JP2002128914A - Decorative film for steel sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative film for a steel sheet, made from a base resin comprising a polyolefin resin. SOLUTION: The decorative film is made from a resin composition consisting of (A) 100 pts.wt. base resin comprising 10-40 wt.% polypropylene resin (a) having prescribed flow characteristics, 25-75 wt.% thermoplastic olefin elastomer (b) comprising a block or graft copolymer having an ethylene/propylene copolymer component and a polypropylene component, with a melt flow rate of 0.1-3 g/10 min, and 15-35 wt.% thermoplastic olefin elastomer (c) comprising a block or graft copolymer having an ethylene/propylene copolymer component and a polypropylene component, with a melt flow rate of 7-30 g/10 min, and (B) 5-30 pts.wt. of at least one filler selected from calcium carbonate and talc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative film for a steel sheet, and more particularly, to a polyolefin resin for applying a decorative effect on a steel sheet surface which has been subjected to various surface treatments as required. About the film.

[0002]

2. Description of the Related Art A decorative steel sheet, which is obtained by bonding a decorative film to the surface of a steel sheet which has been subjected to various surface treatments as required, is used for cabinets for electronic and electric products, interior and exterior materials for houses,
It is used in a wide range of fields such as housing equipment components and vehicle components.

Conventionally, as such a decorative film for a steel sheet, the hardness of the film can be freely adjusted by adding an appropriate amount of a plasticizer, and the drawing of the steel sheet after lamination to the steel sheet is performed. Problems such as whitening and cracking are unlikely to occur during processing and bending, and furthermore, in drilling steel plates, vinyl chloride resin films are widely used because whitening and stringing are not observed in the cross section.

[0004] However, in recent years, since vinyl chloride resin contains chlorine, decorative films for steel sheets have also been changed from vinyl chloride resin to polyolefin resins such as polyethylene resin and polypropylene resin due to increasing environmental problems. Alternatives are advancing.

However, conventionally, a film made of a polyolefin resin is formed by extruding a molten resin from a T-die to obtain a smooth film, or by pressing a molten resin from a ring-shaped circular die into a tube. It is manufactured by an inflation method in which compressed air is blown into the tube at the same time as it is taken out and the tube is expanded to obtain a tubular film. However, the productivity is low according to the T-die method, while the film is wavy according to the inflation method, and is not originally suitable for use as a film to be subjected to lamination processing, such as a decorative film for a steel sheet. .

Therefore, in the production of a film made of a polyolefin resin, calendering is required as in the production of a conventional ordinary vinyl chloride resin film. However, when a polyethylene or polypropylene resin is used as a raw material in the calendering process, if these resins are melted, the viscosity is low and the tackiness is remarkable. This makes it difficult to produce a film with a smooth surface with good thickness accuracy, and in some cases even a continuous film. Further, even if the resin is semi-molten, a film having a smooth surface cannot be obtained.

Furthermore, a film made of a general-purpose polyolefin resin such as a polyethylene resin or a polypropylene resin does not have sufficient heat resistance during lamination to a steel sheet, and furthermore, drawing and bending of the steel sheet after lamination of the steel sheet. In such a case, inconveniences such as whitening and cracks are likely to occur, and whitening and stringing are liable to occur in the cross-section of the hole even in drilling.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems in a decorative film for a steel sheet, and is intended to be manufactured by calendering while using a polyolefin resin as a base resin. It is excellent in heat resistance during lamination to steel plate, and does not cause defects such as whitening and cracking when drawing or bending steel plate after lamination to steel plate. An object of the present invention is to provide a decorative film for a steel sheet in which whitening or stringing does not occur even in the processing.

[0009]

