MXPA00006389A - A flushable release film with combination wiper - Google Patents

Abstract

The present invention is directed to a flushable release liner/wiper combination. The flushable release liner/wiper combination is formed by applying a release coating onto a first surface of a water-sensitive film and an absorbent fibrous material onto an opposite surface of the water-sensitive film. The flushable release liner/wiper combination maintains its integrity and strength when in use, but loses its integrity and strength when placed in contact with water. The flushable release liner/wiper combination quickly breaks up and disperses in a flushing toilet or sink due to the force of the flowing water on the liner/wiper combination. Moreover, the present invention is directed to methods of making the flushable release liner/wiper combination and water-dispersible products, including flushable products, which contain the flushable release liner/wiper combination.

Description

A CLEAR AND DISPOSABLE PEL WITH DISCHARGE OF WATER WITH COMBINATION OF CLEANER RELATED REQUESTS The present non-provisional application claims benefit of the priority of the corresponding patent application provision 60 / 070,258, filed on December 31, 1997.

FIELD OF THE INVENTION The present invention is directed to a combination of liner / release cleaning cloth and disposable with water discharge. The combination of cleaning and release liner and disposable with water discharge is formed by applying a release coating on at least one surface of a water-sensitive film and attaching a cleaning cloth to the opposite surface of the water-sensitive film. The combination of disposable cleaning cloth / liner with water discharge maintains its structural integrity and strength when in use, but begins 'Disperse when placed in contact with water. When placed in a conventional washbasin or toilet, the combination of cleaning cloth / release liner and disposable water discharge quickly loses its integrity and strength and breaks under the forces of flowing water. Furthermore, the present invention is directed to products that include disposable products with water discharge and non-disposable with discharge? water, which contain the combination of cleaning cloth / release and disposable with water discharge.

BACKGROUND OF THE INVENTION Disposable products have revolutionized the modern lifestyle and are of great convenience for society. Such products are generally relatively cheap, sanitary and quick and easy to use. Waste ? Such products, however, are a concern when you are closing the landfills and because the incineration contributes to the pollution and urban fumes. Consequently, there is an urgent need for disposable products that can be discarded without being thrown between land filling or by means of incineration. An alternative to the ideal disposal would be the use of municipal drainage treatment plants and private residential septic systems. The proper products to be disposed of in drainage systems that can be disposed of with water discharge in a conventional toilet are called "disposable with water discharge". An essential characteristic of disposable products with water discharge is that they must have sufficient strength for their intended use but that they will not lose their structural integrity in contact with water.

Numerous products for the consumer, which were previously incapable of being discarded in a conventional retret, have now been made disposable with water discharge. Such products include water-soluble films, cleaning cloths, plug applicators, etc. However, many consumer products have remained non-disposable with water discharge.

One such product that has remained non-disposable with water discharge to date is that of the release liners. The release liners are used to temporarily cover a layer of adhesive before use in many personal care products. The release liner provides protection to the adhesive layer against exposure to the materials, which could adversely affect the ability of the adhesive strip to adhere to a desired substrate, and provides protection against premature or unwanted adhesion to an adhesive. substratum. Conventional release liners comprise a paper substrate coated with a releasable coating. The release liner is formulated to provide very little adhesion of the coated paper to any other substrate, particularly the pressure sensitive hot melt adhesives, so that the release liner can be easily removed from the adhesive strip without disturbing the adhesive strip. Typically, the release coatings comprise a silicone-containing polymeric material.

Release liners are used in many personal care products. For example, many sanitary napkins have an adhesive strip on the back of the towel (the towel surface opposite the body contact surface) to secure the towel to an inside towel and hold the towel in place against the towel. body Before use, the adhesive strip is protected with a peel release liner. Once it has been removed, the peel release liner should be discarded. Since conventional peelable release liners are typically coated with silicone, the release liners do not disperse in the water; consequently, the disposal options are limited to deposit the release liner in a garbage receptacle. Even when the disposition of conventional release liners in a toilet would be. Convenient for the consumer, such inappropriate disposal potentially creates locks in the toilet or in the domestic drain pipe.

In addition, conventional peel release liners, once they have been removed from an adhesive strip, have very little utility. Consumers typically discard the release liner immediately after removal of the adhesive strip. Frequently, a consumer wants to clean the perineal area of the body before using a new sanitary napkin. With conventional release liners, the consumer may resort to using a separate cleaned product, such as a bath tissue to clean the perineal area.

What is required in the art is a combination of disposable release cloth / liner with low cost water discharge, which can be discarded and then discarded with water discharge in a conventional toilet. Such a releasable and disposable wipe / wipe combination with water discharge will function as a release liner that has an additional utility as a wiping cloth, eliminating the need to use a separate product to clean the perineal area of the body before using a new one. sanitary towel. Such a disposable release liner / drain pad combination will often offer convenience to the consumer, and will not cause problems such as blockages in the transport process in the drain.

