CA2070138A1 - Dispensing container having smooth nonabrasive antislip coating on the bottom surface thereof - Google Patents

Abstract

Abstract A dispensing container having a smooth nonabrasive antislip coating on part or all of the bottom surface thereof, which coating is composed of from about 80 to about 99 percent by weight, based on the weight of the coating, of a binder having a glass transition temperature no lower than about -30°C and from about 1 to about 20 percent by weight, based on the weight of the coating, of thermally expanded micobeads having particle sizes before expansion in the range of from about S to about 30 µm. The coating has a dry static coefficient of friction, when tested in accordance with ASTM Method 1894 against an aluminum plate having an anodized surface with a roughness of less than about 32 microinches (about 0.8 ~µm), of at least about 0.6; and a dry dynamic coefficient of friction, when tested in like manner, of at least about 0.8.

Description

~070138 DISPENSING CONTAINER HAVING SMOOTH NONABRASIVE
ANTISLIP COATING ON THE BOl~OM SURFACE THEREOF

Cross-Reference to Related Application s The smooth nonabrasive antislip coating utilized in the present invention is described and claimed in copending and commonly assigned Application Serial No. , entitled SUBSTRATE HAVING A
SMOOTH NONABRASIVE ANTISLIP COATING and filed of even date 10 in the names of Frances Joseph Kronzer, Theodore John Tyner, and John Patrick Allison.

Background of the Invention The present invention relates to a dispensing container having a smooth nonabrasive antislip coating on the bottom surface thereof. The antislip property of the coating is obtained through incorporation in the coating binder of thermally expandable microbeads.
Antislip or non-skid coatings are, of course known. For example, 20 non-skid surface compositions for paper products are disclosed in U.S.
Patent No. 4,418,111 to Carstens. The composition consists of an aqueous suspension of colloidal silica and urea. The silica typically is present at a level of from approximately 1 to 5 percent by weight and has particle sizes in the range of 10 to 150 millimicrons. A urea/silica weight ratio between 0.10 a~d slightly greater than 3.00 is most effective. The composition is applied to the paper product by, for example, spraying.

An antiskid paper with enhanced friction retention is described in U.S. Patent No. 4,980,024 to Payne et al. According to this reference, superiority in retained slide angle of antiskid paper is achieved by spraying or otherwise coating the paper with a composition of matter consisting S essentially of silica sol, glycerine, and an acrylamide homopolymer.
As illustrated by the foregoing two patents, antislip coatings for papers typically employ an inorganic material in the coating binder. Such coatings often are abrasive and, in fact, are closely related to such abrasive papers as sandpapers, emery cloths, and the like, as illustrated by the 10 references which follow.
U.S. Patent No. 2,899,288 to Barclay relates to a method of forming an abrasive sheet. Briefly, a cloth backing sheet fabricated of a thermo-plastic material is passed through a heated zone in which one face of the sheet is temporarily softened, an abrasiYe material is applied evenly over 15 the softened face, the abrasive is pressed into the softened sheet by means of a nip roil and simultaneously cooled.
U.S. Patent No. 3,166,388 to Riegger et al. relates to a sandpaper.
The sandpaper comprises a reinforced paper backing, a barrier material, a layer of making varnish, and a layer of abrasive grits embedded in the 20 making varnish. The barrier material may be in the form of a barrier layer of flexible material which only partly penetrates into one side of the backing, or it may be in the form of flexible rubbery solids which penetrate into and partially fill th~ voids in the paper backing throughout its thickness. Backings comprise a web or network of wood pulp fibers and 25 a multiplicity of relatively flexible and tough thermoplastic reinforcing members distributed substantially throughout the web in bonding relation with the wood pulp fibers.

