JP3514819B2 - Delayed label - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to beer bottles, beer cans,
The present invention relates to a delayed label (including tack seal) used for heating and fusing a packaging container such as a liquor bottle, a juice can, an ampoule bottle, and a carbonated beverage container.

[0002]

2. Description of the Related Art A pressure-sensitive adhesive label in which a pressure-sensitive adhesive is provided on the back surface of a base material sheet on which patterns such as products, product names, manufacturers, prices, etc. are printed and the pressure-sensitive adhesive surface is covered with release paper. Is known. This pressure-sensitive adhesive label is convenient for storage, but it is necessary to peel off the release paper from the label when attaching it to the container, and it takes labor to dispose of the release paper.
When the pressure-sensitive adhesive label is rolled, the diameter of the roll is increased by the thickness of the release paper.

In order to improve such a defect, a backside of a base sheet is coated with a heat-sensitive adhesive which does not exhibit tackiness at room temperature (10 to 30 ° C.), and the opposite surface is printed with a delayed label (heat-sensitive adhesive). Adhesive labels have been proposed and put into practical use (Japanese Patent Publication No. 5-18433, JP-A 1-2).
No. 22290, No. 4-72125, No. 5-3
No. 2241, No. 6-27881, No. 6-10
No. 0847 and No. 6-100848). Examples of the base sheet include pulp paper, rayon paper, pigment coated paper, and synthetic paper.

The heat-sensitive adhesive of this delayed label does not exhibit adhesiveness at room temperature, but is activated by being heated. This delayed label is attached to the container using, for example, the labeling machine shown in FIG. Specifically, the rolled delayed label (1) is sandwiched by the feeding roller (3) and the pressure bonding roller (4) from the label feeding section (2), and by the rotation of these rollers (3) and (4). The position of the delayed label was confirmed by the optical sensor (5) being fed out, the label was cut to the label size between the die-cut roll (6) and the anvil (7) having the suction hole, and the cut label (8) was It is sucked by the anvil (7) and sent in the direction of the transfer drum (10). (9) is scrap with the label cut out.

The transfer drum (10) transfers the label (8) from the anvil (7), and transfers the label (8) by the heating mechanism (11).
When heated to 0 to 100 ° C., the heat-sensitive adhesive of the label (8) becomes active, and the label is attached to the body of the container (13) sent by the container transport mechanism (12).

[0006] These delayed labels do not exhibit tackiness at room temperature, and the heat-sensitive adhesive layer is activated by heating, and therefore, they are applied to the adherend such as containers, metal plates, woven fabrics, glass plates, etc. The adhesive strength when applied is high, and when it is rolled and stored, it is easy to rewind without sticking when it is applied to the adherend using a labeler machine, and this heat-sensitive adhesive It is required that the agent layer does not delaminate the printing of the delayed label.

Therefore, in order to prevent this blocking, the rolled delayed label has a room temperature of 10 to 20 ° C. in the storage room during the season when the temperature may exceed 30 ° C. from June to September. Temperature and humidity 35-35
It is adjusted to 60% and stored. Room temperature is 35-50
This is because when the temperature becomes as high as ℃, blocking occurs, a part of the print is peeled off at the time of rewinding, and the adhesive force to the substrate is affected by humidity. When the base sheet has hygroscopicity such as pulp paper and rayon fiber paper, it is necessary to control humidity.

[0008]

SUMMARY OF THE INVENTION According to the present invention, it is not necessary to adjust the temperature and humidity during storage of a roll-wound delayed label, and the work for attaching the adherend to the delayed label is performed at high speed. In order to set the heating temperature to 100-125
The purpose of the present invention is to provide a delayed label in which the label does not shrink due to a high temperature of ℃.

