunger, said tampon applicator barrel having an outside diameter about 0.67 inches and a wall thickness about 0.027 inches, comprising:

a thermoplastic resin; and

a thermoplastic elastomer in an amount sufficient to adjust elasticity so that the modulus of elasticity is about 104 psi.

3. The tampon applicator barrel of claim 1, wherein said thermoplastic elastomer is sufficient to adjust the energy needed to compress the tampon applicator barrel by 0.25 inches to less than 0.26 lbs.-inch.

5. The tampon applicator barrel of claim 1, wherein said thermoplastic elastomer is sufficient to adjust the supportable load of the tampon applicator to less than 2.06 lbs.

2. A tampon applicator barrel, adapted to accept a plunger, said tampon applicator barrel having an outside diameter about 0.60 inches and a wall thickness about 0.027 inches, comprising:

a thermoplastic resin; and

a thermoplastic elastomer in an amount sufficient to adjust elasticity so that the modulus of elasticity of the tampon applicator barrel is less than about 104 psi.

4. The tampon applicator barrel of claim 2, wherein said thermoplastic elastomer is sufficient to adjust the energy needed to compress the tampon applicator barrel by 0.25 inches to about 0.22 lbs.-inch.

6. The tampon applicator barrel of claim 2, wherein the supportable load of the tampon applicator is about 1.74 lbs.

7. A tampon applicator barrel, adapted to accept a plunger, said tampon applicator barrel having an outside diameter about 0.56 inches and a wall thickness about 0.027 inches, comprising:

a thermoplastic resin; and

a thermoplastic elastomer in an amount sufficient to adjust elasticity so that the modulus of elasticity of the tampon applicator barrel is less than 211 psi.

8. The tampon applicator barrel of claim 7, wherein the modulus of elasticity is about 113 psi.

9. The tampon applicator barrel of claim 7, wherein said thermoplastic elastomer is sufficient to adjust the energy needed to compress the tampon applicator barrel by 0.25 inches to less than 0.36 lbs.-inch.

10. The tampon applicator barrel of claim 9, wherein the energy needed to compress the tampon applicator barrel by 0.25 inches is about 0.25 lbs.-inch.

11. The tampon applicator barrel of claim 7, wherein said thermoplastic elastomer is sufficient to adjust the supportable load of the tampon applicator barrel to less than 2.83 lbs.

12. The tampon applicator barrel of claim 11, wherein said thermoplastic elastomer is sufficient to adjust the supportable load of the tampon applicator barrel to about 1.96 lbs.