JP2003238702A - Polyolefin film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prepare a polyolefin film using a polypropylene capable of manufacturing by calendering, having no slack even if made in a long roll, and not liable to whiting even if it is folded. <P>SOLUTION: This polyolefin film is prepared by compounding 5-25 pts.wt. thermoplastic olefin elastomer comprising a polypropylene resin containing 25-90 wt.% ethylene/propylene rubber to 100 pts.wt. resin component comprising a polypropylene and a high density polyethylene, and the compounding quantity of the polypropylene to the total resin component is 51-90 wt.% and that of the high density polyethylene is 10-49 wt.%, and the film thickness is 0.04-0.6 mm, and which is molded by calendering. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyolefin film which has no slack even if it is a long roll and does not cause a defective appearance due to whitening during bending.

[0002]

2. Description of the Related Art Conventionally, as a cosmetic film, one made of vinyl chloride has been widely used. However, from the viewpoint of environmental load, an olefin resin is used as a plastic that does not contain chlorine and has a low environmental load. It has come to be used as a film for commercial use.

Typical olefin resins include polypropylene (PP) resin and polyethylene (PE) resin. Polypropylene resin has a higher melting point than polyethylene resin and is bonded at a high temperature of 200 ° C. or higher. Since it can also be used as a cosmetic film for steel plates, it is preferably used as a material for cosmetic films.

However, the polypropylene resin has a drawback that it is not able to withstand the stress of being peeled off from the roll during calendering because it has a weak tension when melted and is cut. Therefore, the cosmetic film made of polypropylene resin is produced by the T-die method, but the extruder has a small discharge amount, which causes a problem of cost increase.

In order to give a tension to the polypropylene resin at the time of melting by calendering, polypropylene resin 1
There is a means of adding 10 parts by weight or more of rubber to 100 parts by weight. However, when the rubber component is blended in such a large amount, it becomes too soft as a cosmetic film, so that there is a problem that it is easily scratched and is difficult to be applied. Further, if the rubber component is added as it is, the compatibility with polypropylene is poor, and there is a problem that whitening occurs during bending.

[0006] Therefore, in the conventional technique, it is difficult to use a polypropylene resin suitable as a material for a cosmetic film to produce a film used for a cosmetic material by calendering without impairing its excellent properties. It was

[0007]

In view of the above situation, the present invention uses polypropylene which can be produced by calendering, has no slack even in a long roll, and does not whiten when folded. It is intended to provide a polyolefin film.

[0008]

SUMMARY OF THE INVENTION The present inventors have described the above by adding high density polyethylene (HDPE) to polypropylene and by using a thermoplastic olefin elastomer (TPO) as a rubber component. It has been found that the problems of the prior art can be solved. That is, the present invention comprises 5 to 25 parts by weight of a thermoplastic olefin elastomer composed of a polypropylene resin containing 25 to 90% by weight of ethylene-propylene rubber based on 100 parts by weight of a resin component composed of polypropylene and high density polyethylene. A polyolefin film formed by blending,
The amount of polypropylene blended is 51 to 90% by weight, and the amount of high-density polyethylene blended is 10 with respect to the entire resin component.
˜49% by weight, thickness is 0.04 to 0.6 mm, and is a polyolefin film formed by a calendering method. The present invention is described in detail below.

The polyolefin film of the present invention comprises polypropylene and high-density polyethylene as resin components. The polypropylene used in the present invention is preferably random polypropylene. Homopolypropylene has a too high melting point and becomes insufficiently melted by calendering, and a film using block polypropylene is not preferable because it is whitened when folded.

The polypropylene used in the present invention preferably has a melt flow rate (temperature 230 ° C., load 2.16 kg) measured according to JIS K 7210 of 0.3 to 15 g / 10 minutes. . Polypropylene with a melt flow rate of less than 0.3 g / 10 min is not commercially available and has a melt flow rate of 15 g / 1
If it exceeds 0 minutes, the viscosity is low and it is difficult to peel it off from the roll during calendering.

