Insect repellent article providing low contact wetness

• US 6,162,454 A
• Filed: 08/07/1996
• Issued: 12/19/2000
• Est. Priority Date: 03/08/1996
• Status: Expired due to Fees

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Marin, Anna Belle, Godfroid, Robert Allen, Ahr, Nicholas Albert
• Primary Examiner(s): Levy, Neil S.
• Application Number:
  US08/691,197
• Time in Patent Office: 1,595 Days
• Field of Search: 428/321.1, 428/314.2, 428/314.4, 428/315.5, 428/315.7, 428/315.9, 428/905, 428/134, 428/136, 424/402-404, 424/410, 424/416, 424/443, 424/447-449, 424/DIG. 7, 424/76.2-76.4, 424/76.8, 514/918-920
• US Class Current: 424/411
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 25/18 Vapour or smoke emitting compositions with delayed or sustained release
• CPC Class Codes: A01N 31/06 Oxygen or sulfur directly attached to a cycloaliphatic ring system
• CPC Class Codes: A61L 9/127 comprising a wick

Abstract

The present invention provides a portable, disposable article for repelling insects. The article includes a fibrous substrate which can be impregnated with the insect repellent. In one embodiment, the fibrous substrate is disposed intermediate a porous cover and a barrier layer, and comprises fibers having external capillary channels. The porous cover can comprise an apertured plastic film having tapered apertures. The insect repellent can be contained in a breakable packet, such that when the breakable packet is broken, the insect repellent is directed through the fibrous substrate for release through the apertured film.

Claims

1. A portable, disposable article for providing release of a volatile liquid material from a release surface of the article, the article comprising a porous cover layer, wherein the cover layer comprises a formed film having a plurality of three-dimensionally formed tapered apertures, the cover layer covering a substrate impregnated with the volatile liquid material, wherein the volatile liquid material is selected from the group consisting of citronellol, citronellal, citronellyl nitrile, para-Isopropylcyclohexanol, 3,7-dimethyl-2,6-Octadien-1-al, 5,9-dimethyl-4,8-decadienal, p-Mentha-1,8-diene, o-methyl betarhenylethyl alcohol, 4-Cyclooctenyl methyl carbonate, ethyl butylacetylaminopropionate, dimethyl phthalate, thyme oil red, gamma methyl ionone, beta phenylethyl alcohol, clove bud oil, and mixtures thereof.

2. The portable disposable article of claim 1 wherein the release surface has a contact wetness of less than about 50 mg.

3. The portable disposable article of claim 2 wherein the release surface has a contact wetness of less than about 25 mg.

4. The portable disposable article of claim 1 wherein the release surface has a normalized contact wetness of less than about 100 mg/gram.

5. The portable disposable article of claim 4 wherein the release surface has a normalized contact wetness of less than about 25 mg/gram.

6. The portable disposable article of claim 1 wherein the article has a normalized release rate of at least about 0.25.

7. The article of claim 6 wherein the article has a normalized release rate of at least about 0.40.

8. The article of claim 7 wherein the article has a normalized release rate of at least about 0.50.

9. The article of claim 1 wherein the article has a substrate impregnated about 2.0 grams or less of the volatile liquid material.

10. The article of claim 9 wherein the ratio of the weight of the volatile liquid material to the weight of the substrate is at least about 2.0.

11. The article of claim 1 wherein the article has a maximum caliper no greater than about 3.0 mm.

12. A portable, disposable article for providing release of a volatile liquid material, the article comprising:

a porous cover layer wherein the cover layer comprises a formed film having a plurality of tapered apertures for providing release of the volatile liquid material from the article,

wherein the porous cover layer has an open area ratio of at least about 20 percent, and

wherein the porous cover layer has a contact wetness of less than about 100 mg;

a barrier layer, the barrier layer being generally impervious to the volatile liquid material; and

a substrate impregnated with the volatile liquid material, wherein at least a portion of the substrate is disposed intermediate the porous cover layer and the barrier layer.

23. The article of claim 12 wherein the porous cover layer has an open area ratio of at least about 30 percent, and wherein the porous cover layer has a contact wetness of less than about 50 mg.

24. The article of claim 12 wherein the article comprises no more than about 2.0 grams of the volatile liquid material, and wherein the article has a normalized release rate of at least about 0.40.

25. The article of claim 23 wherein the ratio of the weight of the volatile liquid material to the weight of the substrate is at least about 2.0.

13. A portable, disposable article for providing controlled release of a volatile liquid material, the article comprising:

a substance impregnated with a volatile liquid material selected from the group consisting of citronellol, citronellyl nitrile, 3,7-dimethyl-2,6-Octadien-1-al, 5,9-dimethyl-4,8-decadienal, p-Mentha-1,8-diene, o-methyl betaphenylethyl alcohol, 4-Cyclooctenyl methyl carbonate, ethyl butylacetylaminoproiionate, dimethyl phthalate, thyme oil red, gamma methyl ionone, beta phenylethyl alcohol, clove bud oil, and mixtures thereof; and

a liquid impermeable porous cover layer for providing release of the volatile liquid material from the article; and

wherein the article has a normalized release rate of at least about 0.25, and wherein the porous cover layer has a contact wetness of less than about 100 mg.

14. The article of claim 13 wherein the porous cover layer has a contact wetness of less than about 50 mg.

15. The article of claim 14 wherein the release surface has a normalized contact wetness of less than about 25 mg/gram.

16. The article of claim 13 wherein the porous cover layer has an opening area ratio of at least about 20 percent.

17. The article of claim 16 wherein the porous cover layer has an opening area ratio of at least about 30 percent.

18. The article of claim 13 wherein the porous cover layer has a caliper of at least. about 0.015 inch.

19. The article of claim 18 wherein the porous cover layer has a caliper of at least about 0.050 inch.

20. The article of claim 13 wherein the article has a substrate impregnated with about 2.0 grams or less of the volatile liquid material.

21. The article of claim 20 wherein the ratio of the weight of the volatile liquid material to the weight of the substrate is at least about 2.0.

22. The article of claim 13 wherein the article has a maximum caliper no greater than about 3.0 millimeter.