The commercial introduction of thermally expandable microspheres a number of years ago has led to a number of different uses, some examples of which are given below.
U.S. Patent No. 4,006,273 relates to washable and dry-cleanable S raised printing on fabrics. Raised prints and graphic designs on fabrics which can safely and effectively be dry-cleaned and washed are provided by formulating a cross-linkable polymer printing medium comprising an adherent film-forming cross-linkable polymer binder in a liquid vehicle therefor about 1 to 45 weight percent thermally expandable microspheres, 10 based on the weight of the binder, applying said medium to a fabric, heating at a temperature of about 180 to 250F to expand the micro-spheres and cross-link the polymer, and then curing for about 1 minute at a temperature of about 300F. The microspheres can have diameters from about 0.5 to about 300 microns (micrometers or ~m), preferably from about 3 to 50 microns, and most preferably from about 5 to 20 microns.
U.S. Patent No. 4,044,176 to Wolinski et al. describes graphic arts media which offer raised, three-dimensional effects. A basic medium is formulated of a colorant, film-forming binder, a solvent vehicle, and thermally expandable microspheres. The microspheres are treated to preclude or inhibit solvation in the solvent vehicle by coating with a compound which is a non-solvent for the microspheres but which preferen-tially wets the surface thereof. Allyl alcohols having about 3 to 5 carbon atoms in the allcyl chain are employed. The medium is selectively applied to a substrate, dried, and heated to expand the microspheres.
Japanese Published ~pplication No. 90/76,735 relates to the manufacture of slightly rough sheets. Such sheets, useful as wall and floor coverings, leather substitutes, packaging sheets, etc., are prepared by coating thermoplastic sheets, completely or in patterns, with resins containing microencapsulated blowing agents (e.g.~ butane) and simultan-eously expanding the microcapsules and softening the resins. In an example, flame-retardant paper was coated in patterns with an acrylic polymer-PVC blend containing microencapsulated blowing agents, coated with a PVC plastisol, and heated at 225 to give a sheet with a sandy appearance.
It may be noted that microspheres which are not thermally expand-able also are known. A few applications for such microspheres are described below.
A woven polyester-backed flexible coated abrasive having microbal-loons in the backsize is described in U.S. Patent No. 4,111,667 to Adams.
The backsize is used with heavy-duty flexible coated products, particularly polyester-backed coated abrasive for use in making belts. The otherwise conventional backsize coating includes from 2 to 10 percent by weight of hollow microspheres. The coating is applied on the reverse or nonabrasive side of a woven polyester backing. The microspheres (or microbeads or microballoons) are hollow spheres of resin or glass having a diameter in the range of between 5 and 125 microns (micrometers).
U.S. Patent No. 4,543,106 to Parekh relates to a coated abrasive product containing hollow microspheres beneath the abrasive grain. The product comprises a fabric backing~ a layer of abrasive grain, and at least one layer of resin between the backing and the abrasive grain. Hollow microspheres are present and at least partly and usually entirely embedded in the resin layer. In general, the hollow microspheres comprise hollow spherical bodies which may be of glass or plastic materials such as a phenolic resin, which have diameters from about S to about 500 microns (micrometers) and an average diameter of from about 25 to about 125 microns. The microspheres generally have a shell thickness which averages from about 5 to about 20 percent of the diameter of the microspheres. The microspheres usually are incorporated into the resin layer in an amount of 5 from about 5 to about 20 percent by weight of the resin layer.
A reference which does not fit in any of the foregoing categories is included for the sake of completeness. That reference is U.S. Patent No.
5,001,106 to Egashira et al., which relates to an image-receiving sheet.
Such sheet comprises a base sheet and a receiving layer, provided on one 10 surface of the base sheet, for receiving a dye or pigment migrating from a heat transfer sheet. The base sheet comprises one or two or more layers, with at least one layer having a porous or foamed structure. A layer having a porous or foamed structure can be obtained by such methods as:
(a) stretching a film prepared from a thermoplastic resin and containing fine 15 inorganic or organic particles, (b) extruding an organic solvent solution of a synthetic resin into a coagulating bath, and (c) extruding a resin together with a foaming agent. Under certain circumstances, it is desireable to roughen at least a part of both front and back surfaces of the image-receiving sheet, e.g., the non-image portion of the receiving surface or the 20 back surface of the image-receiving sheet, by imparting fine unevenness thereto.
References relating to the microbeads themselves include those described below.
U.S. Patent No. 3,615,972 to Morehouse, Jr. et al. describes 25 expansible thermoplastic polymer particles containing volatile fluid foaming agent and a method of foaming the same. Thermoplastic microspheres are prepared which encapsulate a liquid blowing agent. Heating of the microspheres causes expansion. The microspheres are useful for coatings, moldings, plastic smoke9 etc.
Polymer foam compositions are described in U.S. Patent No.
3,864,181 to Wolinski et al. The patent describes a composition and 5 method for forming foamed polymers. The composition comprises a dispersion of microspheres in a solution of the polymer in a solvent. The compositions are applied to a substrate, dried, and heated to expand the microspheres, thus forming a foamed polymer. The particular surface characteristics of foamed polymers are stated to have been utilized in non-10 skid coatings for carpets, rugs, bathtub mats, flooring, coat hangers,handles for tools and athletic equipment, and the like.
U.S. Patent No. 4,722,943 to Melber et al. relates to a composition and process for drying and expanding microspheres. Microsphere wet cake is mixed with a processing aid effective to prevent agglomeration and 15 surface bonding of the microspheres, and thereafter removing water by drying with continuous mixing, optionally also under reduced pressure, i.e., vacuum drying. By the control of the application of heat and balancing temperature and the mixing, and optionally also the reduced pressure, it is possible to also control expansion of the microspheres from 20 substantially none to substantially theoretical limits of expansion. Suitable processing aids include, by way of example, dry inorganic pigments or filler materials and the like, and related organic materials. See also U.S.
Patent Nos. 4,829,094 to Melber et al. and 4,843,104 to Melber et al.

