CN1223571A - Cleaning articles treated with a high internal phase inverse emulsion - Google Patents

Abstract

The present invention discloses cleansing articles, particularly wet-like cleansing wipes, which are particularly useful for cleaning hard surfaces, and for personal cleansing such as baby wipes, especially for removing dirt around the anus. Said such preparations comprise: a carrier, and an emulsion applied to the carrier. The emulsion comprises: (1) about 2-60% of a continuous solid lipid phase comprising a waxy material with an alkane point of about 30°C or higher; (2) about 39-97% dispersed in an internal polar phase (e.g., water) in the lipid phase; (3) an effective amount of a non-silicone-containing emulsifier, wherein the emulsifier has a viscosity of greater than about 500 centipoise at 55°C; and (4) at An optional secondary emulsifier having a viscosity of less than about 400 centipoise at 55°C. Since the emulsion contains a waxy outer phase, the inner polar phase will remain within the emulsion until the shear stress during use breaks the emulsion, thereby providing the desired moisture for cleaning. The invention also relates to a process for the preparation of such cleaning articles.

Description

Cleansing articles treated with high internal phase inverse emulsions

This application is a continuation-in-part of co-pending US Patent Application Serial No. 08/640,268 filed April 30, 1996 by L. N. Macky et al.

technical field

The present invention relates to articles that are dry until use, but become wet during use, useful as wipes. In particular, the present invention relates to wet-like cleaning wipes made from a carrier treated with a high internal phase inverse emulsion comprising a continuous lipidic external phase and a polar internal phase. The wipes are useful for a variety of purposes including hard surface cleaning and personal cleansing such as baby wipes, especially for removing perianal feces.

Background of the invention

Clean skin is a personal hygiene problem that is not always easy to solve. Of course, the usual method of washing your skin with soap and water is pretty good, but sometimes it's not readily available or inconvenient to use. Although soap and water can be used, for example, to wash the perianal area after defecation, the described method is too cumbersome. Thus, dry tissue paper products are the most commonly used post-poo anal cleansing products in developed countries. These dry tissue paper products are commonly referred to as "toilet paper".

The perianal skin is characterized by fine wrinkles and grooves and the presence of hair follicles; this makes the perianal area one of many difficult anatomies to clean. During defecation, feces are expelled from the anus and often accumulate firmly in places such as around hair roots and in grooves on the surface of the skin. As the feces will become dehydrated when exposed to the air, or in contact with absorbent cleaning implements such as toilet paper, the feces will adhere more firmly to the skin and hair, thus making subsequent removal of the remaining dehydrated stool more difficult.

Failure to remove feces from the perianal area would create a detrimental use of personal hygiene. Feces left on the skin after bowel cleansing are high in bacteria and viruses, are malodorous and often dehydrated. These properties will increase the likelihood of perianal discomfort and discomfort (eg, itching, irritation, chafing, etc.). In addition, the remaining feces will stain the underwear and cause unpleasant odors to spread from the anal area. Therefore, it is clear that inappropriate perianal cleansing would be undesirable.

For individuals suffering from anal discomfort such as anal itching, hemorrhoids, fissures, cryptitis, etc., an adequate cleansing around the anus is of great importance. Perianal discomfort is often characterized by an opening in the skin through which bacteria and viruses from residual feces can easily enter. Thus, people suffering from anal discomfort must perform a thorough wash around the anus after defecating, or risk the same result, that their discomfort will be exacerbated by bacteria and viruses left on the skin.

At the same time, those with anal discomfort face the more serious consequences of less satisfactory bowel clearance due to inadequate post-washing. Those with anal discomfort will often have the perianal area extremely sensitive and attempting to remove feces from the area by wiping with normal wiping pressure will cause pain and further irritate the skin. Attempts to improve stool removal with increased wiping pressure will make the skin more painful. Conversely, attempting to minimize discomfort by reducing the wiping pressure will increase the amount of residual feces left on the skin.

Conventional toilet paper products for anal cleansing are essentially dry, low density toilet paper that rely solely on mechanical processes to remove feces from the perianal skin. These conventional products generally wipe against the perianal skin using about 1 psi (7 kilopascals) of pressure and substantially wipe the feces from the skin. Since the wiping process overcomes the soil-to-soil cohesion present in the discharged feces, after the first few wipes, the upper portion of the soil layer will be removed. Thus, the dirt layer itself will split, wherein the upper part of the fecal layer will be removed, while the lower part of the dirt will still stick to the skin around the anus.

Regular tissue products are absorbent, and with each successive wipe, the waste will be further dehydrated, making it more firmly bonded to the skin and hair around the anus and making it harder to remove . When a tissue product is rubbed firmly against the perianal area, more waste will be removed, but will cause severe pain for those suffering from anal discomfort, and will even scratch the normal perianal skin, potentially causing irritation , inflammation, pain, bleeding, and infection.

To improve perianal cleansing, wipes have been developed that remain with the dispenser, usually soaked in a container of moistening fluid. Examples of such products include wipes, which are often used to clean babies after a bowel movement and may contain other additives in the moisturiser to lubricate the skin. These wipes have permanent wet strength and as a result, they are not rinseable. Additionally, these prior wipes were often too wet to keep the skin dry and often had a "cold" feel. Plus, it lacks consistency in terms of moisture content per wipe.

Wettable dry tissue products have been used for perianal cleansing. These wettable tissue products generally have a temporary wet strength such that they are flushable. However, it is inconvenient for the user of these products to have to moisten the tissue paper separately. In addition, with the described products it is very difficult to obtain the desired moisture content. Furthermore, the temporary wet strength of the products is often insufficient and needs to be improved.

Accordingly, it would be desirable to provide cleansing products, particularly personal cleansing products, wherein the product: (1) has a constant volume of wetting fluid; (2) has moderate temporary wetness to enable rinsing; content so as to provide effective cleaning; and (4) remain substantially dry until used for cleaning.

Summary of the invention

The present invention relates to articles for cleaning, particularly to wet-like cleaning wipes, primarily for hard surface cleaning, and for personal cleansing such as baby wipes, especially for removing perianal soils. These articles include:

a. carrier; and

b. an emulsion applied to the carrier, the emulsion comprising:

(1) from about 2 to about 60%, a continuous, solidified, external lipid phase comprising a waxy lipid material having a melting point of about 30° C. or higher;

(2) from about 39% to about 97% of the inner polar phase dispersed in the outer lipid phase;

(3) an effective amount of a non-silicone-containing emulsifier capable of forming an emulsion when the external lipid phase is fluid, wherein the emulsifier has a viscosity of greater than about 500 centipoise at 55°C; and

(4) An optional second emulsifier preferably having a lower viscosity than the first emulsifier.

In addition, the invention also relates to methods for the preparation of these articles. The method comprises the steps of:

A． forming an emulsion comprising:

(1) from about 2 to about 60%, a continuous, solidified, external lipid phase comprising a waxy lipid material having a melting point of about 30° C. or higher;

(2) from about 39% to about 97% of the inner polar phase dispersed in the outer lipid phase;

(3) an effective amount of a non-silicone-containing emulsifier capable of forming an emulsion when the external lipid phase is fluid, wherein the emulsifier has a viscosity of greater than about 500 centipoise at 55°C; and

(4) An optional second emulsifier preferably having a lower viscosity than the first emulsifier.

B． applying the emulsion to the carrier at a temperature high enough to provide the outer lipid phase with a fluid or plastic consistency;

C． The applied emulsion is cooled to a temperature low enough for the outer fatty phase to solidify.

The articles of the present invention have a number of distinct advantages over previous cleansing products, especially when used in the form of wet-like cleansing wipes to remove perianal soils, or when used as baby wipes. During more comfortable, effective cleaning, these articles will release a substantial amount of internal polar phase components (such as preferably water and aqueous solutions). The continuous lipid phase of the emulsion is sufficiently brittle so that it is easily broken up by low shear contact (such as during rubbing of the skin) to easily release the internal polar phase, but is extremely strong during harsh processing Tough, thus avoiding the premature release of the internal polar phase. In addition, the continuous lipid phase of these preparations is extremely stable during storage, preventing substantial evaporation of the internal polar phase. The normal tensile strength and flushability of these articles are not adversely affected when treated with the high internal phase inverse emulsions of the present invention. Thus, users of these articles will receive a comfortable, effective, moist clean without having to alter their normal cleaning habits.

Applicants have discovered that when used in the formulation of high internal phase emulsions relatively high viscosity, non-silicone containing emulsifiers provide advantages over other emulsifiers. Especially after being subjected to high shear processing conditions, these emulsifiers provide better internal phase retention than low viscosity emulsifiers, as well as silicone-containing emulsifiers described in co-pending US Patent Application No. 08/430,061 (filed April 27, 1995 by L. Mackey, docket No. 5653). This will be beneficial for applying the emulsion to the support, preferably using high shear dispersion.

