JP2002307480A - Label for in-mold molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a label for in-mold molding which uses a foamed molding which is composed of a crystalline polypropylene resin composition and has minute voids as a base material, is highly opaque, has an appearance having a pearl tone gloss, and controls the generation of orange peel and bubbles on the surface of the molded label in an in-mold molding method in which the label is molded while being stuck on the inner surface of a mold. SOLUTION: The label for in-mold molding is formed from the foamed molding of the crystalline polypropylene resin composition. The expansion ratio of the foamed layer of the foamed molding which is calculated from formula: expansion ratio (%)=(A/B)×100 (A is the specific gravity of the crystalline polypropylene resin composition; B is the apparent specific gravity of the foamed layer of the foamed molding) is 105-124%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a label for in-mold molding, which has a pearl-like appearance and is formed by applying a label to an inner surface of a mold by injection molding or blow molding.

[0002]

2. Description of the Related Art Conventionally, transparent films obtained by biaxially stretching a polypropylene resin have been used for labels for frozen dessert containers and labels for bottles of detergents and the like. In recent years, labels have also been required to have a sense of quality, cleanliness, and appeal, and base materials having fine voids in base paper and exhibiting a pearl-like color have come to be used. However, when a substrate having fine voids is used for the label for in-mold molding, the voids inside the base paper cause skin or bubbles on the label surface of the molded product, and the appearance of the beautiful print is impaired. There was such a problem.

[0003]

DISCLOSURE OF THE INVENTION The present invention is based on a foamed molded article having fine voids composed of a crystalline polypropylene resin composition, and has a high opacity and an appearance having a pearly luster. An object of the present invention is to provide an in-mold molding method in which a label is stuck to the inner surface of a mold and molded so that the surface of the molded label is less likely to have a skin or bubbles.

[0004]

Means for Solving the Problems As a result of diligent studies, the present inventor has found that an in-mold molding label comprising a foamed molded article having a foaming layer having a specific foaming rate constituted of a crystalline polypropylene resin composition has been achieved. The inventors have found that the present invention can be solved, and have completed the present invention based on the findings.

The present invention has the following configuration. (1) An in-mold molding label composed of a foamed molded article composed of a crystalline polypropylene resin composition, wherein the foaming rate of the foamed layer of the foamed molded article is 105 to 124% as calculated by the following equation. A label for in-mold molding, characterized in that: Foaming rate (%) = (A / B) × 100 A: Specific gravity of crystalline polypropylene resin composition for foam layer of foam molded article B: Apparent specific gravity of foam layer of foam molded article

[0006] (2) The expanded layer of the expanded molded article is made of an unstretched film made of a crystalline polypropylene resin composition in which an inorganic filler powder and / or an organic resin component is blended with a crystalline polypropylene resin. The above (1), which is a void-containing stretched film stretched as described above.
The label for in-mold molding according to the above item.

(3) The foamed layer of the foamed molded article is composed of 2 to 5 parts by weight of calcium carbonate and 2 to 10 parts of titanium oxide of an inorganic filler powder based on 100 parts by weight of the crystalline polypropylene resin.
The above-mentioned (1), wherein the unstretched film comprising the crystalline polypropylene resin composition in which the parts by weight are blended is a hollow-containing single-layer stretched film obtained by stretching the film at an area magnification of 9 times or more. Label for in-mold molding.

(4) 0.5 to 4 parts by weight of a dicyclopentadiene-based petroleum resin having a softening point (ring and ball method) of 160 to 200 ° C. with respect to 100 parts by weight of a crystalline polypropylene resin, A void-containing unit obtained by stretching an unstretched film made of a crystalline polypropylene resin composition containing 2 to 5 parts by weight of calcium carbonate and 2 to 10 parts by weight of titanium oxide as an inorganic filler powder at an area magnification of 9 times or more. The label for in-mold molding according to the above (1), which is a layer stretched film.

