JPH11300900A - In-line method for laminating silicone-coated polyester film to paper, and laminate produced thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-layered sheet product useful as a release backing for pressure sensitive adhesive labels or as a liner for foodstuff containers and trays. SOLUTION: A multi-layered product is composed by a polymeric layer and a cellurosic layer laminated thereon, and an adhesive layer therebetween. A substantially uniform silicone coating is provided on a surface of the polymeric layer opposite to the surface adhered to the cellurosic layer. A smooth surface is formed on the silicone coating surface of the polymeric layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a multi-layer sheet product useful as a peelable backing paper for pressure-sensitive adhesive labels and as a liner for containers and trays used in the food and industrial compounding materials industries. It relates to a method of manufacturing. The invention also relates to a multilayer sheet product produced by such a method.

[0002]

BACKGROUND OF THE INVENTION Pressure sensitive adhesive labels have a release backing paper known as a backing layer, release layer, or release liner. This backing will be used until the label is ready for use.
Protects the adhesive surface of the label from dust, debris, moisture, and other contaminants. When peeling the backing paper from the label, it is important as the properties of the backing paper that the backing paper can be easily peeled without breakage. Furthermore, it is necessary that the label be easy to peel in order to keep the adhesive layer of the label intact during peeling and then to exert the maximum adhesive strength of the label at the time of sticking.

[0003] Silicone coated paper products are well known as release liners, release backing papers, and other suitable materials for forming low surface energy surfaces. However, such a material is not suitable as a moisture-proof and water-proof material, and needs to be increased in thickness in order to impart durability at the time of marketing, and is relatively expensive. Moreover, silicone-coated paper products have a rough surface due to the fibrous and porous nature of the paper. The rough surface shape of the paper is transferred to a label attached to the paper, and adversely affects the smoothness of the label. This adverse effect is particularly problematic when the release backing paper is used for a transparent label having an adhesive layer that tends to pick up the surface shape of the backing paper. When the rough surface shape of the backing paper is transferred to the adhesive layer of the transparent label,
The transparency of the adhesive layer and thus the label is reduced. Accordingly, there is a need for an extremely smooth backing paper material that does not transfer the rough surface profile to the adhesive layer of the transparent label.

Another problem with the use of silicone coated backing and liner materials is that they tend to tear or tear during the die cutting operation. There is a need for a backing paper and liner material that can be neatly cut by a die cut press so that a finished shape with smooth edges is obtained.

[0005] Food release containers, trays, and support sheets, as well as drums, tubes, and containers for sticky industrial compounds, require a release coated surface. Complete delamination of food and industrial compounds from the surface of such containers minimizes product waste. By completely peeling off food from the container surface,
The appearance of the food can be kept as it is, and an aesthetically pleasing product appearance is provided. For example, it is desirable to provide a release coating on the box or tray insert so that the melted cheese flowing from the pizza slice does not stick to the pizza box or pizza tray. When cheese melts from a pizza slice flows over the surface of an existing cardboard pizza box, the cheese sticks to the box and lifts the pizza slice out of the box, causing the cheese to peel off the toppings from the pizza slice. I will. Therefore, there is a need for a food container, support sheet, and tray that can prevent food from sticking to its surface by providing a release coating.

Similarly, there is a need for industrial compositions or containers for industrial compounds, such as drums and tubes, having release material coatings that can prevent sticky compounds from sticking to the container.

Known coated paper liners for food containers and industrial compound containers are desirable because of their good printability and rigidity. However, coated paper liners also have undesirable properties, such as water removal and curl, because they require sufficient thickness to provide satisfactory tear resistance. Since the water removal property is to absorb the water content from the food or industrial compound that comes into contact with the liner, it adversely affects the quality of the stored food or industrial compound and the structural stability of the container.

Some polymer compositions have good moisture resistance and tear resistance, but have poor printability and rigidity.
Polymer liners may also lack dimensional stability in many applications. U.S. Pat. No. 5,244,702 discloses a paper-plastic laminate sheeting that can be used to make food bags and packaging. However, it does not suggest that the resulting laminate can be used as a release backing paper. The plastic layer may include a polypropylene, polyethylene, nylon, or polyester film. The above patent teaches to use a water-based adhesive instead of a hot-melt adhesive when laminating the film to the paper layer in order to avoid a decrease in the strength properties of the film. Thus, the above patent teaches that the film surface is first ionized to increase the surface energy of the film surface so that the inner surface of the film better accepts the aqueous adhesive.

It has been found that the ionization treatment has a deleterious adverse effect on and destroys the silicone coating on the polymer thin film unless extremely low power is used. Even when only the opposite surface of the film without the silicone coating is ionized, the silicone coating on the polymer thin film may be broken.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a silicone film having excellent moisture resistance, excellent peelability, printability, rigidity, tear resistance, and dimensional stability.
It is to provide multilayer products such as backing materials and liner materials.

Another object of the present invention is to solve the problem of curling and swelling due to the absorption of water into the paper layer without harmful adverse effects on the silicone release surface due to the thin layer structure. It is an object of the present invention to provide a method for producing the above-mentioned backing material and liner material at a high production rate.

[0012]

SUMMARY OF THE INVENTION The gist of the present invention is to form a polymer layer having a first surface provided with a substantially uniform silicone coating and an opposite second surface; Forming a cellulose layer adjacent to the molecular layer; supplying an adhesive between the second surface and the cellulose layer;
Contacting the second surface with the cellulose layer and bonding the second surface and the cellulose layer with the adhesive to form a multilayer product. According to the production method of the present invention, a high production rate in a continuous in-line method is enabled, and the paper layer is further curled or swollen without substantially destroying the silicone coating of the multilayer structure of the present invention. In addition, the silicone-coated polymer layer can be continuously bonded to the paper layer.

In a preferred embodiment of the above manufacturing method, a hot melt adhesive is continuously applied to the polymer material to form an adhesive layer, and then the polymer layer is placed in a nip of a roller rotating in the opposite direction. To be laminated. Preferably, at least one of the rollers is a cooling roller to solidify the adhesive and to avoid paper and silicone coating from substantial distortion or breakage. In a preferred embodiment of the above manufacturing method, furthermore, treating the polymeric material with a low level corona discharge facilitates bonding of the adhesive to the polymer without substantially adversely affecting the release properties of the silicone coating. To

Another aspect of the present invention is a backing material and a liner material comprising a polymer layer, an adhesive layer, and a cellulosic material layer having a substantially uniform silicone coating formed on one side thereof. The backing material and the liner material are characterized in that a material layer is disposed between the polymer layer and the cellulosic material layer and adheres the two layers.
The multilayer structure of the present invention has all of the advantages of a coated paper backing material and a polymeric liner, even in structures that are less than about 60% of the thickness of the silicone-coated backing paper, thus providing excellent release, It has excellent moisture-proofing properties along with printability, rigidity, tear resistance and dimensional stability.