In addition to perianal cleansing, the articles of the present invention can be used in many applications requiring delivery of polar fluids, such as water, and active agents dissolved or dispersed in polar fluids. These uses mentioned include: wipes for personal cleaning, such as baby wipes; hard surface cleaning for floors, countertops, sinks, bathtubs, toilets, etc.; and for delivering polar soluble or dispersible Various uses of antibacterial active agents or pharmaceutical active agents. These articles can also serve multiple functions. For example, a high internal phase inverse emulsion applied to a carrier can be formulated to provide both cleaning and waxing benefits when applied to articles such as furniture, shoes, automobiles, and the like.

Figure overview

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic flow diagram illustrating a spray system for applying the high internal phase inverse emulsion of the present invention to a support, such as a paper web.

Figure 2 illustrates a schematic flow diagram of a spray coating system for applying the high internal phase inverse emulsion of the present invention to a support such as a paper web by flexrotogravure coating.

Detailed description of the invention

The term "comprising" used in the present invention means that various components, ingredients, or steps can be used in combination when implementing the present invention. Thus, the term "comprising" includes the more restrictive terms "consisting essentially of" and "consisting of".

As used herein, the terms "detergent", "detersive surfactant" and "detersive surfactant" are used interchangeably and mean any substance that lowers the surface tension of water, especially concentrated at the oil-water interface , a surfactant that acts as an emulsion and thus helps remove dirt.

The term "polar" as used in the present invention refers to a molecule having a dipole moment, ie, a molecule in which the positive and negative charges are permanently separated compared to a non-polar molecule in which the charges overlap. A "polar fluid" may comprise one or more polar components.

The terms "substrate" and "layer" used in the present invention, when used to describe the carrier of the present invention, refer to a component whose principal dimension is X-Y, ie along its length and width. It should be understood that the terms substrate and layer need not be limited to a single substrate/layer, or sheet, of material. Thus, a substrate or layer may comprise a laminate or composite of several sheets or webs of a desired type of material. Thus, the term "substrate" includes "substrates of all kinds" and the term "layer" includes "layers of all kinds" and "layered layers".

All percentages, ratios and proportions used herein are by weight unless otherwise specified.

A． Carriers for High Internal Phase Inversion Emulsions

Various forms of vectors can be used in the present invention. The support includes a single substrate, or a plurality of substrates. The desired end use of the article will of course have an effect on the particular carrier employed.

The term "carrier" as used in the present invention includes woven materials, non-woven materials, foamed materials, sponges, battings, balls, puffs, films and the like. Particularly preferred substrates for use in the present invention are nonwoven-type materials. These nonwoven substrates include any conventional nonwoven sheet or web having suitable basis weight, caliper, absorbency, and strength characteristics. Nonwoven substrates may generally be referred to as reticulated, bonded, fibrous or filamentary products in which the fibers or filaments when "airlaid" or certain "wetlaid" Distributed randomly, or with some degree of orientation of the fibers or filaments when using certain "wet-laid" or "carded" processes. The fibers or filaments of the nonwoven substrate may be natural (e.g., wood pulp, wool, silk, jute, hemp, cotton, flax, sisal, or bluegrass) or synthetic (e.g., rayon, cellulose esters, polyvinyl derivatives, polyolefins, polyamides or polyesters) and can be bonded together using polymeric binder resins. Examples of suitable commercially available nonwoven substrates include those available under the tradenames Sontara( ^R) (Dupont) and Polyweb ^(R) (James River Corp.).

For reasons of cost, ease of manufacture, and ease of handling (e.g., flushability) of the article, preferred types of nonwoven substrates for use in the wipes of the present invention include those made from wood pulp fibers, i. those substrates. As indicated, the web can be prepared by air-laying or wet-laying. An airlaid web such as AirTex ^(R) SC130 available from James River Corp.

More conventionally, paper webs are made by wet-laying. In said process, a paper web is produced by forming an aqueous papermaking furnish, depositing said furnish on a porous surface such as a fourdrinier wire, and then removing water from the furnish such as by gravity dewatering, vacuum-assisted drying and and/or evaporative dewatering, with or without pressing, thereby forming a web of the desired fiber concentration. In many cases, papermaking equipment is configured so that the fibers in the papermaking furnish slurry are rearranged during dewatering to form a paper base having the desired strength, feel, bulk, appearance, absorbency, etc.

The papermaking furnish used to form the preferred paper base for the articles of the present invention consists essentially of an aqueous slurry of papermaking fibers (i.e. pulp) and may also contain a number of chemicals such as wet strength resins, surfactants, pH regulators, softening additives , to binding agents (debonding agents), etc. All types of wood pulp can be used to form paper furnish. Wood pulps useful in the present invention include sulfite and sulfate pulps, as well as mechanical, thermomechanical and chemithermomechanical pulps, all of which are known to those skilled in the art. Pulps obtained from deciduous or coniferous trees can be used. A preferred papermaking furnish for forming the preferred paper base for the wipes of the present invention comprises kraft pulp derived from northern softwood.

A number of papermaking processes have been developed which use papermaking equipment which forms a web having a particularly useful or desired fiber configuration. The topography may function to impart the properties to the web, such as enhanced bulk, absorbency and strength. One of these methods uses an embossing fabric during the papermaking process that will impart high density knuckle patterns and low density areas to the final web. This method, and the papermaking apparatus for carrying it out, are described in detail in US 3,301,746 (Sanford et al., issued January 31, 1967), which patent is incorporated herein by reference.

Another papermaking process uses a throughdrying fabric with knuckles raised above the plane of the fabric. These knuckles will create protrusions in the throughdried sheet and provide a sheet that is extensible in the cross direction. This method is described in EP publication 677,612A2 (published 1995.10.18, G. Wendt et al.), which is hereby incorporated by reference.

There is also a papermaking process carried out using specific papermaking equipment that provides a web of distinct, continuous web-like regions formed by a number of "circles" dispersed throughout the web-like region on the substrate. top" formed. The dome is formed by pressing the web formed during the papermaking process as it enters a perforated baffle with a patterned web-like surface consisting of many individual cells that are discontinuous in the surface of the baffle. Formed by baffle ducts. This method and the device for carrying out the method are described in detail in US4,529,480 (Trokhan, 1985.7.16 authorization); US4,637,859 (Trokhan, 1987.1.20 authorization); and US5,073,235 (Trokhan, 1991.12.17 authorization), These patent documents are incorporated herein by reference. Another papermaking process, and apparatus for carrying out the process (suitable for making layered composite paper bases) is described in US Pat. No. 3,994,771 (Morgan et al., issued Nov. 30, 1976), which is incorporated herein by reference.

Preferred paper bases form one of two or more layers that can be laminated together. Lamination for forming a plurality of protrusions in a laminated product, and lamination in conjunction with an embossing step, is described in detail in US 3,414,459 (Wells, 1968.12.3 issued), which is hereby incorporated by reference . These paper bases preferably have a basis weight of between about 10 g/ ^m2 and about 65 g/ ^m2 and a density of about 0.6 g/ ^cm3 or less. More preferably, the basis weight is about 40 g/ ^m2 or less and the density is about 0.3 g/cm3 or less. Most preferably, the density is between about 0.04 g/ ^cm3 and about 0.2 g/ ^cm3 . See US Pat. No. 5,059,282 (Ampulski et al., issued Oct. 22, 1991), column 13, lines 61-67, which describes how to measure the density of tissue paper. (Unless otherwise stated, all amounts and weights referring to the web base are on a dry basis).

The papermaking furnishes used to prepare these paper web bases may have added thereto other components or materials other than papermaking fibers, which materials are known or subsequently become known in the art. The type of additive desired will depend on the intended end use of the tissue paper. For example, in wipe products such as toilet paper, paper towels, facial tissue, baby wipes, and other similar products, high wet strength is a desirable property. Therefore, it is often desirable to add chemicals known in the art as "wet strength" resins to papermaking furnishes.

A general review of the types of wet strength resins used in the paper industry can be found in TAPPI (Association of Pulp and Paper Industries, New York) Monograph No. 29, "Wet Strength of Paper and Board". The most useful wet strength resins are generally cationic in character. For the development of permanent wet strength, polyamide-epichlorohydrin resins have been found to be particularly useful cationic wet strength resins. Suitable types of resins are described in US 3,700,623 (Keim, issued Oct. 24, 1972) and US 3,772,076 (Keim, issued Nov. 13, 1973), both of which are incorporated herein by reference. A useful commercially available polyamide-epichlorohydrin resin is Kymene ^(R) 557H (available from Hercules, Inc., Wilmington, Delaware).