S NTESIS OF THE INVENTION The present invention is directed to a combination of disposable wipe / release liner with water discharge comprising a thin release liner on a first surface of a water-sensitive film and an absorbent wipe attached to a water-sensitive film. second surface of the water-sensitive film, which is opposite the first surface. The combination of cleaned absorbent cloth / coated water sensitive film works with conventional release papers and conventional cleaning materials currently in use. Conventional release papers comprise a peelable coated paper, which covers the adhesive strip on a female sanitary napkin. unlike conventional release papers, the combination of absorbent cleaning cloth / coated water-sensitive film of the present invention provides utility as a cleaning cloth and quickly loses strength integrity when disposed of in a conventional toilet. Without the support of the water-sensitive film, the thin release coating and the absorbent cleaning cloth material begin to break under the force of the water discharge. The three-layer structure of the disposable wipe / release liner combination with water discharge offers (1) the operation of a paper-based release liner with a cleaning surface; (2) the additional option of waste in a toilet; and (3) potentially lower cost.

The present invention is also directed to a method for preparing a combination of disposable cleaning cloth / release liner with water discharge. The method comprises coating a thin layer of polymer having the release characteristics on a base film, wherein the base film comprises a water-sensitive polymer. When the resulting two-layer laminate is dry, exhibit mechanical characteristics comparable to those of a conventional coated paper liner. The base film itself can be manufactured taking into consideration variables such as film thickness, molecular weight, and mixed additives, to control the functionality of the plastic film. The polymeric coating controls the characteristics of the release of the plastic film. The coating is formulated to provide very little adhesion to many particularly pressure sensitive hot melt adhesive substrates, so that the coating can be easily removed from an adhesive strip without disturbing the adhesive strip while having a high adhesion to the film substrate. sensitive to water. The coating formula ensures that the two-layer polymer film is peeled off on the release coating surface, not at the interface between the coating and the water-sensitive base film.

The coated water-sensitive film is also combined with an absorbent as is known by those with ordinary skill in the art, desirably by extrusion lamination. The fibrous material, regardless of the coated film, may be disposable with water discharge / dispersible when placed in contact with water, such as is found in a conventional lavatory lavatory.

The present invention is also directed to articles containing the combination of wiper cloth / liner d disposable release with water discharge. Specifically, the combination of disposable wiping cloth / release liner with water discharge of the present invention is useful in connection with a variety of products, and especially absorbent products such as sanitary napkins, panty liners, diapers, bandages and similar. Although the release liner of the present invention finds particular use in the above mentioned products, the concept of a disposable release liner / drain liner combination with water discharge has a potential for any other application requiring a release material. .

The present invention provides a mechanism for eliminating the waste problems associated with various products for the consumer. A detailed and non-limiting description of the invention and the examples of the specific incorporations are provided below.

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a combination of disposable release liner with water discharge comprising a thin release coating on a first surface of a water-sensitive film and an absorbent cleaning cloth on a second opposite surface of the film. sensitive to water. The water-sensitive film coated with the cleaning cloth / release liner combination functions as a conventional release paper. However, unlike conventional release papers, the coated water-sensitive film of the present invention is disposable with discharge of water. Water. As used here, the term "disposable with water discharge" describes a product which quickly loses integrity and resistance when discarded in a conventional toilet or lavab, and breaks under the force of the flowing water that results in the product It can be transported by water flowing through a drainage system to a municipal drainage treatment plant or to a private residential septic system. In addition, the combination of disposable wiping cloth / release liner also provides an absorbent cleaning surface, unlike conventional release papers. The disposable feature with water discharge of the cleaning cloth / release liner combination of the present invention comes from the water sensitivity of the bas film and the low strength of the thin release coating of the absorbent cleaning cloth material. When water is immersed, the exposed surfaces of the base film easily become wet and weak. The water sensitive film quickly loses its integrity and resistance when exposed to water. When the film substrate loses its mechanical integrity, the release coating and the absorbent cleaning cloth material, which are thin and mechanically weak, begin to disperse under the force of discharging water from a toilet or the force of the flow of the water in a 1avabo.

The combination of disposable wiping cloth / release liner of the present invention was prepared by any single or multiple step process wherein a thin layer of a "release material" is coated on a first surface of a Water-sensitive film and an absorbent fibrous material is attached to a second opposite surface of the water-sensitive film. As used herein, the term "release material" describes a material which possesses release characteristics.

In the multi-step processes to form the combination of disposable wiping cloth / release liner with water discharge of the present invention, the order of the steps of the method is not important. For example, the water-sensitive film can be coated with a thin layer of the release material and subsequently attached to the absorbent fiber material. Alternatively, the water-sensitive film can be attached to the absorbent fibrous material and subsequently coated with a thin layer of the release material In a one-step process to form the combination of disposable cleaning cloth / release liner with water discharge. The present invention, the thin layer of the release material, the water sensitive film and the absorbent fibrous material are laminated simultaneously together.