[0009]

DISCLOSURE OF THE INVENTION The present invention relates to a delayed label having a base sheet with printing on the front surface and a heat-sensitive adhesive layer on the back surface, wherein the base sheet contains an inorganic fine powder. A uniaxially stretched product of a propylene-based resin film containing a microporous film made of a biaxially stretched resin film as a base layer (A) and containing 0 to 55% by weight of an inorganic fine powder having an average particle diameter of 0.05 to 3 μm. A laminated label having the following surface layer (B), wherein the printed surface layer (B) satisfies the following conditions (1) to (3).

The center plane average roughness (SRa) measured according to JIS B0601 is 0.20 to 0.38 μm, the center plane peak height (SRp) is 3.0 to 8.5 μm, and the center plane valley depth (SRv) is The roughness is 2.0 to 4.0 μm. The surface smoothness (Beck index) measured according to JIS P8119 is 400 to 1,200 seconds. The surface strength in the longitudinal direction is 1 to 10 kg · cm.

[0011]

The function of the printed surface of the base material sheet is such that the smoothness is such that blocking is prevented without impairing printability,
Since a base material sheet that has a surface strength that is adjusted to the surface roughness and that does not peel off the print due to the adhesive force of the heat-sensitive adhesive layer when the roll-type delayed label is rewound is used, Even a label containing fine powder does not cause paper dust trouble.

(Summary of the Invention) Base Sheet A base sheet for a delayed label has a microporous film made of a biaxially stretched propylene-based resin film containing an inorganic fine powder as a base layer (A), and an average grain size. A laminated film comprising a uniaxially stretched propylene resin film containing 0 to 55% by weight of an inorganic fine powder having a diameter of 0.05 to 3 μm as a surface layer (B), which is subjected to printing. (B) satisfies the following conditions (1) to (4).

The center plane average roughness (SRa) measured according to JIS B0601 is 0.20 to 0.38 μm, the center plane peak height (SRp) is 3.0 to 8.5 μm, and the center plane valley depth (SRv) is The roughness is 2.0 to 4.0 μm. The surface smoothness (Beck index) measured according to JIS P8119 is 400 to 1,200 seconds. The surface strength in the longitudinal direction is 1 to 10 kg · cm.

The propylene resin as the resin material includes propylene homopolymer, propylene / ethylene copolymer,
Propylene / butene-1 copolymer, propylene / ethylene / butene-1 copolymer, propylene / 4-methylpentene-1 copolymer, propylene / 3-methylpentene-
1 copolymer and the like. The copolymer may be a random copolymer or a block copolymer. A resin having a melting point lower than that of polypropylene, such as polyethylene, polystyrene, and ethylene-vinyl acetate copolymer, may be added to these propylene-based resins in an amount of 3 to 25% by weight in order to improve stretchability.

As the inorganic fine powder, calcium carbonate, calcined clay, silica, diatomaceous earth, talc, titanium oxide, barium sulfate and the like having a particle size of 0.03 to 3 μm are used. The content of the inorganic fine powder in the base layer (A) is 8 to 40% by weight, preferably 15 to 33% by weight,
The content of the surface layer (B) is 0 to 55% by weight, preferably 8 to 30% by weight. When the content of the inorganic fine powder in the surface layer is small, the thickness of the surface layer (B) is 0.5 to 3 μm.
m, so that the shape of the unevenness on the surface of the base layer (A), which is a rough surface due to the influence of the inorganic fine powder present in the base layer (A), is transferred to the surface of the surface layer (B).

The stretching ratio is preferably 4 to 10 times in both the longitudinal and transverse directions, and the stretching temperature is 3 to more than the melting point of the propylene resin.
The temperature is 30 ° C. lower and higher than 135 ° C. The biaxially stretched film of the base layer of this substrate sheet,
It is a stretched propylene resin film having many fine voids inside the film. Due to the presence of the void, the label has a heat insulating property, and the heating mechanism of the labeling machine (1
Even if the delayed label is heated in 1), no thermal contraction occurs.