It has also been found that polyacrylamide resins can also be used as wet strength resins. These resins are described in US 3,556,932 (Coscia et al., issued January 19, 1971) and 3,556,933 (Williams et al., issued January 19, 1971), both of which are incorporated herein by reference. A useful commercially available polyacrylamide resin is Parez ^(R) 631NC (available from American Cyanamid Co., Stamford, Connecticut).

Another class of water-soluble cationic resins which have also been found useful as wet strength resins are urea-formaldehyde and melamine-formaldehyde resins. The more common functional groups of these multifunctional resins are nitrogen-containing groups such as amino groups and methylol groups attached to nitrogen atoms. Polyethylenimine resins are also useful in the present invention. In addition, temporary wet strength resins such as Caldas 10 (manufactured by Japan Carlit), CoBond 1000 (manufactured by National Starch and Chemical Company) and Parez 750 (manufactured by American Cyanamide Co.) can be used in the present invention. It will be appreciated that the addition of compounds such as the wet strength resins and temporary wet strength resins described above to the pulp furnish is optional and not necessary for the practice of the present invention.

In addition to wet strength additives, it is also desirable to include certain dry strength additives and lint control additives known in the art in the papermaking fibers. In this regard, starch binders have been found to be particularly suitable additives. In addition to reducing the linting of the paper base, the low level of starch binder also provided a modest improvement in dry tensile strength without making the paper base stiff as a result of high starch additions. Starch binders are generally used in amounts of from about 0.01 to about 2 weight percent, preferably from about 0.1 to about 1 weight percent, based on the weight of the paper base.

Starch binders suitable for these paper bases are generally characterized by being water soluble and hydrophilic. While not intending to limit the range of suitable starch binders, representative starchy materials include corn starch and potato starch, with waxy corn starch known in the industry as amioca starch being particularly preferred. Amioca starch differs from common starch in that the starch is entirely amylopectin whereas normal corn starch contains both amylopectin and amylose. The different characteristics of Amioca starch are further described in "Amioca - The Starch From Waxy Corn," (H.H. Schopmeyer, Food Industries, December 1945, pp. 106-108 (Vol. pp. 1476-1478)).

The starch binder can be granular or dispersed, and granular is particularly preferred. Preferably the starch binder is fully cooked until the granules swell. More preferably, the starch granules are swollen, such as by cooking, to such an extent that the starch granules are about to disperse. Such highly swollen starch granules are referred to as "fully boiled". The conditions for dispersing will generally vary according to the size of the starch granules, the degree of crystallinity of the granules, and the amount of amylose present therein. For example, fully boiled amioca starch can be prepared by heating an aqueous slurry of starch granules at a concentration of about 4% at about 190°F (about 88°C) for about 30 to about 40 minutes. Other examples of starch binders that can be used include: modified cationic starches, such as those modified with nitrogen-containing groups, including amino groups and hydroxymethyl groups attached to nitrogen atoms, which are available from National Starch and Chemical Company (Bridgewater, New Jersey), which have previously been used as additives to pulp furnishes to increase wet and/or dry strength.

The carrier of the present invention also includes one or more polarphobic (preferably hydrophobic) regions. In a preferred embodiment, the carrier includes one or more hydrophobic regions, the hydrophobic regions of the carrier can be obtained by 1) treating the hydrophilic substrate with a water-repellent compound or 2) using a hydrophobic material such as a hydrophobic film or a hydrophobic fiber layer as a phase. Different layers are produced. A preferred design for these products would be a durable hydrophobic region that does not adversely affect the handle or softness of the carrier. Emulsion-treated supports comprising a hydrophobic region and an optional substrate are described in co-pending US Patent Application Serial No. 08/759,546 (filed December 5, 1996 by Gordon et al., P&G, Docket No. 6081R), and are referred to herein as This application is incorporated by reference.

When the hydrophobic regions are formed by treating the substrate, the hydrophobic material is applied to the substrate by conventional spraying, coating or printing processes and then cured by heat and/or a UV light source. Surfaces treated with hydrophobic materials are described, for example, in co-pending US08/442,935, filed May 31, 1995 by W. Ouellette et al. (case 5337R2), which is incorporated herein by reference. The resulting support is a substrate with at least one hydrophobic surface.

Many hydrophobic materials that can be deposited onto substrates such as nonwovens are known in the art and can be used in the present invention. Preferred examples include: the silicone material Syl-Off 7677 available from Dow Corning Company (Midland, Michigan) to which 100 parts by weight to 10 parts by weight of the crosslinker Sy1-Off 7048 is added, respectively. Another suitable surface treatment is a UV-curable polysiloxane coating comprising a blend of two polysiloxanes available from General Electric Company, Silicon Products Division (Waterford, NY), commercially available as The names are UV9300 and UV9380C-D1, and the weight ratios are 100 parts by weight to 2.5 parts by weight. Other suitable materials include, but are not limited to, fluorinated materials, such as fluoropolymers (eg, polytetrafluoroethylene (PTFE)), available under the tradename TEFLON( ^R) , and chlorofluoropolymers. Other materials suitable for use as the hydrophobic material are petrolatum, latex, paraffin, etc., but silicone materials are preferred. Other materials include the commercially available water repellents listed in McCutcheon's Volume 2: Functional Materials 1995, McCutcheon's Division, The Manufacturing Confectioner Publishing Co. (this publication is hereby incorporated by reference), of which GraphSize and Norgard 10-T available from Norman Fox & Co. The desired addition of the hydrophobic compound will depend on the substrate, but typically ranges from about 1% to about 10% by weight, based on the dry weight of the substrate layer.

The incorporation of the film or fibers to provide the optional hydrophobic regions can be accomplished by using any type of resin that can be extruded to form a hydrophobic film or fiber layer. Resins used to form hydrophobic films/fibers include, but are not limited to, polyolefins such as polyethylene or polypropylene, polyacrylics, polyamides, polystyrenes, polyurethanes, and the like. Most preferred are films or fibers derived from polyolefins, preferably polyethylene or polypropylene. Films or fibers can be used as a flat, sheet-like hydrophobic layer, and can also be bonded to the substrate by means of gluing, heat bonding, or pressure bonding.

Since softness is required in the wiping article for better cleaning, it is desirable to mechanically treat hydrophobic films in such a way as to make them softer. Ring rolling is an option for imparting more flexibility to the film. This process is described in detail in US 5,167,897 (Weber et al.) and US 5,366,782 (Curro et al.), both of which are incorporated herein by reference. Another means of achieving softness is the use of hydrophobic structured elastic-like film (hereinafter "SELF") webs. The structural elastic-like film web is an extensible material that exhibits elastic-like characteristics in the length direction without the use of additional elastic materials. SELF webs and processes for obtaining "SELF-passed" films are described in co-pending, commonly assigned US Patent Application Serial No. 08/203,456 (titled "Absorbent Article with Multiple Zone Structural Elastic-Like Film Web Extensible Waist Feature", D. Roe et al., filed February 24, 1994), which application is incorporated herein by reference. In addition, the microporous film maintains flexibility while maintaining a hydrophobic barrier under moderate pressure.

Preferred articles are those wherein the hydrophobic region is either a cross-linked silicone compound applied to the entire or part (preferably the entire) surface of one or both (preferably one) surfaces of the hydrophilic substrate, or are mechanically processed thin film polymers such as ring rolled or SELFed polyethylene.

B. Components of High Internal Phase Inversion Emulsion

The articles of the invention comprise an emulsion applied to a carrier. The emulsion comprises: (1) a continuous, solidified, outer fat phase; (2) an inner polar phase dispersed in the outer fat phase; and (3) a non-silicone-containing phase that forms an emulsion when the outer fat phase is fluid. An emulsifier having a viscosity at 55°C of at least about 500 centipoise. Since the internal polar phase contains a large amount of polar material, the emulsion is often referred to as a "high internal phase inverse emulsion". When subjected to low shear forces during use, such as during wiping of the skin or other surface, such high internal phase inverse emulsions will break to release the internal polar phase.

1. External lipid phase

A continuous (external), solidified external fatty phase will provide a substantially stable structure to the high internal phase inverse emulsions of the present invention. In particular, such a continuous lipid phase enables the internal polar phase dispersed therein not to be released prematurely prior to use of the product, such as during vigorous processing.

The continuous external fatty phase may comprise from about 2 to about 60% of the emulsions of the present invention. Preferably the continuous fatty phase comprises from about 5 to about 30% emulsion. Most preferably, the lipid phase comprises from about 6 to about 15% of the emulsion.

The main constituent of the continuous lipid phase is waxy lipid material. The lipid material is characterized by a melting point of about 30°C or higher, ie solid at room temperature. Preferably the lipid material has a melting point of about 50°C or higher. The melting point of the lipid material is generally in the range of about 40°C to about 80°C, more preferably in the range of about 60°C to about 70°C.