The release material can be coated on the water sensitive film by any process known to those skilled in the art. Suitable processes for coating the release material on the water-sensitive film include, but are not limited to, extrusion coating, solvent-based coating and hot-melt coating. Suitable extrusion coating techniques include, but are not limited to, curtain extrusion coating, and coating coextrusion and water sensitive film. Suitable coextrusion coating techniques include, but are not limited to, a cold melt roll process and a blown bubble extrusion process. Suitable solvent base coating techniques include, but are not limited to, coating spray and grid printing. Suitable hot-melt coating techniques include, but are not limited to, slotted coating, spray coating, grid printing and co-etching. Desirably, the coating process for coating the release material on the water sensitive film is a thermofused slot coating process or extrusion coating process.

In an embodiment of the present invention, continuous coating of the release material is applied to the water sensitive film by the following method. The melt release material is delivered to a melt tank through a heated hose to a slot die. The temperature of the melt tank, the hose and the slot die can vary depending on the melting rheology of the release material in the coating process. The molten material is applied uniformly directly on the water sensitive film (direct coating), or alternatively, on a carrier substrate and subsequently transferred to the water sensitive film. (coating by transfer). The line speeds may vary depending on the "open time" of the release material. As used here, the "open time" of the material refers to the amount of time that is required by the material to lose its tackiness. In a transfer coating process, the coated carrier substrate is further moved through the process and brought into contact with the water-sensitive film, which is suitably aligned with the coated carrier substrate. The coating is transferred from the carrier substrate to the water-sensitive film under pressure as the film and the carrier substrate pass through a pressure point roller. In practice, the optimum coating thickness is achieved by adjusting the processing actors which include, but are not limited to, the release material, at the coating temperature, at the resin flow rate, at the speed of the coating. line and the pressure applied to the pressure point roller.

In a further embodiment of the present invention, a discontinuous coating of the release material is applied to the water-sensitive film by the following method. The melt release material is delivered from a melt tank through a heated hose to a slot die located within a grid cylinder. As in the method described above, the temperature of the melting tank, the hose, and the grid cylinder may vary depending on the melting rheology of the release material in the coating process. The melt release material is evenly distributed over the inner wall of the rotating grid cylinder, and then applied through the grid holes as a geometric pattern of discrete dots, directly onto a water-sensitive film (direct coating), or alternatively, on a carrier substrate outside and to one side of the rejill cylinder (transfer coating). The grid and the film / carrier substrate can be moved at the same or different speeds depending on the distortion of the desired dot shape. When the grid and the film / carrier substrate s move at the same speed, symmetrical points are produced. When the grid and the film / carrier substrate travel at different speeds, elongated points are produced in the machine direction. The online speed may vary depending on the open time of the release material. In the transfer coating process, the points are scattered as a result of the clamping point pressure. The degree of spreading will depend on the pressure, the open time of the release material, and the coating speed. In practice, the spacing of points can be controlled by adjusting the processing factors which include, but are not limited to, the release material, the coating temperature, the grid pattern, the resin flow rate, at the grid speed, at the line speed, and at the pressure applied to the roller d pressure point.

It should be noted that the carrier substrate used in the transfer coating process described above can be any substrate which can transfer the release coating to the water sensitive film. Suitable carrier substrates exhibit little or no adhesion to the release coating relative to the adhesion between the water sensitive film and the release coating. Suitable carrier substrates include, but are not limited to, release paper, release films, release coated substrates such as fabrics and / or webs. Desirably, the carrier substrate is a release paper. More desirably, the carrier substrate is an AKROSIL® High Release Paper.

In yet another embodiment of the present invention, a coating of release material on the water sensitive film is co-extruded. In this process, the melt release material is delivered from an extruder through a heated hose to an extrusion chamber. In a separate extruder, the melt-water sensitive film material is delivered from the separated extruder through a second heated hose to an adjacent extrusion chamber. The release material and the water sensitive film material are allowed to contact each other within the extrusion chamber and simultaneously extruded to form the coated film.

In any of the aforementioned coating processes, the adhesion of the release coating of the water-sensitive film must be greater than the adhesion of the release coating to the grid (direct coating) or to the carrier substrate (co-transfer coating). The choice of release material should take into consideration the desired release characteristics and adhesion properties of the release material. The release material must have good adhesion to the water-sensitive substrate. Suitable release materials for use in the present invention include any processable material with an appropriate melt rheology, release characteristics and adhesion properties suitable for application by the coating processes described above. Suitable materials include, but are not limited to, water-insoluble materials such as polyolefins, fluoropolymers, and silicones, as well as water-dispersible materials such as silicone esters, silicone ester copolymers, or water mixtures. compounds that contain silicone.