The structure of the backing and liner materials of the present invention can be very thin, for example, less than about 60% of the thickness of a comparable silicone-coated paper release material, yet still exhibit excellent release properties and durability. Has the property. Further, by having a silicone-coated polymer surface having high smoothness, the problem of transfer of a rough surface shape to a label adhesive can be solved. The backing and liner materials may be substantially thinner, for example, less than about 60% of the thickness of a comparable silicone-coated paper release material, and the strength may be It has at least a silicone-coated paper material. In addition, the material of the present invention has a smooth surface suitable for die cutting, and enables precise molding cutting while minimizing the risk of material tearing or tearing.

In a preferred embodiment of the above-mentioned backing material and liner material, as the polymer material for the polymer layer, a stretched polyester material, in particular, a stretched polyethylene terephthalate is used. The surface of the polymer layer with the silicone coating is extremely smooth and has a very low surface energy release surface. The structure of the present invention is ideal for transparent adhesive label backing papers by having a highly smooth surface. This is because when the label is separated from the backing paper, this smooth surface minimizes distortion of the pressure sensitive adhesive layer on the label. Since the microscopic structure of the backing material is extremely smooth, there is no transfer of the surface shape from the backing material to the adhesive layer of the label. The low distortion of the pressure sensitive adhesive layer allows the adhesive layer of the label to have excellent transparency, which is a particularly advantageous feature for transparent labels.

In a further preferred embodiment of the backing material and liner material described above, a stretched polyethylene terephthalate polymer having an outer surface coated with a polymerized silicone composition and adhered to the paper layer by a polyolefin-based hot melt adhesive Provide a multilayer structure comprising layers. Some of the preferred structures according to the invention are laminated to a paper layer of tissue paper or kraft paper, up to about 12 points in thickness, depending on the desired product application, with a thickness range of about 0 to about 12 points. .25 to about 1.5 mil. Thicker polymeric cellulose layers are also within the scope of the present invention.

In a further preferred embodiment of the backing material and liner material described above, an adhesive label using a peelable backing paper is provided, and more particularly, a transparent pressure sensitive adhesive label. Further, there are provided containers, trays, and supports having a release liner that is in contact with a tacky industrial composition such as a food or resin.

[0019]

DETAILED DESCRIPTION OF THE INVENTION In accordance with the present invention, there is provided a multilayer sheet and web material comprising a silicone-coated polymer layer adhesively laminated to a cellulose layer. Also, according to the present invention, there is provided a method for producing such a material at high speed using a conventional laminating apparatus. The material of the present invention can be used as a release backing for adhesive labels, or as a liner for containers, trays and support surfaces for food and industrial compositions or compounds. In particular, the material of the present invention is suitable as a release backing paper for transparent pressure-sensitive adhesive labels, and as a liner for containers or surfaces that come into contact with food or industrial compositions or compounds having adhesiveness or adhesiveness. According to an embodiment of the present invention, by laminating the thin paper to the silicone-coated polymer layer, the thickness of the silicone-coated paper product can be reduced by at least about 40% without loss of strength. For example, 2.5mi
Instead of a l-thick silicone backing paper, the laminated structure of the present invention having a thickness of 1.5 mil or less can be used.

The release liner for pressure-sensitive adhesive labels provided by the laminated structure of the present invention has sufficient smoothness on the silicone-coated surface of the polymer layer, so that when the label is separated from the silicone coating, the adhesive on the label side is removed. Surface distortion can be minimized. Having such a smooth surface is particularly important when the label is substantially transparent. If the silicone-coated surface of the polymer layer is not smooth, the surface of the adhesive layer of the label tends to be distorted or deformed when the label is peeled from the release backing paper, which adversely affects the sharpness of the adhesive label. Distortion or deformation of the label adhesive layer presents particular disadvantages when the label is substantially or completely transparent. Further, the adhesive layer of the label tends to pick up the surface contour or shape of the backing paper, and if the silicone coated release surface of the backing paper is not sufficiently smooth, it will adversely affect the sharpness of the transparent label and the smoothness of the label. Effect.

The multilayer sheet material of the present invention comprises (a) a polymer layer having a first surface and an opposite second surface,
(B) forming a substantially uniform and smooth silicone coating on the first surface of the polymer layer; (c) providing a cellulose layer adjacent to the polymer layer; It can be produced by providing an adhesive layer between the cellulose layers and (e) adhering the second surface and the cellulose layer via the adhesive layer. According to an embodiment of the present invention,
The silicone coating formation step and the subsequent silicone coating polymer / paper lamination step can be performed without winding the polymer layer.
All can be performed by the in-line method. Also, according to another embodiment of the present invention, a preformed silicone-coated film can be used. The previously formed silicone-coated film is supplied in the form of a take-up roll, pulled out from the roll, and provided for lamination on a cellulose layer.

The polymer layer of the present invention can be formed from various polyester resins. Homopolymers usable for the polyester resin include polyethylene terephthalate, polytetramethylene terephthalate, polyethylene-2,6-naphthalate and polyethylene-
1,4-cyclohexylene dimethylene terephthalate is exemplified. Similarly, copolyesters can be used. Examples of such a copolymerized polyester include polyethylene terephthalate / isophthalate, polyethylene terephthalate / adipate, polyethylene terephthalate / sebacate, and polyethylene terephthalate / sulfoisophthalate. Among them, polyethylene terephthalate homopolymer is preferred.

The polyester film has smoothness, strength,
Since it is excellent in tear resistance and moisture resistance, it can be preferably used as the polymer layer of the present invention. According to a preferred embodiment of the present invention, polyethylene terephthalate (PE)
T), in particular, a uniaxially or biaxially stretched oriented PET film can be suitably used as the polymer layer.

When polyester is used as the polymer layer, another polymer may be contained in the polyester film. In this case, the polyester content is about 85%.
% Is preferable. For example, a blend of a polyester and a polyolefin such as polyethylene terephthalate / polyethylene or a blend of a polyester and a polyamide such as polyethylene terephthalate / nylon may be used.

Since the silicone coating of the polymer layer has a low surface energy, the laminate of the present invention can be suitably used as a release backing paper or a release liner. Although there are many methods for forming a silicone coating having a low surface energy on a polymer layer, a preferred method for producing a silicone-coated polyester is described in US Patent Application No. 07 / 773,323 (October 11, 1991). 08 / 476,001 (filed on June 7, 1995) and 08 / 601,587 (February 1, 1996).
4th) and European Patent 536,766 (registered September 11, 1996) (all assigned the same assignee as 'Gover L. Farrar'); Name: Inline silicone-coated polyester film and method of coating the film; These contents are hereby incorporated by reference).

