JP2003503249A - Sticky notes - Google Patents

Abstract

(57) [Summary] The present invention comprises a plurality of sheets each having a writable top surface (10A, 11A), a bottom surface (10B, 11B), and a side edge portion (10C, 11C), which are detachably adhered to each other. A sticky note (1) comprising a piece of paper and a backing sheet, the bottom surface of which is less than 100 μm thick, measured according to DIN 53.375-B on a stainless steel surface with a static friction load of 200 g. The coefficient of static friction is at least 1 and the FINAT test Method no. The present invention relates to a sticky note that exposes and carries a slip resistant layer having a 90 ° peel adhesive strength of less than 0.1 N / 1.27 cm as measured according to No. 2.

Description

Detailed Description of the Invention

FIELD OF THE INVENTION The present invention includes a plurality of pieces of paper and a mount that are essentially the same size and are removably bonded to each other, with the front of each of the plurality of pieces of paper being writable. The present invention relates to a sticky note provided with means for suppressing lateral movement with respect to a supporting surface located below the sticky note.

BACKGROUND OF THE INVENTION Sticky notes, which include a sheet of paper and a sheet of paper that are available in various formats such as rectangular, square, or otherwise, are commonly used for office and personal use. The plurality of pieces of paper and the backing sheet are detachably adhered to each other by applying an adhesive such as a hot-melt adhesive tape strip to a part of the edge of the sticky note. Each piece of paper can be peeled from the sticky note by pulling the upper piece of paper from the sticky note and separating the bond between the adhesive edge of the top piece of paper and the adhesive edge of the next piece of paper. This type of sticky note is hereinafter referred to as an "edge-bonded" sticky note. With this kind of sticky note,
There is essentially no adhesive on each piece of paper separated from the sticky note.

In the case of other types of sticky notes, a part of the back surface of each piece of paper is usually covered with a removable pressure-sensitive adhesive layer, which joins the front surface of the next piece of sticky paper. When a piece of paper on this sticky note is pulled up from the next piece of paper, the removable pressure-sensitive adhesive layer essentially adheres to the bottom surface of the upper piece of paper and peels off with it. Since this pressure-sensitive adhesive can usually be repositioned and re-bonded, each piece of paper separated from the sticky note can be used as a glued memo. This type of sticky note is hereinafter referred to as a "glue-in" type sticky note.

[0004] Sticky notes, irrespective of the type of their specific structure, must be used frequently during conversation on the telephone, with one hand holding the handset and the other hand frequently taking notes while holding a pen. To be done. Not only in this situation, but also when the person who does not have the pen happens to be occupied, or when it is difficult to take notes with one hand and fix it with the other because the sticky note is too small. It is inconvenient that the sticky note moves or slides laterally on the desk or other supporting surface on which the sticky note is placed, which makes it difficult to write on a piece of paper on the sticky note.

St. Paul's Minnesota Mining and
Of a "glued" sticky note, which is commercially available from the Manufacturing Company as Post-it® Notes and which comprises a plurality of pieces of paper, each carrying a repositionable and re-adhesive adhesive layer, usually on a portion of its bottom surface. In this case, the problem can be dealt with by first separating the upper piece of paper from the sticky note and then applying it to a suitable smooth surface such as a document to take notes. However, this method is not direct, and is not applicable to sticky notes that are completely "edge glued" type. Moreover, there is a need for a smooth and sufficiently hard surface suitable for writing.

In the case of “sticky” sticky notes, the sticky notes can be prevented from moving laterally by removing the backing and exposing the removable adhesive layer of the bottom strip. This method is inconvenient for several reasons. Since dust and dirt adhere to the exposed adhesive layer, the bottom surface of the sticky note becomes unsightly. When the adhesive layer provided on the bottom surface of the bottom paper piece becomes dirty, it must be replaced with the next bottom paper piece. That is, a part of the sticky note must be discarded. Further, the method of preventing the lateral movement of the sticky note in this way cannot be applied to the "edge-bonded" type sticky note.

British Patent No. 2,319,213 proposes to use a large desktop sticky note to avoid the problem of lateral movement or sliding of the sticky note. Large sticky notes according to GB '213 are typically A2 paper sized, each with a sub-region or padlet that is peelable by vertical and horizontal perforations.
It includes a plurality of pieces of paper divided into (lett). British patent '21
It is disclosed that friction stability due to the large surface area of the desktop sticky note according to No. 3 can be enhanced by using a material having a high coefficient of friction and a thickness thicker than a piece of paper as a mount. Due to the large size of the sticky note according to British Patent '213, it can only be used as a desktop sticky note. When using a sticky note according to GB '213, which is completely edge-adhesive, the fixing level of the upper strip decreases as the number of pad reds peeling from the upper strip increases. Due to the high friction stability, it is difficult or impossible to move each of the desktop sticky notes according to GB '213 on the supporting surface except when writing. British Patent No. '
In order to move the desktop sticky note according to No. 213, it has to be lifted and carried to another place. On the other hand, it is very desirable to obtain a particularly small sticky note that can be easily moved on a desk or the like even when not writing and can effectively suppress lateral movement or sliding when there is pressure from a writing instrument.

In US Pat. No. 3,937,491, a non-slip material is provided that is made of a low-friction material that slides well and that has a sticky note paper support member formed at the periphery of the paper strip member as a peripheral support. This problem is addressed by disclosing a sticky note made of removable paper. The sticky note according to U.S. Pat. No. '491 also has a backing made of elastically deformable material having a high coefficient of friction, such as sponge rubber. When you make a note on a sticky note according to US Pat. No. '491, the material located in the center of the sticky note deforms and contacts the supporting surface for the sticky note, fixing it so that it does not slide laterally. To be done. When the writing instrument is released, the elastically deformable backing sheet returns to its original shape, and the sticky note paper can be easily slid laterally due to the slippery low friction frame. However, the structure disclosed in U.S. Pat. No. '491 is relatively complex and requires a thick elastically deformable layer and a slidable frame. A similar writing pad holder is disclosed in British Patent No. 2,204,830.

US Pat. No. 5,405,168 discloses a combination of a computer mouse pad and a sticky note provided with a work surface that allows both taking notes and moving a computer mouse. ing. The sticky note includes a plurality of pieces of paper optionally fixed to a base which is preferably made of rigid cardboard. However, such a base is relatively thick and it is not possible to slide the sticky note laterally when not taking notes. U.S. Pat. No. 5,876,010 is a paper strip that allows a user to take notes on a sticky note and move or peel the sticky note by including a base including a cardboard layer and a non-slip adhesive surface. Another combination of a computer mouse pad and notepaper is disclosed which allows each piece of paper to be easily stripped without tearing.

US Pat. No. 5,232,247 discloses a fill surface assist assembly adapted for use by persons with disabilities. The surface of the assembly exposes a substantially smooth layer of adhesive upon which a piece of paper can be placed. Since the surface of the adhesive removably fixes the paper piece, it is possible to prevent the paper piece from sliding in the lateral direction without damaging the paper piece. Although the assembly according to US Pat. No. 5,232,247 can be used with sticky notes, its structure is relatively complicated and not easy to handle, so that it is a basic requirement for general office and personal sticky notes. Does not meet.