(5) The foamed layer of the foamed molded article is composed of 2 to 5 parts by weight of calcium carbonate and 2 to 10 parts of titanium oxide of the inorganic filler powder based on 100 parts by weight of the crystalline polypropylene resin.
An unstretched film composed of a resin composition in which parts by weight were blended was used as a base layer, and a surface layer film composed of a crystalline polypropylene resin was laminated on at least one surface thereof.
The label for in-mold molding according to the above (1), which is a void-containing laminated stretched film obtained by stretching the film at least twice.

(6) 0.5 to 4 parts by weight of a dicyclopentadiene-based petroleum resin having a softening point (ring and ball method) of 160 to 200 ° C. with respect to 100 parts by weight of a crystalline polypropylene resin, An unstretched film made of a resin composition containing 2 to 5 parts by weight of calcium carbonate and 2 to 10 parts by weight of titanium oxide as an inorganic filler powder is used as a base layer, and a surface layer film made of a crystalline polypropylene resin is laminated on at least one surface thereof. The in-mold molding label according to the above (1), wherein the label is a laminated void-containing stretched film obtained by stretching the film to an area magnification of 9 times or more.

[0011]

Embodiments of the present invention will be described below. In the present invention, a film is a general term for a film and a sheet, and a cavity means a fine void.

In the label for in-mold molding of the present invention, the crystalline polypropylene resin used in the crystalline polypropylene resin composition constituting the foamed molded article as the base material is a crystalline homopolymer of propylene, propylene and ethylene or It is a binary or more copolymer with one or more kinds selected from α-olefins having 4 or more carbon atoms, or a mixture thereof. Specifically, the boiling n-heptane insoluble portion is 7
Crystalline polypropylene containing 0% by weight or more, preferably 80% by weight or more, crystalline ethylene-propylene copolymer containing 70% by weight or more of a propylene component, crystalline propylene-1-butene copolymer, crystalline propylene 1
-Hexene copolymer, crystalline ethylene-propylene-1
And propylene copolymers having a crystalline melting point such as butene copolymers.

[0013] The melt flow rate of the crystalline polypropylene resin (JIS K 7210 "Testing method for thermoplastic plastic flow" Table 14 conditions 14 (test temperature 230
C., measured by a test load of 21.18 N), hereinafter referred to as MFR) is 0.5 to 20 g / 10 min, preferably 0.5 to 20 g / 10 min.
Desirably, it is 10 to 10 g / 10 minutes.

In the label for in-mold molding of the present invention, the foamed layer of the foamed molded article as the base material has a foaming ratio calculated by the following equation of 105 to 124%. Foaming rate (%) = (A / B) × 100 A: Specific gravity of the crystalline polypropylene resin composition for the foamed layer of the foamed molded article B: Apparent specific gravity of the foamed layer of the foamed molded article When the foaming rate is less than 105% The opacity of the resulting in-mold label may be reduced, and the pearly appearance may be lost. If it exceeds 124%, yuzu or bubbles are generated on the surface of the in-mold label at the time of molding. However, the appearance of a beautiful print may be impaired.

In order to obtain a foamed molded article having a foamed layer having the above-mentioned foaming ratio, a conventionally known method can be used. However, an inorganic filler powder and / or
Alternatively, a method in which an unstretched film made of a crystalline polypropylene resin composition containing an organic resin component is stretched to an area magnification of 9 times or more is preferable. Stretching is performed to form cavities in the film. By stretching the film to an area magnification of 9 times or more, the obtained foamed molded article can have a paper-like appearance and a function similar to paper. The film-shaped foamed molded article obtained by this method has a uniform foaming rate, high productivity and excellent economic efficiency.

The inorganic filler powder to be added to the crystalline polypropylene resin composition for the foam layer of the foam molded article has an average particle diameter of 0.01 to 20 μm, preferably 0.0 to 20 μm.
1 to 10 μm, more preferably 0.1 to 5 μm, such as calcium carbonate, talc, titanium oxide, and silica, but calcium carbonate is advantageous in terms of cost,
Titanium oxide is excellent in terms of hiding properties. These may be used alone, but it is preferable to use two or more of them to easily obtain high opacity.

