JP2000326439A - Pseudo-adhesive sheet laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pseudo-adhesive sheet laminate wherein a base material for a label is temporarily bonded to pasteboard in order to produce a label having any shape by punching processing in a printing machine. SOLUTION: In a pseudo-adhesive sheet laminate obtained by laminating a surface base material A, a pseudo-adhesive layer B and pasteboard C, the pseudo-adhesive layer B is a layer containing a self-adhesive as a main component and this pseudo-adhesive layer B appearing when the surface base material A or the pasteboard C is peeled hardly shows adhesiveness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quasi-adhesive sheet laminate in which a surface substrate is temporarily adhered to a backing paper by a quasi-adhesive layer. For example, the present invention relates to a quasi-adhesive sheet laminate in which a label base material is temporarily bonded to a mount in order to produce a label of any shape by punching with a printing machine or the like.

[0002]

2. Description of the Related Art As an example of using a pseudo adhesive sheet laminate,
There is a neck hanging label as disclosed in JP-A-9-99930. The neck hanging label is a label on which an advertisement of a product or the like is printed for the purpose of a sales campaign or the like, and the label is attached to the neck of a bottle of drinking water or liquor. Hereinafter, a method of manufacturing, processing, and using the neck label will be briefly described.

[0003] The label is obtained by temporarily bonding a label base material and a release base material to each other by thermal fusion of a thermoplastic resin. Usually, polyethylene is melted at about 300 ° C and the two base materials are laminated. Thus, a pseudo-adhesive sheet laminate can be obtained.

[0004] Next, desired printing is performed by a label printing machine, processed into a desired label shape by a punching machine, and at the same time, unnecessary portions of the surface substrate (hereinafter, cake) are removed (hereinafter, referred to as cake removal). Finished. In the case of the neck-hanging label, donut-shaped labels are arranged at equal intervals in the longitudinal direction on the release sheet because the label passes through the neck of the bottle.

[0005] The neck-hung labels obtained by the above-mentioned method may be peeled off by hand one by one and hung on a bottle.
Generally, an automated labeler is used. At this time, the magnitude of the strength of the pseudo-adhesion (hereinafter, peeling force) when peeling the label from the peeling sheet affects the workability. That is, if the peeling force is too heavy, the label may be fed out poorly, causing trouble. Conversely, if the release force is too light, the label will peel off from the release sheet when it is not needed.

[0006] The method of temporarily bonding the thermoplastic resin by heat fusion is based on the feasibility of the pseudo-bonding, that is, the label is finally mounted on the backing paper due to fluctuations in manufacturing conditions such as the resin temperature during lamination, the nip pressure, and the rotation speed of the nip roll. The peeling force when peeling from a certain release paper greatly changes. Therefore, in the production of the pseudo-adhesive laminate by this method, the above conditions are strictly controlled, but at present, poor quality may occur due to partial or subtle temperature differences. .

[0007] On the other hand, generally known pressure-sensitive adhesive labels in which a surface substrate, a pressure-sensitive adhesive and a release substrate are laminated are well known and widely used. Have different purposes and quality designs.

The purpose of use of these adhesive labels is to adhere the labels to adherends, and the adhesive strength is usually
100 g of normal adhesive strength specified in JIS-Z-0237
/ 25 mm to 1000 g / 25 mm, and various adhesive strength levels are designed depending on the application. When an adhesive designed for these applications is used in the field of the present invention, due to the adhesive layer having adhesiveness, various problems occur, and it is necessary to eliminate the adhesiveness. Become. It is considered that eliminating the adhesive force is basically not so difficult, that is, it can be achieved by inhibiting the flowability of the adhesive for the adhesive layer to adhere to the adherend. For example, the glass transition temperature (T
g) may be raised to a normal temperature range and chemically inhibited, or a method of physically inhibiting by increasing the molecular weight. However, the pressure-sensitive adhesive obtained by these methods suffers from the problem that the adhesiveness (anchoring property) to the base material is impaired, and the pressure-sensitive adhesive layer is worn down when used.

