JP3074327B2 - Olefin resin film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic film made of an olefin resin used as a surface decorative material for furniture, home appliances, building materials and the like.

[0002]

BACKGROUND ART Conventionally, as a so-called decorative film as described above, a vinyl chloride resin (hereinafter, referred to as PVC) film is mainly used. However, there is a concern that the PVC film generates HCl gas at the time of incineration or combustion, and there is a movement to remove PVC from the viewpoint of environmental protection.

[0003] In order to solve this problem, olefin-based resins have attracted attention as a substitute for PVC. However, as is well known, olefin-based resins are generally inferior in processability to PVC, so that it is difficult to produce the decorative film having excellent design properties at low cost, and it is difficult to use decorative materials in recent years. It has been shunned to this day as a product that does not meet the marketability required for highly productive products.

On the other hand, lead, hexavalent chromium, cadmium and the like as pigments for coloring the film are not concerned with promoting thermal deterioration of the film (that is, resin constituting the film) and have less progress of discoloration deterioration. Heavy metal-based compounds, such as However, heavy metal compounds including lead, hexavalent chromium, cadmium, etc.
Various environmental issues are of concern.

[0005]

An object of the present invention is to solve the above-mentioned problems of a PVC film and the environmental problems derived from pigments for coloring the film in the above-mentioned circumstances. An object of the present invention is to provide an inexpensive cosmetic film that can be used.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present inventors dared to use (a) an olefin resin which has been shunned to date. Can be produced without difficulty and therefore at low cost. (B) In the case of a cosmetic film using PVC as a constituent resin, heat deterioration of the constituent resin has been promoted and discoloration deterioration has been promoted so far. With the knowledge that iron oxide-based pigments that have been considered unsuitable for use as pigments to be used can be used without any problem of deterioration of both,
The present invention has been proposed.

That is, the film of the present invention is made of an olefin resin, has a thickness of 0.03 to 0.2 mm, and has at least an olefin resin 10 as a colorant.
It is characterized by containing 0.5 to 30 parts by weight of titanium oxide and 0.1 to 10 parts by weight of iron oxide per 0 parts by weight, and having a hiding degree of 0.5 to 3 represented by the following formula.

[0008]

## EQU2 ## Hiding degree = log1 / T (where T (transmittance) = I / Io Io is incident light, I is transmitted light)

The olefin resin in the present invention includes polyethylene; polypropylene; ethylene-vinyl acetate copolymer resin; ethylene-acrylic copolymer resin such as ethylene-methyl acrylate copolymer resin;
A propylene copolymer resin or the like can be used. Above all, isotactic homo, random or block polypropylene having hardness suitable as a cosmetic film is suitable.

[0010] However, when using the above-mentioned isotactic polypropylene as the olefin resin has a narrow softening temperature range where the embossed grain can grant, poor embossing suitability After the resulting film. Therefore, it is desirable to blend polyethylene, especially low-density polyethylene, in order to improve post-embossing suitability. If the proportion of the polyethylene blend is too small, the blending effect will not appear,
If the amount is too large, the amount of isotactic polypropylene is relatively too small to obtain a suitable hardness as a cosmetic film, so that 100 parts by weight of isotactic polypropylene is not added to polyethylene (preferably low density polyethylene). 10) to 300 parts by weight, preferably 30 to 200 parts by weight, are suitable.

The above-mentioned film can be produced by means such as a T-die extrusion method, a calendering method, an inflation method and the like, and the production method is not particularly limited. In order to improve the properties, it is preferable to blend syndiotactic polypropylene with the above-mentioned isotactic polypropylene. If the blend ratio of the syndiotactic polypropylene is too small, the blending effect is not exhibited, and if it is too large, the amount of the isotactic polypropylene is relatively too small, so that a suitable hardness as a cosmetic film can be obtained. Therefore, 5-200 parts by weight of syndiotactic polypropylene is suitable for 100 parts by weight of isotactic polypropylene.