One or more of the release materials mentioned above can be combined to form the release coating of the disposable release / release liner combination with water discharge. In addition, the release material may contain one or more of the following additives, including, but not limited to, compatibilizers, processing aids, plasticizers, glutinizers, debonders, slipping agents, and antimicrobial agents, such as manufacturing agent or as modifiers depending on the specific properties desired in the release coating and in the final product. The release coating should be formulated to provide poor adhesion to a variety of substrates, particularly to pressure-sensitive hot-melt adhesives, so that the coating can be easily removed from the adhesive strip without disturbing the adhesive strip, while still having high adhesion to the water sensitive film of the combination d wiper cloth / disposable release liner with water discharge. The coating formula ensures that the combination d disposable release liner with water discharge is peeled off on the surface of the release liner, not at the interface between the liner and the water sensitive bas film of the cloth combination. Cleaner / liner d disposable release with water discharge.

In one embodiment of the present invention, the release coating of the disposable release / release liner combination with water discharge is a polyalpha having a melt viscosity of from about 400 to about 8,000 centipoises at 190 ° C. Such polyolefins include, but are not limited to amorphous ethylene-propylene copolymers. Particularly suitable release materials are manufactured by U.S. Rexene Company, under the REXTAC® brand. A REXTAC® RTE32 resin is particularly suitable for the present invention. In a further embodiment, one or more REXTAC® resins are mixed with high molecular weight hydrocarbon of low molecular weight to reduce the tackiness of the release material coating. Desirably, the highly branched hydrocarbon has a weight average molecular weight (Mn) of less than about 2800. U highly branched hydrocarbon, of particularly low molecular weight, VYBAR® 253 (average and wet molecular weight = 520) is manufactured by Petrolite Corporation. The mixtures of REXTAC® and VYBAR® 253 provide good results as release coating materials. Desirably the ratio of REXTAC® resin to VYBAR® 253 is from about 100/0 weight / weight to about 70/30 weight / weight. More desirably, the ratio of REXTAC® resin to VYBAR® 253 is d from about 98/2 w / w to about 75/25 w / w * More desirably, the ratio of the REXTAC® resin to VYBAR 253 is from about 95/5 weight / weight to around 80/2 weight / weight. Particularly useful mixtures are RTE32 / VYBAR 253 (95/5 weight / weight) and RTE32 / VYBAR® 253 (80/20 weight / weight).

The release coating thickness can vary greatly from the final use of the combination of disposable cleaning cloth / release liner with water discharge and / or the products containing the disposable release / release liner combination with water discharge. However, the film thickness should be minimized when possible to reduce the cost of the product and to reduce the mechanical strength of the coating, particularly for the disposable products, so that the coating will disperse due to the waste forces with water discharge. over the coating. It should be noted that a suitable discontinuous release coating may have a thickness greater than a suitable continuous release coating. Desirably, the thickness of the release coating will be less than about 2.0 mils (50.8 microns). More desirably, the thickness of the release coating will be less than about 0.5 mils (12.7 microns). More desirably, the thickness of the release coating will be less than about 0.1 mils (2.5 microns). However, the coating should be sufficient to provide release characteristics along the surface of the film.

The water-sensitive films for use in the combination of disposable wipe / release liner with water discharge of the present invention include any water-sensitive film capable of supporting the coating processes described above. As used herein, the phrase "water-sensitive film describes films, which lose their integrity over time when in the presence of water and include, but are not limited to, water-soluble films and water-dispersible films. Suitable include, but are not limited to, polyalkylene oxides, such as polyethylene oxide (PEO) and copolymers of propylene oxide / ethylene oxide, polymethacrylic acid, polymethacrylic acid copolymers, polyvinyl alcohol, poly (2-eti oxazoline), polyvinyl methyl ether, copolymers of polyvinyl pyrrolidone vinyl acetate, methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, eti hydroxyethyl methyl cellulose, methyl ether starch, poly (n-isopropyl acrylamide), poly N-vinyl caprolactam, polyvinyl methyl oxazidone, poly (2-isopropyl-2-oxazoline) and poly (2,4-dimethyl-6-triazinyl ethylene).

The water sensitive film component of the disposable release liner / coater combination with water discharge can also be made by combining several different types of water sensitive materials and films. Additionally, the water-sensitive film can be made entirely of a polymeric material sensitive to water or can contain water-sensitive as well as water-insoluble materials as long as the film is dissolved or dispersed in water, such as a conventional washbasin or toilet. The water-sensitive film component of the present invention may comprise up to about 70% by weight of the water-insoluble material depending on a number of factors such as the type of water-insoluble material incorporated in the water-sensitive polymeric material, the morphology of the mixture of insoluble material in water / water sensitive material, and process to make the film sensitive to water. Water-insoluble materials include, but are not limited to, polymeric materials and inorganic fillers, such as calcium carbonate or titanium dioxide. Inorganic fillers with water-insoluble materials are particularly useful for incorporation into the water-sensitive films of the present invention in order to reduce film costs and provide aesthetic properties to the film, such as color and texture. In some embodiments, it may be desirable to employ one or more additives in the water-sensitive film material including, but not limited to, compatibilizers, processing aids, surfactants, plasticizers, glutinizing agents, deagglutinating agents, to slip agents, and to antimicrobial agents, such as manufacturing agents or modifiers depending on the specific properties desired in the film and in the final product.