Examples of the organic resin component to be added to the crystalline polypropylene resin composition for the foam layer of the foam molded article include dicyclopentadiene-based petroleum resin, polybutylene terephthalate, polyethylene terephthalate acetal, polyamide and the like. However, since a fine and uniform cavity is easily obtained, the softening point (ring and ball method) is 160 to 20.
A dicyclopentadiene-based petroleum resin at 0 ° C. is preferably used.

The above softening point (ring and ball method) 160 to 200 ° C.
Examples of the dicyclopentadiene-based petroleum resin include one or more selected from cyclopentadiene, dicyclopentadiene, alkyl-substituted products and oligomers thereof, and mixtures thereof obtained from steam cracking of petroleum naphtha and the like (hereinafter, cyclopentadiene-based petroleum resin). Component)
Petroleum resin (H
R), a high-softening-point petroleum resin (HSHR) containing at least 50% by weight of a cyclopentadiene-based component and having a softening point (ring and ball method) in the range of 160 to 200 ° C;
And the above-mentioned petroleum resin (HR) containing a cyclopentadiene-based component in an amount of 50% by weight or more using a catalyst such as a metal such as vanadium, nickel or cobalt or an oxide thereof in the presence of a solvent, and 150-3
Softening point (ring and ball method) obtained by hydrogenating under conditions of 00 ° C. and hydrogen pressure of 1 to 15 MPa, 160 to 200 ° C., iodine value 2
0 or less hydrogenated dicyclopentadiene-based petroleum resin (HG
HR) or mixtures thereof.

In the label for in-mold molding of the present invention, the foamed layer of the foamed molded article as the base material is composed of 2 to 5 parts by weight of calcium carbonate as the inorganic filler powder based on 100 parts by weight of the crystalline polypropylene resin. And titanium oxide 2-1
When an unstretched film made of a crystalline polypropylene resin composition in which 0 parts by weight is blended is a cavity-containing single-layer stretched film obtained by stretching at a product magnification of 9 or more, the obtained label for in-mold molding is It has a high opacity and a pearly appearance. If the amount of the inorganic filler powder is less than the lower limit of the above range, the foaming ratio is less than 105%, the opacity of the obtained label for in-mold molding is reduced, and the pearl-like appearance may be lost. If the compounding amount of the agent powder exceeds the upper limit of the above range, the foaming rate exceeds 124%, and the surface of the label for in-mold molding may generate citrus or bubbles during molding, which may impair the appearance of a beautiful print. There is.

In the label for in-mold molding of the present invention, the foamed layer of the foamed molded article as a base material is composed of 2 to 5 parts by weight of an inorganic filler powder of calcium carbonate with respect to 100 parts by weight of a crystalline polypropylene resin. And titanium oxide 2-1
An unstretched film made of a crystalline polypropylene resin composition further containing 0.5 to 4 parts by weight of a dicyclopentadiene-based petroleum resin having a softening point (ring and ball method) of 160 to 200 ° C. When the cavity-containing single-layer stretched film obtained by stretching by a factor of 2 or more is obtained, the obtained label for in-mold molding has higher opacity, a pearl-like appearance, and excellent gloss.

When the label for in-mold molding of the present invention requires smoothness and further gloss, the unstretched film for the cavity-containing single-layer stretched film is used as a base layer, and smoothness and further gloss are required. After laminating a resin composition for a surface layer film composed of a crystalline polypropylene resin on one or both sides to be formed, a cavity-containing laminated stretched film obtained by stretching to an area magnification of 9 times or more is used as a foam molded article serving as a base material Is preferred. In addition, the crystalline polypropylene resin used for the resin composition for a surface layer film may be appropriately selected from one or more of the crystalline polypropylene resins. In this case, the crystalline polypropylene resin used for the base layer and the surface layer may be the same or different.