Summary of the Invention It therefore is an object of the present invention to provide a dispensing container having a smooth nonabrasive antislip coating on part 5or all of the bottom surface thereof.
This and other objects will be apparent to one having ordinary skill in the art from a consideration of the specification and claims which follow.
Accordingly, the present invention provides a dispensing container having a smooth nonabrasive antislip coating on part or all of the bottom 10surface thereof, which coating:
A. is comprised of from about 80 to about 99 percent by weight, based on the weight of the coating, of a binder having a glass transition temperature no lower than about -30C and from about 1 to about 20 percent by weight, 15based on the weight of the coating, of thermally expanded microbeads having particle sizes before expansion in the range of from about 5 to about 30 ~m;
B. has a dry static coefficient of friction, when tested in accordance with ASTM method 1894 against an alumi-20num plate having an anodized surface with a roughness of less than about 0.8 ~m, of at least about 0.6; and C. has a dry dynamic coefficient of ~riction, when tested in accordance with ASTM method 1894 against an alumi-num plate having an anodized surface with a roughness 25of less than about 0.8 ~m, of at least about 0.8.
The unique smooth and nonabrasive coating employed in the present invention permits placing the containers on any surface, including furniture.

Detailed Description of the In~rention As use herein, the term "smooth" refers to the absence of sharp or angular particles in the nonabrasive antislip coating utilized in the present S invention. Rather, such coating contains smooth, e.g., spherical, micro-spheres. The term also refers to the feel of the surface when touched, i.e., to the tactile characteristics of the coating. That is, the coating feels "smooth" to the touch.
The term "dispensing container" is meant to include any dispensing 10 container which is intended to be placed on an essentially horizontal surfaceand remain essentially portable or moveable. Thus, the term excludes wall-mounted containers and any other dispensing containers which are mounted or otherwise fixed in a stationary position. The dispensing container most often will be a free-standing tissue or wipe dispenser.
The term "bottom surface" refers to the bottom, external surface of the dispensing container, i.e., the surface of the dispensing container which comes in contact with the surface upon which the dispensing container is placed.
The material from which the dispensing container is made is not 20 known to be critical. As a practical matter, however, the container most often will be constructed from a cellulosic material, such as paper or cardboard.
The smooth nonabrasive antislip coating can be applied directly to the bottom surface of the dispensing container either during or after its 25 manufacture. Alte~natively, the coating can be applied to the first surface of a paper substrate having a contact adhesive protected by a release paper on the second surface. In this case, the coated paper can be applied to the dispensing container as part of the manufacturing process or by the consumer. Because a coated paper is more easily tested, such a paper was the focus of the work described hereinafter.