[0009]

DISCLOSURE OF THE INVENTION The present invention provides a conventional pseudo-adhesion layer which is easy to manufacture, has a stable peeling force in terms of quality, and has no adhesive force which causes a defect in the pseudo-adhesion layer. Provided is a pseudo-adhesive sheet laminate that can be used at all like a laminated sheet.

[0010]

In order to propose a new quasi-adhesive sheet laminate which can solve the above-mentioned problems, the present inventors have studied various kinds of pressure-sensitive adhesives which have not been conventionally suitable for quasi-adhesives. As a result, they found that the pressure-sensitive adhesive that had not been used as a pseudo-adhesive had appropriate conditions, and completed the present invention. That is, in the case of setting using an adhesive,
The problem is that the adhesive strength is extremely low (almost no) and the anchoring property to the substrate is contradictory. The present inventors optimize the molecular weight and glass transition temperature of the adhesive and use it together with a crosslinking agent. As a result, the above problem can be solved at the same time, and it has been found that the pseudo-adhesive sheet laminate obtained by the formulation has stable peeling quality without being affected by the fluctuation of the manufacturing conditions.

That is, the present invention provides a quasi-adhesive sheet laminate obtained by laminating a surface substrate (A), a quasi-adhesive layer (B), and a mount (C), wherein the quasi-adhesive layer contains an adhesive as a main component. A pseudo-adhesive sheet laminate characterized in that the pseudo-adhesive layer (B) that appears when the surface substrate (A) or the backing sheet (C) is peeled off shows little tackiness. The pseudo-adhesion layer (B) appearing when the surface substrate (A) or the backing sheet (C) is peeled off is formed by an inclined ball tack evaluation method (JIS).
Z 0237), the adhesive strength at an angle of 10 degrees is equal to the ball No. It is preferably 5 or less, or the normal adhesive strength specified in JIS-Z-0237 is 2 g / 25 mm or less. The pressure-sensitive adhesive contains a functional group, and has a polymerization average molecular weight (Mw) of 300,000 to 1,500,000 and a glass transition temperature (Tg) of -40 ° C to -70 ° C. It is a pseudo adhesive sheet laminate comprising a polymer and a crosslinking agent. Further, when the functional group is a hydroxyl group and the crosslinking agent is an isocyanate-based curing agent, the anchoring property to a substrate (hereinafter, the surface substrate and the backing sheet are collectively referred to as a substrate) is good, which is more preferable.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The pressure-sensitive adhesive used in the present invention is not particularly limited as long as it is sufficiently anchored to a substrate and has almost no tackiness.
That is, the pseudo-adhesive layer (B) containing an adhesive when the surface substrate (A) or the backing sheet (C) is peeled off needs to exhibit almost no tackiness. For example, when the pseudo adhesive layers come into contact with each other after peeling, the two do not adhere to each other. Specifically, the quasi-adhesive layer (B) is formed by the inclined ball tack evaluation method (JIS Z).
[0237] The adhesive strength at an angle of 10 degrees according to ball No. 5 or less, more preferably ball No. 3 or less. Ball No. In the case of 6 or more, the pseudo-adhesive layer after peeling shows tackiness, and there is a problem that the pseudo-adhesive layer sticks to an unintended location. As another standard, JIS-Z
It is preferable that the normal adhesive strength specified in -0237 is 2 g / 25 mm or less. However, in this measurement method, when the value becomes small, the error becomes large. Therefore, it is preferable to perform the evaluation by the inclined ball tack evaluation method.

In order for the quasi-adhesive layer to satisfy these required qualities, the pressure-sensitive adhesive must contain a functional group, and have a Mw of 300,000 to 1,500,000 and a Tg of -40 ° C to -70 ° C. It can be easily achieved by using a combination of a copolymer and a crosslinking agent. Further, it is more preferable that the functional group is a hydroxyl group and the crosslinking agent is an isocyanate-based curing agent because the anchoring property to the substrate is good.