In the in-mold molding label of the present invention, the opacity (JIS P 8)
138 "measured by" Paper opacity test method ") is 80
% Is desirable. If the opacity is less than 80%, the concealing property is low, a pearl-like appearance cannot be obtained, and the color of the molded container may be transparent.

The crystalline polypropylene resin composition constituting the foamed layer and the surface layer film of the foamed molded article may contain various additives known to be added to the polypropylene, if necessary, such as phenolic, thioether or phosphorus-based additives. Processing stabilizers / antioxidants, higher fatty acid metal salts such as calcium stearate, lubricants such as fatty acid amides, pigments,
Polyethylenes, ethylene-propylene rubber, and the like can be added as a foaming agent and an additive polymer within a range that does not impair the object of the present invention.

The crystalline polypropylene resin composition constituting the foamed layer and the surface layer film of the foamed molded article is prepared by appropriately measuring the resin and additives according to the respective blending recipes, and stirring and mixing with an ordinary blender or mixer. be able to. Alternatively, pellets can be formed by melt-kneading using a general extruder.

In the present invention, as a method for obtaining an unstretched single-layer film from the crystalline polypropylene resin composition for the foamed layer of the foamed molded article, known methods such as T-die extrusion molding and inflation extrusion molding are used. Can be exemplified.
Further, as a method of obtaining an unstretched laminated film based on a crystalline polypropylene resin composition for a foamed layer of a foamed molded product, a coextrusion molding method in which a molten resin is formed into a multilayer in a die, extrusion molding is used. A known laminating method such as an extrusion laminating method of further laminating a surface layer film on the base layer film is used.

In order to obtain a stretched film from the unstretched film, the unstretched sheet is prepared, and then the unstretched sheet is stretched by biaxial stretching at a temperature of 140 to 230 ° C. simultaneously in the longitudinal and transverse directions to an area magnification of 9 times or more. Heat-treated at the same temperature while relaxing by 5 to 20% so that the foaming ratio of the foamed molded article layer is 105 to 12
A 4% voided stretched film is obtained. As the stretching method, a stretching method such as a sequential tenter device or a simultaneous tenter device can be employed.

In the present invention, the thickness of the foamed molded product is not particularly limited, but is 25 to 200 μm, preferably 40 to 18 μm.
0 μm, more preferably 60 to 150 μm. Further, when the foamed molded product is a void-containing laminated stretched film, the thickness of the base layer film is 5 times the thickness of the entire laminated film.
It is preferably 0% or more.

In the label for in-mold molding according to the present invention, a secondary material such as printing, cutting, die-cutting or the like usually performed in the production of the label for in-mold molding is applied to the foam molded body as the base material according to the purpose of use. After being processed and decorated, it is subjected to an injection molding method or a blow molding method as an in-mold molding label.

[0029]

EXAMPLES The present invention will be described below in detail with reference to Examples and Comparative Examples, but the present invention should not be limited by these.

The evaluation methods used in the following Examples and Comparative Examples are as follows. (1) Suitability for in-mold molding Visually check the state of the label after in-mold molding, and
The state of generation of yuzu skin was observed. ：: Almost no air bubbles and citrus were generated. ：: There is a little generation of bubbles and citron, but there is no practical problem. ×: Significant damage to label printing / decoration may occur due to generation of air bubbles and yuzu skin.

(2) Opacity of foamed molded article TECHNI BRITE MICRO TB-1 according to JIS P 8138 “Test method for opacity of paper”
(Manufactured by TECHNIDYNE) and determined according to the following criteria. ：: 80% or more ×: less than 80%

(3) Appearance of foam molded article The appearance of the foam molded article was visually observed. 〇: It has a pearl-like appearance. ×: The appearance of the plastic film remains as it is.