The percentage of the bottom surface to be coated is not known to 5 be critical. Of course, the maximum antislip effect will be achieved when all of the bottom surface is coated. Coating only part of the bottom surface in many cases will give adequate antislip characteristics to the container, especially when heavier containers are involved. Conversely, small containers which generally are lighter preferably will have coating on the 10 entire bottom surface.
When the coating is applied to a cellulosic sheet, the nature of the cellulosic sheet is not kI~Owh to be critical, provided it has sufficient strength for handling, coating, sheeting, and/or other operations associated with its manufacture. In preferred embodiments, the sheet will b~ a latex-15 impregnated paper. By way of illustration, a preferred paper is a waterleaf sheet of wood pulp fibers impregnated with a reactive acrylic polymer latex such as Rhoplex0 B-15 (Rohm and Haas Company, Philadelphia, Penrlsylvania). However, ~ny of a number of other latexes can be used, if desired, some examples of which are summarized in Table I, below.
Table I
Suitable Latexes for Base Sheet Polymer Tvpe Product Identification Polyacrylates Hycar0 26083, 26Q84, 26120, 261~)4, 26106, 26322 B. F. Goodrich Company Cleveland, Ohio Rhoplex0 HA-8, HA-12, NW-1715 Rohm and Haas Company Philadelphia, Pennsylvania Carboset0 XL-52 B. F. Goodrich Company Cleveland, Ohio Styrene-butadiene copolymers Butofan0 4262 BASF Corporation Sarnia, Ontario, Canada DL-219, DL-283 Dow Chemical Company Midland, Michigan Ethylene-vinyl acetate copolymers Dur-O-Set0 E-666, E-646, E-669 National Starch & Chemical Co.
Bridgewater, New Jersey Nitrile rubbers Hycar0 1572, 1577, 1570 x 55 B. F. Goodrich Company Cleveland, Ohio Poly~vinyl chloride) Geon0 552 B. F. Goodrich Company Cleveland, Ohio Poly(vinyl acetate) Vinac0 XX-210 Air Products and Chemicals, Inc.
Napierville, Illinois Ethylene-acrylate copolymers Michem0 Prime 4990 Michelman, Inc.
Cincinnati, Ohio Adcote0 56220 Morton Thiokol, Inc.
Chicago, Illinois 207013~

The impregnating dispersion typically also will contain clay and a delustrant such as titanium dioxide. Typical amounts of these two materials are 16 parts and 4 parts, respectively, per 100 parts of polymer on a dry weight basis. An especially preferred paper has a basis weight of 13.3 lbs/1300 ft2 (50 g/m2) before impregnation. The impregnated paper preferably contains 18 parts impregnating solids per 100 parts fiber by weight, and has a basis weight of 15.6 lbs/1300 ft2 (58 g/m2), both on a dry weight basis. A suitable caliper is 3.8 mils + 0.3 mil (97 + 8 micro-meters).
Such a paper is readily prepared by methods which are well known to those having ordinary skill in the art. In addition, paper-impregnating techniques also are well known to those having ordinary skill in the art.
Typically, a paper is exposed to an excess of impregnating dispersion, run through a nip, and dried.
- 15 Turning now to the smooth antislip coating, such coating, regardless of the substrate, is comprised of from about 80 to about 99 percent by dry weight, based on the dry weight of the coating, of a binder having a glass transition temperature no lower than about -30C and from about 1 to about 20 percent by dry weight, based on the dry weight of the coating, of thermally expanded microbeads having particle sizes before expansion in the range of from about 5 to about 30 ~m. In addition, such coating must have a dry static coefficient of friction, when tested in accordance with ASTM Method 1894 against an aluminum plate having an anodized surface with a roughness of less than about 32 microinches (about 0.8 ~m), of at least about 0.6, and a dry dynamic coefficient of friction, when similarly tested7 of at least about 0.8.