French Patent No. 2,733,183 describes a reusable base for a card block including a lower layer of foam and an upper layer providing a smooth surface and a U holding the card block.
A V-shaped clip is disclosed. Due to the non-slip nature of the bottom surface of the lower layer of foam, lateral sliding of the assembly according to French '183 can be prevented. Due to the relatively complex structure disclosed in French Patent '183, it is not suitable for the production of sticky notes with disposable mounts, which are easy to handle and most commonly used for office and personal applications. The structure of French patent '183 also
The sticky note cannot be laterally slid because it contains a relatively thick foam underlayer.

British Patent No. 2,000,959 discloses a support tray for supporting a telephone and sticky notes. The exposed surface of the tray is provided with a fiber coating that mechanically engages the fiber coating on the exposed surface of the sticky note base opposite the tray. However, the practical use suitability of the sticky note according to British Patent '959 is limited, as a supporting surface must be provided that can engage the fiber coating on the base layer of the sticky note.

The problem of giving slip resistance to a sticky note when not taking notes has been repeatedly discussed in the prior art, but so far it has been practical until a solution to this problem is fully satisfactory. There is no one that meets all the requirements of. In particular,
Prior art solutions suffer from limited practical applications, cumbersome or inconvenient, complicated construction, and / or other drawbacks.

Accordingly, it is an object of the present invention to provide a sticky note which is slip resistant when not taking notes and which does not exhibit the drawbacks of conventional sticky notes or which presents only a small amount. Specifically, the object of the present invention is to: ・ Prevent slippage of the sticky note when writing, so that slip resistance is exhibited when taking notes, ・ Pressure is exerted on the sticky note with a writing instrument, etc. When not in use, the sticky note can be easily moved over the surface supporting the sticky note, is easy to handle, and is simple with no components designed for reuse. The structure was to provide sticky notes.

[0015]   Other objects of the present invention will be apparent from the following detailed description of the invention.

BRIEF DESCRIPTION OF THE INVENTION The present invention relates to a sticky note that includes a plurality of pieces of paper and a mount, each of which includes a top surface, a bottom surface and a side edge portion, and which are detachably bonded to each other. The upper surface of each of the multiple sheets can be filled in, the bottom surface of the mount has a thickness of less than 100 μm and a static friction coefficient according to DIN 53.375-B with a static friction load of 200 g on a stainless steel surface. It is at least 1, and FINAT Test Method no.
90 ° peel adhesion on steel surface when measured according to 2 is 0.1 N / 1.2
The slip resistant layer, which is less than 7 cm, is exposed.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 is a schematic perspective view showing a part of a conventional sticky note 1 having an essentially rectangular format. This sticky note contains a plurality of pieces of paper, the top piece of paper 10 and the next piece of paper 11 are shown separately, and the other pieces of paper are shown as reference numeral 15. As illustrated in the top paper strip 10 and the next paper strip 11, each paper strip has a top surface 10a and 11a, a bottom surface 10b and 11b, and side edges 10c and 11c.
There is.

Any type of paper can be used for the sticky note according to the present invention, as long as the upper surface 10a, 11a and 15a of each piece of paper can be filled. This piece of paper is usually essentially smooth on both the top and bottom surfaces, but papers with textured surfaces are also computer mice disclosed in US Pat. Nos. 5,405,168 and 5,876,010. It can be used for special applications such as pad / sticky note combinations.
The thickness of the paper suitable for use in the sticky note according to the present invention is preferably 50 μm to 200 μm, and more preferably 75 μm to 125 μm.

Although the sticky note shown in FIG. 1 is essentially in the form of a quadrangle, other shapes such as a rectangle, a circle, an ellipse, or another regular shape or irregular shape can also be used. An example of a special form is, for example, an independent design registration M9 issued to 3M Company.
704884.4 and the like.

Each piece of sticky note paper is preferably of essentially the same size, but each piece of paper may be of various sizes. In a particular embodiment, the width of the strip, which is essentially rectangular or square in shape, respectively, is increased in one or both of the major directions of the sticky note, eg one wedge-shaped edge on which printing can be applied. It is possible to obtain a sticky note having the above.

The forms and shape ranges of the sticky notes or the sticky note pieces specified above are for illustration purposes only, and other forms and shape ranges can be used.

FIG. 2 is a schematic cross-sectional view showing a sticky note 1 of “adhesive edge” type.
Part of c, 11c, and 15c and the side edge portion 20c of the mount 20 carrying the slip resistance layer 25 including the side edge portion 25c are bonded to each other by the adhesive agent 30. The adhesive 30 is a side edge 10c, 11c, 15 of the sticky note 1 as an adhesive tape strip that can be cut to some dimensions of the side edge before or after being applied to the sticky note.
It is preferably attached to each part of c, 20c and 25c. It is particularly preferred to use a hot melt adhesive which can be applied by extrusion coating or by heating after applying the hot melt adhesive strip.

FIG. 3 is a schematic cross-sectional view of the “sticky” type sticky note 1, which is detachably pressure-sensitive adhesively attached to a portion 31 of the bottom surface 10 b, 11 b and 15 b of each piece of paper in the form of a strip. The agent is coated. Each piece of paper is adhered to the upper surface 11a, 15a of the next piece of paper and the upper surface 20a of the backing sheet by the pressure sensitive adhesive portion 31 to form the sticky note 1. The pressure-sensitive adhesive portion 31 and the paper used to manufacture each piece of paper are bonded to the bottom surface 10b, 11b and 15b of each top piece of paper by the adhesive force of the adhesive portion 31 to the corresponding upper surface 11a and 15 of the lower sheet. Choose to be higher than force. If desired, the adhesive force or sticking force of the pressure sensitive adhesive to the bottom surface 10b, 11b and 15b of each piece of paper is enhanced by applying a primer to the bottom surface or bottom surface portion 31 to which the adhesive is applied, respectively. You can An example of a suitable primer is the binder material disclosed in U.S. Pat. No. 3,857,731, which provides individual holes on the surface of the substrate for holding microsphere-shaped pressure sensitive adhesives. Therefore, when peeling the paper pieces 10, 11 and 15 from the sticky note 1, the pressure-sensitive adhesive portion 31
Is peeled with the paper strip essentially without any residual pressure sensitive adhesive that adheres to the bottom surface of the paper strip and remains adhered to the top surface of the underlying paper strip.

A removable pressure sensitive adhesive can be adhered to some or all of the bottom surfaces 10b, 11b and 15b of the paper strip. 3 is a cross-sectional view of the sticky note of FIG. 1, wherein the pressure sensitive adhesive forms a strip-shaped portion 31 along one edge of the essentially rectangular sticky note of FIG. Is.

The pressure-sensitive adhesive used is detachable so that each piece of paper can be separated from the sticky note. It is preferable that the pressure-sensitive adhesive can be reattached even if the position is changed so that the paper piece peeled from the sticky note can be attached to another surface. Suitable removable and repositionable pressure sensitive adhesives are disclosed, for example, in US Pat.
, 166,152, 4,495,318, 4,598,212,
Nos. 4,786,696, 4,810,763 and 4,944,
No. 888. The glued sticky notes 1 are commercially available in various forms and colors, such as Post-it® Notes sticky notes from 3M Company.