In the present invention, it does not matter whether the pseudo-adhesive layer is anchored to the surface substrate side, for example, a neck-hanging label substrate, or to the base material side, which is the backing paper. In the former case, there is a case where the pressure-sensitive adhesive layer is provided on the back surface of the label, but since there is almost no tackiness, no problem occurs. Conversely, in the latter case, a release agent layer accompanies the label back,
Similarly, no trouble occurs. However, the latter is a more preferred embodiment in consideration of the adhesion of dust and the like to the back surface of the label.

The following are examples of monomers for obtaining the polyacrylate copolymer. n-butyl (meth)
Acrylate, i-butyl (meth) acrylate, n-
C4 such as hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, and i-octyl (meth) acrylate
(Meth) acrylic acid alkyl ester monomers having from 14 to 14 alkyl groups.

Examples of monomers having a functional group include α, β-unsaturated mono- or di-carboxylic acid monomers such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid and citraconic acid, acrylamide, Methacrylamide, N, N-dimethylmethacrylamide, N-methylacrylamide, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, aminoethyl acrylate, N, N-dimethylaminoethyl acrylate, N, N-diethylaminoethyl acrylate, aminoethyl methacrylate,
N, N-dimethylaminoethyl methacrylate, N, N
-Diethylaminoethyl methacrylate, glycidyl acrylate, glycidyl methacrylate, vinyl mercaptan, allyl mercaptan, (poly) ethylene glycol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate,
1,6-hexanediol diacrylate, allyl acrylate, triallyl cyanurate, triallyl isocyanurate, diallyl phthalate, divinylbenzene,
(Poly) amide or substituted amide group such as ethylene glycol dimethacrylate, neopentyl glycol dimethacrylate, trimethylolpropane trimethacrylate, 1,6-hexanediol dimethacrylate, allyl methacrylate, amino group or substituted amino group, hydroxyl group, epoxy A monomer containing at least one functional group such as a group, a mercapto group and a radical polymerizable unsaturated group in one molecule.

Further, the following monomers copolymerizable with the above-mentioned monomers can be used if necessary. Methacrylic acid such as acrylate having 1 to 3 carbon atoms in the alkyl group such as methyl acrylate, ethyl acrylate, n-propyl acrylate, i-propyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, i-butyl methacrylate Esters can be mentioned. Also, dimethyl malate,
Di-n-butyl maleate, di-2-ethylhexyl malate, di-n-octyl malate, dimethyl fumarate, di-n-butyl fumarate, di-2-ethylhexyl fumarate, di-n-octyl fumarate and the like And saturated fatty acid vinyl esters such as vinyl acetate, vinyl propionate and vinyl versatate.

The mixing ratio of the monomers is not particularly limited, except that one or more functional group-containing monomers are mixed.
However, in consideration of the tackiness of the obtained pseudo-adhesive layer and the anchoring property to the substrate, it is preferable that the blending amount of the functional group-containing monomer is relatively large, and the Tg of the obtained pressure-sensitive adhesive polymer is −40 to −70. It is necessary to adjust to ° C. When Tg exceeds -40 ° C, the anchoring property of the pressure-sensitive adhesive to the substrate is poor.
Conversely, when the temperature is lower than -70 ° C, it becomes difficult to control the adhesiveness.

In the present invention, the Tg of the polyacrylate copolymer is a value measured and determined using a differential scanning calorimeter (DSC), and the type of monomer used for preparing the copolymer and From the weight fraction in the monomer mixture, for example, Lawrence E.C. Nielsen
Written by Shigeharu Onoki, "Mechanical Properties of Polymers" (1st edition, 9th edition)
According to the description on pages 26-27, 1970, Kagaku Doujinshi), it can be calculated by the following formula, whereby the approximate glass transition temperature of the copolymer obtained before the actual copolymerization is carried out is estimated. What can be done is well known in the art. 1 / Tg = Wt1 / Tg1 + Wt2 / Tg2 +... + W
tn / Tgn In the above formula, Tg: glass transition temperature of copolymer (° K) Tg1: glass transition temperature of homopolymer of monomer 1 (° K) Tg2: glass transition temperature of monomer 2 Glass transition temperature (° K) Tgn: Glass transition temperature of homopolymer of monomer n (° K) Wt1: Weight fraction of monomer 1 Wt2: Weight fraction of monomer 2 Wtn: Monomer n represents the weight fraction of each.