Further, since the resin material of the base sheet of the label is a propylene-based resin and stretching is performed at a temperature higher than 135 ° C., a synthetic paper made of a biaxially stretched film of high density polyethylene containing inorganic fine powder, The heating temperature of the label is 100 ° C or less, like a delayed label that uses a synthetic paper with a pigment coating layer on the surface of a biaxially stretched film of polyethylene terephthalate or polystyrene (stretching temperature is 85 to 120 ° C). Since the label does not need to be heat-shrinked even at a label heating temperature of up to about 130 ° C., the label sticking speed to the adherend can be improved. The amount of fine voids in the base sheet is 5 to 35%, preferably 5 to 25% in terms of porosity calculated by the following formula.

[0018]

[Formula 1]

The base sheet may be a laminated film having a three-layer structure in which the surface layer (B) is provided on both surfaces of the base layer (A), and the base layer (A) and the surface layer (B) are laminated together. The other resin layer may be present. Furthermore, the surface layer contains
In order to improve the offset printability or to impart antistatic property to the label, polyethyleneimine, poly (ethyleneimine-urea), ethyleneimine adduct of polyamine polyamide, epichlorohydrin adduct of polyamine polyamide, tertiary to It may be coated with a water-soluble primer selected from the group consisting of quaternary nitrogen-containing acrylic resins.

The wall thickness of the primer is 0.2 to 5 μm. The thickness of the base layer (A) is 30 to 120 μm, the thickness of the surface layer (B) is 0.5 to 50 μm, and the thickness of the base sheet is 50 to 150 μm, preferably 60 to 120 μm.
Is. The surface roughness of the surface layer (B) of the substrate sheet is a marking parameter in the microscopic visual field, and the surface smoothness (the larger the number of seconds, the better the smoothness) is the marking parameter in the macroscopic visual field.

Center surface average roughness (SRa) is 0.20 μm
If the height of the center surface (SRa) is less than 3.0 μm and the Beck index is 1,200 seconds or more, the anti-blocking effect when rewinding the rolled delayed label is small. Since it needs to be stored at a temperature of ℃ or less, it has no merit compared to conventional products.

If SRa exceeds 0.38 μm, SRp exceeds 8.5 μm, or Beck index is less than 400 seconds, the effect of preventing paper dust trouble (falling of inorganic fine powder from the base sheet) is not sufficient. Rolled delay
White spots appear on the print when the label is rewound. The center plane valley depth (SRv) is a value between approximately 0.20 to 4.0 μm when the center plane height (SRp), the center plane average roughness (SRa) and the value of the Beck index are determined.

When the content of the inorganic fine powder in the surface layer (B) is large, or when the surface layer is a biaxially stretched film, the surface strength is low, and the heat-sensitive adhesive layer of the heat-sensitive adhesive layer is unwound when the rolled delayed label is unwound. Printing may be peeled off from the substrate sheet due to the adhesive force, so the surface strength of the surface layer (B) is set to 1 kg / cm ² or more in both the longitudinal and lateral directions. The surface strength depends on the type of resin, the type of inorganic fine powder, the average particle size, the particle size distribution, the content, the drawing temperature, the draw ratio and the like. Also, it depends on the calendering conditions for making the surface of the base material sheet smoother by compressing the surface with a roll after the base material sheet is manufactured.

This surface strength was measured by using an internal bond tester manufactured by Kumagai Riki Kogyo Co., Ltd., and a width of 18 mm was measured at the center of the front and back surfaces of the base sheet sample (14) (25.4 mm long, 45 mm wide). Sumitomo 3M's adhesive tape “Scotch Clear Tape” (trade name) (1
5) and (15 ') were adhered without adhering 15 mm to the end side, which was used as a sample and fixed on the boulder 16 of the internal bond tester as shown in FIG. 2 (see FIG. 2).
a), fix it with another adhesive tape (15 "), put the aluminum angle (17) on it, and bend the adhesive tape (15) on the aluminum angle (17) as shown in FIG. 2b. Then, it is fixed with another adhesive tape (15 ″), and a load of 1 kg is applied to the sample for 1 minute. Then, after adjusting the zero position, press the pendulum (18) with a weight and push the button to swing it down by 90 degrees (Fig. 2b).
The value of the energy indicated by the needle (19) when a part (15) of the sample was peeled together with the aluminum angle by impacting the aluminum angle was read by the scale (20).