The sticky note 1 includes a mount 20 that supports the sticky note 1, and the slip resistance layers 25 are exposed on the bottom surface 20b or a part of the bottom surface 20b. The two-layer type sheet including the mount 20 and the slip resistance layer 25 as described above is hereinafter referred to as a back sheet of the sticky note 1.

The backing paper 20 may be the same as the bottom paper piece of the sticky note 1, but this backing paper is usually selected so as to be mechanically higher in rigidity than the respective paper pieces 10, 11 and 15 of the sticky note 1. The material of the mount 20 can be selected from paper, plastic, metal foil, laminate, and the like. Paper and plastic mounts are especially preferred.

[0028] When a paper backing sheet, the paper is preferably the its weight is ^{50g / m 2 ~150g / m 2} , more preferably if ^{50g / m 2 ~130g / m 2} , the thickness thereof It is preferably 40 μm to 500 μm. The ratio of the thickness of the paper mount to the thickness of each of the sticky notes 10, 11 and 15 is preferably at least 0.8, more preferably at least 1.0, and especially at least 1.1. preferable.

In the case of a plastic mount, it is preferable to select the plastic material so that the surface can be printed. Examples of suitable plastic materials include, but are not limited to, non-oriented polypropylene, polypropylene including uniaxially oriented polypropylene and biaxially oriented polypropylene, polyethylene terephthalate, polyester, polycarbonate, polystyrene or unplasticized polyvinyl chloride. . Particularly suitable materials include polyester and biaxially oriented polypropylene. The thickness of the plastic mount is preferably 20 to 400 μm, 30
It is more preferably about 150 μm. The thickness of the plastic material and the plastic mount is preferably selected so that the mount is flexible and rigid.

[0030]   A laminate including a polymer layer applied to a piece of paper is also suitable as the mount.

The mount 20 preferably has essentially the same dimensions as the bottom piece of sticky note 1, but the mount 2
The size of 0 and the size of the bottom piece of the sticky note 1 may be different. When the size of the backing sheet exceeds the size of the bottom sheet piece as schematically shown in FIG. 4, the protruding portion of the sheet piece is appropriately used for fixing the sticky note when taking a memo, or the protruding portion has, for example, an advertisement. Further printing for the purpose can be performed. It is also possible to make the backing paper smaller than the bottom piece of sticky note paper, and in the case of sticky note paper comprising a plurality of essentially rectangular or square paper pieces, to form strips along the edges of the bottom paper piece. . If the size of the mount 20 is smaller than the size of the bottom strip, the shape of the mount must be carefully selected so as not to adversely affect the filled portion on the sticky note, especially when only a few strips remain. The size and shape ranges of the mount 20 specified above are for illustrative purposes only, and other size and shape ranges are equally applicable.

The slip resistance layer 25 is of one type selected such that the static friction coefficient of the slip resistance layer 25 exceeds 1 when measured according to DIN 53375-B on a stainless steel surface with a static friction load of 200 g. It contains the above compounds. The method of measuring the coefficient of friction is referred to in the test section below.

When the coefficient of static friction is less than 1, the sticky note 1 cannot be sufficiently slid laterally during writing. The coefficient of static friction is preferably at least 2, and more preferably at least 2.5.

The inventor further found that the peel adhesion of this slip resistant layer on stainless steel was determined by FINAT Test Method no. It has been found that it should be less than 0.1 N / 1.27 cm when measured according to 2. If the peeling adhesive strength on stainless steel exceeds 0.1 N / 1.27 cm, the sticky note paper is particularly easy to adhere to a smooth surface such as a polished desk surface, so that the sticky note paper can be used while taking notes. The sticky note cannot be easily slid on the surface of the.

The thickness of the slip resistant layer of the sticky note according to the present invention is 100 μm or less, preferably less than 75 μm, and particularly preferably less than 50 μm. Slip resistance can be achieved by mechanically rough surface (“Silicon resistance” as proposed in US Pat. No. 3,937,491).
A sticky note according to the present invention can be obtained by using a material having a sandpaper effect ") or a thick rubber foam material that is deformed when pressure is applied and is brought into close contact with each substrate to obtain slip resistance. The skid-resistant layer of ## STR3 ## depends on the inherent slip resistance of the material used for this layer. The inventor has found that, for materials that are inherently slip resistant, a theoretically very thin slip resistant layer can be used because slip resistance is a surface property rather than a bulk property. In the present invention, the upper limit of the required thickness is set to 100 μm from the technical and economical viewpoints for the convenience of processing and the mass production of disposable sticky notes. The thickness of the slip resistance layer is preferably 3 to 75 μm, more preferably 5 to 50 μm.

It is preferred to smooth the slip resistant layer according to the invention. Qualitatively smooth means
It means that there are no sharp or pointed protrusions and / or recesses on the surface of the slip resistant layer, and also the feel of the surface when touched, that is, the tactile characteristics of the coating. In other words, when you touch the coating, it feels “smooth”. Examples of smooth slip resistant layers include, for example, essentially flat slip resistant layers, which are essentially spherical protrusions, or frustoconical in shape, essentially regular and essentially Also included in this is a slip resistant layer that includes essentially blunt and / or blunt protrusions, such as protrusions that, due to their dense arrangement, make the surface appearance essentially flat for the feel of the hand. included. The smooth surface of the slip resistance layer 25 may or may not have a glossy appearance, but a glossy surface is preferred.

Slip resistant materials that meet the requirements as slip resistant layers for sticky notes according to the present invention are well known and can be selected, for example, from the group consisting of polymeric materials based on polyolefins. Examples of suitable polyolefins are, for example, olefin homopolymers such as polypropylene and especially atactic polypropylene, polyethylene and especially low density polyethylene (LDPE) or linear low density polyethylene (
LLDPE), or homopolymers of substituted olefins such as polybutene, polyvinyl acetate or polyethylene ethyl acetate, olefin copolymers such as polyethylene vinyl acetate, ethylene acrylic acid copolymers, ethylene methacrylic acid copolymers or copolymers of ethylene with other polar comonomers, and Mention may be made of polyolefin plastomers such as ethylene / 1 octene or ethylene / 1 butene copolymers obtained using metallocene catalyst systems. The slip resistance due to the polyolefin plastomer is described in, for example, J. Plastic Film Sheeti
ng, 13 (1997), pp. 142-149, it can be modified by incorporating additives such as fatty acid amides or inorganic materials such as silica. The polyolefin-based polymer material may contain a blend of the above polyolefin or a blend of one or more of the above polyolefin and another polymer. The polyolefin-based polymer material may optionally contain additives such as naphthenic oil, aliphatic oil or fatty oil, solvent, stabilizer and antioxidant.

A slip resistant material that is useful in the present invention and that meets the requirements for a slip resistant layer of a sticky note as noted above, is exemplified by ethylene propylene copolymer (EPM) or ethylene propylene diene terpolymer (EPDM). It can be further selected from the group consisting of polymeric materials based on thermoplastic elastomeric materials such as olefinic elastomers. Another suitable type of thermoplastic elastomeric material is a styrene butadiene copolymer and an ABA triblock copolymer where A is a crystalline styrene endblock and B is an amorphous polybutadiene, polyethylene butylene or polyisoprene midblock. Such as synthetic rubber is included. Other suitable thermoplastic elastomer types include, for example, uncured polyurethane elastomers and polyester elastomers. Polymeric materials based on thermoplastic elastomers may contain blends of the above thermoplastic elastomers or blends of one or more of the above thermoplastic elastomers with other polymers. Blends containing at least one polyolefin and at least one thermoplastic polymer are particularly suitable. Each such formulation or thermoplastic elastomeric polymer material may optionally contain additives such as, for example, plasticizers, solvents, UV stabilizers, antioxidants and fillers.