Desirably, the water sensitive film component of the present invention comprises a polyalkylene oxide film or a polyvinyl alcohol film. More desirably, the water sensitive film component of the present invention comprises a polyethylene oxide film, a propylene oxide / ethylene oxide copolymer film or a polyvinyl alcohol film. In an embodiment of the present invention, the water sensitive film component of the present invention comprises a polyethylene oxide film or a polyvinyl alcohol film. The polyethylene oxide film is the most desirable film for the pe transfer coating process, while the polyvinyl alcohol film is the most desirable film for the direct coating process. In a further embodiment of the present invention, the water-sensitive film of the wipe / disposable release liner combination with water discharge comprises about 80% by weight of polyethylene oxide, 15% by weight of poly (acrylic acid) -co-ethylene) and 5 by weight of surfactant.

The thickness of the water-sensitive film of the combination of cleaning cloth / disposable release liner with water discharge can vary greatly depending on the final use of the combination of cleaning cloth / disposable release liner with water discharge and / or products that They contain the combination of disposable cleaning cloth / liner with water discharge. The film thickness can be minimized when possible to reduce the cost of product and to reduce the time necessary for the film to be dispersed, especially in the case of disposable products.

Desirably, the thickness of water sensitive film will be less than 2.0 mils (50.58 microns), more desirably, the thickness of water sensitive film will be d from about 0.1 mil (2.5 microns) about 1.4 mils. inch (35.6 micrometers). More desirably, the thickness of the water-sensitive film will be from about 0.1 mil (2.5 microns) to about 0.5 mil (12.7 microns).

The method of preparing the wipe / disposable release liner combination with water discharge of the present invention further comprises attaching absorbent fibrous material to a second surface of the water-sensitive film, opposite to the coating of release material. . Any method known to those of ordinary skill in the art can be used to combine the water-sensitive film and the absorbent fibrous material of the combination of cleaning cloth / disposable release liner with water discharge. Suitable processes for attaching the absorbent fibrous material to the water-sensitive film include, but are not limited to, extrusion lamination, bonding with adhesive and ultrasonic bonding. In an embodiment of the present invention, the absorbent fibrous material is laminated by extrusion to the water-sensitive film upon release of the water-sensitive film from an extruder. In this process the absorbent fibrous material is brought into contact with a sticky surface of the water-sensitive film and optionally passes through a clamping point. The tackiness of the water-sensitive film (and the pressure of the clamping point results in the adhesion of the absorbent fibrous material to the surface of the water-sensitive film.) In an alternate process, the absorbent fibrous material is placed in contact with a water-sensitive surface. The water-sensitive film, which has been coated with an adhesive material, in this process, the choice of the adhesive material and / or the discontinuity of the adhesive should be such that the adhesive material does not negatively impact the discharging with water discharge of the adhesive. combination of cleaning cloth / disposable release liner with water discharge The adhesively bonded components can optionally be passed through a pressure point as discussed above The absorbent fibrous material of the disposable cleaning cloth / release liner combination with Water discharge of the present invention provides a cleaning surface for the cleaning cloth combination / fo Disposable release rod with water discharge. Suitable absorbent fibrous materials include any fibrous material that has sufficient integrity and strength to be used in the processes described above. Suitable absorbent fibrous materials include, but are not limited to, non-woven fabrics. Desirably, the absorbent fibrous material is a non-woven fabric comprising fibers having a fiber length of less than about 6 millimeters; however, fibers having a fiber length greater than 6 millimeters may be used as long as the fibers can easily disperse under the waste force with discharge of water from a toilet. The absorbent fibrous material can comprise synthetic polymer fibers and / or natural fibers. In one embodiment of the present invention, the absorbent fibrous material of the disposable disposable cleansing wipe combination with water discharge comprises a shaped sheet containing about 40 to 50% by weight of a water dispersible melt blown polyamide polymer. and about 60 to 50% by weight of a pulp fiber (cellulose) commercially available. Another suitable absorbent fibrous material for use in the present invention comprises a meltblown copolyester fiber, optionally containing up to 90% by weight of the commercially available pulp fiber (cellulose). A suitable absorbent fibrous material added for use in the present invention comprises an air laid sheet containing salt sensitive water sensitive binder fibers, optionally containing up to 90% by weight of commercially available pulp fiber (cellulose).

With the release characteristics and the adhesion properties, the combination properties of disposable wipe / release liner with water discharge of the present invention finds application in a variety of articles. Specifically, the combination of disposable wiping cloth / liner with water discharge of the present invention is useful in connection with a variety of products, and especially absorbent products such as sanitary napkins, incontinence devices, diapers, bandages and Similar. Although the combination of the disposable wiping cloth / liner with water discharge of the present invention finds particular use in the above-mentioned products, the concept of a combination wiper cloth / disposable release liner with water discharge has potential for any other applications where a release liner and / or cleaner is used.