A method for producing a silicone-coated polyester film, which is a preferred polymer film used for the polymer layer, will be described below. However, the following method is also applicable to a method for producing a coated polymer layer made of a different polymer.

The polyester film of the present invention can be produced by an extrusion method. First, the polyester resin is heated and melted, and then extruded into an amorphous sheet through a wide slot die. The extrudate is extruded onto a rotating cooling drum having a polished surface and quenched to form a polyester sheet. The obtained polyester sheet is subjected to about 80 ° C to about 160 ° C, preferably about 90 ° C to about 100 ° C.
The film is stretched in one or more axes while being heated to a temperature of. The stretching ratio is in the range of about 3 to 5 times the dimension of the polyester sheet. As the stretching of the polyester sheet, biaxial stretching (stretching in the longitudinal direction and the transverse direction) is preferable to uniaxial stretching.

Before the surface of the polyester film is coated with silicone, the film may be subjected to a conventional surface treatment by corona discharge. The corona discharge treatment is a conventionally known surface treatment performed on the polyester film, and can improve the wettability of the film. The corona discharge treatment method and apparatus therefor are disclosed, for example, in U.S. Pat.
239,973. In an embodiment of the present invention, the power level of the corona discharge performed prior to the silicone coating of the polyester film is about 5 watts / ft ² /
Minutes or less, for example, in the range of about 1.5-4 watts / ft < ² > / min.

In the case of a uniaxially stretched film, the corona discharge treatment and the subsequent silicone coating treatment can be performed by an in-line method at any stage before or after the stretch orientation of the film. When the corona discharge treatment and the subsequent silicone coating treatment are performed before the stretch orientation, the film is subjected to a heat treatment before the stretch orientation to remove moisture in the silicone coating. In the above-mentioned in-line method, when the film is subjected to the corona discharge treatment and the subsequent silicone coating treatment after the film is uniaxially stretched in the longitudinal direction, it is necessary to completely dry the film before winding. As a method of drying the film before this winding,
In general, a heat setting process performed to maintain and maintain the physical properties of the film is used. In the case of a uniaxially stretched film, it is preferable to carry out a corona discharge treatment, a film coating treatment, and then a stretching orientation treatment in this order.

In the case of a biaxially stretched film, a corona discharge treatment followed by a silicone coating may be performed before the stretching step in the in-line process, that is, during the period between the longitudinal stretching and the transverse stretching or at any stage after the biaxial stretching. Processing may be performed. When the corona discharge treatment and the subsequent silicone coating treatment are performed after the stretching orientation treatment, it is preferable to completely dry the film before winding. Similarly, the biaxially stretched film needs to be heat-set for fixing the physical properties of the film, and this heat-setting allows the film to be sufficiently dried before winding. When the corona discharge treatment and the subsequent silicone coating treatment are performed before the biaxial stretching orientation treatment or during a period between each stretching, it is sufficient to remove moisture in the silicone coating during the latter stretching treatment. In the case of a biaxially stretched film, the corona discharge treatment and the subsequent silicone coating treatment are preferably performed during the period between each stretching treatment.

Next, the polymer layer, preferably the corona-treated surface of the polyester sheet, is coated with silicone. The coating composition used for the silicone coating is applied in the form of an aqueous emulsion according to known application techniques. For example, as a method for applying the film, a method such as roll application, spray application, gravure application, reverse gravure application, or slot application may be used. By heating the film by preheating, stretching and heat setting processing,
It can remove moisture by evaporation, cure the coating, and adhere the coating to the polyester film.

The stretched film is usually from about 190 ° C. to about 240 ° C., preferably about 2 ° C., regardless of uniaxial or biaxial stretching.
Heat set at a temperature of 15 ° C to about 235 ° C. The coated stretched polyester film is then wound into rolls for further processing or shipping.

[0033] Silicone coatings are usually formed by hydrolyzing glycidoxysilane in deionized water and mixing with an aqueous silicone resin emulsion and the corresponding crosslinker. In the reaction of the aqueous silicone resin composition, a platinum catalyst is usually used. However, when a condensation type siloxane is used, a tin catalyst is used for the reaction of the emulsion. As a cross-linking agent to be used, a cross-linking agent recommended by a specific manufacturer with respect to a specific aqueous silicone resin composition is used.

The following are examples of the aqueous silicone resin composition which can be used in the present invention.

(1) An aqueous silicone resin composition Syl-off "X2" comprising a crosslinking agent "X2-7721" or "X2-7922" comprising methylvinylpolysiloxane, methylhydrogenpolysiloxane and platinum polysiloxane.
-7720 "," X2-7900 "or" X2-791 "
0 "(manufactured by Dow Corning; Midland,
Michigan).

(2) Aqueous silicone resin composition "SM3200" comprising a crosslinking agent "3010" comprising methylvinylpolysiloxane, methylhydrogenpolysiloxane and platinum polysiloxane (GE Silicones; S
chenectady, NY).

(3) Crosslinking agent "V2 comprising methylvinylpolysiloxane, platinum and methylhydrogenpolysiloxane
0 ", an aqueous silicone resin composition" 410E "
(Wacker Silicone; Adria
n, Michigan).

(4) Aqueous silicone resin composition "PC-105" (Rhone-Poulenc) comprising catalyst component "PC-95" comprising methylvinylpolysiloxane, methylhydrogenpolysiloxane and platinum polysiloxane.
Rock Hill, S.C. C. ).

(5) An aqueous silicone resin composition "PC-107" (Rhone-Poulenc) having a similar composition to that of "PC-105", using "PC-95" as a crosslinking agent.
Rock Hill, S.C. C. ).

(6) An aqueous silicone resin composition “PC-188” (Rhone-Poulenc) having a similar composition to “PC-105” using “PC-95”: as a crosslinking agent
Rock Hill, S.C. C. ).

The amount of deionized water to be added to the aqueous silicone resin composition can be changed according to the coating method and the weight of the solid content applied to the polyester film.

The glycidoxy silane is represented by the general formula X-
Y-Si- (R1, R2 or R3) (wherein, X represents a glycidoxy group, Y represents an alkylene group such as methylene, ethylene, propylene, and R1, R2 and R3 represent a methoxy group, an ethoxy group, Glycidoxypropylmethoxysilane or general glycidoxysilane represented by a hydrolyzable group such as an acetoxy group). These silanes have water solubility or water dispersibility.