Although the waxy lipid material is solid at room temperature, it is required that the material be fluid or plastic at the temperature at which the high internal phase inverse emulsion is applied to the carrier substrate. In addition, even though the material becomes fluid or plastic at the temperature at which the emulsion is applied to the carrier, it is still desirable to withstand the elevated temperatures (e.g., about 50° C. or higher) typically encountered during storage and distribution of the articles of the present invention. There is still some stability (ie, minimal agglomeration of emulsion droplets) over extended periods of time. In addition, the lipid material needs to be sufficiently friable under the shear conditions of article use so that the material breaks up and releases the dispersed internal polar phase. It is also desirable that these lipid materials provide a good feel to the skin when used in personal care products such as wet-like cleansing wipes for perianal cleansing.

Suitable waxy lipid materials for use in the high internal phase inversion emulsions of the present invention include natural and synthetic waxes, and other oil-soluble materials having a waxy consistency. The term "wax" as used herein refers to an organic mixture or compound that is generally insoluble in polar liquids such as water and exists as an amorphous or microcrystalline solid at room temperature (eg, about 25°C). Suitable waxes include various hydrocarbons, and certain esters of fatty acids and fatty alcohols. These materials may be natural (ie animal, vegetable or mineral) or may be synthetic. Alternatively mixtures of these waxes may be used.

Some representative animal and vegetable waxes that can be used in the present invention include: beeswax, carnauba wax, spermaceti wax, lanolin, shellac wax, candelilla wax, and the like. Particularly preferred animal and vegetable waxes are: beeswax, lanolin and candelilla wax. Representative mineral waxes usable in the present invention include petroleum-based waxes such as paraffin wax, petrolatum and microcrystalline waxes, and mineral waxes or ozokerite such as white ceresin, yellow ceresin, white natural ceresin, and the like. Particularly preferred mineral waxes are petrolatum, microcrystalline wax, yellow ozokerite, and white ozokerite. Representative synthetic waxes that can be used in the present invention include olefin polymers such as polyethylene waxes, chlorinated naphthalenes such as "Halowax", hydrocarbon waxes obtained by Fischer-Tropsch synthesis, and the like. A particularly preferred synthetic wax is polyethylene wax.

In addition to the waxy lipid material, the continuous lipid phase may include minor amounts of other lipophilic or lipid-miscible materials. These other lipophilic/lipid-miscible materials are included to stabilize the emulsion in order to minimize loss of the internal polar phase on the skin or to improve the aesthetics of the emulsion. Suitable materials of this type that can be present in the continuous lipid phase include hot melt adhesives, such as Findley 193-336 resin, long chain alcohols such as cetyl alcohol, stearyl alcohol, and cetyl alcohol, insoluble in Aqueous soaps such as aluminum stearate, silicone polymers such as dimethicone, hydrophobically modified silicone polymers such as phenyltrimethicone, and the like. Other suitable lipophilic/lipid-miscible materials include: polyol polyesters. "Polyol polyester" means a polyol having at least 4 ester groups. "Polyol" means a polyol comprising at least 4, preferably 4-12, and most preferably 6-8 hydroxyl groups. Polyols include: monosaccharides, disaccharides, and trisaccharides, sugar alcohols and derivatives of other sugars (such as alkyl glycosides), polyglycerols (such as diglycerol and triglycerol), pentaerythritol, and polyvinyl alcohol. Preferred polyols include: xylose, arabinose, ribose, xylitol, erythritol, glucose, methyl glucoside, mannose, galactose, fructose, sorbitol, maltose, lactose, sucrose, raffinose , and maltotriose. Sucrose is an especially preferred polyol. For the polyol polyesters used in the present invention, it is not necessary that all of the hydroxyl groups on the polyol be esterified, however, the disaccharide polyester should have no more than 3 unesterified hydroxyl groups, more preferably no more than 2 unesterified hydroxyl groups. Typically, substantially all (eg, at least about 85%) of the hydroxyl groups on the polyol are esterified. In the case of sucrose polyesters, typically about 7-8 hydroxyl groups on the polyol are esterified.

"Liquid polyol polyester" means a polyol polyester described below having a fluid consistency at or below about 37°C. "Solid polyol polyester" means a polyol polyester described below having a plastic or solid consistency at or above about 37°C. Liquid polyols and solid polyols can be used successfully in the emulsions of the present invention as softening and fixing agents, respectively. In some cases, solid polyol polyesters can also provide some softness functionality.

2. inner polar phase

Generally, the major component of the high internal phase inverse emulsions of the present invention is the dispersed internal polar phase. When released, this internal polar phase can provide many benefits. For example, in the case of the preferred wet-like cleansing wipes for perianal cleansing, it is this released internal polar phase, preferably water, that provides these wipes with the primary cleaning action. In other products, the released inner polar phase can be used to deliver many active ingredients that are soluble or dispersible in the polar phase.

The internal polar phase can comprise from about 39% to about 97% of the emulsion incorporated into the articles of the present invention. Preferably the internal polar phase comprises from about 67 to about 92% of the emulsion. Most preferably, the polar phase comprises from about 82% to about 91% of the emulsion.

In a preferred embodiment, the internal polar phase comprises water as a main constituent. That is, the emulsion will be a water-in-lipid emulsion. In preferred embodiments, the internal polar phase comprises a substantial amount of water, preferably at least about 60%, more preferably at least about 75%, and even more preferably at least about 85% by weight of the internal polar phase. In the described embodiments, the internal polar phase may comprise, in addition to water, other water-soluble or water-dispersible materials that do not adversely affect the stability of the high internal phase inversion emulsion. One such material typically included in the internal aqueous phase is a water-soluble electrolyte. This dissolved electrolyte will minimize the tendency for materials present in the lipid phase to also dissolve in the aqueous phase. Any electrolyte that imparts ionic strength to the aqueous phase can be used. Suitable electrolytes include water-soluble mono-, divalent-, or trivalent inorganic salts, such as water-soluble halides, for example chlorides, nitrates and sulfates of alkali and alkaline earth metals. Examples of the electrolyte include: sodium chloride, calcium chloride, sodium sulfate, magnesium sulfate and sodium bicarbonate. The electrolyte is generally included in a concentration of from about 1 to about 20%, based on the aqueous phase.

Other water-soluble or water-dispersible materials that may be present in the internal aqueous phase include thickeners and viscosity modifiers. Suitable thickeners and viscosity modifiers include: water soluble polyacrylic resins and hydrophobically modified polyacrylic resins such as Carbopol and Pemulen, starches such as corn starch, potato starch, tapioca starch, gums such as guar gum, acacia , Cellulose ethers such as hydroxypropyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, etc. Concentrations of these thickeners and viscosity modifiers are generally from about 0.05 to about 0.5% based on the aqueous phase.

Other water-soluble or water-dispersible materials that may be present in the internal aqueous phase include polycationic polymers that provide steric stabilization at the water-lipid interface and nonionic polymers that also stabilize water-in-lipid emulsions. Suitable polycationic polymers include: Reten 201, Kymene ^(R) 557H and Acco 711. Suitable nonionic polymers include: polyethylene glycol (PEG) such as Carbowax. Concentrations of these polycationic and nonionic polymers are generally from about 0.1 to about 1.0%, based on the aqueous phase.

In addition to containing water, the internal polar phase can also contain polar materials, including solvents such as ethanol, isopropanol, butanol, and hexanol; diols or substituted diols such as propylene glycol, butylene glycol, or hexylene glycol; Alcohols such as diethylene glycol or triethylene glycol; glycol ethers such as short-chain (e.g. C ₁ -C ₆ ) derivatives of oxyethylene glycol and oxypropylene glycol, such as n-hexyl ether of monoethylene glycol and diethylene glycol, n-Butyl ethers of monopropylene glycol and dipropylene glycol; etc. In addition, solvents such as tetrahydrofuran, dimethylsulfoxide, acetone, etc. may also be included in the inner polar phase.

3. Emulsifier

Another key component of the high internal phase inversion emulsion of the present invention is an emulsifier. In the emulsion of the present invention, an effective amount of an emulsifier is included. The "effective amount" will depend on many factors, including the amount of lipid and polar phase components used, the type of emulsifier used, the level of impurities present in the emulsifier, and the like. Typically the emulsifier comprises from about 1 to about 10% of the emulsion. Preferably, the emulsifier comprises from about 3 to about 6% of the emulsion. Most preferably, the emulsifier comprises from about 4 to about 5% of the emulsion.

Although only a single "emulsifier" is used to describe this component, more than one emulsifier may be used when forming the emulsion. In practice, as described below, when using certain materials it will be desirable to use two or more emulsifiers. While not limiting the scope of the invention, where two emulsifiers are used, preferably the primary emulsifier is present at from about 1 to about 7%, more preferably from about 2 to about 5%, by weight of the emulsion, Most preferably from about 2 to about 4%; and from about 0.5 to about 3% secondary emulsifier, more preferably from about 0.75 to about 2%, most preferably from about 0.75 to about 1.5%. (The term "primary" or "secondary" emulsifier as used in this invention relates to the relative amounts of two or more materials employed. Therefore, when mixed with another emulsifier, the desired high viscosity A material can be a "primary emulsifier" or a "secondary emulsifier", depending on its relative amount to other emulsifiers.