Those skilled in the art will readily understand that the combination of disposable wipe / release liner with water discharge of the present invention can be advantageously employed in the preparation of a wide variety of products designed to contain at least one component having a surface of liberation. Such products may comprise only a combination of disposable release / liner cloth with water discharge or may comprise the combination of disposable release liner / co cloth with water discharge with one or more additional layers such as coatings, films, fabrics , etc. Although the combination of disposable wipe / release liner with water discharge of the present invention is particularly suitable for release liner applications, the wipe / disposable release liner combination with water discharge of the present invention may It is advantageously employed in the preparation of a wide variety of products for consumers other than the release liners and the products containing the release liner.

The present invention is further illustrated by the following examples which should not be considered in any way as imposing limitations on the scope thereof. On the contrary, it should be clearly understood what can be used for several other additions, equivalent modifications thereof, after the reading given here of the description, and which can be suggested to those experts in art without departing from the spirit of the present invention and / or the scope of the appended claims.

EXAMPLE 1 Forming a Water Sensitive Film Laminate / Release Coating A disposable release liner with water discharge was made by the following process. A release coating comprising a mixture of 30% by weight of a low molecular weight paraffin wax, VYBAR® 253 (Petrolite Polymers) and 70% by weight of a coating class polyalphadefine, REXTAC® RTE32 (US Rexene Company ), is coated on a base film comprising 80% by weight of polyethylene oxide (POLYOX®, available from Union Carbide SRN-80 Class), 15% by weight of poly (ethylene-co-acrylic acid) (PRIMACOR® 1410 available from Dow Chemical Company) and 5% by weight of surfactant (TWEEN® 20, available from ICI Chemicals). The base film has the composition mentioned above, approximately 1.2 thousandths of an inch (30.5 micrometers) thick, prepared in Huntsman Packaging (Chippawa Falls, Wisconsin) from resin pellets prepared at Planet Polyme (San Diego, California). The mixture was slit coated on a high release paper and subsequently transferred to the base film under the following conditions: tank temperature 315 ° F; rejill temperature 320 ° F; hose temperature 340 ° F; die temperature 330 ° F; and online speed 24 feet / minute. The mixture was applied to the base film to produce a final coating thickness of about 0.8 mils (20.3 microns).

The base Rexene resin itself showed good adhesion to the base film substrate, even though it was slightly sticky. When mixed with the VYBAR® additive, the adhesion with the base film substrate was improved while the coating tack was effectively suppressed.

Since the Rexene resins themselves are used as a base component in many adhesive formulas, the resulting two-layer laminate was tested for adhesion to Rexene resins. The mixture showed no adhesion to a non-mixed RTE32 coating. The mixture also showed no adhesion to other Rexene coatings, such as the REXTAC® RT2330 coating The two-layer laminate broke easily when it was kept under the water flowing smoothly from a water tap. The resulting two-layer laminate exhibited the key features required in a disposable release sheet with water discharge.

EXAMPLE 2 Formation of a Water Sensitive Film Laminate / Coating with Release The release coating material, REXTAC® RT2315, was coated onto a high release paper, using a 40 mesh grid, and subsequently transferred to a base film identical to the base film used in Example 1 under the following conditions: tank temperature 315 ° F; grid temperature 324 ° F; Manguer temperature 340 ° F; die temperature 330 ° F; grid speed 3 feet / minute; and line speed 24 feet / minute. The upper line speed facilitated the spreading of the points due to the lower temperature drop before the pressure clamping point. At a line speed of 25 feet / minute, the coalescence of the points began to occur. The average space between the dots was around 0.1 millimeters on the release paper and about 0.05 millimeters on the base film. The spacing of points was reduced by increasing the pressure of the attachment point.

The effect of shortening the speeds of the rejill and the paper was also studied. When the grid was running at a faster speed than the paper, it saw flatter points with less space between them, but the coalescence was limited. When the grid speed was slightly less than that of the paper, part of the point was pulled out like a wing in the shape of a crescent on a point, again, with little coalescence. The film is easily dispersed in the water of the key.

EXAMPLE 3 Formation of a Water Sensitive Film Laminate / Release Coating The release coating material, REXTAC® RT2535, was initially coated on a high release paper, using a 40 mesh grid, subsequently the base film used in Example 1 was transferred to an identical base film under the following conditions: tank temperature 330 ° F; grid temperature 340 ° F; hose temperature 345 ° F; temperature d matrix 350 ° F; grid speed 35 feet / minute; online speed 24 feet / minute. The points were mu separated; The average distance between the points was d around 0.25 millimeters. The pressure of the fastening point had a profound effect on the point spread. When the pressure of the clamping point was more than double, the average spacing between the points was reduced to about 0.1 millimeters on the base film, and more coalescence was observed. Increasing the coating temperatures as much as 375 ° F and decaying the coating speed n showed a significant influence on d-point spacing. The film was easily dispersed in the tap water.