The solids content in the silicone coating ranges from about 3% to about 30% by weight, preferably from about 5% to about 15% by weight. The solid content in the silicone coating is 3
If it is less than% by weight, only a minimal effect is obtained. Although the effect is obtained even if the solid content in the silicone coating exceeds 30% by weight, the fogging of the film increases the cost of forming the coating, but does not provide the effect corresponding to the above preferred range. .

As described above, the silicone coating layer of the present invention comprises an aqueous thermosetting silicone resin composition, necessary components such as a crosslinking agent, and glycidoxysilane. In the present invention, the lower limit of the amount of glycidoxysilane used in the aqueous silicone resin composition is about 1.0% by weight based on the silicone solid content. In the preferred solids content range of about 5% to about 15% by weight in the silicone coating, the concentration of glycidoxysilane in the solution is about 0.5% to about 1.5% by weight. Range. Preferably, on a dry weight basis, the glycidoxysilane is used in a range from about 3% to about 30% by weight, based on the silicone solids. Even if glycidoxysilane is used in an amount of more than 30% by weight on a dry weight basis, an effect proportional to an increase in the use amount cannot be obtained only by increasing the cost.

The silicone coverage is preferably in the range of about 0.02 to about 0.10 pounds / ream. Preferably, the thickness of the silicone coating ranges from about 750 angstroms to about 1,500 angstroms. Generally, if the thickness of the coating is less than 750 angstroms,
No release coating effect, while coating thickness is 1,500
If it exceeds Å, it is disadvantageous in terms of cost.

The thickness of the polymer layer can be varied depending on the use of the final multilayer product. When used as a release backing for adhesive labels, the thickness of the polymer layer, including the silicone coating, is preferably from about 0.25 mil to about 1.5 mil, and in certain applications from about 0.5 mil to about 1. A range of 0 mil is more preferred. In addition, when used as a liner for contact surfaces with containers and food or industrial compounds, the thickness of the polymer layer is the thickness of the cellulose layer, the flexibility of the product, the food or industrial compound in contact with the liner. It is determined depending on various factors such as weight and shape, and preferably has a slightly larger thickness than for adhesive labels. For example, the thickness of the polymer layer in a 55 gallon drum liner for a particle-containing industrial resin is generally greater than the thickness of the polymer layer in a 1 pint box liner for a lightweight syrup.

The surface of the polymer layer opposite to the silicone-coated surface (hereinafter also referred to as the bottom surface) is adhered to the cellulose layer via a laminating adhesive. When using certain adhesives,
In order to increase the adhesiveness, that is, the adhesion of the polymer layer to the cellulose layer, a surface treatment can be performed on the laminated surface of the polymer layer. As the surface treatment of such a polymer layer laminated surface,
Chemical treatment, flame treatment, corona discharge treatment, and combinations thereof can be mentioned. However, these surface treatments must not adversely affect the silicone coating provided on the opposite side of the polymer layer lamination surface.

For example, the wettability of the aqueous adhesive applied to the polymer layer laminated surface can be improved by corona treatment. It is preferable to perform the corona discharge treatment on the laminated surface at a sufficiently low power and speed so as not to adversely affect the releasability of the silicone coating provided on the surface opposite to the polymer layer laminated surface. The low-power corona discharge treatment is performed, for example, in a manner similar to the method described in FIG.
Less than 5 watts / ft ² / min, preferably less than about 0.2 watts / ft ² / min, more preferably 0.1 watts / ft ²
Perform at power and speed less than or equal to / min. 0.1 watt / ft
Even when the treatment is performed at a low power such as ² / min, improvement of wettability and adhesion of the treated surface, which are particularly important characteristics when using an aqueous adhesive, can be achieved.

Even when the high-power surface treatment is performed only on the surface opposite to the silicone-coated surface, the smoothness and the peelability of the silicone-coated surface may be adversely affected. It is better to avoid processing. According to our findings, a 142 gauge thick silicone coated P
Even when the laminating surface of the ET film is corona treated at a low power of 0.5 watts / ft ² / min, the opposite silicone coating is substantially destroyed. When the thickness of the polymer layer is increased, the protective force against the silicone coating is increased, so that a high-power corona discharge treatment can be performed.
When the polymer layer is subjected to corona discharge treatment, it is preferable to perform the treatment at a power and at a rate that improves the wettability of the film laminated surface and does not substantially adversely affect the silicone coating on the opposite side.

When a hot melt adhesive is used, the wettability and adhesiveness of the adhesive to the polymer layer are generally excellent without corona treatment, and corona treatment on the film surface is unnecessary.

When the polymer layer is a web or film made of a polymer material already having a silicone coating, and it is necessary to perform a corona treatment on the laminating surface, the web or film is drawn from a roll and then laminated. Is preferably subjected to a corona treatment. If the corona surface treatment is performed before winding, the lamination surface to be treated adheres to the silicone coating wound thereon during winding, and the silicone coating migrates to the lamination surface, which is not preferable.

The cellulose layer is preferably made of a paper material. In an embodiment of the present invention, the cellulose layer includes a tissue paper layer, a kraft paper layer,
Paperboard layers of cardboard, fiberboard drum sidewall material layers and rayon material layers up to and beyond 12 points. Further, cellulosic materials include sheet pulp or fibrous materials such as cardboard, corrugated paper, or cotton-containing paper. As used herein, "cellulosic material" includes materials having a cotton-containing sheet-like structure, and "sheet" and "sheet-like" refer to rectangular pieces of cellulose material and winding of said material. Includes both paper (web). It is preferable that the surface of the cellulose layer be left untreated or subjected to a treatment for increasing the adhesion to the laminating adhesive.

The laminating adhesive preferably comprises at least one adhesive selected from hot melt adhesives such as extruded polyolefins, solution adhesives, emulsion adhesives and wet laminating adhesives. As the adhesive composition, one that is mainly compatible with the polymer film is selected in consideration of the fact that the paper layer can be generally adhered by various types of adhesive compositions. In a preferred method and configuration of the present invention, an extruded hot melt polyolefin, more preferably extruded low density polyethylene (LDPE), is used as the laminating adhesive. Further, in a preferred embodiment of the present invention, low density polyethylene is melt extruded at a temperature of about 585-610 ° F. to laminate a silicone coated PET layer on kraft paper.

The laminating adhesive is used in an amount sufficient to bind the polymer layer and the cellulose layer without significantly increasing the overall thickness. When a laminating adhesive made of low-density polyethylene is used, its coating amount is 3,000 ft.
A range of about 7 to 14 pounds per ² is preferred. It is preferable to extrude a hot melt adhesive between the polymer layer and the cellulose layer in the vicinity of the pressure nip area where the polymer layer and the cellulose layer are laminated. When using a wet laminating adhesive, especially a water-based adhesive, it is preferred to apply it at a position very close to the pressure nip area or first on the polymer layer. Otherwise, the liquid content or moisture of the adhesive is absorbed by the cellulose layer, which is not preferable. Generally, the adhesive is applied to form a continuous layer to prevent adverse effects on the label surface. However, in another embodiment of the present invention, the adhesive may be applied in an intermittent or spot form between the polymer layer and the cellulose layer. For example, in the case of a tray or pizza container, it is not necessary to apply an adhesive to form a continuous layer.

The adhesive can be applied on the film before it reaches the pressure nip area. However, when a hot melt adhesive is used, it is better to apply the adhesive at a position not too far from the press-contact nip in order to prevent the adhesive from being cooled and hardened early before lamination. The water-based adhesive and the solution-type adhesive are preferably applied to the polymer layer instead of the paper layer to suppress the absorption of moisture or solvent into the paper layer, thereby suppressing curling and swelling of the laminated product. When using water-based and solution-based adhesives, if the adhesive is able to retain adequate wettability on the film and if the wettability of the adhesive-coated film does not affect the pressure nip, The adhesive can be applied at a position remote from the pressure nip area.

Preferably, the adhesive is applied just before the film reaches the pressure nip area. In a preferred embodiment, an adhesive is applied to the film as the film passes through a pressure roller forming a pressure nip. For hot melt adhesives, such as polyethylene hot melt,
Preferably applied as a continuous layer, but spray application,
It may be applied as a continuous or discontinuous layer by brushing or roll coating. Using an offset gravure printing system, a dot pattern of adhesive can be formed on the film. Alternatively, under other conditions, the adhesive may be applied to the paper layer before reaching the pressure nip area.

The drying conditions of the laminating adhesive are selected so as to suppress curling of the final product. The drying temperature is, for example, about 225 to about 3 for an aqueous adhesive.
The range is 00 ° F. When using an aqueous adhesive or a solution-type adhesive, the adhesive is preferably applied immediately before the laminating step and dried immediately after the laminating step. If a hot melt adhesive is used for lamination, the adhesive is preferably cooled immediately after lamination to prevent or prevent thermal deformation of the polymer layer and silicone coating due to the high temperature of the hot melt adhesive.

According to a preferred embodiment of the present invention, one of the two laminating rollers is cooled to prevent excessive softening of the plastic film or breakage or deformation of the silicone coating. The use of a chill roller is particularly useful when the hot melt adhesive is applied to the softening or glass transition temperature (T
It is preferred when the coating is performed at a temperature near or above g). The melting point of the hot melt adhesive is preferably lower than the glass transition temperature of the polymer layer in order to avoid deformation and softening of the polymer layer. The temperature of the chill roller ranges, for example, from about 50 to about 85 ° F.

Preferred adhesives for use in polyethylene terephthalate films include melt compositions consisting essentially of low density polyethylene. Further, a pigment and other additives can be added to the adhesive composition as needed. However, hot melt adhesives can achieve high strength bonding without using water or solvents. In the case of hot melt adhesives, since no water or solvent is used, little or no adhesive or adhesive carrier is absorbed by the paper layer and there is no problem of swelling or curling of the resulting product. The molten adhesive is applied to the film and / or paper layer when the film and / or paper layer reaches or immediately before reaching the pressure nip area between the laminating rollers.
And / or extruded in the width direction on a paper layer.

In the actual lamination process, lamination is performed using a motor drive and operating the laminator at a speed of about 150 to about 500 feet per minute or higher. The operating speed is determined according to the strength of the web used.
For lower strength, relatively thin papers, use operating speeds in a range that does not damage the web. The oriented film can be laminated at a high speed, but the operating speed is determined so as not to exceed the running speed of the web.

The products of the present invention produced by the above methods include release backing papers and liners on containers or surfaces that come into contact with sticky or adherent food and industrial compositions or compounds. According to the present invention, there is also provided a surface material including a label, a container, and a release backing paper or liner. According to a preferred embodiment of the present invention, there is provided a combination of a label and a release backing. In this combination, the label has, on one side, an adhesive-coated surface in contact with the release backing paper. The adhesive-coated surface of the label is formed from a conventional pressure-sensitive adhesive. The release backing consists of a substantially uniform and smooth polymeric layer having a first surface with a silicone coating. The release backing paper further includes an adhesive layer and a cellulose layer. The adhesive layer is provided between the polymer layer and the cellulose layer, and bonds the two layers. The smooth silicone coating of the polymer layer is in contact with the adhesive-coated surface of the label.

In accordance with another embodiment of the present invention, there is provided a combination of a substantially transparent label and a release backing. According to a more preferred embodiment of the present invention, there is provided a combination of the above label and release backing paper using a silicone coated stretched PET film layer as the polymer layer and / or a thin kraft paper as the cellulose layer.

According to yet another embodiment of the present invention, there is provided a combination of a container or facing and a release liner. Such containers or surface materials are particularly suitably used for those whose release liner is in contact with an industrial composition or compound such as food or resin having tackiness or adhesion. As the release liner used in the above combination, a release liner having the same configuration as that used in the label release backing paper of the present invention can be used, but the thickness of one or more layers can be increased. Also, the release surface of such a liner,
It need not be as smooth as the release surface of the release paper for transparent labels. However, it is preferred that it have sufficient smoothness to substantially prevent food or industrial compound adhesion. By using such a release liner, the breakage of foods or industrial compounds in contact therewith can be suppressed, and it can be particularly suitably used as a fiber drum liner and a pizza container or a pizza container liner or tray insert.

According to yet another embodiment of the present invention, the cellulose layer comprises a fiber drum sidewall material used in the manufacture of a fiber drum. The release liner of the present invention can be used by inserting it into a fiber board, but by molding the laminate of the present invention,
For example, the laminate can be wound into a drum shape to form the drum itself. The resulting fiber drum has on its surface a release liner consisting of a silicone-coated polymer layer previously laminated to a fiberboard material. In this embodiment, the thickness of the cellulose layer is increased. The thickness of the cellulose layer is in the range of about 10 to about 1,000 mils and, given the field of application of the fiber drum,
Preferably it ranges from about 100 to about 500 mils.

FIG. 1 is a side view illustrating an apparatus and method for manufacturing a laminate of the present invention, according to a preferred embodiment of the present invention. According to the illustrated embodiment, a polymer layer (10) in the form of a film, sheet or web (web) is laminated to a cellulose layer (12) supplied in the form of a sheet or web. . In experimental scale operation, each web has a width of about 30 inches and is conveyed at a rate of about 60 feet per minute. In an actual production line, each web has a standard width of about 80 to about 120 inches and is conveyed at a line speed of about 1,000 to about 2,000 feet per minute. For clarity, the thicknesses of the polymer layer (10) and the cellulose layer (12) are exaggerated in the figures.