According to the present invention, there is provided a decorative film for a steel sheet comprising a resin composition comprising 100 parts by weight of a base resin and 5 to 30 parts by weight of a filler, wherein (A) the base resin is (a) Using a twin capillary rheometer at a shear rate of 10,000 at 170 ° C. and 180 ° C.
(1 / sec), the elongational viscosity is 2235 to 5816
In the range of Pa · s, and a shear rate of 1 at a temperature of 170 ° C. and 180 ° C. using a twin capillary rheometer.
Die swell ratio of 1.1 (1 / second) is 1.1
Polypropylene resin having a melt tension of 1 gf or more at a take-up speed of 5 m / min at a temperature of 180 ° C. with a capillary rheometer.
An olefin heat comprising a block or graft copolymer having 40% by weight and (b) an ethylene-propylene copolymer component and a polypropylene component and having a melt flow rate in the range of 0.1 to 3 g / 10 minutes. 25 to 75% by weight of a plastic elastomer, (c) an ethylene-propylene copolymer component and a polypropylene component, and 7 to 30 g / 1
An olefin-based thermoplastic elastomer comprising a block or graft copolymer having a melt flow rate in the range of 0 minute in an amount of 15 to 35% by weight, and (B) the filler is at least one selected from calcium carbonate and talc. A decorative film for a steel sheet is provided.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A decorative film for a steel sheet according to the present invention comprises (A) 100 parts by weight of a base resin and (B) fillers 5 to 3.
0 parts by weight.

According to the present invention, the main resins in the base resin (A) are two kinds of olefinic thermoplastic elastomers (b) and (c) having predetermined flow characteristics, which have predetermined flow characteristics. Is blended with a polypropylene resin (a) having the formula (1) to form a base resin (A), and a filler (B) is further blended into the resin to form a resin composition. According to the present invention, the blend of the two olefinic thermoplastic elastomers has a calendaring property by itself, and the polypropylene resin also has a calendaring property by itself. I have.

Thus, according to the present invention, such a resin composition resin comprising a base resin and a filler has excellent calendering properties, and gives a film stably by calendering. The film thus obtained has all the properties required for the above-mentioned decorative film for steel plates.

The polypropylene resin used in the present invention
(a) shows, as a flow characteristic, an elongational viscosity of 2235 at a shear rate of 10,000 (1 / second) at a temperature of 170 ° C. and 180 ° C. using a twin capillary rheometer.
The die swell ratio is 1.1 to 2.5 when the shear rate is 10,000 (1 / sec) at a temperature of 170 ° C. and 180 ° C. using a twin capillary rheometer with a twin capillary rheometer. The melt tension at a take-up speed of 5 m / min at a temperature of 180 ° C. by a capillary rheometer must be 1 gf or more.

In the present invention, the elongational viscosity and the die swell ratio of such a resin are preferably measured using a twin capillary rheometer (for example, model RH7-2) manufactured by Rosand Precision Ltd. Can be measured. Both the elongational viscosity and the die swell ratio are indicators of the ease with which the molten resin composition can be deformed under the free surface after exiting, for example, a film forming die. Is the viscosity at a constant strain rate and at a constant temperature. On the other hand, the die swell ratio is the ratio between the diameter of the extrudate and the diameter of the nozzle when the molten resin composition is extruded from the die.

FIG. 1 shows a twin capillary rheometer.
As shown in FIG. 1, a pair of barrels 1 is provided, and one barrel has a long die 2 of an appropriate length attached thereto, and the other barrel has a short die 3 having almost no length attached thereto. The resin composition to be measured is charged into both barrels, heated to a predetermined temperature and melted, each piston 4 is simultaneously operated, and the melt in each barrel is detected by the pressure sensor 5 attached to the die inlet. The difference in pressure loss based on the difference in the length of the die of the resin composition is determined, and the desired elongational viscosity can be determined from this and the shear rate obtained from the speed of the piston.

That is, a pressure loss P ₀ (MPa) generated in a virtual zero-length die (ie, orifice) is obtained from the following equation.

[0017]

(Equation 1)

Here, P _L is the pressure loss (MPa) measured with a long die, P _S is the pressure loss (MPa) measured with a short die, L _L is the length (mm) of the long die, L _S
Is the length (mm) of the short die.

The shear viscosity was measured by a twin capillary rheometer.

[0020]

(Equation 2)

The shear rate η and the shear stress τ can be determined, and based on these, the extensional viscosity λ can be determined from the following equation.

[0022]

(Equation 3)

Where n is a power law in power law
dex) where k is a constant and

[0024]

(Equation 4)

Is a value determined by

In the present invention, the melt tension is
A capillary rheometer with a single barrel manufactured by Toyo Seiki Seisaku-sho, Ltd.
(Type C). As shown in FIG. 2, the melted resin composition is extruded from a capillary rheometer 21 at a constant speed onto a strand 22, and the strand is measured by a tension detector 23.
Take-up roll 25 through tension detecting pulley 24 attached to
While winding at a predetermined speed, the tension applied to the strand at this time is measured by the tension detector 23.