Further, in order to improve the impact resistance of the film, the above-mentioned isotactic polypropylene or a blend thereof with polyethylene or syndiotactic polypropylene is mixed with ethylene-propylene rubber, water-added SBR, It is desirable to incorporate a rubber component such as polybutene. The mixing ratio of the rubber component varies depending on the desired impact strength, and cannot be unconditionally determined.
In the film of the present invention, the olefin resin 100
The amount may be appropriately selected from the range of 10 to 200 parts by weight based on the desired impact strength.

As the titanium oxide which is one of the coloring agents to be mixed with the olefin resin, rutile-type and anatase-type titanium oxides generally used as ordinary white pigments called titanium white can be used. From the viewpoint of light resistance and weather resistance, a rutile type is preferable.

Iron oxide which is another one of the coloring agents blended with the above titanium oxide includes FeOOH, Fe ₂
O ₃ , Fe ₃ O ₄ , Fe ₃ O ₄ .H ₂ O and the like can be used, and in particular, FeOOH (that is, a pigment called “iron yellow”) and Fe ₂ O ₃ (that is, a pigment that is called “red iron red”) ) Can be suitably used. These iron oxides may be used alone or in combination of two or more.

The amounts of titanium oxide and iron oxide are 0.5 to 30 parts by weight of titanium oxide and 0.1 to 10 parts by weight of iron oxide based on 100 parts by weight of the olefin resin. If the amount is too small, not only the hiding power of the film will be insufficient, but also the desired coloring will not be obtained, and if it is too large, the processability of the olefin resin composition containing these coloring agents will be deteriorated. In particular, when the hardness is high and the thickness is thin, as in the case of a cosmetic film, the deterioration of the processability becomes remarkable. That is, when the film of the present invention is manufactured by the calendering method, both ends of the film are cut off after rolling with a calender roll, but if the content of titanium oxide or iron oxide is too large, the hardness is particularly high. In the case of a film having a small thickness, the cut portion (so-called "ear cut") tends to occur in the middle of the cut operation, and if the cut edge occurs, the cutting operation cannot be continued and the work efficiency is reduced. Extremely bad. Further, when the film of the present invention is manufactured by an extrusion method, if the blending amount of titanium oxide or iron oxide is too large, the droplets of the composition adhere to the lip portion of the extrusion die in a so-called “eye repellent” shape. Such a phenomenon often occurs that the droplets fall on the film immediately after extrusion and contaminate the surface state (referred to as "eye stain" of the film).

The above-mentioned coloring agent may be mixed as it is with the olefin resin in any of titanium oxide and iron oxide as a pigment. Not only does not provide a desired color, but also tends to cause color shift and lack hue stability. Therefore, it is necessary to use a material that has been diluted with an olefin resin in advance (that is, a diluted pigment). desirable. As the olefin resin for dilution at this time, a resin having excellent compatibility with the olefin resin used in the film of the present invention (particularly preferably the same type of resin) is used. When using such a blend, it is easy and reliable to use a olefin resin having a melting point equal to or lower than the melting point of the olefin resin having the highest melting point in each of the olefin resins to be blended. It is desirable to obtain

Regarding the degree of dilution, in each of the titanium oxide-diluted pigment and the iron oxide-diluted pigment, the pigment concentration (namely, titanium oxide concentration and iron oxide concentration) in each of these diluted pigments is as follows.
Each of the pigments (titanium oxide, iron oxide) is selected from a range of about 1 to 70 wt% in accordance with a desired blending amount.
Select and use an appropriate dilution.

In the film of the present invention, in addition to the above components, if necessary, an antistatic agent, an antioxidant, a light stabilizer, a lubricant, an ultraviolet absorber, the above-mentioned lead and hexavalent chromium Additives such as coloring agents other than heavy metal compounds including cadmium and the like may be blended. Colorants other than the heavy metal compounds include carbon black, organic polyazo brown, quinacridone magenta, perylene red, polyazo red, pyrrole red, isoindolinone yellow, and polyazo yellow, and inorganic titanium yellow. And the like can be used.