Generally, the binder can be any of the known binders which commonly are used as the basis of coatings on paper and other substrates, provided the binder has a glass transition temperature no lower than about -30C. It should be noted that binders having glass transition temperatures 5 below ambient temperatures but no lower than about -30C can yield coatings which are somewhat tacky at ambient temperatures. Although such binders still can be used, some applications may require the use of a release coating or a release paper in order to prevent the coating from sticking or adhering to the reverse side of the substrate, particularly when 10 the substrate is to be manufactured, stored, and/or transported in roll form.However, the use of a release coating or a release paper can be obviated by using binders having glass transition temperatures no lower than about 15C, preferably no lower than about ~5C.
The binder in general will constitute from about 80 to about 99 15 percent by dry wei ht, based on the dry weight of the coating, of the coating. As used herein, however, the term "binder" is meant to be sufficiently broad to include minor amounts of other materials, such as dyes, colorants, pigments, plasticizers, flow agents, antistatic agents, extenders, water repellents, surfactants, viscosity control agents, dispersing 20 aids, and the like. Preferably, the amount of binder present will be in the range of from about 85 to about 95 percent by dry weight, based on the dry weight of the coating. The most preferred amount of binder is from about 88 to about 92 percent by dry weight.
The co~ting also contains from about 1 to about 20 percent by dry 25 weight, based on the dry weight of the coating, of thermally expanded microbeads. The amount of such microbeads preferably is in the range of from about 5 to about 15 percent by dry weight, and most preferably is in the range of from about 8 to about 12 percent by dry weight.
In general, the thermally expanded microbeads can be any of the commercially available microbeads, such as those sold under the Expancel~
5 trademark by Nobel Industries Sweden, Sundsvall, Sweden, and those sold under the Foamcoat0 trademark by Pierce & Stevens Corporation, Buffalo, New York. While any of the various types of thermally expandable microbeads can be employed, the more heat-resistant microbeads are preferred.
The level of coating on a given substrate typically can range from about 3.7 to about 11.5 g/m2. The preferred range is from about 5.6 to about 9.4 g/mt. It is neither necessary nor required, though, that the coating cover all of the bottom surface of the dispensing container.
As already stated, the coating must have a dry static coefficient of friction, when tested in accordance with ASTM Method 1894 against an aluminum plate having an anodized surface with a roughness of less than about 32 microinches (less than about 0.8 llm), of at least about 0.6, and a dry dynamic coefficient of friction, when similarly tested, of at least about 0.8.
Coefficients of friction were determined in accordance with ASTM
Method 1894 with a Model 1122 Instron Testing Machine (Instron Corporation, Canton, Massachusetts). Each sample tested was a 2.5-inch (6.~cm) square. Dry samples of coated substrates were conditioned for 24 hours at 50 percent relative humidity and 22C. Wet samples were soaked in 2 g of distilled water for 48 hours. Before testing, the water on the bottom surface, i.e., the surface not having the smooth nonabrasive antislip coating of the present invention, was removed by gentle blotting. The surface used to determine the coefficients of friction was an aluminum plate supplied by Instron having a clear anodized surface with a roughness of less than 32 microinches (less than about 0.8 ~m).
The present invention is further illustrated by the examples which 5 follow. Such examples, however, are not to be construed as in any way limiting either the spirit or scope of the present invention. In the examples, all parts are parts on a dry weight basis, unless stated otherwise.

Examples 1-24 Preparation of Coated Papers Because of the convenience in handling, coating, and testing papers, as already noted, all of the examples employed paper substrates. Three di~ferent papers were employed and are described below.
15 Paper A
Paper A was a standard latex-impregnated paper. The basis weight of the paper before impregnation was 52.6 g/m2. The latex saturant consisted of 100 parts of Butofan~ 4262, a styrene-but~diene rubber (BASF
Corporation, Sarnia, Ontario, Canada), 30 parts of clay, 2 parts of a 20 colloidal stabilizer, 1 part of a water repellant, and 14 parts of a colorant(the same colorant was used in all saturant and antislip coating dispersions used in the e~amples). The saturant level in the paper on a dry weight basis was 26 parts per 100 parts of wood pulp fiber.
A barrier coating was applied to one surface of the paper (referred 25 to herein ~or convenience as the second surface). The barrier coating was a dispersion which consisted of, on a dry weight basis, l00 parts of Styronal~ 4574, also a styrene-butadiene rubber (I~ASF, Sarnia, Ontario, 2070~38 Canada), 57.5 parts of Hycar0 2600x106, an acrylic polymer (B. F.
Goodrich Company, Cleveland, Ohio), and 30 parts of clay. The barrier coating latex was applied with a Meyer rod to provide a coating weight of 15-17 g/m2.
S Paper B
This paper also was a standard latex-impregnated paper. The basis weight of the paper before impregnation was 52.6 g/m2. The latex saturant was the same as that used for Paper A, except that the colorant level was 10. The saturant level in the paper on a dry weight basis was 38 parts per 10 100 parts of wood pulp fiber. A barrier was applied to the second surface as described for Paper A.
Paper C
The paper was a standard latex-impregnated paper having a basis weight before impregnation of 52.6 g/m2. The latex saturant consisted of 100 parts of Hycar0 1562, an acrylonitrile-butadiene rubber (B. F.
Goodrich Company, Cleveland, Ohio), 4 parts of a phenolic resin, 30 parts of clay, 1.5 parts of a water repellant, and 9.28 parts of a colorant. The saturant level in the paper on a dry weight basis was 38 parts per 100 parts of wood pulp fiber. The paper had the barrier coating of Paper A on the 20 second surface.
With the exception of Example 1 in which the first surface of the paper substrate was uncoated, the first surface of the paper substrate was coated with an antislip or control coating by means of a Meyer rod. The coating was applied in each case at a level of 8.3-9.4 g/m2, on a dry weight 25 basis, except for Examples 20-22, inclusive. The basis weights of the coatings emplo~ed in ~xamples 20-22, inclusive, were 5.6, 8.5, and 16.2 g/m2, respectively~ Each antislip coating of the present invention was dried for one minute at about 107C and then was heated for 10-15 seconds at 165C to expand the microbeads. Both the drying and expanding steps were carried out in a forced air oven. Coatings not containing thermally expandable microbeads were simply dried at 107C. The compositions of 5 the dispersions, on a dry weight basis, which were employed to prepare the various antislip and control coatings tested are summarized in Tables 2-5, inclusive. In general, the dispersions contained about 45 percent by weight solids, based on the total weight of the dispersion, with the remainder being water.
Table 2 Summary of Dispersion Compositions for Coatings A-F

Parts by Dry Wei~ht in Coating Com~onent A B C D E F
Rhoplex~ HA16 lOO --- --- lOO --- ---Styronal0 NI)846 - lOO --- --- --- ---Butofan0 4262 --- 50 --- --- --- ---Rhoplex~9 B-15 --- --- --- --- lOO ---Michem0 4983 --- --- --- --- --- lOO
Styronal0 4574 --- --- lOO --- --- ---Diatomaceous earth 47 55.6 --- --- --- ---Clay 57 --- --- --- --- ---Water repellant --- 11.35 --- --- --- ---Expancel0 051WU --- --- 15 15 15 15 Colorant 3 3 3 3 3 3 Table 3 Summary of Dispersion Compositions for Antislip Coatings ~L

Parts by Weight in Coatin~
Component G H I J K L
Michem~ 4983 100 100 100 100 100 100 Expancel~ OSlWU 15 15 --- 5 30 60 Rosin soap 2 --- --- --- --- ---Potassium oleate --- 2 --- --- --- ---Colorant 3 3 3 3 3 3 Table 4 Summary of Dispersion Compositions for Antislip Coatings M-R