OREVA available from Elf Atochem of Puteaux, France
Ethylene vinyl acetate polymers such as C ^TM materials are also particularly suitable. OREVAC
The series material is an EVA terpolymer modified by the addition of polar groups,
When melted, it exhibits excellent adhesion performance on various substrates.

The use of foamed slip resistant materials such as those described in US Pat. No. 3,738,359 or EP 0,549,948 for the present invention is less preferred. US Pat. No. '359 discloses a polymer of butadiene and styrene, butadiene, for use in instruments capable of containing sticky notes and holding surgical instruments.
Elastic foams based on polymers of styrene and ethylenically unsaturated carboxylic acids are disclosed. Such foams preferably have a thickness of 40 to 150 mils, corresponding to a thickness of about 1 mm to about 3.8 mm, and thus do not meet the thickness requirements for the slip resistant layer of sticky notes according to the present invention.

When the foamed material of US Pat. No. '359 is used thinly, it becomes an open-hole material,
This is because it is difficult to obtain sufficient slip resistance because the contact area between the foam and the underlying substrate is narrowed because dust or dirt is collected in the opening holes. Not preferable.

In European Patent '948, the particle size before expansion is about 5 to about 30 μm, and Expancel (registered trademark) or F which normally expands about 5 to 10 times or more by heating.
Foams containing thermally expanded microbeads such as oamcoat® are disclosed. Thus, the thermally expandable microbeads tend to provide large numbers of protrusions in the slip resistant layer, which must be less than 100 μm thick, in excess of the thickness of the slip resistant layer, as an irregular array, and / or to provide apertures. Therefore, it is not so preferable.

The above-described slip resistant materials and methods of making the same are well known, and most of these materials are readily available. Representative thermoplastic elastomeric materials including block copolymers having crystalline styrene blocks and amorphous polyolefin blocks are described, for example, by Kraton D, Kraton G and Kraton RP in Shell Chemical Co. Available from. Suitable copolymers of olefins and polar comonomers are available from Elf Atochem in Lotryl.
(Ethylene-acrylic acid copolymer) and Evatane (ethylene-vinyl acetate copolymer), respectively. Suitable polyolefin plastomers are Dow Chemicals Co. From Affinity. Specific examples of such commercially available materials are listed in the materials section below.

The above-mentioned slip resistant materials are particularly suitable and suitable for the production of sticky notes according to the invention. However, the above-mentioned slip resistant materials are not listed for the purpose of limitation, and can be applied as a slip resistant layer for a sticky note backing, have a static friction coefficient of at least 1, and have a peel adhesion force on stainless steel of 0. .1N / 1.27c
Other slip resistant materials can be used as well provided they meet the requirement of less than m. Useful skid resistant materials are described, for example, in DE 4432298, EP 0,764,748 and US Pat. No. 4,086,388.

Those skilled in the art will apply a thin slip resistant layer to a suitable backing such as a piece of paper and the resulting paper will be conventional Post-it® Notes sticky paper (eg 3M C
Replacing the backsheet with ompany product 655, dimensions 76 mm x 127 mm) facilitates a qualitative examination of the slip resistant material for utility in the present invention. The tested slip-resistant materials were: -No substantial lateral movement was observed when the modified sticky notes were placed on a polished stainless steel surface and a note was taken-Abraded the modified sticky notes It is usually suitable for use in the present invention, provided that it can be pressed against the stainless steel surface by hand pressure for 10 seconds and then easily released on the surface when the pressure is released.

This simple qualitative test usually makes it easy to select a slip-resistant material suitable for use in the sticky notes according to the invention. Among this group of suitable slip resistant materials,
When applied as a slip resistant layer: a coefficient of static friction of less than 12, preferably 10 or less, particularly preferably 9 or less, and / or
Or, those exhibiting a T-type peel adhesion of less than 1.0 N / 1.27 cm to the self-material (that is, the second same slip resistance layer) are particularly preferable.

The inventor of the present application has found that sticky notes having conventional dimensions such as 76 mm × 127 mm cannot easily slide on the surface of a polished wooden desk or the like when the coefficient of static friction of the slip resistance layer exceeds 10. . A very small sticky note such as 38 mm × 51 mm having a static friction coefficient of 12 or less can be used, but in this case, the static friction coefficient is preferably 10 or less. Sticky notes having a coefficient of static friction of 9 or less in the slip resistant layer are particularly suitable.

The inventor of the present application has also found that sticky notes provided with a slip resistant layer having a high T-type peeling adhesive strength to the self-material prevent mutual movement when the slip resistant layers are arranged facing each other. As a result, it becomes difficult to separate the two sticky notes from each other, or one or both mounts carrying the slip resistance layer breaks or peels off.

When applied as a slip resistant layer, the T-type peeling adhesive force to the material itself is 1.0 N /
Less than 1.27 cm, more preferably less than 0.5 N / 1.27 cm,
Particularly preferred is a slip resistant material which is less than 0.1 N / 1.27 cm.

The inventor of the present invention has found that when the slip resistance material contains a synthetic rubber, the T-type peeling adhesive strength tends to be high, or the movements of them tend to be suppressed. Such a rubber-based slip resistance layer is not very preferable. However, usually
Preferably, the average diameter of the filler is selected so that the surface of the slip resistant layer does not have sharp or pointed deformation or protrusions, and the slip resistant layer contains one or more fillers such as silica or titanium dioxide. The T-type peel adhesion strength can be reduced. Suitable spherical silica fillers with an average diameter of 7-40 nm are available from Hanau D
It is commercially available from Egussa as "Aerosil".

The slip resistance layer according to the invention is preferably transparent so that the print made on the bottom surface of the mount can be read. Many of the slip resistant materials suitable for use in the present invention are transparent and will be readily selected by one of ordinary skill in the art. Examples of particularly suitable transparent materials include ethylene-based polymers such as ethylene-acrylic acid copolymers, ethylene-vinyl acetate copolymers and plastomers.

The slip resistant layer may be formed by coating a solution of the slip resistant material on the backing paper or, if there is no backing paper, evaporating the solvent, or by extruding the skid resistant material onto the backing or bottom paper piece. , Can be applied to the mount or bottom piece. Examples of solvents that are particularly suitable for solvent coating rubber-based slip resistant materials include toluene and heptane. Extrusion without solvent is preferred.

When using a plastic mount, it is especially preferred to coextrude the slip resistant material and the mount. When the coextruded product is uniaxially or biaxially stretched, the adhesion force of the slip resistant material to the coextruded mount is often increased.

By sufficiently adhering the slip resistant layer to the mount or bottom paper piece, the slip resistant layer peels off or rubs when taking notes or sliding the sticky note on the table without applying pressure. Other than this, it must be prevented from mechanically deteriorating. When a slip resistant material is solvent coated or extruded on a paper backing, the material typically partially penetrates into the open pores of the paper surface to provide a sufficiently stable bond. For paper mounts with surfaces having low density of apertures, chemical plasma can be used. In the case of polymer mounts, it is often desirable to subject the surface bearing the slip resistant layer to flame treatment, corona or plasma discharge treatment, or chemical plasma-based undercoating. An example of a chemical plasma suitable for use with a polyolefin-based polymeric material is ethylene acrylic acid copolymer.

The adhesive properties of the OREVAC ^™ series materials described above are excellent for a variety of substrates, and bond sufficiently strongly to a variety of paper substrates without the need for pretreatment of the paper substrate with a chemical primer.

The slip resistant layer was extruded as a separate film and was reprinted in US Reissue Patent No. RE 24,9.
It is also possible to apply it to the mount with an adhesive such as a permanent pressure-sensitive adhesive such as an acrylic adhesive disclosed in No. 06 or a synthetic rubber resin adhesive.

The slip resistant material can be applied so that the slip resistant layer covers all or part of the backing or bottom strip. When a partial slip resistance layer is provided, it can be applied in the form of spots or stripes by utilizing conventional screen printing, stripe coating technology and the like. The ratio of the area of the slip resistance layer to the area of the mount or bottom sheet is preferably at least 0.2, and at least 0.
3 is more preferable. It is particularly preferred if the slip-resistant layer completely covers the mount or bottom strip.

The inclusion of one or more fillers such as silica or titanium dioxide in the slip resistant material by the inventor of the present application allows the slip resistant layer to have a peel adhesion on the polished stainless steel surface and / or a T for the material itself. It is known that the mold peeling adhesive force is often lowered. The fillers useful in the present invention are such that their average diameter is preferably less than 0.8, more preferably less than 0.5, particularly preferably less than 0.1, relative to the thickness of the slip resistant layer. Select so that the surface of the slip resistant layer is not provided with sharp or pointed deformations or protrusions. The amount of the one or more fillers based on the volume of the slip resistant material used in the slip resistant layer is preferably 0 to 15% by weight, and more preferably 0 to 10% by weight.

The sticky note according to the invention has an advantageous slip resistance behavior and its own material (T-type peel adhesion).
And low adhesion performance to smooth surfaces such as a polished wood desk work surface or a polished stainless steel surface. Since the thickness of the slip resistant layer is thin and the cost of adding the slip resistant layer to the sticky note according to the present invention as compared with the conventional sticky note is in an allowable range, the sticky note paper pieces 10 and 11 are included. It is also possible to discard the backsheet when all 15 and 15 have been used up. Therefore, the sticky note according to the present invention is particularly useful as a disposable article.

The invention will be further described by the following non-limiting examples. However, first, the specific tests and procedures used in the examples are described.

Test Method T-Peel Adhesion Strength Width 10 cm, Length 15 with slip resistant surface to be evaluated for T-type Peel Adhesion.
The two cm mounts were placed facing each other. Two pieces of paper stacked on top of each other were fastened at their ends with 3M Company Tape 202, a paper masking tape. To this taped assembly, a rubber-coated manual roller was rolled to apply high pressure by hand to push air bubbles between the two slip resistant surfaces.

The two paper strip assemblies were placed between two aluminum plates (about 12 cm wide x about 25 cm long x 1 mm thick) and placed in a forced oven at 50 ° C. A weight of 500 g was placed on each end of the aluminum plate.

The test sample was kept heated in the oven for 3 days, removed and cooled. After cooling, the weight and the aluminum plate were removed. The two paper strip assemblies were placed in a controlled environment at 23 ° C. and 50% relative humidity for 30 minutes before evaluation.

From this laminate, three strips having a width of 1.27 cm and a length of about 10 cm were cut.

T-peel force was measured according to ASTM D1876-6IT. Two pieces of paper of the laminate were separated at a distance of about 2 cm at one end and both ends were placed on the jaws of a tensile tester.

Subsequently, the jaws of the tensile tester were separated at a rate of 300 mm / min. The force required to separate this stack was recorded in units of N / 1.27 cm. Two separate two paper strip assemblies were evaluated for each material and the results averaged.

90 ° Peel Adhesion 90 ° Peel Adhesion was measured using a tensile tester adapted to a special configuration to maintain a 90 ° peel angle during the test. This device configuration is based on FINAT test Method no. Which is a standard 90 ° peel test method. 2 (Federation
International des Fabricants Europe
ens et Transforms d'Adhesifs et
Thermocollants sur Papiers et autre
s Supports (available from FINAT)).

There are some points that did not comply with the described FINAT method. This is described below. 1) FINAT2 requires a glass substrate, but a stainless steel plate was used. 2) A 6 kg roller was used in place of the "standard FINAT test roller". 3) The sample was rolled twice at 300 mm / min instead of twice at 200 mm / min as required by the FINAT2 method. 4) Dwell times are 20 minutes and 2 as required by the FINAT2 method.
Essentially zero minutes instead of four hours.

A backsheet containing a backing carrying a slip resistant layer for evaluation of 90 ° peel adhesion was cut to a width of 1.27 cm. The backsheet was pressed flat against a clean, polished stainless steel plate with a 6 Kg roller at a rate of 300 mm / min, with the slip resistant layer facing the stainless steel plate.

The polished stainless steel test plate was pre-cleaned with tissue paper containing methyl ethyl ketone, then tissue paper containing a 1: 1 mixture of isopropyl alcohol and water, then again tissue paper containing methyl ethyl ketone. It was air dried.

After a dwell time of 20 minutes, the force required to peel the backsheet from the polished stainless steel plate was tested at 90 ° peel angle from the substrate.
It was measured by using a tensile tester configured so as to be maintained at.

Each mount was evaluated using three different samples and the results were averaged. The 90 ° peel adhesion was recorded in units of N / 1.27 cm.

Coefficient of Friction The coefficient of friction is calculated from the Deutsche Industrie Norm (DIN) 53.
Measured according to 375-B.

The mount carrying the slip resistance layer, which is the test object, is a 3M double-sided adhesive tape No. 4
44 was used to adhere to the surface of a 7.5 cm x 23.5 cm aluminum test plate. The size of the mount carrying the slip resistant layer is 7.5 cm × 14.5 cm,
The entire area was glued to an aluminum test plate using double-sided adhesive tape.

A slide-resistant surface was obtained by pulling a thread with a flat surface area of the same 40 cm ² (6.3 cm on a side) as the substrate material on the bottom surface on the slide-resistant layer exposed on the aluminum test plate. The frictional force with the surface of the substrate was measured. The total weight of thread and 40 cm ² test substrate was 200 g.

The following base material was used for the bottom surface of the thread. 1) 3M Tape No. 371 which is a tape for packaging that includes a biaxially oriented polypropylene film backing material having a low adhesive strength backsize containing urethane as a main component on one side and a rubber resin pressure sensitive adhesive on the other side. Non-adhesive side. DIN 53 37
Polymer foam (3M foam sheet number 344, as required by 5-B)
The thin film of 9) was placed between the tape and the bottom of the thread to improve the surface contact. 2) A stainless steel plate having an average surface roughness value R _a of 0.1 and an average peak valley value R _z of 1.0. The values R _a and R _z , which represent the roughness, are German Ettlin.
It was measured by a laser profilometer available from Gen UBM Mestechnik GmbH as model number UB-16. These roughness values are
e Industry Norm (DIN) 4768 and DIN 4762
Was calculated with this device according to. The stainless steel test plate should be
It was pre-cleaned with a tissue paper containing methyl ethyl ketone, then a tissue paper containing a 1: 1 mixture of isopropyl alcohol and water, then again a tissue paper containing methyl ethyl ketone and finally allowed to air dry.

The static friction coefficient and the dynamic friction coefficient were calculated from the friction force measured according to the following formulas. a. Static friction coefficient (μ _s ) μ _s = F _s / F _ρ b. Dynamic friction coefficient (μ _D ) μ _D = F _D / F _{ρ where} F _S = static friction force F _D = dynamic friction force F _ρ = normal force (force acting at right angles to the contacting surface)

The measurements were made by mounting the threads in a commercial tensile tester (Instron ^™ ) and pulling them on the exposed skid resistant surface at a rate of 100 mm / min for a total of about 7.5 cm. The test data was collected, and the obtained coefficient of friction was calculated by Ulm, Germany
Software package te available from Zwick GmbH & Co
stXpert (registered trademark) Version 04.96 / T-01-00 (Co
Pyright 1996).

The data used to calculate the static friction coefficient and the dynamic friction coefficient are obtained from one test. This test was repeated 5 times for each slip resistant material with 5 different samples, each equipped with a mount containing the slip resistant material. As the coefficient of static friction of each material increases, the deviation of the coefficient of friction calculated by the sample increases even for the same material. Repeating the measurement 5 times or more for a specific material gives reliable data even for a high coefficient of static friction. Using five measurements, a standard deviation of about + / = 1 was typically obtained for a coefficient of static friction of about 9.

Materials used in the examples Kraton D 1118X: Linear SBS / SB, 31% polystyrene, 7
8% diblock, Shell Chemicals to KRATON D 11
Available as 18X.

Kraton G 1652: Hydrogenated linear S-EB-S, 30% polystyrene, available from Shell Chemicals as KRATON G 1657.

Kraton G 1657: Hydrogenated linear S-EB-S / S-EB polymer, 13% polystyrene, 30% diblock, Shell Chemical.
Available as KRATON G 1657 from s.

Kraton RP 6912: S-EP-S-EP Polymer, 21% Styrene, available from Shell Chemicals as KRATON RP 6912.

KRATON D 1107: linear S-I-S / S-I, 15% polystyrene, 17% diblock, Shell Chemicals to KRATON D.
Available as 1107.

LOTRYL 30BA02: Random copolymer of ethylene (70%) and butyl acrylate (30%), melt index 1.5-2.5, mp 78 ° C., Vicat softening point 45 ° C., available from Elf Atochem.

EVATANE 28-03: Random copolymer of ethylene and vinyl acetate, ethylene (73%) and vinyl acetate (27%), melt index (g / 10 min).
= 3 to 4.5, melting point = 75 ° C., Vicat softening point = 44 ° C., Elf Atoche
Available from m.

LOTRYL 18MA02: Random copolymer of ethylene (80%) and methyl acrylate (20%), melt index 2-3 g / 10 min, melting point 87 ° C., Vicat softening point 55 ° C., available from Elf Atochem.

AFFINITY PL 1880: Polyolefin plastomer (POP) containing a copolymer of ethylene and octene, density 0.902, melting index (190 ° C./2.16 k) measured according to ISO 1133 in units of g / 10 min.
g) = 1.0, melting point 100 ° C. by DSC, Vicat softening point 87 ° C., Dow E
europe S. AFFINIT from Dow Plastics, which is part of A
Available as Y PL 1880.

AFFINITY VP 8770: Polyolefin plastomer (POP) containing a copolymer of ethylene and octene, density 0.885, melt index measured according to ISO 1133 in units of g / 10 min (190 ° C./2.16 k
g) = 1.0, melting point 74 ° C. by DSC, Vicat softening point 57 ° C., Dow Eu
rope S. Dow Plastics which is a part of A to AFFINITY
Available as VP 8770.

AFFINITY EG 8150: Polyolefin plastomer (POP) containing saturated ethylene octene copolymer, ISO 11 in units of g / 10 min.
Melting index (190 ° C / 2.16kg) = 0.5, D according to 33
Mooney viscosity (ML1 + 4/121 ° C) 35 according to IN 53523 / T1, density 0.868, Dow Europe S.M. Dow Plast which is a part of A
Available as AFFINITY EG8150 from ics.

Engage D8829 (product under development): Polyoctene ethylene (POE) based compound expanded with naphthene oil, ASTM D1238 (dg / min).
E) melt index 16, density = 0.89, Shore A hardness 35 according to ASTM D2240, available from Dupont Dow as D8829.

FINA 3374X: Film grade polypropylene homopolymer, density 0.
905, melt flow (g / 10 minutes) 2.5, melting point 163 ° C (Fina Oil
and FINA3374X from the Chemical Company).

PRIMACOR 3003: ethylene (93.5%) and acrylic acid (6
． 5%) copolymer, melt index 7.8, Vicat softening point 85 ° C. (available from Dow as PRIMACOR 3003).

PU 5632: A transparent polyurethane film bearing an acrylic pressure sensitive adhesive layer on one side (available from 3M as Product No. 5632).

Aerosil 962: Hydrophobic fumed silica (from Degussa to AE
Available as ROSIL 962).

EXAMPLES Comparative Example 1 Removable self-adhesive Post-it® Notes (3M to Prod).
A strip of repositionable pressure sensitive adhesive that is available as an oct number 655, peels the paper backsheet from 100 sheets of sticky note paper with dimensions of 76 mm x 127 mm) and is attached to the bottom of the bottom piece of sticky note paper Exposed. This sticky note was placed on the work surface of a polished wooden desk. This sticky note was lightly adhered to the work surface to prevent the sticky note from moving during use.

As a normal use process, the sticky note was moved several times and re-bonded to the work surface of the desk, and the exposed adhesive strip was soiled with dust, and when the degree of contamination became severe, the adhesive strip was removed. It no longer adhered to the work surface of the desk and could not function as a slip resistance. The bottom paper piece of the sticky note paper carrying the dirty adhesive was peeled off from the sticky note paper to expose a new adhesive surface of the paper piece located next to the sticky note paper.

90 ° peel adhesive strength, T-type peel adhesive strength, static friction coefficient and dynamic friction coefficient were measured.
This was done using the adhesive coated bottom of a single repositionable piece of paper freshly peeled from the 100-sheet sticky note described above. The results are summarized in Table 2.

Comparative Example 2 Detachable, self-adhesive Post-it® Notes (3M Company Product655, carrying a proprietary paper backsheet, Dimension 76 mm.
A sticky note of 100 sheets (× 127 mm) was placed on the work surface of a polished wooden desk, and writing was performed with one hand. The sticky note moved unless I fixed it with the other hand, making it difficult to write.

The 90 ° peel adhesion, T-peel adhesion, static coefficient of friction and dynamic coefficient of friction were measured as described above. The results are summarized in Table 2.

Example 1 A 20 micron layer of styrene-butadiene-hydrogenated styrene triblock polymer (available from Shell as KRATON 1118) was solvent coated onto a 36 μm thick sheet of corona treated polyethylene terephthalate (PET) film. Coating (Kraton in 30% / 70% toluene / heptane solvent)
1118 20% solids). The solvent was then removed by drying in a forced air oven.