The glass transition temperature of the homopolymer of the monomer used herein is described, for example, in J. Am. brandru
p, E. H. Immergut POLYMER H
ANDBOOK, Second Edition III
-P. 144 to 155 can be used.

The method of polymerizing each of the monomers is not particularly limited, and includes ordinary solution polymerization, emulsion polymerization, suspension polymerization, bulk polymerization, and the like. Legit is preferred. The Mw of the obtained pressure-sensitive adhesive polymer is 300,000 to 1,500,000, further 500,000 to 1,
It is preferable to adjust to 100,000. If the Mw is less than 300,000, the pressure-sensitive adhesive penetrates the base material and impairs the appearance. Conversely, if it exceeds 1.5 million, the anchoring property of the pressure-sensitive adhesive to the base material is poor. In the present invention, Mw can be easily measured by gel permeation chromatography (GPC).

The Mw of the pressure-sensitive adhesive polymer of the present invention is
Is preferably adjusted by the amounts of the polymerization initiator and the chain transfer agent used. As the polymerization initiator, benzoyl peroxide, azobisisobutyronitrile, tert-butylperoxybenzoate, cumene hydroperoxide, diisopropylperoxydicarbonate, di-
General oil-soluble initiators such as n-propyl peroxy dicarbonate, tert-butyl peroxy neodecaate, dilauroyl peroxide, dipropionyl peroxide, diacetyl peroxide are preferable, and potassium persulfate, ammonium persulfate, A common water-soluble initiator such as hydrogen peroxide and a combination of a peroxide and a reducing agent, for example, a redox-based initiator composed of ammonium persulfate and sodium hydrogen sulfite can also be appropriately applied.

The amount of the polymerization initiator to be used is about 0.1 to 3 parts by weight based on 100 parts by weight of the acrylic monomer mixture. By the way, if it is less than 0.1 part by weight, Mw tends to be too large, and if it exceeds 3 parts by weight, Mw tends to be too small, which is not an appropriate amount.

Further, as the chain transfer agent, for example, n
-Dodecyl mercaptan, t-dodecyl mercaptan,
n-butyl mercaptan, 2-mercaptoethanol,
Examples thereof include 2-ethylhexyl thioglycolate and trichlorobromomethane. The amount used is about 0.001 to 0.1 part by weight based on 100 parts by weight of the acrylic monomer mixture. By the way 0.00
If it is less than 1 part by weight, Mw tends to be too large, and if it exceeds 0.1 part by weight, Mw tends to be too small, which is not an appropriate amount.

The crosslinking agent has two or more functional groups in one molecule which react with the functional groups in the pressure-sensitive adhesive. Examples thereof include isocyanate-based crosslinking agents, oxazoline-based crosslinking agents, and epoxy-based crosslinking agents. And imine-based crosslinking agents, glycidyl ethers of polyhydric alcohols and hydrazide-based crosslinking agents, polycarbodiimide-based crosslinking agents, metal chelate-based crosslinking agents, and the like. Since the number of parts of the crosslinking agent greatly affects the adhesion of the obtained pseudo-adhesive layer, it is preferable to add at least 1 part by weight or more, more preferably 5 parts by weight or more based on 100 parts by weight of the acrylate copolymer.

In order to improve the anchoring property of the pseudo adhesive layer to the substrate, which is one of the problems in the present invention, it is preferable that the reaction between the functional group in the pressure-sensitive adhesive and the functional group in the crosslinking agent be slow. It is. This is presumably because the permeability of the pressure-sensitive adhesive polymer into the base material affects its anchoring property, and the permeability decreases when the apparent molecular weight increases due to crosslinking. From this viewpoint, the present inventor has studied various combinations of the functional group and the cross-linking agent of the pressure-sensitive adhesive. As a result, although the reason is not known, the result is that the combination of the functional group is a hydroxyl group and the cross-linking agent is particularly preferable. Brought.