(4) Foaming rate of foam layer (%) Foaming rate (%) = (A / B) × 100 A: Specific gravity of crystalline polypropylene resin composition for foam layer of foam molded article B: Foam molded article Apparent specific gravity of foam layer A: The crystalline polypropylene resin composition for the foam layer of the foam molded article was measured with an automatic hydrometer (manufactured by Toyo Seiki Seisaku-sho, Ltd.), and the average value of n = 3 was calculated. B: (When the foamed molded product is a single-layer film): Four film samples were cut out using a mold of 0.05 m ² and weighed, and four samples were measured with a dial gauge (manufactured by Ozaki Seisakusho). The average thickness was measured at 5 points each, for a total of 20 points, and divided to calculate the apparent specific gravity. B: (The foamed molded product is a laminated film (surface layer / base layer / surface layer)
Case): The surface film of the cavity-containing laminated stretched film was peeled off, and the apparent specific gravity and the average thickness of the surface film were calculated by the above-described measurement methods. The apparent specific gravity and the average thickness of the cavity-containing laminated stretched film were also calculated by the above-mentioned measuring methods. The apparent specific gravity of the foam layer, which is the base layer of the void-containing laminated stretched film, was calculated from the following equation. B = {(C × D) − (E × F × 2)} / (D−F × 2) B: Apparent specific gravity of foam layer C: Apparent specific gravity of void-containing laminated stretched film D: Void of void-containing laminated stretched film Thickness (μm) E: Apparent specific gravity of surface film F: Thickness of surface film (μm)

Example 1 [Preparation of composition for foamed molded product (hollow-containing single-layer stretched film)] 100 parts by weight of crystalline polypropylene powder containing 96% by weight of an n-heptane-insoluble part and having an MFR of 2 g / 10 minutes. 0.2 parts by weight of phenolic antioxidant BHT (trade name), 0.1 part by weight of calcium stearate,
2 parts by weight of a dicyclopentadiene-based petroleum resin (hereinafter referred to as DCPD) having a softening point of 172 ° C., 2 parts by weight of calcium carbonate (average particle size 1.5 μm), and 7 parts by weight of titanium oxide (average particle size 0.8 μm) After being charged into a Henschel mixer (trade name) and mixed and stirred, the mixture is supplied to a co-rotating twin-screw extruder, melted and kneaded at 240 ° C., extruded as strands, and cooled and cut to form a pellet-shaped foam molded product (hollow). Containing single-layer stretched film).

[Foam Molded Article (Single Layer Stretched Film Containing Cavity)
Preparation of film extruder equipped with T die (extruder is
Using a 65 mmφ single-screw extruder) and a biaxial stretching machine with a tenter method, the crystalline polypropylene resin composition for the foamed molded article (cavity-containing single-layer stretched film) was supplied to the extruder, and the T-die temperature was 240 ° C. And extruded, and quenched by a mirror cooling roll having a surface temperature of 30 ° C. to obtain an unstretched film. The obtained unstretched film is guided to a longitudinal stretching machine, stretched 5 times at a temperature of 140 ° C. between heating rolls, and then stretched 8 times in a transverse direction at a temperature of 160 to 210 ° C. in a tenter, and then wound up. Was 80 μm to obtain a foamed molded product (hollow-containing single-layer stretched film).

[Injection molding method] A rectangular label sample having a side length of 80 mm was cut out from the obtained foamed molded product (hollow-containing single-layer stretched film), and static electricity was induced in the label sample by a charging device. After fixing the label sample on the inner surface of the injection mold, the MFR is 40 g / 1.
0 minute polypropylene resin "Chisso Polypro K114
0 "for molding temperature 200-220 ° C and injection pressure 12MP
a) The mold was cooled at a mold temperature of 40 ° C. for 2 minutes to obtain a molded sheet, and the workability was evaluated. The molding sheet is 150mm
Square, wall thickness 1 mm.