The polymer layer (10) is supplied from a paper feeding section (not shown) such as a roll, or preferably a layer obtained by coating a newly drawn polymer film with a silicone coating by an inline method. The polymer layer (10)
Silicone coated release surface comprising silicone coating (14)
Having. Silicone coatings are made by hydrolyzing glycidoxysilane in deionized water and then compounding it with an aqueous silicone resin emulsion and the corresponding crosslinker. The surface of the polymer layer (10) opposite the silicone-coated release surface (14) has a lamination surface (16) that is treated by a corona discharge unit (18) before lamination.
Many commonly used laminating machines include a corona processing unit (20) for processing the film surface opposite the laminating surface (16). This corona treatment unit (20) is not used to prevent breakage of the silicone coating. When an aqueous laminating adhesive is used, the corona discharge treatment can improve the wettability of the adhesive to the laminating surface (16) as long as the silicone coating on the opposite side of the laminating surface (16) is not destroyed.

The polymer layer (10) and the cellulose layer (1
2) is supplied to a pressure nip (22) formed by two pressure rollers (24) and (26). The pressing roller (26) has a cooling unit, and has a function as a cooling roller together with a function as a pressing roller.
When the polymer layer (10) passes through the pressing roller (24), before the polymer layer (10) reaches the pressing nip (22), the polymer is applied from the adhesive application die (30) to the surface of the polymer layer (10). Apply hot melt adhesive (28). An air gap (32) is provided between the nozzle tip (33) of the adhesive application die and the surface of the polymer layer to which the adhesive is first applied.

The polymer layer (10) and the cellulose layer (1
2) is a pressing nip (2) with an adhesive between these layers.
2), and are bonded and laminated to form a laminate (34). At the lamination position and / or immediately after lamination,
The laminate (34) cools the hot melt adhesive (28) by passing through a pressure roller (26) having a function as a cooling roller, thereby suppressing thermal deformation of the polymer layer (10) coated with silicone. Or prevent. Immediately after passing through the pressure nip (22), the position of the pressure roller (26) having a function as a cooling roller is near the pressure nip (22) and at a position separated from the pressure nip (22).
For example, one or more cooling rolls including a pressing roller (26) having a function as a cooling roller are arranged at the position. However, if the distance until the laminate (34) passes through the cooling roll is too long, thermal deformation of the polymer layer (10) may occur before the adhesive cools. Also, preferably, the chill roll is maintained at ambient temperature or about 72 ° F. The pressing roller (26) rotates clockwise as indicated by the arrow (36) in the figure. on the other hand,
The pressing roller (24) rotates counterclockwise.

When the melting point of the hot melt adhesive used is lower than the glass transition temperature (Tg) of the polymer film, it is not necessary to immediately cool the laminate (34). A take-up roller (not shown) is provided to take in the laminate (34). The rotation speed of the winding roller determines the lamination speed and the supply speed of each layer.

The adhesive application die (30) is controlled to feed at the desired adhesive application weight and lamination speed. By controlling the adhesive application die (30), an appropriate amount of adhesive required for lamination and bonding can be applied.

[0071]

The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. In the examples, “parts”, “%” and “ratio” are all based on weight. Unless otherwise specified, all temperatures refer to “ΔF”.

Examples 1-2, Reference Examples 1-4 and Comparative Example 1 In each example, various non-laminated standard samples, laminated products of the present invention,
The label or tape was peeled from the silicone-coated surface of the comparative laminate, and the force required for the peeling was determined. The test conditions of each sample were changed, and the effect of the test conditions on the peelability was analyzed.

Reference Examples 1-4, Examples 1-2, and Comparative Example 1
, A pilot line having a width of 30 inches was used. At that time, each silicone-coated PET film was pulled out of a roll and tested under predetermined conditions. The test was carried out by changing the line speed, the shortest passage length, the corona treatment, the preheating, the weight of the laminated paper, and the fixing of the idler roller.

In each of the reference examples, examples and comparative examples,
As the silicone-coated PET film, a roll film manufactured in advance was used. This roll film was manufactured as follows. First, the PET film is uniaxially stretched 3.7 times in the longitudinal direction, and coated with the glycidoxysilane silicone coating composition, and then, the PET film is stretched 3.7 times in the transverse direction.
The film was stretched 7 times. The PET films used in Reference Examples 1-4, Examples 1 and 2, and Comparative Example 1, respectively, had a silicone coating with a thickness of about 750 to about 1500 angstroms.

Using the apparatus and method shown in FIG. 1, the silicone-coated PE used in Examples 1 and 2 and Comparative Example 1 was used.
T film was inline laminated to bleached kraft paper. At the time of lamination, a hot melt resin adhesive “NOVAPOLLC-0717-A” made of low density polyethylene (N
Ovacor Chemicals Novapol L
D Division (Calgary, Alberta, Cana)
ex) was extruded onto a film. Hot melt resin adhesive "NOVAPOL LC-0717-A"
Has a melt index of about 7.5 and a density of about 0.917
g / cc.

As shown in Tables 1 and 2, in Example 2, 40 pounds of natural kraft paper per series was used as the cellulose layer and the PET film was fed from the secondary unwind position. The kraft paper was supplied from a main unwinding position from a roll. At this time, the minimum passage length of the kraft paper was about 15 feet, which was shorter than the minimum passage length of the PET film. In Example 1 and Comparative Example 1, the roll paper was arranged at the secondary unwinding position, while the PET film roll was arranged at the main unwinding position.

In Reference Examples 1 to 4, non-laminated silicone-coated PET films were treated under the conditions shown in Tables 1 and 2 below. In Reference Example 1, silicone-coated PE
T film was fed through the test equipment at a line speed of 500 feet per minute. After the line supply was completed, a film peel test was performed to obtain a reference value of the line peel force.

In Reference Example 2, while passing through the test device,
The side opposite to the silicone-coated side of the PET film is
Corona discharge treatment was performed at 0.5 watt / ft ² / min. In Comparative Example 1, the PET film was subjected to corona discharge treatment in the same manner as Reference Example 2, and then laminated on bleached kraft paper of 40 pounds per series. In Comparative Example 1, the laminated surface of the film was a corona-treated surface.

In Reference Example 3 shown in Tables 1 and 2, the film was heated at 275 ° F. in the primer heating zone at 20 minutes per minute.
Heating and softening were performed at a line speed of feet. Here, to heat the film sufficiently,
A low line speed of 0 feet was used.