Applicants have discovered that the use of non-silicone-containing emulsifiers having viscosities of at least about 500 centipoise at 55°C provides emulsions with improved wet retention compared to low viscosity emulsifiers. Preferably, the high viscosity emulsifier has a viscosity at 55°C of at least about 800 centipoise, more preferably at least about 1,500 centipoise, still more preferably at least about 5,000 centipoise, most preferably at least about 10,000 centipoise. The emulsifier typically has a viscosity of from about 500 to about 100,000 centipoise at 55°C. Viscosity was measured using a Lab-Line Instruments Brookfield type rotating disc viscometer with a _L3 spindle rotating at 6 rpm.

Without wishing to be bound by theory, it is believed that high viscosity emulsifiers increase the viscosity of the interface and provide mechanical stability to the emulsifier so that coagulation is minimized.

The emulsifier must be substantially fat-soluble or miscible with the lipid phase material, especially at temperatures at which the lipid material melts. In addition, the emulsifier should also have a relatively low hydrophilic-lipophilic balance or HLB. Preferred emulsifiers have HLB values below about 5, preferably from about 1 to about 5. More preferred are emulsifiers having an HLB of from about 1.5 to about 3.5.

Preferred high viscosity emulsifiers for use herein include those designated by Lubrizol Corporation (Wickliffe, OH) as OS-122102, OS-121863, OS-121864, OS-80541J and OS-80691J. These emulsifiers are the reaction products of (i) hydrocarbyl-substituted carboxylic acids or anhydrides, preferably polyisobutylene-substituted succinic acids or anhydrides, or salts thereof, and (ii) amines or alcohols. The material and its preparation method are described in US4,708,753 (granted to Forsberg on November 24, 1987, for details, please refer to column 3, lines 32 to 38; and column 8, line 10 to column 26, line 68), and US 4,844,756 (issued to Forsberg on July 4, 1989), both of which are incorporated herein by reference.

Other materials believed to be useful as high viscosity emulsifiers in the present invention include: hydrocarbyl-substituted succinic anhydrides as described in US 3,215,707 (issued to Rense on November 2, 1965); US 3,231,587 (issued to Rense on January 25, 1996) ; US5,047,175 (granted to Forsberg on September 10, 1991); and World Patent Publication No. WO87/03613 (published on behalf of Forsberg on June 18, 1987). These publications are incorporated herein by reference.

Another material useful as a high viscosity emulsifier is an ABA block copolymer of 12-hydroxystearic acid and polyethylene oxide. Said materials are described in US 4,203,877 (A.S. Baker, issued May 20, 1980) and US 4,875,927 (T. Tadros, issued October 24, 1989), both of which are incorporated herein by reference. A representative material of this type for use as an emulsifier in the present invention is available from Imperial Chemical Industries PLC under the designation Arlacel P135.

Although the high viscosity, non-silicone containing materials described above can be used with a single emulsifier, it may be desirable to use more than one emulsifier when forming an emulsion. For example, when certain high viscosity emulsifiers are used, a certain "sticky" feel may develop when the treated article is subjected to in-use shear stress which breaks the emulsion. In such cases, it would be desirable to use a relatively low viscosity co-emulsifier with the high viscosity emulsifier so that the amount of high viscosity emulsifier can be reduced, thereby reducing tack. The secondary emulsifier may be one of the "high viscosity" materials described above, or preferably, has a viscosity of less than 400 centipoise at 55°C. The co-emulsifier can be a non-silicone-containing or a silicone-containing emulsifier.

In a preferred embodiment of the present invention emulsifiers (i.e. reaction products of polyisobutylene-substituted succinic acids and amines) and co-emulsifiers (i.e. poly-12-hydroxystearic acid and poly ABA block copolymers of ethylene oxide, such as Arlacel P135 from ICI) or organopolysiloxane-polyoxyalkylenes such as alkyl dimethicone copolyols (such as Dow Corning Q2-5200 laurylpolyol Dimethicone copolyol) to provide improved water retention over time, and beneficial low viscosity (by reducing the amount of high viscosity emulsifiers used). It will be appreciated by those skilled in the art that the various intended uses will determine whether various emulsifiers are suitable and, if so, the appropriate relative amounts of the components. According to the content disclosed in the present invention, those skilled in the art can make the above determination only through routine experiments.

4. Selective emulsion components

The high internal phase inverse emulsions useful in the present invention may also include other optional components normally present in aqueous solutions of this type. These optional components can be present in the continuous external fatty phase, or in the internal polar phase, and include fragrances, antimicrobials (e.g., antimicrobials), pharmaceutical actives, deodorants, opacifying agents, astringents agents, skin moisturizers, etc., and mixtures of these components. The additives for the formulation are well known to those skilled in the art, and can be used in the emulsion of the present invention in an appropriate and effective amount. A particularly preferred optional ingredient for inclusion in the wet-like cleansing wipe emulsions of the present invention is glycerin as a skin conditioning agent.

Here, according to each component (for example, lipid phase component, inner polar phase component, emulsifier component, etc.) that exists after the emulsion is prepared, and the corresponding consumption of these components, the emulsion component of the product of the present invention Describe and claim protection. That is, when a stable emulsion is formed and then applied to the carrier. However, it should be understood that the description (components and amounts) of an emulsion also includes an emulsion formed by mixing the stated amounts of the components, which is different from the chemical nature of the components after emulsification and application to the carrier. irrelevant.

C. Other optional components of the wiper

In addition to the high internal phase inversion emulsions, there are additional optional components which may be included in the articles of the present invention which generally serve to improve the cleanability of the articles when the internal polar phase of the emulsion is released. Some optional components should not be present in significant amounts (eg, greater than 2% of the internal polar phase) since they would break the emulsion prematurely. Said such components include various anionic detersive surfactants having relatively high HLB values (eg, from about 10 to about 25 HLB values), such as sodium linear alkylbenzene sulfonate (LAS) or sodium alkyl ethoxy sulfate ( AES), and nonionic detersive surfactants such as alkyl ethoxylates, alkyl amine oxides, alkyl polyglycosides, zwitterionic detersive surfactants, amphoteric detersive surfactants, and cationic detersive surfactants such as whale Waxyl trimethyl ammonium salt, and lauryl trimethyl ammonium salt. See US 4,597,898 (Vander Meer), issued July 1, 1986 (herein incorporated by reference), especially columns 12 to 16 for representative anionic, nonionic, zwitterionic, amphoteric and cationic detersive surfactants . Furthermore, these high HLB detersive surfactants can be applied to or included in preparations derived from emulsions alone. For example, an aqueous solution of these high HLB detersive surfactants is applied to one side of the carrier and a high internal phase inverse emulsion is applied to the other side of the carrier. During wiping, the emulsion breaks up releasing the internal polar phase (eg water) with the result that the emulsion is then mixed with a high HLB detersive surfactant in order to provide improved surface cleaning performance.

Although the description of the invention generally refers to the addition of a single emulsion to the carrier, it should be understood that two or more different emulsions may also be used to prepare a single article. In the described embodiments, the emulsions may vary in a number of ways including, but not limited to, the ratio of the inner polar phase to the outer fatty phase, the emulsifiers used, the A component of one or both lipid phases, etc. The use of multiple emulsions in a formulation would be particularly desirable where two or more components are incompatible with each other, but each can be included in a separate emulsion. Additionally, if a specific reaction is desired at the time of use, the reactants may be provided in separate emulsions. When the emulsion is subjected to shear during use, the desired reaction will occur. For example, where lather is desired during wiping, a mild acid can be incorporated into the internal polar phase of one emulsion and a bicarbonate salt incorporated into the internal polar phase of a second emulsion. When the emulsion is subjected to shear during use, the reactants will interact to provide the desired foam.

D． Preparation of Emulsion Treated Articles

In preparing the articles of the present invention, a high internal phase inverse emulsion is first formulated. This is usually accomplished by mixing or fusing together the lipid phase components and emulsifiers. The particular temperature to which the lipid/emulsifier mixture is heated will depend on the melting points of the lipid phase components. The lipid/emulsifier mixture is generally heated to a temperature of from about 60°C to about 90°C, preferably from about 70°C to about 80°C, prior to mixing, blending or otherwise combining with the aqueous phase components. The molten lipid/emulsifier mixture is blended with the polar phase components and then mixed together, usually under low shear conditions, to provide an emulsion.