[Blow Molding Method] A label sample having a length of 50 mm and a width of 70 mm is cut out from the obtained foamed molded article (cavity-containing single-layer stretched film), and static electricity is induced on the label sample by a charging device to fix the sample to a mold. After that, 22 parts of high-density polyethylene “Chissopolyethylene B5504” was added.
After the parison was extruded at 0 ° C., and then the parison was sandwiched between molds, air at a pressure of 0.5 MPa was supplied into the parison, and the molded body was cooled by the mold, and the mold was opened. And a 200 mm high hollow container (1 mm thick) was evaluated for workability. Table 1 shows the composition and specific gravity of the crystalline polypropylene resin composition for the foamed molded article (hollow-containing single-layer stretched film), the properties of the foamed molded article, and the evaluation results of the label.

Example 2 [Preparation of composition for surface layer stretched film] MFR was 1.5 g /
10 minutes, ethylene concentration 8% by weight and block index of 0.
8% propylene-ethylene block copolymer powder 10
0 parts by weight, 0.2 parts by weight of phenolic antioxidant BHT (trade name), 0.1% by weight of calcium stearate
The weight part is put into a Henschel mixer (trade name) and stirred, then supplied to a co-rotating twin-screw extruder, melt-kneaded at 240 ° C., extruded as a strand, cooled, cut, and pelletized to form a surface layer. A polypropylene resin composition for a film was obtained.

[Preparation of foamed molded product (hollow-containing laminated stretched film)] A three-type three-layer film extruder equipped with a multi-layer T die (the extruder is a single-screw extruder for a base layer of 65 mmφ in diameter.
The composition for the foamed molded product described in Example 1 was intermediately used as the polypropylene resin composition for the base layer (foamed layer) using a table and two monoaxial extruders for the surface layer having a diameter of 50 mmφ and a biaxial stretching machine with a tenter method. The above-mentioned resin composition for a surface layer is supplied to a single-screw extruder for a layer, and the T-die temperature is set to 2
The mixture was melted at 40 ° C., co-extruded, quenched with a mirror-surface cooling roll having a surface temperature of 30 ° C., and cooled to a surface layer / base layer / surface layer in the order of 1: 3: 1. A stretched film was obtained. The obtained unstretched film is guided to a longitudinal stretching machine, stretched 5 times at a temperature of 140 ° C. between heating rolls, and then stretched 8 times in a transverse direction at a temperature of 160 to 210 ° C. in a tenter. A foam molded article (hollow-containing laminated stretched film) having a thickness of 11 μm, a foam layer thickness of 58 μm, and a total thickness of 80 μm was obtained. The obtained foam molded article was evaluated in the same manner as described in Example 1. Table 1 shows the formulation and specific gravity of the crystalline polypropylene resin composition for the base layer (foam layer) of the foam molded article, the properties of the foam molded article, and the evaluation results of the label.

Example 3 The procedure of Example 1 was repeated except that the amounts of DCPD, calcium carbonate and titanium dioxide to be added to the composition for the foamed molded article (hollow-containing single-layer stretched film) were changed as shown in Table 1. According to the method of foam molded article (hollow containing single layer stretched film)
And subjected to an evaluation test. Table 1 shows the composition and specific gravity of the crystalline polypropylene resin composition for the foamed molded article (hollow-containing single-layer stretched film), the properties of the foamed molded article, and the evaluation results of the label.

Comparative Examples 1, 2, and 3 The same procedure was carried out except that the amounts of DCPD, calcium carbonate and titanium dioxide to be added to the composition for the foamed molded product (hollow-containing single-layer stretched film) were changed as shown in Table 1. According to the method described in Example 1, a foamed molded product (hollow-containing single-layer stretched film)
And subjected to an evaluation test. Table 1 shows the composition and specific gravity of the crystalline polypropylene resin composition for the foamed molded article (hollow-containing single-layer stretched film), the properties of the foamed molded article, and the evaluation results of the label.