In Reference Example 4, an idler roller in a forcibly fixed state arranged in the supply path of the sample film was used. By passing the sample film over the idler roller, the silicone-coated surface of the PET film was rubbed with the idler roller. The processing of Reference Example 4 corresponds to the conditions performed on an actual-scale production line. When the present invention is applied to such a production system, the silicone-coated surface of the film may pass over the stationary idler and affect the releasability of the coated surface.

The peeling force shown in Tables 1 and 2 was determined using an adhesive label or tape. For the pressure-sensitive adhesive label or tape, an acrylic adhesive was applied to the release surface of the silicone-coated PET film, and then a 2 inch wide x 12 inch long strip paper was applied as a label material for removing the adhesive. The force required to peel the strip of paper from the release surface was measured using a TLMI tester operating at a high pull rate of 400 inches per minute. Such a high-speed peeling condition is similar to a labeling condition in a mass production line. The results were expressed in force per 2 inch width. The peel force shown in Table 1 is the force required to peel the test label from the strip backing paper sample and was measured under room temperature (starting) and keel (140 ° C.) conditions.

In Table 1 below, when the peeling force per 2 inches exceeds 500 g (> 500), the peeling force of the test label is strong, and the measured value is outside the scale of the measuring instrument. Indicates that it is not possible.

[0083]

[Table 1]

Next, another sample of Reference Examples 1-4, Examples 1 and 2, and Comparative Example 1 was aged for one week under room temperature conditions and a sample after one week aging under keel conditions. Was subjected to a peel test. Table 2 shows the results of the peeling force test after aging for one week. Table 2
The term “weld” refers to a state in which the test label was attached to the sample release surface and the label was not separated from the release surface. Moreover, the peeling force per 2 inches is 50
If it exceeds 0 g (> 500), the peel strength of the test label is strong and the value is out of the range of the scale of the measuring instrument. Further, the peel force values shown in Table 2 were measured using a TLMI tester operating at a pulling speed of 400 inches per minute, as in Table 1.

[0085]

[Table 2]

For the 2 inch wide tapes used for peel force measurements in Tables 1 and 2,
Those having a peel force of less than 0 g are usable as a release backing paper. Peel force is 16 per 2 inch width
It is preferably less than 0 grams, more preferably less than 120 grams per 2 inches width, and even more preferably less than 100 grams per 2 inches width. These preferable values of the peeling force can be applied to both the initial sample and the sample aged at room temperature and under the keel condition for one week.

As can be seen from Tables 1 and 2, the laminates according to the invention according to Examples 1 and 2 show a proper and favorable release force. The above test results show that embodiments of the present invention provide excellent release backing papers and liners, especially release backing papers and liners for pressure sensitive adhesive labels.
These laminates exhibit not only excellent peeling force but also excellent printability, tear resistance, rigidity and moisture resistance. The main cause of the increase in the peeling force in Example 2 as compared with Example 1 is that the paper material of Example 1 used 20 pounds per series, whereas the rigidity of Example 2 used 40 pounds per series. This is probably due to the use of high-quality paper. Furthermore,
In Example 2, it is considered that the peeling force of the film collected at the secondary unwinding position was hardly or not affected at all.

In Reference Example 2 and Comparative Example 1, the surface opposite to the silicone-coated surface of the PET film was subjected to corona discharge treatment.
As can be seen from Tables 1 and 2, in Reference Example 2 and Comparative Example 1, the peeling force per 2 inch width exceeded 500 grams or the silicone coating was welded to the test tape, and the peelability was poor. Thus, the corona treatment adversely affects the peelability of the silicone-coated surface, making it extremely difficult to separate the laminated backing paper from the test label attached thereto,
Or it became inseparable. Even low power corona treatment at 0.5 watts / ft ² / min substantially adversely affected the silicone coating on the back side of the PET film, degrading the release properties of the release surface. As shown in Examples 1 and 2, when a hot melt adhesive was used, the adhesive was excellent in P.
Due to the infiltration into the ET film, it was not necessary to use a corona discharge treatment and the destruction of the silicone coating was eliminated.

As can be seen from the results of the peeling test of Reference Example 3 shown in Tables 1 and 2, preheating at 275 ° F. had little effect on improving the peelability. In addition, the preheating caused thermal deformation and wrinkling of the polymer film, deteriorating the smoothness of the film surface.

Further, as can be seen from the results of Reference Example 4 shown in Tables 1 and 2, it was found that the releasability of the silicone-coated surface was not substantially affected by rubbing on the fixed idler roller. . As can be seen from the excellent peel force,
There was little destruction of the silicone coating. The silicone coating acted as a lubricant, and the coated polymer film was able to glide smoothly over the stationary rollers without substantial scuffing or other breakage of the coating. Thus, these results show that the process of the present invention can be performed in the conventional paper industry with substantially no degradation of label release.

Examples 3-4, Reference Examples 5-8 and Comparative Example 2 In Examples 3-4, the force required to peel a 1-inch wide adhesive test tape conveyed at a low speed from the laminate of the present invention, and Tests were performed on the effect of various treatment conditions on the peelability of the test tape. Table 3 shows the production conditions and results. In Reference Examples 5 to 8, the same release backing papers as Reference Examples 1 to 4 were used. In Examples 3 and 4, the same release backing paper as in Examples 1 and 2 was used. In Comparative Example 2, the same release backing paper as in Comparative Example 1 was used. However, in Reference Examples 5 to 8, Examples 3 and 4, and Comparative Example 2,
Using a 1-inch wide TESA adhesive peel test tape, an Instron measuring instrument model TM series No. By 2335, the peeling force was determined (shown in Table 3). Also, the pulling speed was 12 inches / minute instead of 400 inches / minute. The reason for adopting such a low peeling speed is that
This is because it is similar to the case where the label is manually peeled off from the release backing paper. The Instron measurement was performed under initial keel conditions within about 20 minutes of the production of the release backing paper (device shutdown).

[0092]

[Table 3]

When a peel test is performed using a 1-inch wide TESA7475 test tape, the initial peel force is preferably less than 20 g / inch for the test sample at room temperature, and for the test sample under keel conditions. Preferably has a peel force of less than 50 g / inch. The peel force under keel conditions is more preferably 45 g
/ Inch.

From the results of Reference Example 6 and Comparative Example 2, even when the corona discharge treatment before lamination was performed at an extremely low power of 0.5 watt / ft ² / min, the corona treated surface of a 48-gauge PET film was used. It can be seen that the silicone coating provided on the opposite side of the above has an adverse effect. However, 1 inch width TES
The A7475 test tape still allows peeling. The test samples under the keel conditions shown in Table 3 showed very little thermal deformation, but only the reference example 7 which had been subjected to the preheating step had thermal deformation on the film surface.