To produce the pseudo-adhesive sheet laminate of the present invention, the usual method for producing a pressure-sensitive adhesive sheet can be applied as it is. That is, the pressure-sensitive adhesive of the present invention is applied to a coating machine such as a comma coater, a roll coater, a gravure coater, a lip coater, a knife coater, or a bar coater, which is a usual pressure-sensitive adhesive coating device, or a screen printing machine or a gravure printing machine. The pseudo-adhesive sheet of the present invention is applied by applying the paint to the back surface of the front substrate (A) / or the backing sheet (C), and after drying, bonding the backing sheet to the backing sheet of the backing sheet (C) / or the backing sheet (A). A laminate is obtained. The coating thickness of the pseudo adhesive layer is not particularly limited, but is usually 1 to 50 g / m ² , preferably 5 to 50 g / m ² in dry weight.
About 30 g / m ² .

The substrate of the surface substrate (A) and the substrate (C) used in the present invention are not particularly limited, but the following substrates are appropriately selected according to the use and purpose. That is, for example, printing paper such as art paper, coated paper, cast paper, and high-quality paper is generally provided on the surface substrate (A) serving as a neck-hanging label. Paper,
Information recording paper such as thermal transfer recording paper, ink jet recording paper, carbon copy paper, and electrophotographic recording paper can be used. As the material, general paper base material, synthetic paper, PET,
General film base materials such as PP and PE, and their bonded base materials can also be applied. A treatment layer such as a metal deposition layer may be formed. When the surface substrate is a paper substrate and the back surface is subjected to a release treatment, a double-coated paper or a water-soluble polymer material as a main component is used in order to prevent penetration during release agent application. It is preferable to use a substrate having a stop layer formed on the lamination surface.

On the other hand, as the base material of the mount (C), a general paper base material, synthetic paper, a general film base material such as PET, PP, PE, etc., and a bonded base material thereof can be applied as the material. For example, a base material for release paper that is usually used for an adhesive sheet can be applied as it is. For example, polylaminate paper or glassine paper obtained by laminating PE on high-quality paper, paper base material obtained by laminating a filling layer mainly composed of a water-soluble polymer material on high-quality paper, synthetic paper, PET, PP, PE, etc. Film bases are exemplified. However, among the above-mentioned base materials for release paper, when used for a labeler or the like, glassine paper, a transparent film, or the like is preferable in consideration of phototube suitability and the like.

When a release treatment is applied to the surface substrate or the backing paper,
A known release agent usually used for a pressure-sensitive adhesive sheet can be applied. However, since the pseudo-adhesive layer has almost no adhesive force, a release agent suitable for it is necessary. Specifically, silicone-based, fluorine-based, alkyd resin-based and the like can be mentioned, but silicone-based is preferred from the viewpoint of adjusting the peeling force. As a coating method of the release agent, for example, a general coating machine such as a bar coater or a gravure coater is used to coat the base material for the mount or the base material for the surface material with a coating amount of about 0.1 to 5 g / m ^2. It is obtained by coating and drying.

The pseudo-adhesive sheet laminate of the present invention comprises:
The present invention is not limited to the neck hanging label, and can be applied to various uses, for example, as an information recording sheet, or as an adhesive label having a rear surface subjected to adhesive processing.

[0032]

The present invention will be described in more detail with reference to the following Examples, but it should be understood that the present invention is by no means restricted thereto. In addition, all the material mixing parts in an Example show a solid content weight part.

Example 1 <Manufacture of Surface Substrate> Addition type silicone (BY24-312: Dow Corning Toray Silicone) on one side of double-sided art paper (gold both <73>: manufactured by Oji Paper) having a basis weight of 84 g / m ² Co., Ltd.) and a silicone solution prepared by dissolving 30 parts by weight of a catalyst (SRX-212: manufactured by Dow Corning Toray Silicone) in toluene with a bar coater to a dry weight of 1 g / m ² and drying (drying). The temperature was 120 ° C.) to obtain a surface substrate.