The high internal phase inverse emulsion is then applied to a support, such as a paper web or a polarphobic material laminated paper web, in a fluid or plastic state at the above temperature. The emulsion can be applied using various methods of applying materials of fluid or plastic consistency. Suitable methods include: spraying, printing (e.g. offset printing or screen printing), coating (e.g. gravure coating), extrusion or a combination of these application processes, e.g., spraying the detersive surfactant onto the web and then The emulsion was gravure coated onto a detergent treated paper web.

The emulsion can be applied to one or both sides of the support or, in the case of a multilayer web, to the inner surface of one or more of the layers making up the web. For example, in the case of a two-layer carrier, the emulsion is applied to the opposing inner surfaces of the two webs, leaving the outer surfaces of the webs free of emulsion. When applying the emulsion to both sides of the web, the application can be done sequentially or simultaneously. After the emulsion is applied to the substrate, it is allowed to cool and solidify to form a solid, usually discontinuous coating or film on the surface of the substrate.

When a paper web is used as the hydrophilic substrate, the high internal phase inverse emulsion is typically applied to the web after the web is dried, a "dry web" addition process. The emulsion may be added non-uniformly to the surface of the paper web. "Uneven" means that the amount of emulsion, the pattern of distribution, etc. may vary across the surface of the web. For example, certain portions of the web surface may contain greater or lesser amounts of emulsion, including portions of the surface that have no emulsion thereon. The high internal phase inverse emulsion can be applied to the paper web at any point after the paper web is dried. For example, the emulsion can be applied to the web after it has been creped in a Yankee dryer. It is generally preferred to apply the emulsion to the web before it is unwound from the mother roll and rewound onto a smaller finished roll.

In applying the high internal phase inverse emulsions of the present invention to supports, spray coating and gravure coating are generally preferred. FIG. 1 illustrates a preferred method of spraying the emulsion onto a support 10 . Referring to FIG. 1 , the spray coating system has a spray head 12 for applying a spray 14 of emulsion dispersion onto a support 10 .

The spraying system is activated by an assembly consisting of a ball screw drive 16 connected by a coupling 18 to a piston 26 of a hydraulic cylinder 22 . A portion of hydraulic cylinder 22 is shown in FIG. 1 filled with a high internal phase inverse emulsion indicated at 30 . Hydraulic cylinder 22 is heated to maintain emulsion 30 in a fluid or plastic state. The emulsion 30 enters the hydraulic cylinder 22 through a crossway connector 34 which has a line 38 connected to a heated fill port 42 . Connector 34 also has a line 46 connected to pressure gauge 50 and spray head 12 . There are three valves 56, 58, and 60 which control the flow rate of the emulsion in lines 38 and 46. The spray system shown in Figure 1 also has a line 64 connected to the spray head 12 which allows air (generally designated 68) to enter the spray head. Line 64 also has a pressure gauge and regulator 72 for controlling and measuring the pressure of the air in the line. Lines 64 and 46 are heated to keep the emulsion in a molten state prior to application to the web.

To fill cylinder 22 with emulsion 30, valves 56 and 60 are closed and valve 58 is opened. The ball screw driver 16 is turned on, causing the piston 26 to move to the left. The vacuum created in hydraulic cylinder 22 draws the emulsion from feed port 42 through line 38 into hydraulic cylinder 22 . To provide emulsion from hydraulic cylinder 22 to spray head 12, valve 58 is closed and valves 56 and 60 are opened. The ball screw driver 16 is turned on, causing the piston 26 to move to the right. The force of the rightward movement will force emulsion 30 out of hydraulic cylinder 22 and into line 46 of connector 34 . The emulsion will then pass through valve 60 and into spray head 12 where it is dispersed by introducing air from line 64 to provide a dispersed spray 14 which is then applied to web 10 .

Figure 2 illustrates another method of applying a high internal phase inverse emulsion involving a flexible, rotogravure coating system. Referring to FIG. 2 , the dried web 110 is unwound from a parent tissue roll 112 (in the direction of rotation indicated by arrow 112 a ) and travels forward along turnaround rolls 114 , 116 and 118 . From turning roll 118, web 110 will enter a gravure coating section, generally indicated at 120, where the emulsion is applied to both sides of the web. After leaving coating section 120 , carrier 110 becomes a treated web, indicated at 122 . The treated web 122 moves forward onto the surface of a winder reel 126 (direction of rotation indicated by arrow 126a) and is wound onto a finished paper roll 128 (direction of rotation indicated by arrow 128a).

Coating section 120 includes a pair of heated connected concave pressure rolls 130 and 134 . Press roll 130 consists of smaller anilox cylinder 138 and larger printing plate cylinder 142 ; likewise, press roll 134 consists of smaller anilox cylinder 146 and larger printing plate cylinder 150 . Anilox cylinders 138 and 146 also have ceramic or chrome surfaces, respectively, while printing plate cylinders 142 and 150, respectively, have three-dimensional patterned rubber, polyurethane, or photopolymer surfaces. The anilox and printing plate cylinders rotate in the directions indicated by arrows 138a, 142a, 146a and 150a, respectively. As shown in Figure 2, printing plate cylinders 142 and 150 face each other and provide a nip 154 through which the web 110 will pass.

At a constant volumetric flow rate, the hot melt (eg 60° C.) emulsion is pumped or sprayed into the nip 158 and 162 of each of these connected concave press rolls 130 and 134 , respectively. (The emulsion delivered to press rolls 130 and 134 may be the same or different.) In other words, when the emulsion is applied to web 110, the emulsion is applied to connected concave press rolls 130 and 134 at the same rate. This will eliminate the "build-up" of the emulsion in the system. When anilox cylinders 138 and 146 are rotated in the direction of arrows 138a and 146a, they act as rotating scrapers to evenly distribute the emulsion over the surfaces of printing plate cylinders 142 and 150, respectively, and draw Excess emulsion was removed from the printing plate.

The emulsion distributed onto printing plate cylinders 142 and 150 (rotating in opposite directions as indicated by arrows 142a and 150a ) is then transferred to both sides of web 110 at nip 154 . The amount of emulsion transferred to the web 110 can be controlled by the following variables: (1) adjusting the width of the nip 154 between the printing plate cylinders 142 and 150; (2) adjusting the anilox/printing plate cylinder pair 138/142 and The width of the nip 158 and 162 between 146/150; (3) the unevenness (i.e. the depth of the recess) of the printing pattern of the printing plate on the cylinder 142 and 150; (4) the printing of the printing plate on the cylinder 142 and 150 area (ie the area of the recess); and/or (6) the printed pattern of the printed plate on the cylinders 142 and 150 .

Specific instructions for the preparation of wet-like cleaning wipes according to the present invention

The following is a detailed description of the preparation of wet-like cleaning wipes according to the present invention by treating a support comprising a tissue paper web as a substrate with a high internal phase inverse emulsion.

Example I - toilet paper

A) Preparation of emulsion

Emulsions were prepared according to the ingredients listed in Table I.

Table I Lipid Phase Ingredients Dosage (grams) percentage Yellow pure ceresin wax (Strahl&Pitsch SP983) 300 6% Petrolatum (Fisher) 100 2% Lubrizol OS#121863 200 4% polar phase ingredients Sodium Chloride (EM Science) 50 1% Dantogard (preservative from Lonza) 25 0.5% distilled water 4325 86.5%

To prepare the polar phase components, add sodium chloride and Dantogard to distilled water and heat to 160F° (71.1°C). The lipid phase ingredients and emulsifiers (yellow ozokerite, petrolatum, and Lubrizol OS #121863) were heated to about 170 F° (76.7° C.) until molten while mixing. The polar phase and lipid phase components were then combined in a stainless steel vessel and mixed using a Hobart Model 100-C mixer set on low speed while allowing the ingredients to cool slowly. Continue mixing until an emulsion forms. Emulsion formation is evidenced by an increase in viscosity above 2000 centipoise as measured by a Lab-Line Instruments rotating disk viscometer with a _L3 spindle rotating at 6 rpm.

B) Applying the emulsion to the carrier

The emulsion was applied to a tissue web using the spray system shown in Figure 1 . The emulsion was heated to a temperature of 60°C so that the emulsion became fluid or molten. When the ball screw driver 26 actuates the piston 26 (3.5 inch diameter) to force the emulsion out of the hydraulic cylinder 22 (emulsion pressure about 12 psi), the driver moves at a linear velocity of 0.002 inches/ ^second . The emulsion enters spray head 12 (external mixing spray head with spray unit SUE15 from Spray System Inc. (Wheaton, Illinois) and is dispersed in air (1.2 ^psi ) heated to about 60°C. Then, the The emulsion is applied to the web from spray head 12 while the web is being rewound at a speed of about 28 ft/min. For example, the web may be sprayed at the nip between the rewinding roll and the finished product (as in shown in Figure 2 at the nip between the rewinding roll 126 and the finished parent roll 128). Accordingly, the emulsion is applied to both sides of the web at a rate of about 50% by dry weight of the web superior.