The high-density polyethylene used in the present invention is not particularly limited and may be appropriately selected and used according to the application, but the melt flow rate (temperature 230 ° C., measured according to JIS K 7210, Load 2.
Those having 16 kg) of 0.03 to 3 g / 10 minutes are preferably used. Melt flow rate is 0.03g / 10
High-density polyethylene having a content of less than 10 minutes is not commercially available, and if the melt flow rate exceeds 3 g / 10 minutes, the viscosity is low and it is difficult to peel it off from the roll during calendering.

The polyolefin film of the present invention further comprises a thermoplastic olefin elastomer (T) composed of a polypropylene resin containing ethylene-propylene rubber.
PO). As the thermoplastic olefin elastomer, one containing 25 to 90% by weight of ethylene-propylene rubber is used. When the content of ethylene-propylene rubber is less than 25% by weight, the property as an elastomer is lost, and there is no effect of improving the tension at the time of melting of polypropylene, and when it exceeds 90% by weight, it is not an elastomer in the same manner. Poor compatibility with polypropylene and high-density polyethylene. The blending amount of the thermoplastic olefin elastomer is 5 to 25 parts by weight with respect to 100 parts by weight of the resin component. 5
If it is less than 25 parts by weight, the effect of improving the tension at the time of melting is not recognized, and if it exceeds 25 parts by weight, the obtained film becomes too soft and the scratch resistance deteriorates.

In the present invention, the blending amount of polypropylene is 51 to 90% by weight based on the whole resin component,
The compounding amount of the high-density polyethylene is 10 to 49% by weight based on the whole resin component. When the blending amount of polypropylene is less than 51% by weight with respect to the entire resin component, the heat resistance of the obtained film is insufficient, and when it is attached to a steel plate, the embossing as a design on the surface disappears. On the other hand, the blending amount of high-density polyethylene is 10 with respect to the entire resin component
If it is less than 20% by weight, the tension at the time of melting will be insufficient unless the addition amount of the thermoplastic olefin elastomer is more than 25 parts by weight, and as a result, the amount of the thermoplastic olefin elastomer will increase, so that the obtained film will be soft and resistant. The scratch resistance is reduced.

The polyolefin film of the present invention preferably further contains calcium carbonate and / or talc. The amount of calcium carbonate and / or talc compounded is 5 to 4 with respect to 100 parts by weight of the resin component.
It is preferably 0 part by weight. If it is less than 5 parts by weight, the adhesive force of the obtained film to the plywood is weak, and if it exceeds 40 parts by weight, the tearing force of the film is weakened. The calcium carbonate has a BET specific surface area of 2
Those having a weight ratio of up to ²⁰ m ² / g are preferably used. 2m ²
If it is less than / g, the particle size is too large, so that the tear strength of the obtained film becomes small, and if it exceeds 20 m ² / g, the melt viscosity of the raw material composition becomes high and the bank does not rotate, so that the smoothness of the film becomes poor. become worse. As the talc, one having an average particle diameter of 1 to 15 μm can be used. If the thickness is less than 1 μm, it is not commercially available.
When it exceeds m, the tear strength of the obtained film becomes small.

The polyolefin film of the present invention may further contain a lubricant. The lubricant is not particularly limited, and examples thereof include metal salts of higher fatty acids such as stearic acid, lauric acid and behenic acid such as Ca, Zn, Mg and Ba; higher fatty acid amides such as stearamide and palmitoamide; 2000 low molecular weight polyethylene, bis-stearamide such as methylene bis-stearamide, fatty acid ester such as butyl stearate, ester wax such as stearyl stearate and myricyl serotinate, polyhydric alcohol such as glycer monostearate The partial ester thereof and the like can be mentioned. The amount of the lubricant blended is preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the resin component.

The polyolefin film of the present invention may also contain an antioxidant. The antioxidant is not particularly limited, and examples thereof include 2,6-di-t-
Butyl hydroxytoluene, tetrakis (methylene 3-
(3,5-di-t-butyl-4-hydroxyphenyl)
Propionate) methane, n-octadecyl 3- (3,3
Hindered phenolic compounds such as 5-di-t-butyl-4-hydroxyphenyl) propionate; phosphite esters such as trisnonyl phosphite and tris (2,4-di-t-butylphenyl) phosphite Can be mentioned. The blending amount of the above antioxidant is
It is preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the resin component.

The polyolefin film of the present invention may further contain a light stabilizer. The light stabilizer is not particularly limited, and examples thereof include benzotriazole-based compounds, benzophenone-based compounds, cyanoacrylate-based compounds, phenyl salitrate-based compounds, and hindered amine-based compounds. The amount of the light stabilizer compounded is preferably 0.01 to 5 parts by weight with respect to 100 parts by weight of the resin component.

The polyolefin film of the present invention may also contain a pigment. The pigment is not particularly limited, for example, titanium oxide, carbon black, iron oxide, azo compounds, phthalocyanine compounds,
Examples thereof include titanium oxide, antimony oxide, and nickel oxide solid solution. The amount of the pigment blended is preferably 0 to 50 parts by weight with respect to 100 parts by weight of the resin component.

The thickness of the polyolefin film of the present invention is 0.04 to 0.6 mm. If it is less than 0.04 mm, it will be difficult to produce it by the calendering method because holes will be opened during processing, and if it exceeds 0.6 mm, the obtained film will be too hard and it will be difficult to bond it to the substrate. Become.

The polyolefin film of the present invention is formed by calendering. The method of molding the polyolefin film of the present invention by calendering is not particularly limited, but it can be prepared, for example, as follows. First, polypropylene, high-density polyethylene, thermoplastic olefin elastomer, additives, pigments, etc. are mixed. This is a continuous kneader, Banbury mixer, kneader, extruder, etc.
Knead by heating at ℃ to melt. The molten resin is supplied to a calender roll having a roll temperature of 150 to 220 ° C. and rolled to obtain a film of 0.04 to 0.6 mm. As a calendar, 3 types, 4 types L, 4 types inverted L, 4 types Z, 6
A commonly used one such as a book type can be used.

The polyolefin film of the present invention is produced by calendering, and does not slacken even when it is a long roll, and it does not whiten when folded. The polyolefin film of the present invention as described above is used as a makeup material by being attached to an inorganic plate such as MDF, particle board, a wood plate such as a laminated plate, a metal plate, a gypsum board, etc., which is used for building materials, furniture, electric appliances and the like. It can be used as a film or wallpaper.

[0022]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

Films (Sample Nos. 1 to 13) were prepared with the formulations shown in Table 1. The raw materials of the films shown in Table 1 are as follows. HDPE1; Novatec HD HB332 (manufactured by Nippon Polychem) Melt flow rate 0.4 g / 10 minutes HDPE2; M8500 (manufactured by Keiyo Polyethylene Co., Ltd.) Melt flow rate 5.0 g / 10 minutes HDPE3; Hi-Zex 8200B (manufactured by Mitsui Chemicals, Inc.) Melt flow Rate 0.03 g / 10 minutes PP1; FK841 (manufactured by Chisso Corporation) Melt flow rate 5.5 g / 10 minutes PP2; Hipol J850Y (manufactured by Mitsui Chemicals) Melt flow rate 20 g / 10 minutes PP3; Novatec EG8 (manufactured by Nippon Polychem) ) Melt flow rate 0.7 g / 10 minutes TPO1; T310E (manufactured by Idemitsu Petrochemical Co., Ltd.) Rubber content
60% TPO2; E2900 (made by Idemitsu Petrochemical Co., Ltd.) rubber
30% EP rubber; Esplen SPO V0113 (Sumitomo Chemical Co., Ltd.)

The obtained film was subjected to the following evaluations.
The results are shown in Table 1. (1) Evaluation item (1-1) Calender processability (adhesiveness, cuttability, presence / absence of pinhole) With respect to 100 parts by weight of PP, HDPE and TPO in total,
Whiten P-70 (manufactured by Shiraishi Industry Co., Ltd., BET specific surface area 1.0 m ² / g) 20 parts by weight, Irganox 1076
0.2 parts by weight (manufactured by Nippon Ciba Geigy) and 0.2 parts by weight of calcium stearate were added, and the mixture was heated and melted with a BB mixer to give a kneaded product at 150 to 180 ° C. This is fed to a four-inch inverted L-shaped roll type 24-inch calender and rolled to a predetermined thickness at a roll temperature of 160 to 190 ° C.,
Embossing was performed using an embossing roll heated to 40 to 100 ° C. at a film temperature of 100 ° C. or higher. At this time, the viscosity is too low to peel off from the roll,
The tension at the time of melting was so low that the film was not cut, and the obtained film was visually checked to see if there were pinholes.

(Adhesiveness) Can be separated from the roll: ○ Cannot be separated from the roll: × (Cutability) Do not cut when detached from the roll: ○ Cut off when separating from the roll: × (Presence or absence of pinhole) There is a pinhole: ○ No pinhole: ×

(1-2) Adhesion workability: 10% at 23 ° C. based on JIS K 6734
The modulus was measured and evaluated as follows. Less than 10 kg / cm ○ 10 to 12 kg / cm △ more than 12 kg / cm ×

(1-3) Bending whitening film A sample having a width of 25 mm and a length of 200 mm was cut in the width direction of the film, and the central portion was bent at 5 ° C. to confirm the color of the bent portion. No whitening: ○ Whitening: ×

(1-4) Scratch resistance A pencil scratching test was conducted according to JIS K 5400. If it is harder than 3B, it can be put to practical use, and if it is softer than 4B, it cannot be put to practical use.

(1-5) A heat-resistant steel sheet was coated with an adhesive, dried well, and then heated to 250 ° C. to bond the films. Immediately thereafter, the sample was prepared by cooling with water. The embossed pattern on the surface of the sample was visually compared with that before bonding. No change: ○ Less unevenness: ×

[0030]

[Table 1]

[0031]

INDUSTRIAL APPLICABILITY According to the present invention, MD which is used for building materials, furniture, electric appliances, etc., which has no slack even if it is a long scroll, and does not cause a defective appearance due to whitening during bending.
F, particle board, laminated film such as wood plate, metal plate, gypsum board and other inorganic plates, used as a decorative film or wallpaper, is a polyolefin resin that does not generate harmful hydrogen chloride gas or dioxin when incinerated. Can be provided to the market at low cost.

Continued front page    F term (reference) 4F071 AA16 AA16X AA20 AA20X                       AA88 AF53 AH03 AH12 AH19                       BB04 BC01 BC12                 4J002 BB032 BB121 BB124 BB153                       FD010 FD040 FD070 FD090                       FD170 GC00 GF00 GL00                       GQ00

Claims (3)

[Claims] 1. A thermoplastic olefin elastomer consisting of a polypropylene resin containing 25 to 90% by weight of ethylene-propylene rubber based on 100 parts by weight of a resin component consisting of polypropylene and high density polyethylene.
A polyolefin film containing 25 parts by weight, wherein the content of polypropylene is 51 to 90% by weight, the content of high-density polyethylene is 10 to 49% by weight, and the thickness is Is 0.04 to 0.6 m
m, and is a polyolefin film formed by a calendering method. 2. The polypropylene is JIS K 721.
Melt flow rate (temperature 23
The polyolefin film according to claim 1, wherein the polyolefin film has a temperature of 0 ° C and a load of 2.16 kg of 0.3 to 15 g / 10 minutes. 3. High-density polyethylene is JIS K 7
210 melt flow rate (temperature 230 ° C., load 2.16 kg) measured according to 210 is 0.03 to 3 g / 10
The polyolefin film according to claim 1 or 2, wherein the polyolefin film is minute.