According to the present invention, in order to obtain a film having a smooth surface from a resin composition containing such a polypropylene resin, preferably by calendering, the die swell ratio of the polypropylene resin measured under the above conditions Is in the range of 1.1 to 2.5, and the elongational viscosity of the polypropylene resin measured under the above conditions is small,
It is necessary to be in the range of 5816 Pa · s.

In the calendering of the resin composition, the polypropylene resin is heated at a temperature of 18 ° C. from a capillary rheometer so that the film rolled by the calender roll can be taken off from the final roll without any trouble.
Extruded as a strand at 0 ° C.
When winding with a take-up roll at m / min, the melt tension is 1 gf
It is necessary to be above. In practice, take-off speed 5
When winding with a take-up roll at m / min or more, the melt tension is 1
gf or more is sufficient.

According to the present invention, the polypropylene resin
The resulting film is given an appropriate hardness as a decorative film for a steel sheet, particularly a desired surface hardness, and enhances scratch resistance (scratch resistance). Therefore, the proportion of such a polypropylene resin in the base resin is in the range of 10 to 40% by weight. When the proportion of the polypropylene resin in the base resin is less than 10% by weight, the obtained film is
It does not have the required surface hardness as a decorative film for a steel sheet, and the resulting film is whitened upon bending. However, when the proportion of the polypropylene resin in the base resin is more than 40% by weight, the obtained film is insufficient in flexibility, and the obtained film has too high bending rigidity, so that when laminating to a steel sheet, Difficult to handle,
Easy adhesion failure. Furthermore, when the steel sheet is subjected to drawing or bending after lamination to the steel sheet, defects such as whitening, cracking, and peeling are likely to occur, and the cross section of the steel sheet also tends to be whitened in drilling.

On the other hand, from the viewpoint of film production, the viscosity of polypropylene resin changes greatly with time during calendering. If the proportion in the base resin is too high, the viscosity changes during processing and the homogeneity of the resin increases. It is difficult to obtain a proper film. Further, when the film is taken off from the calender roll, the film is easily broken.

According to the present invention, the base resin has an ethylene-propylene copolymer component and a polypropylene component in addition to the polypropylene resin (a), and has a content of 0.1 to 3 g / l.
An olefin-based thermoplastic elastomer (b) comprising a block or graft copolymer having a melt flow rate in the range of 0 minute, 25 to 75% by weight, an ethylene-propylene copolymer component and a polypropylene component, and 7 to 30 g
Olefinic thermoplastic elastomer (c) comprising a block or graft copolymer having a melt flow rate in the range of / 10 min.

These olefinic thermoplastic elastomers (b) and (c) may have a polybutylene component together with a polypropylene component.

In the present invention, the melt flow rate of (b) and (c) among the olefinic thermoplastic elastomers is measured in accordance with ASTM D 1238, and the temperature (d) is measured in accordance with JIS K 7210. It shall be measured under the conditions of 190 ° C. and a load of 2.16 kgf.

Of the above two types of olefinic thermoplastic elastomers, the component (b) imparts appropriate plasticity and rubber elasticity to the obtained film. From the viewpoint of production, the component (b) is a component that bears the melt tension necessary for peeling the resin composition from the calender roll. When the melt flow rate is higher than 3 g / 10 minutes, the resin composition does not have a sufficient melt tension, so that the resin composition cannot be stably peeled off from the calender roll. However, when the melt flow rate is less than 0.1 g / 10 min, the resulting resin composition has a high melt viscosity and the resulting film has a rough surface, ie, citron skin.

If the proportion of the component (b) in the base resin is too high, the film surface becomes uneven, making it difficult to obtain a film having a smooth surface. Further, from the viewpoint of manufacturing, when the film is taken off from the calender roll, the film is easily broken.

In the present invention, as the reactor TPO as the component (b), for example, Cataloy KS-353P of Montel SDK Sunrise Co., Ltd., PER-T310J, T310E, R410E, R21 of Tokuyama Co., Ltd.
0E or the like can be used.