Parts by Wei~ht in Coatin~
Com~onent M N O P Q R
Rhople~ HA16 --- --- --- 100 --- ---Styronal~ ND846 --- 50 100 --- --- ---Rhople~9 B-15 --- --- --- --- 100 ---Styronal0 4574 100 50 --- --- --- 100 Expancel0 O51WU 15 15 15 --- --- ---Colorant 3 3 3 --- ---2n70l38 Table 5 Summary of Dispersion Compositions for Antislip Coatings ~V

Parts by Wt.
in Coating Component S T
Styronal0 ND846 50 100 Expancel~ 051WU 15 15 Twenty-four different types of sheets were tested, with each type constituting an e~ample. Examples 1-9, inclusive, constituted controls.
Example 1 consisted simply of an uncoated sheet. Examples 2 and 3 utilized antislip coatings containing inorganic particles. The remaining 15 controls involved the use of various binders without thermally expandable microbeads being present. Examples 1~24, inclusive, all had an antislip coating coming within the scope of the present invention. Table 6 summarizes the combination of paper and coating composition for each example.
Table 6 Summary of Paper and Coating Compositions Employed in the Examples Exam~le Paper Coatin~
C ---S C T

g C Q
C C~

C L

C O

Wet and dry static and dynamic coeff~cients of friction were 25 determined for the sheets o'otained from the examples. It was obserYed, however, that the curves for the dry dynamic coefficient of friction tests with the sheets of Examples 8, 9, 10, 11, 16, 17, and 24 were noncontinu-2~7~138 ous. Thus, the dry dynamic values in such instances essentially were averages of a series of static coefficient of friction cunes and, as a consequence, may be less reliable. The results are summarized in Table 7.
s Table 7 Coef~lcient of Friction (COF~ Results Statie COF Dynamic COF
E~ample Dry Wet Dry Wet 0.220 1.701 0.299 1.701 2 0.169 0.680 0.17S 0.675 3 0.254 0.655 0.275 0.750 4 0.575 1.694 0.277 1.319 lS S 0.399 0.401 0.320 0.654 6 0.387 0.618 0.296 0.657 7 0.626 1.009 0.388 1.250 8 3.103 2.660 0.910 1.842 9 2.028 1.270 1.600 1.295 1.313 0.727 1.763 0.838 11 1.967 0.651 2.750 0.788 12 1.729 1.538 2.074 1.731 13 1.688 1.408 2.000 1.242 14 1.900 1.115 2.004 1.288 lS 1.575 1.144 1.674 1.350 16 0.717 1.710 1.217 1.926 17 1.569 1.329 1.781 1.349 18 1.938 0.938 2.269 0.909 19 1.650 1.044 1.994 1.110 ~.002 1.015 1.291 1.213 21 0.825 1.053 1.131 1.282 22 0.616 1.168 0.821 1.333 23 1.161 1.424 1.265 1.679 24 1.602 2.059 1.454 1.997 In order to aid in understanding and differentiating the coefficient of 10 friction data presented in Table 7, two different calculations were made, i.e., COFW - COFD and COFW + COF", in which coefficient of friction is abbreviated as COF with the subscript "W" or "D" to represent a wet or dry coefficient of friction, respectively. The results of these calculations are summarized in Tables 8 and 9.