When the surface strength is less than 1 kg · cm, when a delayed label is attached to an adherend using a label machine, a peeling phenomenon occurs in which a part of the printed portion becomes a skin and peels from the label. It is difficult to set the pressure to 10 kg · cm or more from the viewpoint of the material of the surface layer.

Heat Sensitive Adhesive Layer The heat sensitive adhesive layer is, as shown in the above publications,
(A) polyvinyl acetate, poly (n-butyl methacrylate),
Vinyl oxide-vinylidene chloride copolymer, natural rubber, vinyl acetate-2-ethylhexyl acrylate copolymer, vinyl acetate-ethylene copolymer, virpyrrolidone-styrene copolymer, styrene-butadiene rubber, butyl rubber, vinylpyrrolidone -A polymer resin having a glass transition point of 20 ° C or lower, such as an ethyl acrylate copolymer, and (b) diphenyl phthalate, dihexyl phthalate, dicyclohexyl phthalate, bihydroabietyl phthalate, dimethyl isophthalate, benzoic acid. Acid sucrose, ethylene glycol dibenzoate, trimethylolethane tribenzoate, glyceride tribenzoate, pentaerythritol tetrabenzoate, sucrose octaacetate, tricyclohexyl citrate, N-cyclohexyl-p-trienesulfonamide, etc. With a plasticizer that is solid at room temperature, c) Adhesion of rosin derivative (rosin, polymerized rosin, hydrogenated rosin and their esters with glycerin, pentaerythritol, etc., resin acid dimer, etc.) Terpene resin system, petroleum resin system, phenol resin system, xylene resin system, etc. It contains an imparting agent, does not show tackiness at room temperature (10 to 25 ° C.), and is heated (80 to 1 ° C.).
It exhibits activity at 30 ° C. and remains tacky for a while (5 seconds to 2 weeks) even after heating is stopped.

If necessary, an antioxidant, colloidal silica, alumina sol, etc. may be added. The amount of the heat-sensitive adhesive applied to the substrate sheet depends on the material of the adherend and the thickness of the substrate sheet, but is in the range of 8 to 30 g / m ² (solid content).

Printing : The product name, product components, unit price, manufacturer, product design, etc. are printed on the surface of the base sheet by gravure printing, screen printing, offset printing, flexo printing, or the like. Printing is generally performed after the heat-sensitive adhesive layer is provided on the back surface of the base sheet, but after printing the base sheet,
A heat-sensitive adhesive layer may be formed on the back surface.

[0029]

【Example】

Hereinafter, the present invention will be described in more detail with reference to Examples. Manufacturing Example of Base Sheet Example 1 (1) Melt Flow Rate (MFR) 0.8 g / 10 min of polypropylene 81% by weight, high density polyethylene 3
The base layer composition (A), in which 16% by weight of calcium carbonate having an average particle diameter of 1.5 μm is mixed, is kneaded by an extruder set at 270 ° C., extruded into a sheet, and cooled by a cooling device. A non-stretched sheet was obtained. Then, this sheet was heated again to a temperature of 140 ° C. and then stretched 5 times in the machine direction.

(2) 81% by weight of polypropylene having an MFR of 4.0 g / 10 min, 3% by weight of high-density polyethylene and 16% by weight of calcium carbonate having an average particle diameter of 1.5 μm were mixed for the surface layer (B ) And 54% by weight of polypropylene having an MFR of 4 g / 10 min and 46% by weight of calcium carbonate having an average particle size of 1.5 μm are mixed and melt-kneaded in another extruder. After that, this was melt extruded into a sheet form from a die and laminated on both sides of the 5 times stretched film of (1) to obtain a laminated film having a three-layer structure. Then, after cooling the laminated film having the three-layer structure to 60 ° C., it is heated again to a temperature of about 160 ° C.,
It is stretched 7.5 times in the transverse direction using a tenter, annealed at a temperature of 165 ° C., cooled to a temperature of 60 ° C., and the ears are slit to form a three-layer structure (uniaxial stretching / biaxial stretching / Uniaxially stretched, thickness 80 μm (B / A / C = 16 μm
/ 48 μm / 16 μm) was obtained. The porosity of each layer is (B / A / C = 3% / 29.7% / 30%).
Met. The roughness of the surface layer (B) of this synthetic paper is shown in FIG.