EXAMPLE 4 Formation of a Water Sensitive Film Laminate / Release Coating To increase the spreadability and to reduce the stickiness of the coating, 5% by weight of a low molecular weight highly branched hydrocarbon, VYBAR® 253, was added to an RT2330 resin. The mixture was coated on a release paper and an identical base film was subsequently transferred to the base film used in Example 1 under the following conditions: tanqu temperature 335 ° F; grid temperature 345 ° F; hose temperature 345 ° F; die temperature 354 ° F; grid speed 3 feet / minutes; and line speed 24 feet / minute. The points were lengthened and a substantial coalescence occurred. The average space between the points was around 0. centimeter on the release paper and about 0. millimeter on the base film. The film is easily dispersed in the tap water.

To further reduce the separation between the points, a grid of 50 meshes was used, which has less space between the holes. The points produced with the 50-mesh grid were smaller and did not coalesce. An increased paper speed of 25 feet per minute, while line speed was maintained at 35 feet per minute resulted in a pull of points, but not in an improvement in the coalescence of the points. An increase in all temperatures by 1 degree showed no difference in point coalescence.

EXAMPLE 5 Formation of a Water Sensitive Film Laminate / Release Coating A mixture comprising 80% by weight of REXTAC® RT2730 release coating material and 20% by weight of VYBAR® 253 was coated on a high release paper, using a 40 mesh screen, and subsequently transferred to a film of base identical to the base film used in example 1 under the following conditions: tank temperature 301 ° F; grid temperature 303 ° F; hose temperature 309 ° F; die temperature 312 ° F; grid speed 35 feet / minute; and online speed 25 feet / minute. The significantly lower processing temperatures were used due to the relatively high weight percentage of VYBAR® 253. The mix had a good spreadability. The dots appeared flatter, and more coalescence was observed. The average distance between the points was around 0.1 millimeters. The coated base film was easily dispersed when exposed to a large body of water.

EXAMPLE 6 Lamination Formation of Combination Cloth Cleaner A film sensitive to coated water and a formed sheet comprising 40% by weight of meltblown polyamide fibers and water dispersible (made of a polymer, Code NP-2068, supplied by HB Fuller Company, of St. Paul, Minnesota) and 60% by weight of Weyerhauser cellulose fiber pulp were extruded with lamination to form a laminate of wiper / sensitive film combination with coated water.

Having thus described the invention, many changes and modifications will be evident for those with a skill in the art, without departing from the spirit or scope of the invention.

Claims (25)

R E I V I N D I C A C I O N S

1. A disposable laminate with discharge of agu that has release characteristics, said laminate comprises: a water-sensitive film having a first surface and a second surface, the second surface being opposite the first surface; a release coating on the first surface of the water sensitive film, wherein the coating adheres to the water sensitive film provides release characteristics to the laminate; Y a fibrous absorbent material on the second surface of the water-sensitive film.

2. The disposable laminate with water discharge as claimed in clause 1, characterized in that the water-sensitive film comprises polyethylene oxide, copolymers of polypropylene / ethylene oxide, polymethacrylic acid, copolymers of polymethacrylic acid, polyvinyl alcohol , poly (2-oxazoline), polyvinyl methyl ether, polyvinyl pyrrolidone / vinyl acetate copolymers, methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, ethyl hydroxyethyl cellulose, starch methyl ether poly (n-isopropyl acrylamide), poly N -vinyl caprolactam polyvinyl methyl oxazolidone, poly (2-isopropyl-2-oxazoline), pol (2,4-dimethyl-6-triazinyl ethylene) or a combination thereof.

3. The disposable laminate with water discharge as claimed in clause 2, characterized in that said water-sensitive film comprises polyethylene oxide, ethylene oxide / propylene oxide, polyvinyl alcohol or a combination thereof.

4. The disposable laminate with discharge of agu as claimed in clause 1, characterized in that the release coating comprises a polyolefin, or fluoropolymer, a silicone or a combination thereof.

5. The disposable laminate with water discharge as claimed in clause 4, characterized in that the release coating comprises a continuous coating.

6. The disposable laminate with water discharge as claimed in clause 4, characterized in that the release coating comprises a discontinuous coating.

7. The disposable laminate with water discharge as claimed in clause 3, characterized in that the water-sensitive film comprises polyethylene oxide and combination with poly (ethylene-co-acrylic acid).

8. The disposable laminate with water discharge as claimed in clause 1, characterized in that the absorbent fibrous material comprises a non-woven fabric.

9. The disposable laminate with water discharge as claimed in clause 8, characterized in that the absorbent fibrous material comprises a non-woven fabric selected from the group consisting of (a) a coform fabric containing about 10 to 90% by weight of meltblown polyamide fibers and about 90 to 10% by weight of cellulose pulp fibers, (b) a non-woven fabric containing about 10 to 90% by weight of meltblown copolyester fibers and around 90 to 10% by weight of cellulose pulp fibers, and (c) a fabric placed by air containing 10 to 90% by weight of salt-sensitive or water-sensitive binding fibers of about 90 to 10% by weight of cellulose pulp fibers.