<Production of pressure-sensitive adhesive paint> Polymerization of pressure-sensitive adhesive 95 parts by weight of 2-ethylhexyl acrylate, 3 parts by weight of 2-hydroxyethyl methacrylate, 2 parts by weight of methyl methacrylate, 1 part by weight of benzoyl peroxide, 0 part of n-dodecyl mercaptan A mixture of 0.011 parts by weight is reacted in toluene at a temperature of 70 ° C. for 8 hours. The obtained pressure-sensitive adhesive contains a hydroxyl group, Mw 800,000, Tg-63 ° C,
The solid concentration was 40%. Preparation of Pressure-Sensitive Adhesive With respect to 100 parts by weight of the pressure-sensitive adhesive, 6 parts by weight of an isocyanate-based curing agent (Coronate HL: manufactured by Nippon Polyurethane Industry Co., Ltd.) was added to the crosslinking agent to obtain a pressure-sensitive adhesive paint.

<Manufacture of Pseudo-Adhesive Sheet Laminate> The above-mentioned pressure-sensitive adhesive paint was applied to the silicone-coated side of the above surface substrate with a comma coater to a dry weight of 20 g / m ² and dried (drying temperature 100 ° C.). Then, a release base material having a basis weight of 70 g / m ² (glassine base paper G70
W: Oji Paper Co., Ltd.) to obtain a pseudo-adhesive sheet laminate.

Example 2 <Manufacture of pressure sensitive adhesive coating> Polymerization of pressure sensitive adhesive 2-ethylhexyl acrylate 75
Parts by weight, 5 parts by weight of acrylic acid, methyl methacrylate 20
A pressure-sensitive adhesive was obtained in the same manner as in Example 1, except that 1 part by weight, 1 part by weight of benzoyl peroxide, and 0.02 part by weight of n-dodecylmercaptan were used. The resulting pressure-sensitive adhesive contains a carboxyl group, Mw 300,000, Tg-44 ° C, solid content concentration 40%
Met. Preparation of pressure-sensitive adhesive paint To 100 parts by weight of the pressure-sensitive adhesive, 7 parts of an epoxy-based crosslinking agent (Denacol EX-421: manufactured by Nagase Kasei Co., Ltd.) was added to obtain a pressure-sensitive adhesive paint. <Preparation of pseudo-adhesive sheet laminate> A pseudo-adhesive sheet laminate was obtained in the same manner as in Example 1 except that the above-mentioned pressure-sensitive adhesive paint was used.

Example 3 <Manufacture of release substrate> 30 weights of addition type silicone (BY24-312: manufactured by Dow Corning Toray Silicone) on one side of glassine base paper (G70W: manufactured by Oji Paper) having a basis weight of 70 g / m ^2. Of a catalyst (SRX-212: manufactured by Dow Corning Toray Silicone Co., Ltd.) and a silicone solution prepared by dissolving 1 part by weight in toluene with a bar coater to a dry weight of 1 g / m ² and drying (drying temperature: 120 ° C.) Then, a release substrate to be used as a mount was obtained.

<Production of pressure sensitive adhesive paint> Polymerization of pressure sensitive adhesive 2-ethylhexyl acrylate 98
A pressure-sensitive adhesive was obtained in the same manner as in Example 1, except that 2 parts by weight, 2 parts by weight of 2-hydroxyethyl methacrylate, 1 part by weight of benzoyl peroxide, and 0.005 part by weight of n-dodecylmercaptan were used. The obtained pressure-sensitive adhesive had a hydroxyl group, Mw of 1.5 million, Tg-66 ° C., and a solid concentration of 40%. Preparation of pressure-sensitive adhesive paint 3 parts of coronate HL were added to 100 parts by weight of the pressure-sensitive adhesive to obtain a pressure-sensitive adhesive paint. <Production of Pseudo-Adhesive Sheet Laminate> On the silicone-coated side of the release substrate, apply the above-mentioned adhesive paint on a dry weight of 10 g / m ^2.
Is applied and dried (drying temperature 90 ° C.) with a comma coater, and then the basis weight of the pressure-sensitive adhesive layer and the surface substrate becomes 8
The side of the base paper of 4 g / m ² single-sided art paper (gold piece <73>: manufactured by Oji Paper) was bonded to obtain a pseudo-adhesive sheet laminate.