Example 2 (1) 81% by weight of polypropylene having a MFR of 0.8 g / 10 min, 3% by weight of high-density polyethylene and an average particle size of 1.
The composition (A) containing 16% by weight of calcium carbonate of 5 μm was kneaded by an extruder set at 270 ° C., extruded into a sheet, and cooled by a cooling device to obtain an unstretched sheet. Then, this sheet was heated again to a temperature of 140 ° C. and then stretched 5 times in the machine direction.

(2) A composition (B) prepared by mixing 54% by weight of polypropylene having an MFR of 4.0 g / 10 min and 46% by weight of calcium carbonate having an average particle size of 1.5 μm was kneaded in another extruder. After that, this is extruded in a sheet form from a die and laminated on both sides of the 5 times stretched film of (1),
A laminated film having a three-layer structure was obtained. Next, after cooling the laminated film having the three-layer structure to 60 ° C.
Heated up to ℃, stretched 7.5 times in the transverse direction using a tenter, annealed at 165 ℃, cooled to 60 ℃, slit the ears, three layers Structure (uniaxially stretched / biaxially stretched / uniaxially stretched), wall thickness 80
A synthetic paper of μm (B / A / B = 16 μm / 48 μm / 16 μm) was obtained. The porosity of each layer is (B / A / B =
30% / 33.7% / 30%).

Example 3 (1) Composition (A) prepared by mixing 80% by weight of polypropylene having a melt flow rate of 0.8 g / 10 min with 6% by weight of high-density polyethylene and 14% by weight of calcium carbonate having a particle size of 1.0 μm. Was kneaded with an extruder set at 270 ° C., extruded into a sheet, and cooled by a cooling device,
An unstretched sheet was obtained. Then, this sheet was heated again to a temperature of 155 ° C., and then stretched 5 times in the machine direction.

(2) Melt flow rate is 4.0 g / 1
55% by weight of polypropylene in 0 minutes and particle size of 1.2 μm
The composition (B) in which 45% by weight of kaolin clay is mixed and kneaded by an extruder, and then extruded in a sheet form from a die, which is laminated on both sides of the 5 times stretched film of (1) to form a three-layer structure. I got a film. Then, after cooling the laminated film having the three-layer structure to 60 ° C., it is heated again to a temperature of about 180 ° C., stretched 7.5 times in the transverse direction using a tenter, and annealed at a temperature of 170 ° C. And then 60
Cooled to a temperature of ℃, slit the ears and have a three-layer structure (uniaxial stretching / biaxial stretching / uniaxial stretching), thickness 80 μm
(B / A / B = 20 μm / 40 μm / 20 μm) synthetic paper was obtained. The porosity of each layer is (B / A / B = 0 /
It was 3/0%).

Example 4 (1) Melt flow rate 4 g / 10 minutes, melting point 167 ° C.
55% by weight of polypropylene, 2 high density polyethylene
5% by weight of calcium carbonate having an average particle size of 1.5 μm 20
The composition (A) in which the weight% was mixed was melt-kneaded by an extruder set at a temperature of 270 ° C., and then coextruded into a sheet by a die, which was cooled by a cooling device to obtain an unstretched sheet. . Next, this unstretched sheet was heated to a temperature of 152 ° C. and then stretched 5 times in the machine direction to obtain a 5 times stretched sheet.

