side) wetted and thus provides the full signal intended. This can be accomplished by providing a wetness indicator composition that has an optimized "open time" such it is tacky enough, during its incorporation into an absorbent article, for a long enough time to adhere to the substrate, but not so long that it bleeds through the substrate. 

Overall, there remains a need for a wetness indicator composition that is stable in the presence of challenging diaper designs, particularly those designs comprising: absor› bent cores that are substantially cellulose free and compris- ing high levels of adhesive (including, thermoplastic adhe› sive material) and absorbent polymer material, lower basis weight dusting layers and backsheets, and dusting layers and/or core covers coated with surfactants. Particularly, there is a need for more acidic wetness indicator composi- tions that comprise less phosphorus and/or nitrogen (which correlates to greater colorant stability while still providing acceptable color changing kinetics and retention). Addition› ally, there is a need for a wetness indicator composition that has an optimized "open time" for use in absorbent articles comprising lower basis weight and breathable films and nonwovens. 

An absorbent article of the present invention may com› prise a backsheet, a wetness indicator composition, and an absorbent core. The wetness indicator composition may comprise a stabilizer, a colorant, and a matrix. The absorbent core may comprise a nonwoven layer and an absorbent polymer material, and optionally, a thermoplastic adhesive material. The wetness indicator composition may be in direct contact with an inner surface of the backsheet and an outer surface of the nonwoven layer. And, the absorbent polymer material, and optionally, the thermoplastic adhesive material, may be in direct contact with an inner surface of the nonwoven. Further, the absorbent core may be substan› tially cellulose free and may be oriented in at least one row. 

## BRIEF DESCRIPTION OF THE DRAWINGS 

FIG. 1 is a partial longitudinal cross sectional view of an absorbent core ( comprising a nonwoven layer and a complex of absorbent polymer material and thermoplastic adhesive material) in accordance with an embodiment of the present invention. 

It should be understood that every limit given throughout this specification will include every lower, or higher limit, as the case may be, as if such lower or higher limit was expressly written herein. Every range given throughout this specification will include every narrower range that falls within such broader range, as if such narrower ranges were all expressly written herein. 

All percentages, ratios and proportions are by weight, and all temperatures are in degrees Celsius (° C.), unless other› wise specified. All measurements are in SI units unless otherwise specified. 

"Absorbent article" refers to devices that absorb and contain body exudates, and, more specifically, refers to devices that are placed against or in proximity to the body of the wearer to absorb and contain the various exudates discharged from the body. Absorbent articles may include diapers, training pants, adult incontinence undergarments, 

## SUMMARY OF THE INVENTION 

## DETAILED DESCRIPTION OF THE INVENTION 

feminine hygiene products, breast pads, care mats, bibs, wound dressing products, and the like. As used herein, the term "body fluids" or "body exudates" includes, but is not limited to, urine, blood, vaginal discharges, breast milk, sweat and fecal matter. 

"Absorbent core" means a structure typically disposed between a top sheet and backsheet of an absorbent article for absorbing and containing liquid received by the absorbent article and may comprise one or more substrates, absorbent polymer material disposed on the one or more substrates, and a thermoplastic composition on the absorbent particulate polymer material and at least a portion of the one or more substrates for immobilizing the absorbent particulate poly› mer material on the one or more substrates. In a multilayer absorbent core, the absorbent core may also include a cover layer. The one or more substrates and the cover layer may comprise a nonwoven. Further, the absorbent core is sub› stantially cellulose free. The absorbent core does not include an acquisition system, a topsheet, or a backsheet of the absorbent article. In a certain embodiment, the absorbent core would consist essentially of the one or more substrates, the absorbent polymer material, the thermoplastic compo› sition, and optionally the cover layer. Absorbent cores that may be used in the present invention are disclosed in US Pub. Nos. 2004/0162536 to Becker filed on Feb. 11, 2004; 2007/0167928 to Becker filed on Mar. 13, 2007; 2007/ 0179464 to Becker filed on Mar. 13, 2007; 2007/0156108 to Becker filed on Mar. 13, 2007; and 2004/0167486 to Busam filed on Feb. 11, 2004; U.S. Ser. No. 60/936,102 to Hundorf filed on Jun. 18, 2007; 60/936,109 to Hundorf filed on Jun. 18, 2007; 60/936,149 to Hundorf filed on Jun. 18, 2007; 60/936,085 to Ashton filed on Jun. 18, 2007; 60/936,084 to Ashton filed on Jun. 18, 2007; 60/936, 150 to Ashton filed on Jun. 18, 2007; 60/936,146 to Asthon filed on Jun. 18, 2007; 60/936,037 to Ashton filed on Jun. 18, 2007; and 61/091,799 to Hundorf filed on Aug. 26, 2008. 

"Absorbent polymer material," "absorbent gelling mate› rial," "AGM," "superabsorbent," and "superabsorbent mate› rial" are used herein interchangeably and refer to cross linked polymeric materials that can absorb at least 5 times their weight of an aqueous 0.9% saline solution as measured using the Centrifuge Retention Capacity test (Edana 441.2- 01). 

"Airfelt" is used herein to refer to comminuted wood pulp, which is a form of cellulosic fiber. 

"Comprise," "comprising," and "comprises" are open ended terms, each specifies the presence of what follows, e.g., a component, but does not preclude the presence of other features, e.g., elements, steps, components known in the art, or disclosed herein. 

"Consisting essentially of’ is used herein to limit the scope of subject matter, such as that in a claim, to the specified materials or steps and those that do not materially affect the basic and novel characteristics of the subject matter. 

"Diaper" refers to an absorbent article generally worn by infants and incontinent persons about the lower torso so as to encircle the waist and legs of the wearer and that is specifically adapted to receive and contain urinary and fecal waste. As used herein, term "diaper" also includes "pants" which is defined below. 

"Fiber" and "filament" are used interchangeably. 

A "nonwoven" is a manufactured sheet, web, or batt of directionally or randomly orientated fibers, bonded by fric- tion, and/or cohesion and/or adhesion, excluding paper and products which are woven, knitted, tufted, stitch-bonded incorporating binding yarns or filaments, or felted by wet- 

