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US 12,245,922 B2Granted
Wetness indicator free from halogen-containing species
AssigneeBostik SA
InventorsKimberly E. Secrist, Neil G. Janetski
Life of this patent
Estimating the term…
Abstract
A hot melt wetness indicator comprising an adhesive base composition utilizing a halogen-free species, namely nitrazine yellow, to trigger color change in hygiene articles, such as disposable diapers, to serve as moisture or wetness indicator upon insult. In some embodiments of the invention, the wetness indicator turns from yellow to purple.
Claims21
A hot melt wetness indicator composition comprising:
- about 10 to about 80% by weight of a base polymer, wherein the base polymer comprises polyethylene glycol in an amount of at least 10% by weight;
- about 15 to about 75% by weight of a tackifier;
- a pH adjuster in an amount sufficient to cause the pH of the composition to be less than 6;
- and
- about 0.01 to about 5% by weight of a pH indicating agent consisting of nitrazine yellow, wherein the composition does not comprise a permanent dye.
2 more elements
A hot melt wetness indicator composition comprising:
- about 1 to about 80% by weight of a base polymer, wherein said base polymer is selected from the group consisting of ethylene-vinyl-acetate (EVA), styrene-isoprene-styrene (SIS) block copolymer, styrene-butadiene-styrene (SBS) block copolymer, styrene-ethylene-butylene-styrene (SEBS) block copolymer, styrene-ethylene/ethylene-propylene-styrene (SEEPS) block copolymer, high density polyethylene, low density polyethylene, chemically modified polyethylene, sulfonated polyesters, polyvinylpyrrolidone, polyvinylpyrrolidone/vinyl acetate copolymer, amorphous polyalphaolefins, ethylene/styrene interpolymers (ESI), metallocene catalyzed APAOs, and polyvinyl methyl ether, and mixtures thereof;
- about 15 to about 75% by weight of a tackifier;
- a pH adjuster in an amount sufficient to cause the pH of the composition to be less than 6;
- and
- about 0.01 to about 5% by weight of a pH indicating agent consisting of nitrazine yellow, wherein the composition does not comprise a permanent dye.
2 more elements
A hygiene article comprising:
- a fluid-impervious back sheet having an inner surface, a nonwoven top sheet, and an absorbent core disposed between the back sheet and the top sheet;
- and
- a hot melt wetness indicator bonded to the inner surface of the back sheet and in contact with the absorbent core such that, upon insult of the absorbent core with urine, the urine contacts the hot melt wetness indicator, wherein the hot melt wetness indicator comprises:
- about 10 to about 80% by weight of a base polymer, wherein the base polymer comprises polyethylene glycol in an amount of at least 10% by weight;
- about 15 to about 75% by weight of a tackifier;
- a pH adjuster in an amount sufficient to cause the pH of the indicator to be less than 6;
- and
- about 0.01 to about 5% by weight of a pH indicating agent consisting of nitrazine yellow, wherein the hot melt wetness indicator does not comprise a permanent dye.
5 more elements
Dependencies are inferred from the claim text.