The above-mentioned component (c) also imparts appropriate plasticity and rubber elasticity to the obtained film. From a manufacturing perspective,
(b) In cooperation with the component, the resin composition is provided with fluidity during calendering, and the resulting film is provided with stretchability and surface smoothness. However, when the proportion of the component (c) in the base resin is too high, the resulting film has low breaking strength and is liable to cause blooming and blocking. Further, at the time of calendering, the resin composition tends to stick to the roll.

Specific examples of the olefin-based thermoplastic elastomer include Cataloy KS-357P and KS-359P manufactured by Montell SDK Sunrise.

According to the present invention, the resin composition comprises (d) an olefin comprising an ethylene-butylene random copolymer having a melt flow rate in the range of 1 to 10 g / 10 minutes based on 100 parts by weight of the base resin. It may have 40 parts by weight or less, preferably 5 to 35 parts by weight of the thermoplastic elastomer.

This olefinic thermoplastic elastomer
As for (d), the melt flow rate is based on JIS K
Measurement shall be performed under the conditions of a temperature of 190 ° C. and a load of 2.16 kgf according to G.7210.

The component (d) imparts rubber elasticity to the resulting film, for example, so that neck-in is less likely to occur at the time of production. Further, the component (d) cooperates with the component (b) during calendering of the resin composition. And imparts stretchability to the resulting film.

When the proportion of the component (d) in the base resin is too high, the resulting film tends to cause blocking. Further, at the time of calendering, the resin composition tends to stick to the roll.

According to the present invention, the resin composition contains 5 to 40 parts by weight of at least one filler selected from calcium carbonate and talc based on 100 parts by weight of the base resin. As described above, by blending the filler with the resin composition, the obtained film is given an appropriate hardness and density, the workability as a decorative film for steel plate is enhanced, and the stringing at the time of punching the film is suppressed. It also has the effect of relaxing the temperature dependence of the viscosity during processing of the resin composition and stabilizing the processing behavior.

However, when the proportion of the filler is too low,
If the above effects cannot be obtained, and on the other hand it is too high,
Viscosity at the time of processing increases, resulting in poor appearance such as blurring of the obtained film, and extremely low elongation at break of the obtained film.

In particular, in the present invention, calcium carbonate may be obtained by pulverizing natural limestone or chemically synthesized. However, the calcium carbonate has a BET specific surface area of 0.8 to 20 m2 in accordance with JIS K 5101. It is preferably in the range of ² / g.

When the BET specific surface area of the calcium carbonate is too small, the particle size of the calcium carbonate is too large, and the resulting film is inferior in mechanical strength, brittle, and easily broken. On the other hand, when the BET specific surface area is too large, the particle size of the calcium carbonate is too small, the dispersion is poor in the resin composition, and the resulting film has poor mechanical strength.

On the other hand, if the proportion of calcium carbonate in the base resin is too small, the above effects cannot be imparted to the obtained film. However, if calcium carbonate is excessively blended with the polypropylene resin, during calendering, the lubricity of the roll becomes insufficient, and it becomes difficult to peel off the roll, or the film is easily cut, The film cannot be stably pulled from the roll.

In the present invention, the resin composition is conventionally
Lubricants, antioxidants, stabilizers, light stabilizers, UV absorbers, pigments, modifiers used in polyolefin resins,
It may contain a flame retardant, a filler, an antistatic agent, a fungicide, and the like.

Among them, particularly, as a stabilizer,
Hydrocalumite based on 100 parts by weight of the base resin,
Usually, by blending in an amount of 0.1 to 2 parts by weight, preferably 0.2 to 1 part by weight, it is possible to suppress deterioration of the surface properties of the resulting film due to bloom of low molecular weight components.

According to the present invention, the above-mentioned resin composition is further blended, if necessary, with the above-mentioned additives, and the resulting mixture is calendered. Good take-off from the film, the film can be obtained easily and stably, thus the resulting film has a smooth surface, uniform thickness, even in the production of a mode of winding on a long film, The film does not sag.

When a film is produced by calendering using the resin composition according to the present invention, the thickness of the film is preferably in the range of 40 to 250 μm, particularly preferably 50 to 200 μm. If the thickness is too thin, the film is perforated during processing, while if it is too thick, the resulting film is hard, and it becomes difficult to laminate it to a steel sheet, for example, as a decorative film for a steel sheet.