Post-it® Notes (Produ) manufactured by 3M Company
The paper backsheet provided on the 100-sheet sticky note paper having a ct number of 655 and dimensions of 76 mm × 127 mm) was peeled off and replaced with the above-mentioned rubber-coated film sheet having the same dimensions as the backsheet. Adhere this new backsheet with a PET slip liner with a rubber slip resistant layer by sticking the adhesive strips on the bottom of the bottom strip of sticky note to the non-coated side of the rubber coated film backsheet. As such, it was placed in combination with a stack of adhesive paper strips. Thus, the rubber-coated side of the back sheet was used as the lowest surface of the sticky note.

The sticky notes thus formed were placed on a desk with a wooden surface. The user
It was possible to easily fill in the sticky note with the other hand without holding the sticky note in a certain position with one hand. In this way, the sticky notes could be used repeatedly and there was no tendency for dust to collect on the back surface.

Although this sticky note could be easily moved laterally on the top of the desk, it should be held firmly in a fixed position by applying pressure from above with a writing instrument to the top of the sticky note by hand. I was able to.

The physical properties of the paper piece carrying the slip resistance layer were evaluated by the methods described in the test method as described above. The test results are summarized in Table 2.

In this synthetic rubber layer, effective slip resistance behavior was obtained as shown by the measured values of the friction coefficient. The 90 ° peel adhesion from stainless steel was 0.01 N / 1.27 cm.

T-peel measurements showed that multiple KRATON 1118 layers were used to move together or block each other's movement. An attempt to separate the two layers resulted in the test structure peeling (Kraton layer separated from the film carrier).

Example 2 and Example 3 Example 1 was repeated except that different KRATON ^™ block copolymers were each provided as a slip resistant coating on the film backsheet. Specifically, hydrogenated S-EB-S polymers (from Shell to KRATON
G 1652) and hydrogenated S-EB-S / S-EB polymer (available from Shell as KRATON G 1657) were coated on a polyester film as in Example 1 and evaluated.

The backsheet structures are summarized in Table 1 and the test results are summarized in Table 2. Good slip resistance behavior and low peel adhesion were obtained from the materials used. From the T-type peeling measurement value, it can be seen that when the rubber-coated back sheet of another sticky note is brought into contact with the rubber-coated back sheet, the bonding tends to occur irreversibly over time.

Comparative Example 3 Example 1 was repeated except that the styrene-isoprene-styrene triblock polymer available as KRATON D1107 was used as the slip resistant layer. When the 90 ° peel adhesive strength was measured to be 0.15N / 1.27cm,
It turned out to be sticky.

Example 4 and Example 5 A bilayer film comprising an ethylene / butyl acrylate (EBA) copolymer layer and an ethylene / acrylic acid (EAA) copolymer layer was extruded onto paper. Two parallel single-screw extruders (Plastikmaschinenbau ED45 and Ex
Using a Trudex EN30), a multilayer die (E
Cloeren feedblock with DI die). At a line speed of about 12 m / min, the two-layer film was dropped at a distance of about 3 to 5 cm into the gap formed by the pressure-bonding roll, and this paper substrate was passed over the second cooled roll. . The EAA copolymer was contacted with the paper to act as a primer and the two layer film was extruded directly onto the paper to facilitate the adhesion of the slip resistant layer to the paper. The EBA layer was exposed and used as a slip resistance layer.

The slip resistance layer has a melting index of 1.5 to 2.5 and a melting point of 78 ° C.
Vicat softening point is 45 ° C, from Elf Atochem to LOTRYL30
Ethylene (70%) and butyl acrylate (30% available as BA02
%) Copolymer.

This EAA primer has a melt index (190 ° C./2.1 according to ISO 1133).
6 kg) is 7.8, the Vicat softening point is 85 ° C, and from Dow to PRIM
It was a random copolymer of 93.5% ethylene and 6.5% acrylic acid available as ACOR3003.

In Examples 4 and 5, the slip resistance layers having the thicknesses of 25 μm and 15 μm were provided, respectively. The EAA primer layer thickness for Examples 4 and 5 was about 10 microns.

The backsheet structures are summarized in Table 1 and their test results are summarized in Table 2. The slip resistant layers used in Examples 4 and 5 provided good slip resistance behavior, low 90 ° peel adhesion and T-type peel adhesion.

Example 6 and Example 7 Two-layer films containing ethylene / vinyl acetate (EVA) copolymer and ethylene / acrylic acid (EAA) copolymer were used in Example 4 and Example, except that the die temperature was 290 ° C. Extruded onto paper as in Example 5. This two-layer film was extruded directly onto the paper so that the EAA copolymer layer was in contact with the paper to enhance the adhesion between the paper and the EVA layer. The EVA layer was exposed and used as a slip resistance layer.

This EVA copolymer has a melt index (g / 10 min) of 3 to 4.5, a melting point of 75 ° C., a Vicat softening point of 44 ° C. and is available from Elf Atochem as EVATANE 28-03. Was a random copolymer of ethylene (73%) and vinyl acetate (27%).

The EAA basecoat was a copolymer of 6.5% acrylic acid in ethylene available from Dow as PRIMACOR 3003.

In Examples 6 and 7, a mount was provided, as summarized in Table 1, containing EVA and about 10 micron layers of EAA primer, having a thickness of 36 microns and 14 microns, respectively. The test results are summarized in Table 2. The slip resistant layers used in Examples 6 and 7 provided good slip resistance behavior and virtually zero adhesion performance.

Example 8 A bilayer film comprising an ethylene / methyl acrylate copolymer layer and a polypropylene layer was coextruded and biaxially oriented (5.5 times in the web machine direction and 9 in the web cross direction).
Doubled). The total biaxially oriented film thickness was 55 microns. A final thickness of about 10 microns, with a melt index of 2-3 g / 10 min, a melting point of 87 ° C, a Vicat softening point of 55 ° C, from Elf Atochem to LOTRYL
It was a copolymer of ethylene (80%) and methyl acrylate (20%) (EMA) available as 18MA02. About 4 of the final film thickness
5 micron was polypropylene (available as FINA 3374X).

The two-layer film thus formed was used as a back sheet for Post-it (registered trademark) Notes sticky notes. The EMA layer was positioned remote from the paper strip laminate and provided with a slip resistant layer. A polypropylene layer was provided to act as a carrier for this slip resistant layer and to provide the mount with dimensional stability.

The backsheet structure and its test results are summarized in Tables 1 and 2. The slip resistant layer used in Example 8 provided good slip resistance behavior, low 90 ° peel adhesion and T-type peel adhesion.

Example 9 and Example 10 According to the method of Example 8, additional examples of multilayer films were prepared as backsheets. A layer of low density ethylene / octene plastomer (polyolefin plastomer or POP) prepared industrially using metallocene-based catalysts was used. Each polymer was coextruded with a polypropylene layer and the resulting bilayer film was biaxially oriented as in Example 8. The slip-resistant polymers used for forming the slip-resistant layers in Examples 9 and 10 were as follows: 1) polyolefin plastomer, density 0.902 (from Dow to AFFINITY).
PL 1880), and 2) polyolefin plastomer, density 0.885 (Dow to AFFINITY).
(Available as VP 8770).

