Wet wipes containing a mono alkyl phosphate

Details Wet wipes containing a mono alkyl phosphate Wet wipes containing a mono alkyl phosphate

1999-12-16

2004-01-06

Criares, Theodore J. (Department: 1662)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Wearing apparel, fabric, or cloth

C424S722000, C514S109000, C514S141000

Reexamination Certificate

active

06673358

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to fibrous sheet materials which are premoistened with a solution for improved cleansing without excessive skin irritation. The invention particularly concerns wet wipes, such as baby wipes, which include a mono alkyl phosphate.
2. Description of the Related Art
Wet wipes are well known commercial consumer products which have been available in many forms. Perhaps the most common form of wet wipes has been a stack of moistened sheets which have been packaged in a plastic container. The wet wipes have been made from a variety of materials which have been moistened with a variety of suitable wiping solutions. Typically, the wet wipes have been available in either folded or unfolded configurations. For example, stacks of wet wipes have been available wherein each of the wet wipes in the stack has been arranged in a folded configuration such as a c-folded, z-folded or quarter-folded configuration as are well known to those skilled in the art. Each folded wet wipe has also been interfolded with the wet wipes immediately above and below in the stack of wet wipes. In an alternative configuration, the wet wipes have been in the form of continuous webs of material which include perforations to separate the individual wet wipes and which are wound into rolls and packaged in plastic containers. Such wet wipes have been used for baby wipes, hand wipes, household cleaning wipes, industrial wipes and the like.
The solutions incorporated into conventional wet wipes have usually included a number of ingredients intended to enhance or impart particular properties to the wipe. These properties have related to, for example, cleaning efficacy, fragrance, medication, reduced irritation, skin health, aesthetics of the product and the like. For baby wipes in particular, a solution providing a gentle soothing feeling without excessive irritation or foam while maintaining cleaning and antimicrobial efficacy is highly desirable for product performance. Suitable ingredients used to provide such properties have included water, emollients, surfactants, preservatives, chelating agents, pH buffers or combinations thereof. The solutions have also contained lotions and/or medicaments.
However, the conventional solutions and, in particular, the surfactants in such solutions for wet wipes have not been completely satisfactory. For example, to reduce the level of skin irritation, conventional wet wipe solutions have included amphoteric surfactants which generally cause little or no skin irritation. Such amphoteric surfactants have included sodium cocoamphoacetate and disodium cocoamphodiacetate. However, such amphoteric surfactants have typically not exhibited the high levels of cleaning efficacy associated with other surfactants such as anionic surfactants. Such amphoteric surfactants typically have also not provided the optimum silky feeling to the skin which is desired by consumers.
On the other hand, anionic surfactants, while exhibiting such cleaning efficacy, have generally caused excessive skin irritation such as dryness and scaling and, as a result, have not been suitable for use in wet wipe applications. The high level of skin irritation caused by such surfactants is particularly undesirable in baby wipe applications due to the tenderness of the infants skin. Moreover, most anionic surfactants are suitable for detergent compositions due to their high levels of foaming and detersive activity. However, such foaming is generally undesirable in wet wipe applications and, in particular, in baby wipe applications. Consumers who use wet wipes prefer that the solution from the wet wipes not leave any soapy or bubbly residue on the surface of the skin since the solution is usually not wiped off the skin after the wet wipe is used.
Accordingly, it remains desirable to provide solutions for wet wipes which include surfactants which exhibit improved cleaning efficacy while not causing excessive skin irritation or foaming.
SUMMARY OF THE INVENTION
In response to the difficulties and problems discussed above, new wet wipes which have improved solutions have been discovered.
In one aspect, the present invention relates to a wet wipe which includes a fibrous sheet material and a solution which includes from about 0.01 to about 10 weight percent based on a total weight of the solution of a phosphate ester surfactant. The phosphate ester surfactant includes a mono alkyl phosphate having the following structural formula:
wherein R represents a saturated or unsaturated hydrocarbon group having an average of from 8 to 22 carbon atoms, x represents a number of 0 to 20, and each of Y and Z represents hydrogen, an alkali metal, ammonium or an alkanol amine.
In another aspect, the present invention relates to a wet wipe comprising a fibrous sheet material and a solution which includes from about 0.01 to about 10 weight percent based on a total weight of the solution of a phosphate ester surfactant. The phosphate ester surfactant includes from about 50 to about 100 weight percent of a mono alkyl phosphate having the following structural formula:
and from about 0 to about 50 weight percent of a dialkyl phosphate having the following structural formula:
wherein R represents a saturated or unsaturated hydrocarbon group having an average of from 8 to 22 carbon atoms, x represents a number of 0 to 20, and each of Y and Z represents hydrogen, an alkali metal, ammonium or an alkanol amine.
In yet another aspect, the present invention relates to a wet wipe which includes a fibrous sheet material and a solution. The solution includes from about 0.01 to about 10 weight percent based on a total weight of the solution of a phosphate ester surfactant which includes a mono alkyl phosphate having the following structural formula:
wherein R represents a saturated or unsaturated hydrocarbon group having an average of from 8 to 22 carbon atoms, x represents a number of 0 to 20, and each of Y and Z represents hydrogen, an alkali metal, ammonium or an alkanol amine. The solution further includes from about 0.01 to about 5.0 weight percent based on a total weight of the solution of a diethanolamide.
The present invention, in its various aspects, advantageously relates to wet wipes which, when compared to conventional wet wipes, have improved cleaning efficacy without excessive skin irritation or foaming. Moreover, the present invention provides solutions for wet wipes which leave a lubricious, silky feeling to the skin during after application.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to fibrous materials and, in particular, wet wipes which have improved cleaning efficacy without, excessive skin irritation or foaming. The wet wipes of the present invention can be used for baby wipes, hand wipes, face wipes, cosmetic wipes, household wipes, industrial wipes and the like. Such wet wipes are generally folded and arranged in a stacked configuration inside a suitable container for consumer sale.
Materials suitable for such wet wipes are well known to those skilled in the art. The wet wipes are typically made from fibrous sheet materials which may be woven or nonwoven. For example, the wet wipes of the present invention may include nonwoven fibrous sheet materials which include meltblown, coform, air-laid, bonded-carded web materials, hydroentangled materials, combinations thereof and the like. Such materials can comprise synthetic or natural fibers or combinations thereof. Typically, the wet wipes define a basis weight of from about 25 to about 120 grams per square meter and desirably from about 40 to about 90 grams per square meter.
In a particular aspect, the wet wipes of the present invention comprise a coform basesheet of polymeric microfibers and cellulosic fibers having a basis weight of from about 60 to about 80 grams per square meter and desirably about 75 grams per square meter. Such coform basesheets are manufactured generally as described in U.S. Pat. No. 4,100,324 to Anderson et al. which issued Jul. 11, 1978, and which is herein

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