(2) Next, after heating again to a temperature of 160 ° C., it is stretched 7.5 times in the transverse direction using a tenter, annealed at a temperature of 167 ° C., and cooled to a temperature of 60 ° C. Then, the ears were slit to obtain a pearl-like synthetic paper (thickness 80 μm, porosity 33%).

Example 5 (1) 85% by weight of polypropylene (melting point 164 ° C.) having a melt flow rate of 0.8 g / 10 min, 5% by weight of high-density polyethylene and 10% by weight of calcium carbonate having an average particle size of 1.5 μm. The mixed composition (A) was kneaded by an extruder set at 270 ° C., then extruded into a sheet and cooled by a cooling device to obtain an unstretched sheet. Then, this sheet was heated again to a temperature of 155 ° C., and then stretched 5 times in the machine direction.

(2) Melt flow rate is 4.0 g / 1
52% by weight of polypropylene for 0 minutes, 5% by weight of high-density polyethylene, 1.5% by weight of maleic anhydride grafted polypropylene, calcium carbonate 4 having an average particle size of 1.5 μm
The composition (B) containing 0% by weight and 1.5% by weight of titanium oxide having a particle size of 0.8 μm was kneaded in an extruder and then extruded into a sheet form from a die. The double-stretched film was laminated on both sides to obtain a laminated film having a three-layer structure (B / A / B). Then, after cooling the laminated film having the three-layer structure to 60 ° C., it is heated again to a temperature of about 163 ° C., stretched 7.5 times in the transverse direction using a tenter, and annealed at a temperature of 167 ° C. Then, it is cooled to a temperature of 60 ° C., and the ears are slit to form a three-layer structure (uniaxially stretched / biaxially stretched / uniaxially stretched) having a wall thickness of 80 μm (B / A
/ C = 20 μm / 40 μm / 20 μm) was obtained. The porosity of each layer is (B / A / B = 5% / 16
% / 5%).

Example 6 A general-purpose polypropylene multi-layer synthetic paper "YUPO FPG95" (trade name) manufactured by Oji Yuka Synthetic Paper Co., Ltd. was used.

Example 7 (1) 81% by weight of polypropylene (melting point 164 ° C.) having a melt flow rate of 0.8 g / 10 min was mixed with 3% by weight of high-density polyethylene and 16% by weight of calcium carbonate having an average particle size of 1.5 μm. The composition (A) for a base layer was kneaded by an extruder set at 270 ° C., and then extruded into a sheet,
It cooled by the cooling device and the non-stretched sheet was obtained. Then, this sheet was heated again to a temperature of 140 ° C. and then stretched 5 times in the machine direction.

(2) Melt flow rate is 4.0 g / 1
54% by weight of polypropylene for 0 minutes and an average particle size of 1.5μ
The composition (B) mixed with 46% by weight of calcium carbonate of m was kneaded by another extruder, and then extruded into a sheet form from a die, which was then applied to one side of the 5 × stretched film of (1). By laminating, a laminated film having a two-layer structure was obtained. Next, with this composition (B), the melt flow rate was 4.0.
Polypropylene (C) for the surface layer of g / 10 min was melt-kneaded in another extruder and then laminated in two layers in the die to obtain the two-layered laminate of (2) above. Polypropylene (C) was laminated on the side of the composition (B) on which the sheet layer was not laminated, to obtain a laminated film having a four-layer structure. Then, the laminated film having the four-layer structure is cooled to 60 ° C., heated again to a temperature of about 160 ° C., stretched 7.5 times in the transverse direction using a tenter, and annealed at a temperature of 165 ° C. And then 60
Cool to ℃ and slit the ears (C / B / A
/ B = 5 μm / 16 μm / 48 μm / 11 μm), a synthetic paper having a four-layer structure was obtained. The porosity of each layer is (C / B / A /
B = 0% / 45% / 16% / 45%).

Example 8 A general-purpose high-density polyethylene-based synthetic paper “Polyart III” (trade name; single-layer biaxially stretched film) manufactured by BXL, UK was used.