10. The disposable laminate with water discharge as claimed in clause 1, characterized in that the water sensitive film has a thickness of less than about 1.0 mil (25.4 micrometers) and the release coating has a thickness of less about 0.5 mils (12.7 micrometers).

11. A combination of disposable release liner with discharge of water comprising: a film sensitive to water; a release coating on a first surface of the water sensitive film, wherein the coating adheres to the water sensitive film provides release characteristics to the combination of cleaning cloth / release liner; Ya fibrous absorbent material on a second surface of the water sensitive film opposite the first surface.

12. The combination of cleaning cloth / liner d disposable discharge with water discharge as claimed in clause 11, characterized in that the water-sensitive film comprises polyethylene oxide, copolymers d ethylene oxide / propylene oxide, polymethacrylic acid copolymers of polymethacrylic acid, polyvinyl alcohol poly (2-ethyl oxazoline), polyvinyl methyl ether, polyvinyl pyrrolidone / vinyl acetate copolymers, methyl cellulose, eti cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, ethyl hydroxyethyl cellulose, methyl ether starch, poly (n) isopropyl acrylamide), poly N-vinyl caprolactam, polyvinyl methi oxazolidone, poly (2-isopropyl-2-oxazoline), poly (2,4-dimethyl-6-trizinyl ethylene) or a combination thereof.

13. The combination of wipe / liner d disposable release with water discharge as claimed in clause 12, characterized in that the water-sensitive film comprises polyethylene oxide in combination with poly (ethylene-co-acrylic acid).

14. The combination of disposable cleaning cloth / release liner with water discharge as claimed in clause 11, characterized in that the release coating comprises a continuous coating.

15. The combination of disposable cleaning cloth / release liner with water discharge as claimed in clause 11, characterized in that the release coating comprises a discontinuous coating.

16. The combination of disposable wiping cloth / release liner with water discharge as claimed in clause 11, characterized in that the absorbent fibrous material comprises a non-woven fabric.

17. A product that includes: a disposable laminate with water discharge, e where the disposable laminate with water discharge comprises: a film sensitive to water; a release coating on a surface of the water sensitive film, wherein the coating adheres to the water sensitive film provides release characteristics to the laminate; Y a fibrous absorbent material on a second surface of the water sensitive film opposite the first surface; Y at least one additional layer adhered to the release coating of the laminate.

18. The product as claimed in clause 17, characterized in that said product comprises a feminine towel, a panty liner, an incontinence device, a bandage or a diaper.

19. A method for making a disposable laminate with water discharge having release characteristics said method comprises: coating a release material on a first surface of a water sensitive film, wherein the release material adheres to the water sensitive film and provides release characteristics to the laminate; Y attaching a fibrous absorbent material to a second surface of the water sensitive film opposite the first surface.

20. The method as claimed in clause 19, characterized in that the coating step precedes the joining step.

21. The method as claimed in clause 19, characterized in that the joining step precedes the coating step.

22. The method as claimed in clause 19, characterized in that the coating step and the joining step occur simultaneously.

23. The method as claimed in clause 22, characterized in that the release material and the water-sensitive film are coextruded and the absorbent fiber material is laminated by extrusion to a surface of a water-sensitive film.

24. The method as claimed in clause 19, characterized in that the water sensitive film is a film material comprising polyethylene oxide copolymers of ethylene oxide / propylene oxide, polymethacrylic acid, copolymers of methacrylic acid, polyvinyl alcohol, poly (2-ethyl oxazoline), polyvinyl methyl ether copolymers of polyvinyl pyrrolidone / vinyl acetate, methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, ethyl hydroxyethyl cellulose, starch methyl ether, poly (n-isopropyl acrylamide), poly N-vinyl caprolactam, polyvinyl methyl oxazolidone, poly (2-isopropyl-2-oxazoline), poly (2, -dimethyl-6-triazinyl ethylene) or a combination thereof .

25. The method as claimed in clause 19, characterized in that the release material is coated on the water sensitive film by extrusion coating, hot melt slot coating or grid printing. SUMMARY The present invention is directed to a combination of disposable cleaning cloth / release liner with water discharge. The combination of disposable release liner with water discharge is formed by applying a release coating on a first surface of a water-sensitive film and an absorbent fiber material on an opposite surface of the water-sensitive film. The combination of disposable cleaning cloth / release liner with water discharge maintains its integrity integrity when in use, but loses its integrity resistance when placed in contact with water. L cleansing cloth / disposable release liner combination co water discharge is quickly broken and dispersed in a lavab or waste toilet with water discharge to force the water flowing over the combination of 1cloth cloth / liner. In addition, the present invention is directed to methods for making a disposable release cloth / liner combination with water discharge and water dispersible products, including disposable products, which contain the combination of disposable cleaning cloth / release liner with water discharge.