The film according to the present invention is prepared by blending the above-mentioned additives with the above-mentioned resin composition, if necessary, melt-kneading the obtained composition, and calendering the film. Depending on the type, the film is usually led to an embossing device provided immediately after the calendering device, or, once the film is manufactured, obtained as a separate step, guided to the embossing device and embossed on the film. be able to.

That is, if necessary, the resin composition
The additive is blended, and the obtained composition is heated and melted usually at a temperature of 150 to 200 ° C. by a continuous kneader, a Banbury mixer, a kneader, an extruder, etc., and kneaded. A roll temperature of 150 to 220 ° C., preferably supplied to a calender roll of 160 to 190 ° C., and after being rolled into a film of a required thickness, if necessary, this is made of a metal with a required drawing pattern, Usually, it is led to an embossing device composed of a combination of a steel embossing roll (rolled roll) and a heat-resistant semi-rigid rubber roll (pressure roll) that backs up the embossing roll, and embosses the film, thus obtaining the film according to the present invention. be able to.

[0054]

EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited by these examples. In Examples and Comparative Examples, the characteristics of the resin and the filler used for preparing the resin composition are as follows.

(A) Polypropylene resin: PM620A manufactured by Japan Polyolefin Co., Ltd. Die swell ratio (170 ° C.): 2.45 Die swell ratio (180 ° C.): 2.3 Elongation viscosity (170 ° C.): 5227 Pa · s Elongation viscosity (180 ° C.): 3373 Pa · s Melt tension (180 ° C.): Melt tension of 1 gf or more at a take-up speed of 5 m / min or more

(B) Olefinic thermoplastic elastomer:
Cataloy KS-353 manufactured by Montell SDK Sunrise
P, a block copolymer having an ethylene-propylene copolymer component and a polypropylene component, a melt flow rate of 0.45 g / 10 minutes (c) an olefin-based thermoplastic elastomer: Montell SD
K Sunrise Cataloy Cataloy KS-359
P, a block copolymer having an ethylene-propylene copolymer component and a polypropylene component, a melt flow rate of 12 g / 10 min. (D) Olefin-based thermoplastic elastomer: JSR Corporation
EBM2041, ethylene-butylene random copolymer, melt flow rate 3.5 g / 10 min

Calcium carbonate: MAX manufactured by Takehara Chemical Co., Ltd.
2080, BET specific surface area 1.2 m ² / g, average particle size 4.5
5.0 μm Talc: MX70TSN manufactured by Takehara Chemical Co., Ltd., BET specific surface area: 1.9 m ² / g Antioxidant: Antiox 10 hydrocalmite manufactured by NOF Corporation: E-13 pigment manufactured by Seishin Kasei Co., Ltd. ： Carbon HCM1717 manufactured by Dainichi Seika Co., Ltd.

(Elongational Viscosity) Twin capillary rheometer type RH7-2 (Long die length: 10 mm, long die diameter: 1.0 mm, short die length: 0.25 mm, short die diameter: 1.0 mm, die entrance angle) 180 °) and temperatures of 170 ° C. and 18 ° C.
The elongational viscosities at a shear rate of 10,000 (1 / sec) at 0 ° C. were determined.

(Die swell ratio) Twin capillary rheometer type RH7-2 manufactured by Rosand Precision (long die length 10 mm, long die diameter 1.0 mm,
Short die length 0.25mm, short die diameter 1.0m
m, die entrance angle 180 °), and the die swell ratio when the shear rate was 10,000 (1 / sec) at a temperature of 170 ° C. or 180 ° C. was measured.

(Melt tension) Capillograph 1C type (die length 10 mm, die diameter 1.0) manufactured by Toyo Seiki Seisaku-sho, Ltd.
mm, piston speed 30 mm / min, die entrance angle 180
°), the molten resin is extruded into a strand at a temperature of 180 ° C., and the strand is passed through a tension detection pulley attached to a tension detector, and is wound by a winding roll at a speed of 5 m / min or more. At this time, the tension applied to the strand was measured by a tension detector.

Examples 1 to 5 and Comparative Examples 1 to 4 As shown in Table 1, a polypropylene resin and an olefin-based thermoplastic elastomer were used as a base resin, and hydrocalumite, an antioxidant, a filler and a pigment were added thereto. Then, the mixture was kneaded and melted to obtain a resin composition.
Rolled at ~ 190 ° C.