Example 9 (1) Melt flow rate (MFR) is 0.8 g / 10
Min polypropylene (melting point about 164-167 ° C) 81% by weight, high-density polyethylene 3% by weight and average particle size 1.
The composition (A) containing 16% by weight of calcium carbonate of 5 μm was kneaded by an extruder set at 270 ° C., extruded into a sheet, and cooled by a cooling device to obtain an unstretched sheet. Then, this sheet was heated again to a temperature of 150 ° C. and then stretched 5 times in the machine direction.

(2) Another composition (B) was prepared by mixing 54% by weight of polypropylene (melting point: about 164-167 ° C.) having an MFR of 4 g / 10 min with 46% by weight of calcium carbonate having an average particle size of 1.5 μm. After kneading with an extruder, this was extruded into a sheet form from a die and laminated on both sides of the (1) 5-fold stretched film to obtain a laminated film having a three-layer structure.
Then, after cooling the laminated film having the three-layer structure to 60 ° C., it is heated again to a temperature of about 175 ° C., stretched 7.5 times in the transverse direction using a tenter, and annealed at a temperature of 165 ° C. Then, it is cooled to a temperature of 60 ° C. and the ears are slit to form a three-layer structure (uniaxially stretched / biaxially stretched / uniaxially stretched) having a wall thickness of 80 μm (B / A / B = 20 μm / 40).
μm / 20 μm) of synthetic paper was obtained. The porosity of each layer is (B / A / B = 4.6% / 13.9% / 4.6%).
Met. Table 1 shows the physical properties of these synthetic papers (microporous film).

[0045]

[Table 1]

Preparation Example of Heat Sensitive Adhesive 10 316 parts by weight of dicyclohexyl phthalate, 53 parts by weight of styrene / maleic anhydride / n-butyl acrylate copolymer solution with a concentration of 30% by weight, rosin abietic acid with a concentration of 50% by weight Ester emulsion 158 parts by weight, concentration 50
184 parts by weight of ethylene / vinyl acetate copolymer,
A white opaque aqueous heat-sensitive adhesive was prepared by mixing 160 parts by weight of colloidal silica having a concentration of 20% by weight and 120 parts by weight of water.

Example 11 40 parts by weight of dicyclohexyl phthalate, concentration 50% by weight
30 parts by weight of the abietic acid rosin ester emulsion, 22 parts by weight of an ethylene / vinyl acetate copolymer aqueous emulsion having a concentration of 50% by weight, and 15 parts by weight of polyvinyl alcohol having a concentration of 20% by weight are mixed to prepare an aqueous heat-sensitive adhesive. Prepared.

Example 1 The surface of the synthetic paper obtained in Example 1 was coated with the heat-sensitive adhesive obtained in Example 10 in an amount of 13 g / m ² in terms of solid content, and dried at 40 ° C. for 2 minutes. A heat-sensitive adhesive layer was provided. This was stored in a thermostatic chamber at 23 ° C. and 55% relative humidity for 2 days. Then, the product design, product name, manufacturer, component label, unit price, etc. are multi-color offset printed on the surface of the synthetic paper, and the width is 4
It was slit to 0 mm and rolled to obtain a delayed label roll.

These rolls were subjected to (i) a temperature-controlled room at 23 ° C. and 55% relative humidity and (ii) 40 ° C. and 7% relative humidity.
It was stored in a 5% thermostatic chamber for 7 days. Then, these rolls of delayed label are heated on an adherend (glass bottle, stainless can, high-density polyethylene hollow container) using a roll labeler LR-401KR (trade name) of Koyo Automatic Machine Co., Ltd. Labeling was performed under the conditions that the temperature of the mechanism was 120 ° C. and the pressure of the delayed label on the adherend was 1 kg. The adhesive strength to each adherend (after one day has passed) is shown in Table 2 below.

Further, the presence or absence of partial peeling of the label printed on the labeled adherend was evaluated according to the following four grades. 0--There is no peeling of the print. There are 1 to 3 small white spots per 1 to 40 cm ² , but there is no problem in practical use. There are 4-10 small white spots per 2-40 cm ² . 3--There is some peeling of the printed part, so it has no practical value.

Further, the ease of rewinding the delayed label during labeling (anti-blocking property) was evaluated according to the following five grades. 5 --- There is no peeling resistance. 4-Some sounds may be heard when peeling, but this is not a problem for practical use. 3 --- There is a continuous noise when peeling. 2--Peeling of the printed part due to blocking can be seen. 1--I cannot rewind the roll. The results are shown in Table 2.

[0052]

[Table 2]

Comparative Examples 1 to 6 and Examples 2 to 3 Delayed labels were produced and labeled in the same manner except that the synthetic papers of Example 1 were used instead of the synthetic papers of Example 1. I went. Table 3 shows the results of label printing and evaluation of anti-blocking property. In the case of using the high-density polyethylene-based synthetic paper of Example 8 as the substrate sheet, when the temperature of the heating mechanism was set to 120 ° C., the delayed label was thermally shrunk and could not be used practically. Temperature is 95 ℃
Was evaluated as.

[0054]

[Table 3]

Example 4 On the back surface of the synthetic paper obtained in Example 1,
The water-based heat-sensitive adhesive obtained in Example 11 had a solid content of 14 g / m 2.
^It was applied so as to be ^2, and dried at 100 ° C. Then, multi-color gravure printing was performed on the surface of the synthetic paper to obtain a delayed label, which was slit and wound into a roll. This was stored in a thermostatic chamber at 20 ° C. and 55% relative humidity for 1 day, then inserted into a labeling machine, and attached to a stainless steel can with a heating mechanism of 100 ° C. The anti-blocking property is good (evaluation 5),
There was no peeling of the print. The adhesive strength with a stainless steel can is
Initial 1,600gf / 40mm width, after 2 days 2,42
The width was 0 gf / 40 mm.

[0056]

EFFECTS OF THE INVENTION The delayed label of the present invention is a heat-sensitive adhesive label which has less blocking even at high temperature and high humidity and does not peel off when the roll-shaped label is unwound.

[Brief description of drawings]

FIG. 1 is a plan view of a label machine.

FIG. 2 is a plan view showing a part of an apparatus for measuring the surface strength of a sheet.

FIG. 3 is a diagram showing a surface roughness of a base sheet of a delayed label.

[Explanation of symbols] 1 roll label 2 Label feeding section 3 feed rollers 4 Crimping roller 5 optical sensor 6 Die-cut roller 7 anvil 8 labels 9 scrap 10 Transfer drum 11 Heating mechanism 12 Container transport mechanism 13 containers 14 Base sheet sample 15 Adhesive tape 15 'Same as above 15 ”Same as above 16 holder 17 angles 18 pendulum 19 needles 20 scale

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G09F 3/00-3/10

Claims (2)

(57) [Claims] 1. A delayed label having a base sheet with printing on the front side and a heat-sensitive adhesive layer on the back side, wherein the base sheet is a biaxially stretched film of a propylene-based resin film containing inorganic fine powder. Which is a uniaxially stretched propylene resin film containing 0 to 55% by weight of inorganic fine powder having an average particle diameter of 0.05 to 3 μm as a surface layer (B). A film, wherein the surface layer (B) to be printed is
The delayed label that satisfies the conditions of. Center surface average roughness measured by JIS B0601 (S
Ra) is 0.20 to 0.38 μm, center plane mountain height (SR)
p) is 3.0 to 8.5 μm, and the center plane valley depth (SRv) is 2.0 to 4.0 μm. The surface smoothness (Beck index) measured according to JIS P8119 is 400 to 1,200 seconds. The surface strength in the longitudinal direction is 1 to 10 kg · cm. 2. The delayed label according to claim 1, wherein the porosity of the base sheet is 5 to 30%.