[0124] This two-layer film was used as a back sheet for sticky notes of Post-it (R) Note so that the polypropylene carrier layer was in contact with the bottom of the bottom paper piece, and the slip resistance layer was exposed.

The backsheet structure and its test results are summarized in Table 1 and Table 2, respectively. The slip resistance layers used in Examples 9 and 10 provided good slip resistance behavior, low 90 ° peel adhesion and T-type peel adhesion.

Example 11 Example 8 was repeated, except that a mixture of two polyolefin plasts was used and a slip resistant layer of a biaxially oriented bilayer oriented backsheet was provided. The composition of this slip resistant layer is such that the first polyolefin plastomer 75 has a density of 0.902.
% By weight (available from Dow as AFFINITY PL 1880) and 25% by weight of a second polyolefin plastomer with a density of 0.868 (available from Dow as AFFINITY EG 8150).

The backsheet structure and its test results are summarized in Table 1 and Table 2, respectively. The slip resistance layer used in Example 11 provided good slip resistance behavior, low 90 ° peel adhesion and T-type peel adhesion.

Example 12 Example 8 was repeated except that a mixture of two polymers was used and a slip resistant layer of an extruded biaxially oriented two layer backsheet was provided. The composition of the slip resistance layer is 50 wt% polypropylene (Fina Oil and Chemical Co.
50% by weight of polyolefin plastomer with a density of 0.868 (available from Dopan to AFFINITY EG)
8150). This polymer mixture was coextruded with polypropylene as a carrier as in Example 8.

The backsheet structure and its test results are summarized in Table 1 and Table 2, respectively. The slip resistant layer used in Example 12 provided good slip resistance behavior, low 90 ° peel adhesion and T-type peel adhesion.

Example 13 A 47 micron thick monolayer of octene / ethylene polymer (POE) mixed with naphthenic oil (available from Dupont Dow as ENGAGE D 8829) was extruded to obtain corona treated polyethylene terephthalate (PET). )
36 micron thick film. ENGAGE D 8829
Functioning as an exposed slip resistance layer, the two-layer backsheet is used for Post-i
Used as a sticky note of t (registered trademark) Notes.

The backsheet structure and its test results are summarized in Table 1 and Table 2, respectively. The slip resistant layer used in Example 13 provided good slip resistance behavior, low 90 ° peel adhesion and T-type peel adhesion.

Comparative Example 4 A transparent polyurethane film sheet bearing an acrylic pressure sensitive adhesive (available as 3M product number 5632) layer on one side was applied to Post-it® Not.
es (available as 3M product 655) glued to the exposed side of a paper backsheet of sticky notes.

[0133]   The thickness of the polyurethane layer functioning as this slip resistant layer was 860 μm.

Examples 14 to 16 In Examples 14 to 16, KRATON RP6912 (S-EP-S-
EP Polymer, 21% Styrene, Shell Chemicals to KRAT
ON RP 6912) is used to demonstrate that a slip resistant backing material can be provided with a slip resistant layer. Hydrophobic fumed silica (available from Degussa as AEROSIL 972, in an amount of 2 parts by weight per 100 parts of rubber and 10 parts by weight per 100 parts of rubber, respectively, average particle size of major particles 16 nm, inner surface B
ET region 110 ± 20 m ² / g) is added to reduce the friction coefficient and
Reduces the tendency of the KRATON RP 6912 layer to block on its own material.

[0135]   The mount structure and its test results are summarized in Table 1 and Table 2, respectively.

Example 17 Elf Ato of Puteaux, France as OREVAC ^™ 1821 1.
A 99 micron thick layer of modified ethylene vinyl acetate copolymer available from chem was extruded at 70 g / m ² directly onto 83 micron thick paper. The OREVAC series materials were EVA copolymers that were modified with the addition of polar groups and exhibited excellent adhesion performance to various substrates when melted.

The polymer adhered well to paper without the primer or special coating and improved the adhesion between the two layers. When the polymer coating was peeled off from the paper and tried to be removed, fibers were peeled off from the surface of the paper.

The backsheet structure and its test results are summarized in Tables 1 and 2. The material used provided good slip resistance behavior and low peel adhesion with no visible blocks.

[0139]

[Table 1]

[0140]

[Table 2]

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a partially disassembled sticky note 1 including an upper paper piece 10, a lower paper piece 11, a plurality of paper pieces including a stack 15 of paper pieces, and a mount 20. The upper piece of paper 10 has a top surface 10a, a bottom surface 10b and side edges 10c, and a bottom surface of the mount 20 carries a slip resistance layer 25.

FIG. 2 shows an adhesive 30 on a part of the edges 10c, 11c, 15c, 20c, 25c of the sticky note 1.
It is a schematic sectional drawing which disassembles and shows an "edge-bonding" type sticky note to which is attached.

FIG. 3 is a strip-like portion 3 of the bottom surface 10b, 11b, 15b of each of a plurality of sticky notes.
FIG. 3 is a schematic cross-sectional view showing a “paste” type sticky note having a pressure-sensitive adhesive that is attached to and detached from the adhesive tape 1 partially disassembled.

FIG. 4 is a schematic perspective view showing a partially disassembled sticky-type sticky note in which the size of the mount 20 carrying the slip resistance layer 25 exceeds the size of the bottom paper piece of the sticky note.

─────────────────────────────────────────────────── ─── Continued front page    According to the provisions of Article 184-9, Paragraph 2, Item 5 of the Patent Act, The part marked with is not posted.

Claims (11)

[Claims] 1. A sticky note comprising a plurality of pieces of paper and a mount, each of which has a top surface, a bottom surface and side edges, and which are detachably bonded to each other, wherein the top surface of each of the plurality of paper pieces is writable. The bottom surface is less than 100 μm thick and DIN 53.37 with a static friction load of 200 g on a stainless steel surface.
5-B has a coefficient of static friction of at least 1, and has a FINAT test Method no. Sticky paper bearing an exposed slip resistant layer having a 90 ° peel adhesion of less than 0.1 N / 1.27 cm as measured according to 2. 2. The sticky note according to claim 1, wherein the coefficient of static friction of the slip resistant layer is less than 9. 3. The T-type peeling adhesive force of the slip resistance layer against its own material is 0.1 N.
The sticky note according to claim 1 or 2, which is less than /1.27 cm. 4. The sticky note according to claim 1, wherein the slip resistance layer is transparent. 5. The sticky note according to claim 1, wherein the slip resistance layer is smooth. 6. The slip resistant layer comprises any one or more compounds selected from the group consisting of a polyolefin-based polymeric material and a thermoplastic elastomeric material-based material. Sticky note described in. 7. The sticky note according to claim 5, wherein the polyolefin is selected from the group consisting of olefin homopolymers, homopolymers of substituted olefins, olefin-copolymers and polyolefin plastomers. 8. The thermoplastic elastomer material is an olefinic elastomer,
The sticky note according to claim 5, wherein the sticky note is selected from the group consisting of synthetic rubber, non-curable polyurethane elastomer and polyester elastomer. 9. The mount is a paper strip or a polymer film.
The sticky note according to any one of items 1 to 8. 10. The method for producing a sticky note according to any one of claims 1 to 9, further comprising a step of extruding the slip resistant layer onto a mount which is optionally undercoated. 11. The method of claim 10, wherein the extruding step is solvent-free.
The method described in.