The obtained film was subjected to bending whitening, scratch resistance, perforation and heat resistance tests as described below. Table 1 shows the results.

(Folding Whitening Property) A steel sheet laminated with a decorative film was bent at 90 ° at normal temperature (23 ° C.), 90 ° at low temperature (0 ° C.), and at normal temperature (23 ° C.) in accordance with JIS Z 2248. )
The film at the bent portion was examined for whitening or cracking.

(Scratch resistance) While applying a predetermined load,
The surface of the decorative steel plate was scratched with a coin or a nail, and whether or not a scratch was formed on the film was visually inspected.

(Punching Test) A punching test was performed on a decorative steel plate to visually check whether or not a beard-like stringing occurred in a cross section of the hole.

(Heat resistance) When the film is allowed to stand in an oven adjusted to a predetermined temperature for 5 minutes, there is no change in the embossed design or gloss on the film surface, and heat is applied at the maximum temperature at which the film shrinkage ratio is 5%. It was an index of sex. It has been empirically known that if the heat resistance temperature is 120 ° C. or higher, there is no problem in bonding to a steel sheet.

[0067]

[Table 1]

[0068]

According to the present invention, there is provided a resin composition comprising two types of olefinic thermoplastic elastomers having predetermined flow characteristics, a polypropylene resin having predetermined flow characteristics, and a filler. Has excellent calendering properties, and can be calendered to obtain a film stably. Further, the resulting film has all the required physical properties as a decorative film for steel plates.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a twin capillary rheometer used to measure the extensional viscosity and the die swell ratio of a molten polyolefin resin in the present invention.

FIG. 2 is an apparatus configuration diagram for measuring a melt tension in the present invention.

[Explanation of symbols]

2 ... Long die, 3 ... Short die, 4 ... Piston, 5
... pressure sensor, 21 ... capillary rheometer, 22
... Strand, 23 ... Tension detector, 25 ... Take-up roll 2.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C08L 23/12 C08L 23/12 51/06 51/06 53/00 53/00 F term (reference) 4F071 AA15X AA20 AA20X AA21X AA75 AA76 AA77 AA80 AA88 AB16 AB21 AB30 AE05 AE17 AH19 BB04 BC01 4F100 AA08B AC10A AC10B AK03B AK07A AK64B AK65B AL01B AL04B BA02 GB90 HB00B JA06A JA06B JB16B YY00B YB00B BB03 016002 BB01

Claims (4)

[Claims] 1. A decorative film for a steel sheet comprising a resin composition comprising 100 parts by weight of a base resin and 5 to 30 parts by weight of a filler, wherein (A) the base resin has a temperature measured by a twin capillary rheometer (a). At 170 ° C. and 180 ° C., the elongational viscosity is 2 when the shear rate is 10,000 (1 / second).
The die swell ratio in the range of 235 to 5816 Pa · s and the twin capillary rheometer at a temperature of 170 ° C. and 180 ° C. and a shear rate of 10,000 (1 / sec) is in a range of 1.1 to 2.5. Yes, take-up speed 5m at 180 ° C with capillary rheometer
0.1 to 40% by weight of a polypropylene resin having a melt tension of not less than 1 gf / min and (b) an ethylene-propylene copolymer component and a polypropylene component.
25 to 75% by weight of an olefinic thermoplastic elastomer comprising a block or graft copolymer having a melt flow rate in the range of 3 g / 10 minutes;
An olefin-based thermoplastic elastomer comprising a propylene copolymer component and a polypropylene component, and having a melt flow rate in the range of 7 to 30 g / 10 minutes or a graft copolymer. B) A decorative film for a steel sheet, wherein the filler is at least one selected from calcium carbonate and talc. 2. An olefin-based thermoplastic elastomer 40 comprising a (d) ethylene-butylene random copolymer having a melt flow rate in the range of 1 to 10 g / 10 minutes based on 100 parts by weight of the base resin. The decorative film for a steel sheet according to claim 1, which comprises not more than part by weight. 3. The calcium carbonate has a BET specific surface area of 0.8 to 2.
Cosmetic film for steel sheet according to claim 1 having a 0 m ² / g. 4. The decorative film for a steel sheet according to claim 1, wherein the resin composition contains 0.1 to 2 parts by weight of hydrocalumite as a stabilizer with respect to 100 parts by weight of the base resin.