Alternatively, the emulsion can also be applied to a tissue paper web substrate using the flexible rotary gravure coating system shown in FIG. 2 . A hot melt (eg 60° C.) emulsion is pumped or sprayed separately into the nip 158 and 162 of each of these connected concave press rolls 130 and 134 at a constant volumetric flow rate of 20 ml/min. Anilox cylinders 138 and 146 evenly distribute the emulsion onto the surfaces of printing plate cylinders 142 and 150 (each rotating at about 40 ft/min) respectively. Cylinders 142 and 150 then transfer the emulsion to both sides of web 110 . The coated web 122 is transferred to a rewind roll 126 such that the coated center width of the web 122 exceeds the depressed print area of the roll 126 . Thus, the coated center width of web 122 is not in contact with the surface of roll 126 , whereas the uncoated edges of web 122 are in contact with the surface of roll 126 . The web 122 is then wound onto a finishing roll 128 . The emulsion was applied to both sides of the paper web 122 at a level of about 50% by dry weight of the web.

Example II - toilet paper

This example illustrates the preparation of an article comprising a paper base treated on one or both surfaces with a silicone polymer to provide hydrophobic regions. The emulsion is applied to one or both surfaces of the carrier.

A) Emulsion preparation

Emulsions were prepared according to the ingredients listed in Table II.

Table II Lipid Phase Ingredients Dosage (grams) percentage Yellow pure ceresin wax (Strahl&Pitsch SP983) twenty four 8% Petrolatum (Fisher) 3 1% Dow Corning Q2-5200 9 3% Lubrizol OS#121863 3 1% Arlamol ISML 3 1% Dow Corning 200fluid 350 centistokes 1.5 0.5% polar phase ingredients 0.1% Carbopol940 and 0.05% Span20 in distilled water adjusted to pH 6.0 with NaOH ^* 259.5 85.5%

Lipid phase ingredients and emulsifier (yellow ceresin, petrolatum, Lubrizol OS#121863, Dow Corning Q2-5200, Arlamol ISML, and Dow Corning 200fluid, 350 centistokes) were heated and stirred in a 500ml stainless steel beaker to about 180°F (82.8°C) until melted. Add the polar phase components to the beaker containing the lipid phase components. The mixture was heated to 160°F (71.1°C) and then mixed using a "Lightnin' TS2510" mixer at a speed of 500 rpm while allowing the ingredients to cool until an emulsion formed.

B) Vector preparation

The carrier is formed by treating the substrate with a hydrophobic material. The substrate is a conventional tissue paper substrate. The base paper was a 70/30 Eucalyptus/NSK, non-layered sheet with a basis weight of 21.5 lbs/ream. The paper was unwound by a gravure roll applying a 95% to 5% mixture of Syloff 7677 polymer and Syloff 7048 crosslinker (Dow Corning). The level of Syloff mixture used was 5% on a dry paper basis. Application is done on one side only, or both sides of the carrier are treated the same by passing the carrier through another print roll. The Syloff mixture is then crosslinked by passing the support through two heating zones to provide hydrophobic regions to the support. The carrier is now ready for application of the emulsion.

C) Applying the emulsion to the carrier

Using the spray system shown in Figure 1, the emulsion prepared in Step A was applied. The emulsion was heated to a temperature of 60°C so that the emulsion became fluid or molten. When the ball screw driver 26 actuates the piston 26 (3.5 inch diameter) to force the emulsion out of the hydraulic cylinder 22 (emulsion pressure about 12 psi), the driver moves at a linear velocity of 0.002 inches/second. The emulsion enters spray head 12 (external mix spray head with spray unit SUE15 from Spray System Inc. (Wheaton, Illinois) and is dispersed in air (1.2 ^psi ) heated to about 60°C. Then, in the form of dispersed mist The emulsion is applied to the carrier from the spray head 12 while the carrier is rewinding at a speed of about 28 ft/min. For example, the carrier can be sprayed at the nip between the rewinding roll and the finished product (as shown in Figure 2 at the nip between rewind roll 126 and finished master roll 128). Thus, the emulsion was applied to both sides of the support at a level of about 50% by dry weight of the support.

Alternatively, the emulsion can also be applied to the support using the flexible rotary gravure coating system shown in FIG. 2 . At a constant volume flow rate of 20 ml/min, the hot melt (eg 60° C.) emulsion is pumped or sprayed into the nips 158 and 162 of each of these attached concave press rolls 130 and 134, respectively. Anilox cylinders 138 and 146 evenly distribute the emulsion onto the surfaces of printing plate cylinders 142 and 150 (each rotating at about 40 ft/min) respectively. Cylinders 142 and 150 then transfer the emulsion to both sides of carrier 110 . The coated carrier 122 is transferred onto a rewind roll 126 such that the coated center width of the carrier 122 exceeds the depressed print area of the roll 126 . Thus, the coated center width of the carrier 122 is not in contact with the surface of the roller 126 , whereas the uncoated edges of the carrier 122 are in contact with the surface of the roller 126 . The carrier 122 is then rolled onto a finish roll 128 . The emulsion is applied to both sides of the support at an amount of about 50% by dry weight of the support to provide the article of the invention.

Example III - toilet paper

A) Emulsion preparation

Emulsions were prepared according to the ingredients listed in Table III.

Table III Lipid Phase Ingredients Dosage (grams) percentage Yellow pure ceresin wax (Strah&Pitsch SP983) 18 6% Lubrizol OS#122102 18 6% Tween 60 from ICI 0.9 0.3% polar phase ingredients distilled water 263.1 87.7%

The lipid phase ingredients and emulsifier (yellow ceresin, Lubrizol OS #122102 and Tween 60) were heated to about 160°F (71.1°C) and mixed in a 500ml stainless steel beaker until molten. Distilled water (polar phase ingredients) was added to the beaker containing the lipid phase ingredients. The mixture was heated to 160°F (71.1°C) and then mixed using a "Lightnin' TS2510" mixer at a speed of 500 rpm. The mixture was allowed to cool until an emulsion formed.

B) Applying the emulsion to the substrate

The emulsion was applied to the tissue web by spray coating or flex rotogravure coating according to the procedure of Example I.

Example IV - toilet paper

A) Emulsion preparation

Emulsions were prepared according to the ingredients listed in Table IV.

Table IV Lipid Phase Ingredients Dosage (grams) percentage Paraffin (Aldrich) 9 9% Lubrizol OS#122102 2 2% Arlacel P135 2 2% polar phase ingredients sodium sulfate 1 1% distilled water 86 86%

In a 500 ml stainless steel beaker, heat the lipid phase ingredients and emulsifier (paraffin and Lubrizol. OS #122102) to about 140°F (60°C) and mix until melted. The remaining polar phase ingredients (sodium sulfate and distilled water) were added to the beaker containing the lipid phase ingredients. The mixture was heated to 140°F (60°C) and then mixed using a "Lightnin' TS2510" mixer at a speed of 500 rpm. The mixture was allowed to cool until an emulsion formed.

B) Applying the emulsion to the substrate

The emulsion was applied to the tissue web by spraying or flexible rotogravure coating according to the procedure of Example 1 .

Example V - Baby Wipes

This example illustrates the preparation of an article comprising a polyethylene film (ie, a hydrophobic layer) that has been treated with an emulsion on one side. The treated film is positioned between two paper bases to provide an article that is wetted on only one side when subjected to shear forces. The remaining dry side absorbs any remaining liquid after use.

A) Emulsion preparation

According to the ingredients listed in Table V, an emulsion containing 88% internal polar phase was prepared.

Table V Lipid Phase Ingredients Dosage (grams) percentage Yellow pure ceresin wax (Strahl&Pitsch SP983) 18 6% Petrolatum (Fisher) 3 1% White ozokerite (Strahl&Pitsch SP1190) 6 2% Lubrizol OS#121863 9 3% polar phase ingredients 0.1% Carbopol in distilled water adjusted to pH 6.0 with NaOH ^* 264 88% ^* Carbopol ^(R) is an acrylate thickener available from BF Goodrich. In a 500ml stainless steel beaker, heat the lipid phase ingredients and emulsifiers (yellow ceresin, petrolatum, white ozokerite and Lubrizol OS #121863) to approximately 180°F (82.8°C) and mix until melted until. The inner polar phase component was prepared by adding 0.5 g of Carbopol® ⁹⁴⁰ and 499.5 g of distilled water to a 1 liter glass beaker and mixing until the Carbopol® ⁹⁴⁰ was completely dissolved. The pH of the polar solution was adjusted to 6.0 with an appropriate amount of 1N NaOH. A portion of this polar solution (264 g) was added to the beaker containing the lipid phase ingredients. The resulting mixture was heated to 160°F (71°C) and then mixed using a "Lightnin'TS2510" mixer at a speed of 500 rpm while allowing the mixture to cool until an emulsion formed.