In Reference Example 6, the test was performed after aging the test sample at ambient temperature for 24 hours. The average peel force after aging for 24 hours was 8 when the same standard sample was used.
It decreased from an initial value of 4.4 g / inch to 44.9 g / inch. The standard deviation of the average peeling force value after aging for 24 hours is
6.9.

From the above results of Examples 1 to 4, it is understood that favorable results can be obtained when the silicone-coated polymer layer is laminated on the cellulose layer by using the hot melt adhesive in combination with the cooling roll. By adopting such a combination, it is not necessary to perform corona discharge treatment for imparting uniform wettability to the laminating adhesive, and it is possible to form an integrated laminated structure having a release surface with low surface energy. I can do it. As described above, since the corona treatment on the polymer surface before lamination becomes unnecessary, breakage of the silicone coating provided on the opposite side of the lamination surface can be avoided.

As can be seen from the above table, the laminated structures of Examples 1 to 4 which are thin, inexpensive and manufactured in-line exhibit excellent peelability. It can be seen that the laminates of Examples 1 to 4 have this excellent releasability, and thus exhibit excellent effects in release liners, release backing papers, and other applications requiring non-adhesive low surface energy.

In the present invention, an aqueous adhesive can be used as an adhesive for lamination. Furthermore, PET
To improve the adhesive wettability of the film lamination surface, the corona treatment may be performed on the 48 gauge thick silicone coated PET film at a low power of about 0.2 watt / ft ² / min, by opposing the corona treated surface. The wettability of the aqueous adhesive can be improved without adversely affecting the silicone coating provided on the surface.

【The invention's effect】

According to the present invention, there are provided a multilayer sheet and a web material comprising a silicone-coated polymer layer adhesively laminated on a cellulose layer, and a method for producing the same. Further, the multilayer sheet and the web material of the present invention are a release backing for an adhesive label,
Alternatively, it can be used as a liner for containers, trays and support surfaces for food and industrial compositions or compounds.
In particular, the material of the present invention is suitable as a release backing paper for transparent pressure-sensitive adhesive labels, and as a liner for containers or surfaces that come into contact with food or industrial compositions or compounds having adhesiveness or adhesiveness.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an apparatus for performing a method of the present invention to form a laminated structure of the present invention, while illustrating a laminating method according to an embodiment of the present invention.

[Explanation of symbols]

 10: Polymer layer 12: Cellulose layer 14: Silicone coating release surface 16: Laminated surface 18: Corona discharge unit 20: Corona treatment unit 22: Pressing nip 24: Pressing roller 26: Pressing roller 28: Hot melt adhesive 30: Adhesion Adhesive application die 32: Air gap 33: Adhesive application die nozzle tip

Claims (23)

[Claims] 1. forming a polymer layer having a substantially uniform silicone coating on a first surface and an opposite second surface; forming a cellulose layer adjacent to the polymer layer; Supplying an adhesive between the second surface and the cellulose layer; adhering the second surface to the cellulose layer; and bonding the second surface to the cellulose layer with the adhesive to form a multilayer product. A method of manufacturing a multilayer sheet product. 2. The method according to claim 1, wherein the polymer layer comprises a polyester. 3. The method according to claim 1, wherein the polymer layer comprises stretched polyethylene terephthalate. 4. The method of claim 1, wherein the cellulosic layer comprises at least one selected from the group consisting of tissue paper, kraft paper, and paperboard. 5. The adhesive according to claim 1, wherein the adhesive is at least one selected from the group consisting of a hot melt adhesive, a solution adhesive, an emulsion adhesive and a wet laminating adhesive.
The method described in. 6. The method of claim 1, wherein the adhesive forms an adhesive layer of hot melt low density polyethylene, and the adhesive layer is formed by melt extruding low density polyethylene. 7. An adhesive comprising a hot-melt adhesive layer, wherein said adhesive layer is melt-extruded onto a polymer layer, and the obtained multilayer body passes at least a part of a cooling roll. 2. The method according to 1. 8. The method according to claim 1, wherein the silicone coating comprises from about 750 to about 1,5.
The method of claim 1 having a thickness of 00 °. 9. The polymer layer according to claim 1, wherein said polymer layer is about 0.25 mil to about 1.
The method of claim 1 having a thickness of 5 mils. 10. The adhesive is an aqueous adhesive, and the second surface of the polymer layer is subjected to a surface treatment before contact with the adhesive, so that the adhesion between the second surface and the adhesive is improved. The method of claim 1, wherein the method is performed. 11. The method of claim 10, wherein said surface treating step comprises treating the second surface with a corona discharge at a treatment power of about 0.2 watts / ft ² / min. 12. The method of claim 1, further comprising forming a label having a pressure sensitive adhesive on one side; and contacting the pressure sensitive adhesive with the silicone coating. 13. A polymeric layer having a first surface provided with a substantially uniform silicone coating and an opposite second surface;
An adhesive and a multilayer sheet product comprising a cellulose layer, wherein the adhesive is provided between the second surface of the polymer layer and the cellulose layer, and adheres the second surface and the cellulose layer to each other. Multi-layer sheet products. 14. The multilayer sheet product according to claim 13, wherein the polymer layer is made of polyester. 15. The multilayer sheet product according to claim 13, wherein the polymer layer is made of stretched polyethylene terephthalate. 16. The multilayer sheet product according to claim 13, wherein the cellulose layer comprises at least one selected from the group consisting of tissue paper, kraft paper, and paperboard. 17. The multilayer sheet product according to claim 13, wherein the adhesive is at least one selected from the group consisting of a hot melt adhesive, a solution adhesive, an emulsion adhesive, and a wet laminating adhesive. 18. The multilayer sheet product according to claim 13, wherein the adhesive comprises low density polyethylene. 19. The multilayer sheet product of claim 13, wherein the polymer layer has a thickness from about 0.25 mil to about 1.5 mils. 20. An adhesive, wherein the adhesive is a water-based adhesive, and the second surface of the polymer layer is subjected to a surface treatment prior to contact with the adhesive layer, whereby the adhesion between the polymer layer and the cellulose layer is improved. 14. The multi-layer sheet product of claim 13, wherein is enhanced. 21. The multi-layer sheet product according to claim 20, wherein the second surface of the polymer layer is subjected to a corona discharge treatment with a treatment output that does not substantially affect the peelability of the silicone coating. 22. A label having an adhesive provided on one side thereof, wherein the adhesive of the label comes into contact with the silicone coating of the polymer layer, and the silicone coating functions as a release surface of the adhesive. Item 14. The multilayer sheet product according to Item 13. 23. A silicone coating comprising from about 750 to about 1,
14. The multilayer sheet product according to claim 13, having a thickness of 500 °.