Comparative Example 1 <Production of Pseudo-Adhesive Sheet Laminate> A single-sided art paper having a basis weight of 84 g / m ² (gold piece <73>: manufactured by Oji Paper) was subjected to lamination at a die temperature of 330 ° C. on the base paper side. A polyethylene resin was formed to a thickness of 15 μm, and a polyethylene resin having a thickness of 15 μm was formed on this surface at a temperature of 270 ° C. to obtain a glassine base paper (G70) having a basis weight of 70 g / m ^2.
W: Oji Paper Co., Ltd.) to obtain a pseudo-adhesive sheet laminate.

Example 4 <Production of pressure sensitive adhesive paint> Polymerization of pressure sensitive adhesive 2-ethylhexyl acrylate 9
5 parts by weight, 2-hydroxyethyl methacrylate 3 parts by weight, methyl methacrylate 2 parts by weight, benzoyl peroxide 4
A pressure-sensitive adhesive was obtained in the same manner as in Example 1, except that 0.2 parts by weight of n-dodecyl mercaptan and 0.2 parts by weight were used. The obtained pressure-sensitive adhesive had a hydroxyl group, Mw of 100,000, Tg of −63 ° C., and a solid content of 40%. Preparation of pressure-sensitive adhesive paint A pressure-sensitive adhesive paint was obtained in the same manner as in Example 3 except that the above-mentioned pressure-sensitive adhesive was used. <Production of pseudo-adhesive sheet laminate> A pseudo-adhesive sheet laminate was obtained in the same manner as in Example 3 except that the above-mentioned pressure-sensitive adhesive paint was used.

Example 5 <Manufacture of Pressure-sensitive Adhesive Paint> Polymerization of pressure-sensitive adhesive 2-ethylhexyl acrylate 7
An adhesive was obtained in the same manner as in Example 1, except that 0 parts by weight, 5 parts by weight of 2-hydroxyethyl methacrylate, 25 parts by weight of methyl methacrylate, and 1 part by weight of benzoyl peroxide were used. The obtained pressure-sensitive adhesive contains a hydroxyl group and has a Mw of 180.
10,000, Tg-36 ° C., solid content concentration 40%. Preparation of pressure-sensitive adhesive paint A pressure-sensitive adhesive paint was obtained in the same manner as in Example 1 except that the above-mentioned pressure-sensitive adhesive was used. <Production of pseudo-adhesive sheet laminate> A pseudo-adhesive sheet laminate was obtained in the same manner as in Example 1 except that the above-mentioned pressure-sensitive adhesive paint was used.

The peelability of the pseudo-adhesion portion, the adhesion of the pseudo-adhesion layer, the anchoring property between the substrate and the pseudo-adhesion layer, the appearance of the substrate, and the suitability for the labeler of the pseudo-adhesive sheet laminate thus obtained were evaluated by the following methods. Was determined.

<Tackiness of pseudo adhesive surface 1> JIS-Z-
The adhesive strength was measured by an inclined ball tack evaluation method at an angle of 10 degrees according to 0237. The measurement result (ball number) is described.

<Tackiness of pseudo adhesive surface 2> JIS-Z-
The normal adhesive force to the SUS plate is measured according to 0237. "Criteria for judging tackiness of pseudo-adhesive surface" Based on the results of measuring the tackiness of the pseudo-adhesive surface, the degree to which no tackiness was felt was determined to be a measured value of 2 g / 25 mm or less, and the following determination was made. ：: 2 g / 25 mm or less. X: Exceeds 2 g / 25 mm.

<Peeling Force> A sample was prepared with a width of 5 cm and a length of 20 c.
m. 30 in 180 degree direction with tensile tester
The surface substrate is peeled off at a constant speed of cm / min. The peel strength at that time is measured. The average value and the range of fluctuation were calculated for 20 measurement samples, and judged according to the following criteria. <Releasability> From the results of the above-mentioned peeling force measurement, the releasability was determined according to the following criteria. ：: average value 20 g / 5 cm to 50 g / 5 cm. And the fluctuation width is 20 g / 5 cm or less. ×: Either the above average value or fluctuation range is out of the range.