B) Emulsion Application/Vehicle Preparation

The emulsion of step A) was applied to a hydrophobic, water-impermeable, ring-rolled polyethylene film by spray coating or flexible roto-gravure coating according to the procedure of Example I.

The emulsion-treated film was positioned between two hydroentangled substrates, each substrate consisting of about 40% natural fibers and about 60% polypropylene fibers (available from Fibertech). The total basis weight of each of the two outer substrates is about 30 g/m ² .

The support was then passed through a printing section where it would be continuously coated with General Electric's UV9300 silicone release polymer and UV9310C photoinitiator (98/2). The support is then crosslinked by means of a UV light source to form the article of the invention.

Example VI - Hard Surface Wipes Containing Antimicrobial Agents

A) Emulsion preparation

Emulsions were prepared according to the ingredients listed in Tables VI and VI-a.

Table VI Lipid Phase Ingredients Dosage (grams) percentage Yellow pure ceresin wax (Strahl&Pitsch SP983) 18 6% Petrolatum 6 2% Lubrizol OS#122102 12 4% Water phase (listed in Table VI-a) 264 88%

Table VI-a polar phase ingredients Dosage (grams) Percentage of Whole Emulsion Hydrogen peroxide (35% active from Sigma-Aldrich) 18 6% Dequest 20605 (50% active from Monsanto) 1.2 0.4% Isopropanol (from Sigma-Aldrich) 45 15% Eugenol (from Sigma-Aldrich) 0.3 0.1% distilled water 199.5 66.5%

The lipid phase ingredients and emulsifiers (yellow ceresin, petrolatum, and Lubrizol OS #122102) were heated to about 160°F (71.1°C) and mixed in a 500ml stainless steel beaker until molten. The polar phase ingredients were heated to 160°F and mixed using a Greerco high shear mixer to form a dispersion. The polar phase was then added to the beaker containing the lipid phase ingredients and mixed using a "Lightnin' TS2510" mixer at a speed of 500 rpm. Allow the mixture to cool until an antibacterial emulsion forms.

B) Applying the emulsion to the substrate

The emulsion was applied to the tissue web by spray coating or flex rotogravure coating according to the procedure of Example I.

Example VII - Hard Surface Wipes Containing Antimicrobial Agents

A) Preparation of emulsion

An emulsion with an internal polar phase of 87% (consisting primarily of water) was prepared according to the ingredients listed in Table VII.

Table VI Lipid Phase Ingredients Dosage (grams) percentage Strahl & Pitsch SP983 twenty four 8.0 Petrolatum 6 2.0 Lubrizol OS#122102 9 3 polar phase ingredients distilled water 617.76 77.22 HEDP 0.16 0.02 hydrogen peroxide 5.6 0.7 ethanol 69.6 8.7 C-12 amine oxide 0.8 0.10 Geraniol 1.04 0.13 Limonene 0.52 0.065 Eukalyptol 0.52 0.065

To prepare the polar phase components, combine all components together and heat to 140°F (45.8°C). Separately, the lipid phase ingredients were heated to about 140°F (45.8°C) until molten while mixing. The polar phase and lipid phase components were then combined in a stainless steel vessel and mixed using a Hobart Model 100-C mixer on the low speed setting while allowing the ingredients to cool slowly. Continue mixing until an emulsion forms. Emulsion formation is evidenced by an increase in viscosity of greater than 2000 centipoise as measured by a Lab-Line Instruments rotating disc viscometer.

B) Applying the emulsion to the carrier

The emulsion was applied to the carrier material as described in Example V.

Example VIII

A) Preparation of emulsion

A high internal phase emulsion with an internal phase of 88.5% was prepared according to the ingredients listed in Table VIII.

Table Ⅷ Lipid Phase Ingredients Dosage (grams) percentage Yellow pure ceresin wax (Strahl&Pitsch SP983) 350 7% Petrolatum (Fisher) 50 1% Lubrizol OS#122102 150 3% Arlacel P135 emulsifier (from ICI) 25 0.5% polar phase ingredients Sodium Carbonate (Anhydrous) 25 0.5% Dantogard (preservative from Lonza) 25 0.5% Denatured ethanol (3A from VRW Scientific) 2000 40% distilled water 2375 47.5%

To prepare the polar phase components, add Dantogard, sodium carbonate, and ethanol to distilled water, then heat to 160F° (71.1°C). Separately, the lipid phase ingredients (yellow ceresin, petrolatum, emulsifier Lubrizol OS #122102 and emulsifier Arlacel P-135) were heated to about 170F (77°C) until molten while mixing. The polar phase and lipid phase components were then combined in a stainless steel vessel and mixed using a Hobart Model 100-C mixer on the low speed setting while allowing the ingredients to cool slowly. Continue mixing until an emulsion forms. Emulsion formation is evidenced by an increase in viscosity of greater than 2000 centipoise as measured by a Lab-Line Instruments rotating disc viscometer.

B) Applying the emulsion to the carrier

The emulsion was applied to the support according to the procedure described in Examples I-VII.

Claims (11)

1. goods comprise:

A. carrier; With

B. be applied to the emulsion on this carrier, described emulsion comprises:

(1) it is 30 ℃ or higher wax shape lipid materials that successive, the solid-state outer fat phase of 2-60%, described lipoid comprise fusing point mutually;

(2) 39-97% is scattered in the interior polar phase of outer fat in mutually; With

(3) when being in the fluid attitude mutually, outer fat can form the emulsifying agent that contains non-silicone emulsion, effective dose; The viscosity of this emulsifying agent in the time of 55 ℃ is at least 500 centipoises.

2. the goods of claim 1 is characterized in that, in the weight of interior polar phase, interior polar phase comprises the water of at least 60% weight, the water of preferred at least 75% weight, the more preferably water of at least 85% weight.

3. claim 1 or 2 goods is characterized in that the viscosity of emulsifying agent in the time of 55 ℃ is at least 1,500 centipoise, preferably at least 5,000 centipoise, more preferably at least 10,000 centipoise.

4. each goods of claim 1-3 is characterized in that carrier comprises a base material, and described base material is selected from: textile material, and non-woven material, foamed materials, sponge, bat, sphere, expander or thin film, preferably this carrier comprises tissue paper.

5. each goods of claim 1-4 is characterized in that, the outer fat that emulsifying agent comprises 5-30% mutually and the interior polar phase of 67-92%; The melting range of wax shape lipid materials is 40-80 ℃.

6. the goods of claim 1 is characterized in that, wax shape lipid materials is selected from: animal wax, vegetable wax, ceresine, synthetic wax and composition thereof, preferred wax shape fat material is selected from: Cera Flava, lanoline, candelilla wax, vaseline, microwax, yellow ceresin, white ceresine, Tissuemat E or its mixture.

7. goods comprise:

A. carrier; With

B. be applied to the emulsion on this carrier, described emulsion comprises:

(1) it is 30 ℃ or higher wax shape lipid materials that successive, the solid-state outer fat phase of 2-60%, described lipoid comprise fusing point mutually;

(2) 39-97% is scattered in the interior polar phase of outer fat in mutually; With

(3) when being in the fluid attitude mutually, outer fat can form emulsifying agent emulsion, effective dose; It is characterized in that this emulsifying agent is the carboxylic acid or the anhydride of alkyl-replacement, or its salt, ester or amide.

8. the goods of claim 7 is characterized in that, in interior polar phase weight, interior polar phase comprises the water of at least 60% weight, the water of preferred at least 75% weight, the more preferably water of at least 85% weight.

9. claim 7 or 8 goods is characterized in that, emulsifying agent is carboxylic acid or the anhydride that (ⅰ) polyisobutylene replaces, or its salt; (ⅱ) product of amine or alcohol.

10. one kind is applied to method on the carrier with emulsion, and this method comprises the steps:

A. form emulsion, this emulsion comprises:

(1) it is 30 ℃ or higher wax shape lipid materials that successive, the solid-state outer fat phase of 2-60%, described lipoid comprise fusing point mutually;

(2) 39-97% is scattered in the interior polar phase of outer fat in mutually; With

(3) when being in the fluid attitude mutually, outer fat can form the emulsifying agent that contains non-silicone emulsion, effective dose; The viscosity of this emulsifying agent in the time of 55 ℃ is at least 500 centipoises;

B. fat has mutually under the temperature of fluid or wet consistency described emulsion is applied on this carrier outside being enough to make;

C. make the emulsion that applies be cooled to the enough low temperature of outer fat solidifying.

11. the method for claim 10 is characterized in that, at 60-90 ℃, preferably in 70-80 ℃ temperature range emulsion is applied on the carrier.

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