JPH11167349A - Heat sensitive label - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent a heat-sensitive adhesive layer of a label from blocking an overcoat varnish layer on the surface of a label base sheet under environmental conditions at a temperature exceeding room temperature. Make sure that the combined labels do not stick together and cause damage to the labels or trouble in label supply on the labeling machine. The substrate sheet includes at least a base sheet, a pattern ink layer provided on a surface of the base sheet, and the base sheet.
Of an overprint varnish layer 3 having a blocking resistance by a urethane-based two-component curable resin applied to the surface of the pattern ink layer 2 from above and a heat-sensitive adhesive layer 4 applied to the back surface of the base sheet 1 Equipped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive adhesive label used by sticking to a container such as a glass bottle or a plastic bottle.

[0002]

2. Description of the Related Art In a conventional heat-sensitive adhesive label, as shown in FIG. 2, a pattern ink layer 12 is applied to the surface of a paper or plastic base sheet 11 by printing.
On the surface of the substrate sheet 11, a transparent overcoat varnish layer 13 is formed by coating a transparent overcoat varnish for obtaining a surface gloss from the pattern ink layer 12 and protecting the surface. Is provided with a heat-sensitive adhesive layer 14 made of a hot-melt resin.

The above-mentioned heat-sensitive adhesive label is used by melting the heat-sensitive adhesive layer 14 by heating and applying the label to a predetermined surface of a container such as a glass bottle or a plastic bottle, or another article by pressing the label. Is done.

The heat-sensitive adhesive layer 14 of the heat-sensitive adhesive label has a thermoplastic resin such as an ethylene-vinyl acetate copolymer (EVA resin), an elastomer resin such as rubber, or an acrylic resin. A resin is used, and a solvent that is relatively hard to volatilize, such as a polyhydric alcohol or a polyol, is added as a tackifier in order to impart tackiness (tackiness) as a label.

[0005] Therefore, when a plurality of the heat-sensitive adhesive labels as described above are stored one after another or left unattended, the above-mentioned adhesive layer 14 may not be formed at a temperature higher than room temperature, for example, at 35 ° C to 40 ° C. However, the overcoat varnish layer 13 on the surface of the base sheet 11 was liable to cause blocking, and the labels stacked one on top of the other were difficult to separate due to sticking to each other, and the labels were easily damaged.

In particular, as the overcoat varnish layer 13 used on the surface of the base sheet 11, a nitrocellulose-based overcoat varnish (OP varnish, component; nitrocellulose, maleic acid, etc. , Solvents, etc.) tended to further promote blocking.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the heat-sensitive adhesive layer of the label from blocking the overcoat varnish layer on the surface of the label base sheet under environmental conditions at a temperature exceeding room temperature. It is an object of the present invention to prevent labels from being superimposed on each other and causing damage to the labels or trouble in label supply on a label sticking machine.

[0008]

Means for Solving the Problems A first invention of the present invention is:
At least a base sheet 1, a pattern ink layer 2 applied to the surface of the base sheet 1, and a urethane-based two-pack curable resin applied to the surface of the base sheet 1 from above the pattern ink layer 2. A heat-sensitive adhesive label comprising: an overprint varnish layer 3 having blocking resistance; and a heat-sensitive adhesive layer 4 provided on the back surface of the base sheet 1.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the heat-sensitive adhesive label of the present invention will be described below in detail with reference to the side sectional view shown in FIG.

FIG. 1 shows a pattern ink layer 2 applied to the surface of a base sheet 1 by printing. The surface of the base sheet 1 is overprinted with a urethane-based two-pack curable resin from above the pattern ink layer 2. A varnish layer 3 is applied over the entire surface to impart surface gloss and protect the surface. On the back surface of the base sheet 1, an ethylene-vinyl acetate copolymer (EV
(A resin), a thermoplastic resin such as an elastomer resin such as rubber, or an acrylic resin.

The base sheet 1 is a paper sheet or a plastic sheet made of vinyl chloride, polyethylene terephthalate, polyethylene, acrylic or the like.

The overprint varnish layer 3 entirely applied to the surface of the base sheet 1 from the pattern ink layer 2 is coated with an overprint varnish (OP varnish) made of a urethane-based two-component curable resin to prevent blocking. It is formed by application, and is solidified and dried quickly by a curing reaction after application.

Since the overprint varnish layer 3 is a solidified film formed by a cross-linking and curing reaction, it has heat resistance, and after the cross-linking and curing, it has chemical resistance, stain resistance, and abrasion resistance in the same manner as a baked dry paint. In addition, the coating of the overprint varnish layer 3 does not cause blocking even at a temperature higher than ordinary temperature, for example, at an environmental condition of about 40 ° C.