Table 8 Summary of Calculations with Static Coefficient of Friction Data Static COF Calculations ~cam~le Wet - DryWet + Dry 1.48 1.92 2 0.51 0.85 3 0.40 0.91 4 1.12 2.27 0.00 0.80 6 0.23 1.00 7 0.38 1.64 8 -0.44 5.76 9 ~.76 3.30 ~.59 2.04 11 -1.32 2.62 12 -0.19 3.27 13 ~.28 3.10 14 -0.78 3.02 ~.43 2.72 16 0.99 2.43 17 -0.24 2.90 18 -1.00 2.88 19 ~.61 2.69 0.01 2.02 21 0.23 1.88 22 0.55 1.78 23 0.26 2.58 24 0.46 3.66 Table 9 Summary of Calculations with Dynan~ic Coefficient of Friction Data Dynamic COF Calculations E~am~le yy~ Wet + Dry 1.40 2.00 2 0.50 0.85 3 0.48 1.02 4 1.04 1.60 0.33 0.97 6 0.36 0.95 7 0.86 1.64 8 0.93 2.75 9 -0.3~ 2.90 -0.92 2.60 11 -1.96 3.54 12 -0.34 3.80 13 -0.76 3.24 14 -0.72 3.29 -0.32 3.02 16 0.71 3.14 17 ~.43 3.13 18 -1.36 3.18 19 -~.88 3.10 -0.08 2.50 21 0.15 2.41 22 0.51 2.15 23 0.41 2.94 24 0.54 3.45 Based on ~he data in Table 8, several conclusions are possible. First, 25 the difference between the wet and dry static coefficients of friction, i.e., COFW - COFD, preferably is in the range of from about -1.5 to about 1.
Second, the sum of the wet and dry static coefficients of friction, i.e., COFW + COFD, preferably is in the range of from about 1.7 to about 3.8.
Second, if the difference between the wet and dry static coefficients of friction, i.e., COFW - COFD, is less than -0.4 and greater than -1.0, then the sum of the wet and dry static coefficients of friction, i.e., COFW +

5 COFD, preferably is equal to or less than about 3Ø Third, if the difference between the wet and dry static coefficients of friction, i.e., COFW - COFD, is greater than O and less than 1.0, then the sum of the wet and dry static coefficients of friction, i.e., COPw + COFD, preferably is greater than about 1.7 Example 25 Application of Coating to Dispensing Container The paper of Example 11 was applied to bottom surface of a 15 dispenser-size, Pop-Up0 Space-Saver0 Signal0 Box of Kleenex~9 Brand facial tissues. The bottom of the container measured 4.75 by 9.5 inches (12.1 by 24.1 cm~. The paper of Example 11 was cut into two strips, each of which was 1.5 inches (3.8 cm) wide and 5.5 inches (14 cm~ long. The strips were affixed with rubber cement along the front and rear edges of the 20 bottom surface of the Kleenex0 Box. Each strip was centered on each edge, with the front edge of the front strip being contiguous with the front edge of the boKom surface. Similarly, the rear edge of the rear strip was contiguous with the rear edge of the bottom surface.
The Kleenex3 Box exhibited a significantly reduced tendency to slip 25 during use when placed on a polished wood surface.

2~7~138 Having thus described the invention, numerous changes and modifications thereof will be readily apparent to those having ordinary skill in the art without departing from the spirit or scope of the invention.

Claims (7)

1. A dispensing container having a smooth nonabrasive antislip coating on part or all of the bottom surface thereof, which coating:
A. is comprised of from about 80 to about 99 percent by weight, based on the weight of the coating, of a binder having a glass transition temperature no lower than about -30°C and from about 1 to about 20 percent by weight, based on the weight of the coating, of thermally expanded microbeads having particle sizes before expansion in the range of from about 5 to about 30 µm;
B. has a dry static coefficient of friction, when tested in accordance with ASTM method 1894 against an alumi-num plate having an anodized surface with a roughness of less than about 0.8 µm,of at least about o.6;and C. has a dry dynamic coefficient of friction, when tested in accordance with ASTM method 1894 against an alumi-num plate having an anodized surface with a roughness of less than about 0.8 µm of at least about 0.8.

2. The dispensing container of claim 1, in which said binder has a glass transition temperature no lower than about 15°C.

3. The dispensing container of claim 1, in which said binder has a glass transition temperature no lower than about 25°C

4. The dispensing container of claim 1, in which the static coefficients of friction of said coating are such that COFw - is in the range of from about -1.5 to about 1.

5. The dispensing container of claim 1, in which the dynamic coefficients of friction of said coating are such that COFW + COFD is in the range of from about 1.7 to about 3.8.

6. The dispensing container of claim 4, in which the static coefficients of friction of said coating are such that, if COFW - COFD is less than -0.4 and greater than -1.0, then COFw + COFD is equal to or less than about 3Ø

7. The dispensing container of claim 4, in which the static coefficients of friction of said coating are such that, if COFW - COFD is greater than 0 and less than 1.0, then COFW + COFD is greater than about 1.7