[0042]

[Table 1]

[0043]

The label for in-mold molding of the present invention has a pearl-like appearance, has high opacity, and hardly generates citrus skin, and thus can be suitably used as a label for in-mold molding.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C08J 9/00 CES C08J 9/00 CESA G09F 3/04 G09F 3/04 Z // B29K 105: 20 B29K 105: 20 623 : 00 623: 00 C08L 23:10 C08L 23:10 (72) Inventor Soichiro Hiraki 5-1, Goi Kaigan, Ichihara City, Chiba Prefecture AB04 AB05 AC17 AC26 CA02 CA03 CA04 CE02 DA45 DA52 DA59 4F100 AA08A AA21A AK07A AK07B AK07C BA03 BA06 BA10B BA10C CA23A DC11 EJ372 HB00 JA11A JA11B JA11C JN02 4F206 AD05 AD09 AD17 AD20 AD03 AD07 AD07 AD07 AD07 AD07 AD07

Claims (6)

[Claims] 1. A label for in-mold molding comprising a foamed molded article composed of a crystalline polypropylene resin composition, wherein the foaming rate of the foamed layer of the foamed molded article is calculated from the following formula: 105 to 124. % For in-mold molding. Foaming rate (%) = (A / B) × 100 A: Specific gravity of crystalline polypropylene resin composition for foam layer of foam molded article B: Apparent specific gravity of foam layer of foam molded article 2. An unstretched film made of a crystalline polypropylene resin composition in which an inorganic filler powder and / or an organic resin component is blended with a crystalline polypropylene resin, wherein the foamed layer of the foamed molded article has an area magnification of 9 times or more. 2. The label for in-mold molding according to claim 1, wherein the label is a stretched film containing cavities. 3. A crystalline foam wherein the foamed layer of the foamed molded article is obtained by mixing 2 to 5 parts by weight of calcium carbonate and 2 to 10 parts by weight of titanium oxide as an inorganic filler powder with respect to 100 parts by weight of a crystalline polypropylene resin. The label for in-mold molding according to claim 1, wherein the label is a single-layer void-containing film obtained by stretching an unstretched film made of a polypropylene resin composition to an area magnification of 9 times or more. 4. The foamed layer of the foamed molded article has a softening point (ring and ball method) of 16 with respect to 100 parts by weight of a crystalline polypropylene resin.
Dicyclopentadiene-based petroleum resin at 0 to 200 ° C 0.5
４4 parts by weight, 2 to 5 parts by weight of inorganic filler powder calcium carbonate and 2 to 10 parts by weight of titanium oxide An unstretched film composed of a crystalline polypropylene resin composition is blended and stretched to an area magnification of 9 times or more. 2. The label for in-mold molding according to claim 1, which is the obtained hollow-containing single-layer stretched film. 5. A resin composition wherein the foamed layer of the foamed molded article is composed of 2 to 5 parts by weight of calcium carbonate and 2 to 10 parts by weight of titanium oxide as an inorganic filler powder with respect to 100 parts by weight of a crystalline polypropylene resin. An unstretched film made of a product is used as a base layer, and after laminating a surface layer film made of a crystalline polypropylene resin on at least one surface thereof, it is characterized by being a void-containing laminated stretched film obtained by stretching to an area magnification of 9 times or more. The label for in-mold molding according to claim 1. 6. The foamed layer of the foamed molded article has a softening point (ring and ball method) of 16 based on 100 parts by weight of the crystalline polypropylene resin.
Dicyclopentadiene-based petroleum resin at 0 to 200 ° C 0.5
４4 parts by weight, 2 to 5 parts by weight of inorganic filler powder calcium carbonate and 2 to 10 parts by weight of titanium oxide as a base layer of an unstretched film composed of a resin composition, at least one surface of which is made of a crystalline polypropylene resin The label for in-mold molding according to claim 1, wherein the label is a cavity-containing laminated stretched film obtained by laminating a surface layer film and stretching the film to an area magnification of 9 times or more.