As the overprint varnish of the overprint varnish layer 3, a polyol-curable or catalyst-curable urethane-based two-pack curable resin can be used. In the present invention, a polyol-curable resin is suitable.

The polyol-curable urethane-based two-component curable resins include compounds having OH groups such as polyester polyols, polyether polyols and acrylic polyols (main solution) and isocyanates having NCO groups (crosslinking agent solutions). The one which is cured by urethane bonding by the two-part reaction of, for example, is used by mixing the two parts by setting the OH group and the NCO group to be equimolar.

When the isocyanate used is a monomer type, it is preferable to use a non-yellowing type isocyanate.

The urethane-based two-component curable resin to be used can be appropriately selected depending on the material of the base sheet 1. Preferably, the two-component curable resin of acrylic polyol and isocyanate is more suitable in terms of the antiblocking effect. is there.

In addition, a two-part curable resin of polyvinyl alcohol and isocyanate can be used as an aqueous urethane two-part curable resin.

[0019]

EXAMPLES Specific examples of the heat-sensitive adhesive label of the present invention will be described below.

<Example 1> A printing machine (gravure printing machine, offset printing machine, screen printing machine, etc.) is applied to a coated surface of a piece of art paper (84.9 g / m ² ) as the base sheet 1.
A pattern for a label was printed by using, and a pattern ink layer 2 (nitrocellulose-based printing ink; UPPS; manufactured by Toyo Ink Mfg. Co., Ltd.) was provided.

Subsequently, an OP made of a urethane two-part curable resin is applied to the entire surface of the coated side of the single art paper (84.9 g / m ² ) with a gravure coater (or a roll coater) from the pattern ink layer 2. Varnish (PB484, Urps
Varnish; Toyo Ink Manufacturing Co., Ltd.)
g / m ² was applied to form an overcoat varnish layer 3 having blocking resistance.

Thereafter, a heat-sensitive adhesive (EVA-based heat-sensitive adhesive, AW1040; manufactured by Toyo Ink Mfg. Co., Ltd.) was applied on the reverse side of the coated side of the single art paper at an application amount of 5 to 20 g / m ² to obtain a heat-sensitive adhesive. The label of the present invention was manufactured by forming the adhesive layer 4.

<Example 2> The label of the present invention was prepared in the same manner as in Example 1 except that the picture ink layer 2 and the overcoat varnish layer 3 were printed and applied in the same gravure printing machine as a continuous process. Manufactured.

<Comparative Example> The above Example 1 or Example 2 was repeated except that a nitrocellulose OP varnish was used as the overcoat varnish in Example 1 or Example 2.
A label was produced in the same manner as described above to obtain a label of a comparative example.

<Comparative Results> The labels manufactured in Example 1, Example 2 and Comparative Example were stacked 50 by 50, a load of 1 kg / cm ² was applied on the stacked labels, and a temperature of 40 ° C. and a humidity of 80 were applied. The labels were allowed to stand for 24 hours under the environment condition of% RH, and the occurrence of blocking between the heat-sensitive adhesive layer and the overcoat layer of each of the stacked labels was observed. The results are shown below.

Existence of label blocking occurrence Example 1 None Example 2 None Comparative example Yes

[0027]

The heat-sensitive adhesive label of the present invention is provided with an overcoat layer having blocking resistance on the surface of the label. Blocking between the heat-sensitive adhesive layer and the heat-sensitive adhesive layer can be prevented.When stacking and storing a plurality of sheet-shaped labels or leaving them unattended, conventionally, it was necessary to store them in a cool and dark place. However, according to the present invention, even under an environmental condition of a normal temperature or higher of about 40 ° C., it is possible to avoid the occurrence of blocking between overlapping with the heat-sensitive adhesive layer on the back surface of the label, Since there is no need to worry, when the label is wound up in a roll shape (web shape) in the label manufacturing process, there is an excellent effect such that the label can be wound up harder than before.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a laminated film for corrosion-resistant soft packaging of the first invention.

FIG. 2 is a side sectional view of a corrosion-resistant soft package according to the second invention.

[Explanation of symbols]

A: Laminated film for corrosion-resistant soft packaging B: Corrosion-resistant soft packaging C: Contents D: Metal corrosive substance 1: Base film 2: Gas barrier metal thin film layer 3:
Heat seal layer 4 ... Corrosion resistant thin film layer 5, 6 ... Adhesive layer 7 ... Printing ink layer 8 ... Film edge

Claims (1)

[Claims] The present invention relates to at least a base sheet, a picture ink layer provided on a surface of the base sheet, and a base sheet.
Of an overprint varnish layer 3 having a blocking resistance by a urethane-based two-part curable resin applied on the surface of the pattern ink layer 2 from the upper side of the pattern ink layer 2 and a heat-sensitive adhesive layer 4 applied to the back surface of the base sheet 1 A heat-sensitive adhesive label, comprising: