JPH1180446A - Film made of olefin resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a film having a surface improved in scratch resistance by forming an olefin resin compsn. prepd. by compounding an olefin resin with a hydrogenated styrene-isoprene rubber into a film with a specified thickness. SOLUTION: An olefin resin compsn. is prepd. by compounding 100 pts.wt. olefin resin (e.g. an isotactic polypropylene or a high-density polyethylene having a density of 0.94-0.97 g/cm<3> , pref. 0.95-0.96 g/cm<3> ) with 3-50 pts.wt., pref. 5-30 pts.wt., hydrogenated styrene-isoprene rubber having a styrene content of 5-30 wt.% and, if necessary, calcium carbonate having an average particle size of 0.05-2.0 μm in an amt. of 5-50 wt.% of the sum of the foregoing polymers. The compsn. is formed into a film with a thickness of 0.05-0.2 mm e.g. by calendering, extrusion or inflation. At least one side of the film is printed or embossed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film made of an olefin resin, which is excellent in preventing scratches on the surface and is preferably used for surface decoration of furniture, home appliances, building materials and the like.

[0002]

2. Description of the Related Art Conventionally, a vinyl chloride resin film has been mainly used as a cosmetic film used for surface decoration of building materials and the like. On the other hand, in recent years, it has been attempted to use a film made of an olefin resin instead of the vinyl chloride resin film.

[0003]

However, since the decorative film as described above requires a certain degree of rigidity, a film made of an olefin resin is preferably made of isotactic polypropylene or high-density polyethylene having excellent rigidity. Are being studied. However, a film made of an olefin resin such as isotactic polypropylene or high-density polyethylene,
It had a disadvantage that the surface was easily scratched.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to improve the anti-scratch property of the surface of a film made of an olefin resin such as isotactic polypropylene or high-density polyethylene. Is what you do.

[0005]

The olefin-based resin film of the present invention made to solve the above-mentioned problems is obtained by mixing 3 to 50 parts by weight of a hydrogenated styrene-isoprene rubber per 100 parts by weight of the olefin-based resin. The olefin-based resin composition is formed by molding into a film having a thickness of 0.03 to 0.2 mm.

The olefin resin used in the present invention includes polyethylene such as low-density polyethylene, linear low-density polyethylene, ultra-low-density polyethylene, and high-density polyethylene; and polypropylene such as homopolypropylene, random polypropylene and block polypropylene. Polypropylene; copolymer resins with ethylene-based vinyl acetate and unsaturated carboxylic esters (methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, etc.); ethylene-propylene copolymer resins; Although a resin or a mixed resin thereof can be used, isotactic polypropylene or high-density polyethylene is preferable as a cosmetic film.

The isotactic polypropylene selected to obtain a film suitable as a cosmetic film includes isotactic homopolypropylene,
Either isotactic random polypropylene or isotactic block polypropylene can be used. Among them, isotactic homopropylene having particularly excellent rigidity is preferable.

The film obtained by using the above isotactic polypropylene has a narrow softening temperature range in which embossing can be performed, and has a post-embossing property (after film production,
Poor workability when embossing is performed in a later step). Therefore, it is desirable to mix low-density polyethylene with isotactic polypropylene in order to improve the embossability thereafter. If the mixing ratio of the low-density polyethylene in this case is too low, almost no improvement in post-embossing property is observed, and if it is too high, a film having sufficient rigidity as a cosmetic film cannot be obtained. 10 to 3 parts per 100 parts by weight of polypropylene
00 parts by weight, more preferably 30 to 200 parts by weight.

A film using the above isotactic polypropylene can be formed by means such as a T-die extrusion method, a calender method, and an inflation method, and the forming method is not particularly limited. When a film is formed by a calender method, it is desirable to mix syndiotactic polypropylene with this isotactic polypropylene in order to improve the calenderability. If the mixing ratio of the syndiotactic polypropylene in this case is too low, little improvement in calendering properties is seen, and if it is too high, a film having sufficient rigidity as a cosmetic film cannot be obtained. It is desirable to use 5-200 parts by weight for 100 parts by weight of tic polypropylene.

The high-density polyethylene selected for obtaining a film suitable as a cosmetic film preferably has a density of 0.94 to 0.97 g / cm ³ , more preferably 0.95 g / cm ^3. ~ 0.96 g / cm ³
belongs to. When the density is less than 0.94 g / cm ³ , the resulting film has insufficient rigidity and is not suitable as a cosmetic film. When a material having a density exceeding 0.97 g / cm ³ is used, The resulting film is inferior in impact tear strength and is not suitable as a cosmetic film.

As described above, in order to obtain a film suitable as a cosmetic film, isotactic polypropylene (low-density polyethylene,
(Including mixtures with syndiotactic polypropylene)
Alternatively, high density polyethylene is selected and used,
As long as the properties are not impaired, the above isotactic polypropylene or high-density polyethylene may be mixed with another olefin resin as described above.

As the hydrogenated styrene-isoprene rubber to be mixed with the olefin-based resin, those having a styrene component in the range of 5 to 30% by weight are preferable. Also,
The hydrogenated styrene-isoprene rubber may contain a monomer component other than styrene and isoprene.

Further, a rubber other than the hydrogenated styrene-isoprene rubber may be used in combination as long as the properties of the obtained film are not impaired. Specific examples of the other rubber include an ethylene-propylene rubber, a hydrogenated styrene-butadiene rubber, an ethylene-butene rubber, and a rubber made of a copolymer of ethylene and an α-olefin having 6 to 10 carbon atoms. When these other rubbers are used in combination, the content is desirably less than 50% by weight of the total rubber.

The mixing ratio of the hydrogenated styrene-isoprene rubber is 3 to 50 parts by weight, preferably 5 to 30 parts by weight, based on 100 parts by weight of the olefin resin. If the amount of the hydrogenated styrene-isoprene rubber to be mixed is too large, the resulting film will have poor rigidity, and if the amount of the hydrogenated styrene-isoprene rubber to be mixed is too small, the scratch resistance of the film surface is improved. Is hardly seen.

In order to further improve the rigidity of the olefin resin film of the present invention, it is desirable to add calcium carbonate to the mixture of the olefin resin and the hydrogenated styrene-isoprene rubber. The amount of the calcium carbonate added is 5 per 100 parts by weight of the total of the olefin resin and the hydrogenated styrene-isoprene rubber.
５０50 parts by weight, preferably 5-30 parts by weight. If the amount of calcium carbonate is less than the above range,
There is no significance to add calcium carbonate, if the amount added is more than the above range, the resulting film becomes brittle,
The impact tear strength is significantly reduced. In order to improve the rigidity of the obtained film while suppressing the decrease in the impact tear resistance, it is desirable to use calcium carbonate having an average particle size of 0.05 to 2.0 μm.
The calcium carbonate may be surface-treated with stearic acid or the like in order to improve dispersibility.

The olefin resin composition for obtaining the olefin resin film of the present invention may contain, if necessary, an antistatic agent, an antioxidant, a light stabilizer such as a hindered amine compound, an ultraviolet absorber. Agents, coloring agents and the like can also be added. In addition, inorganic powders other than the above-described calcium carbonate can be added as long as the properties of the obtained film are not impaired.

The coloring agent used for coloring the olefin resin film of the present invention includes titanium oxide, iron oxide, titanium yellow, carbon black, polyazo brown, quinacridone magenta, perylene red, polyazo red, pyrrole red, and the like. One or more colorants selected from isoindolinone yellow and polyazo yellow are preferred.

The olefin resin composition comprising the above
The film is formed into a film having a thickness of 0.05 to 0.2 mm by an appropriate means such as a calendering method, an extrusion method, and an inflation method, and the olefin resin film of the present invention is obtained.

The olefin resin film of the present invention obtained as described above may be printed on one side or both sides. The printing ink used at this time may be any ink as long as it is an ink adhered to the olefin resin film, but from an environmental point of view, a urethane ink containing no halogen is used. Thermosetting inks are preferred. As a printing method using these inks, a printing method such as a screen printing method, a gravure printing method, a flexographic printing method, and an offset printing method can be adopted. Of course, before printing, a corona discharge treatment may be applied to the printing surface of the film. Further, in order to improve the adhesion of the printing ink, it is desirable to perform printing after providing a primer treatment layer.

The olefin-based resin film of the present invention can be embossed, or so-called valley printing can be applied to the recesses carved by embossing. The embossing is performed by a method of embossing simultaneously with the production of a film using a calender or a T-die extruder, or a post-embossing method of embossing in a later step after the production of the film.

Further, the olefin resin film of the present invention may be formed by laminating an olefin resin film or an acrylic resin film separately produced. At this time, an appropriate adhesive may be used.

[0022]

The present invention will be described in more detail with reference to the following Examples.
The present invention is not limited to the embodiments described below.

Examples 1 to 3 and Comparative Examples 1 to 3 Using an olefin resin composition having the composition shown in Table 1,
With a single screw extruder having a cylinder temperature of 220 ° C. and a die temperature of 210 ° C., an olefin resin film having a thickness of 0.1 mm was obtained. The resulting film was evaluated for scratch resistance and rigidity. The results are shown in Table 1.

[0024]

[Table 1]

Examples 4 to 6, Comparative Examples 4 to 6 An olefin resin composition having the composition shown in Table 2 was molded with a calender at a roll temperature of 150.degree.
m was obtained. The resulting film was evaluated for scratch resistance and rigidity. The results are shown in Table 2.

[0026]

[Table 2]

[0027]

As described above, the olefin resin film of the present invention is excellent in surface scratch resistance, which is an important property as a cosmetic film. Further, by using isotactic polypropylene or high-density polyethylene as the olefin-based resin, a film having rigidity suitable as a cosmetic film can be obtained.

Claims (4)

[Claims] 1. A method according to claim 1, wherein 100 parts by weight of the olefin resin is
An olefin resin composition obtained by mixing 3 to 50 parts by weight of a hydrogenated styrene-isoprene rubber has a thickness of 0.05 to
An olefin resin film obtained by molding into a 0.2 mm film. 2. The olefin resin film according to claim 1, wherein the olefin resin is isotactic polypropylene. 3. The olefin resin film according to claim 1, wherein the olefin resin is high density polyethylene. 4. An olefin resin and hydrogenated styrene-
The olefin resin film according to any one of claims 1 to 3, wherein 5 to 50 parts by weight of calcium carbonate is added per 100 parts by weight of the total amount of the isoprene rubber.