<Substrate anchoring property (substrate adhesion)> The pseudo-adhesive layer was rubbed with a finger (5 reciprocations) and evaluated according to the following criteria. "Criteria" ：: The pseudo adhesive layer does not fall off the base material. Δ: A level at which the pseudo-adhesion layer is slightly removed from the base material, but has no practical problem. X: The pseudo-adhesion layer falls off the substrate.

<Appearance of Substrate> The surface of the substrate was visually observed and judged according to the following criteria. "Judgment criteria" ：: No abnormality. X: The pseudo-adhesion layer was observed in a spot-like manner, and the appearance was poor.

<Suitability of Labeler> Using a labeler, 100 labels were fed at a speed of 100 / min, and the label feeding stability was determined according to the following criteria. "Judgment Criteria" A: All 100 sheets were fed without any problem. X: Label feeding failure occurred even with one sheet.

<Comprehensive Evaluation Judgment Criteria> ：: All are acceptable. Δ: Although exfoliation is excellent, other quality is inferior. X: The peelability is extremely poor.

[0050]

[Table 1]

[0051]

As is clear from the table, by applying the pressure-sensitive adhesive of the present invention (having almost no tackiness) to the pseudo-adhesive layer of the pseudo-adhesive sheet laminate, the pseudo-adhesion by the conventional polyethylene melt lamination method was carried out. It is possible to stabilize the peeling force, which has been a problem of the sheet laminate. In addition, by effectively using the pressure-sensitive adhesive and the crosslinking agent having a degree of polymerization and a glass transition temperature in the specific range shown in the present invention, good quality including the base material adhesion other than the releasability, the base material appearance, etc. Can be obtained. Further, the pseudo-adhesive sheet laminate of the present invention is not limited to a neck label, but can be applied to various pseudo-adhesive products.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of a pseudo adhesive sheet laminate.

FIG. 2 is a cross-sectional view illustrating another example of a pseudo adhesive sheet laminate.

FIG. 3 is a cross-sectional view illustrating still another example of the pseudo adhesive sheet laminate.

[Explanation of symbols]

 1: Pseudo-adhesive sheet laminate A: Surface substrate B: Pseudo-adhesive layer C: Mount D: Release treatment

Claims (6)

[Claims] 1. A pseudo-adhesive sheet laminate comprising a surface substrate (A), a pseudo-adhesive layer (B), and a backing sheet (C), wherein the pseudo-adhesive layer is a layer containing an adhesive as a main component. A pseudo-adhesive sheet laminate characterized in that the pseudo-adhesive layer (B) appearing when the surface substrate (A) or the backing sheet (C) is peeled off shows little tackiness. 2. A pseudo-adhesion layer (B) appearing when the surface base material (A) or the backing paper (C) is peeled off, is adhered at an angle of 10 degrees according to the inclined ball tack evaluation method (JIS Z 0237). If the ball is no. The pseudo adhesive sheet laminate according to claim 1, wherein the number is 5 or less. 3. The quasi-adhesive layer (B) appearing when the surface substrate (A) or the backing (C) is peeled off is JIS-Z-0237.
2. The quasi-adhesive sheet laminate according to claim 1, wherein the normal adhesive strength specified in (1) is 2 g / 25 mm or less. 4. The method according to claim 1, wherein a release treatment (D) is performed on a surface of the surface substrate (A) on which the pseudo adhesive layer (B) is formed. The laminate of the above-mentioned pseudo adhesive sheet. 5. A polyacrylate copolymer having a functional group, a polymerization average molecular weight (Mw) of 300,000 to 1,500,000 and a glass transition temperature (Tg) of -40 to -70 ° C. 2. The method according to claim 1, comprising a coalescence and a crosslinking agent.
The pseudo-adhesive sheet laminate according to any one of claims 4 to 4. 6. The pseudo-adhesive sheet laminate according to claim 5, wherein said functional group is a hydroxyl group, and said crosslinking agent is an isocyanate-based crosslinking agent.