The film of the present invention has a thickness of 0.03 to 0.2 for practical reasons as a cosmetic film.
It is important that the degree of concealment represented by the above formula in mm is 0.5 to 3.

In the film of the present invention comprising the above-mentioned components and having the above-mentioned characteristics, a pattern or a character may be printed on one side or both sides. The printing ink may be any ink that can be adhered to the olefin resin, but is preferably a urethane ink or a thermosetting ink containing no halogen from the environmental point of view described above. 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, prior to printing, the surface to be printed of the film of the present invention may be subjected to a corona discharge treatment or the like.

Further, in the film of the present invention, embossing can be performed, and so-called valley printing can be performed on a concave portion carved by embossing. The embossing is performed by a method of embossing at the same time when a film is produced by a T-die extruder, a calendar, or the like, or a post-embossing method of embossing in a later step after the film is produced. The embossing may be performed after the printing is performed, or may be performed before the printing. When embossing is performed prior to printing, the surface roughness (Ra) should be 1.5 μm or less in consideration of printability.
Preferably, it is applied so as to have a satin shape of 0.2 to 1.0 μm.

As described above, the surface of the film of the present invention, which has been subjected to printing or embossing as required, has 55
Total light transmittance of 5 nm is 70% or more, and thickness is 0.03 to
A substantially transparent olefin-based resin film having a thickness of 0.2 mm and containing a hindered amine (light stabilizer) and an ultraviolet absorber can also be laminated. As the hindered amine, compounds as shown in Chemical formulas 1 and 2 can be used. As the ultraviolet absorber, benzophenone-based compounds,
Known UV absorbers such as benzotriazoles can be used.

[0023]

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[0024]

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The amount of hindered amine to be added to the substantially transparent olefin resin film is as follows.
The amount of the ultraviolet absorber is preferably 0.05 to 2.0 parts by weight based on 100 parts by weight of the olefin resin. By laminating this substantially transparent olefin-based resin film, it is possible to protect the printing and improve the expressiveness of a deep design, and to obtain a cosmetic film made of an olefin-based resin excellent in weather resistance. it can.

The substantially transparent olefin-based resin film can be produced by means of a T-die extrusion method, a calender method, an inflation method or the like, as in the case of the above-mentioned film of the present invention. The lamination of the substantially transparent olefin resin film and the above-mentioned film of the present invention is performed by a method using an appropriate adhesive, a method by heat fusion, or the like. At this time, if necessary, corona discharge treatment can be used together.

One side or both sides of the substantially transparent olefin-based resin film can be subjected to printing or embossing, if necessary, similarly to the above-mentioned film of the present invention, and can be engraved by embossing. So-called valley printing can be applied to the recessed portion. This printing, embossing, or the like may be performed in advance before lamination, or may be performed after lamination. When embossing is performed prior to printing, the surface roughness (Ra) is 1.5 μm or less, preferably 0.2 to 1.0 as in the above-described film of the present invention.
It is desirable to apply it so that it has a μm satin shape.

When the lamination of the substantially transparent olefin resin film and the above-mentioned film of the present invention is carried out by using an appropriate adhesive, the adhesive surface is taken into consideration in consideration of the adhesive strength. The surface on the side where
a) It is desirable to perform embossing so as to form a matte surface of 0.2 μm or more, preferably 0.2 to 5.0 μm. However, when printing is performed after embossing on the surface on the side to be the adhesive surface, this is not a limitation, and the surface roughness (Ra) is 1.5 μm or less, preferably 0.1 μm or less, as described above.
It is desirable to perform embossing so as to have a satin shape of 2 to 1.0 μm.

Further, in the film of the present invention, as the backing material (backing material), a transparent, translucent or opaque olefin resin film of the same type or different from the olefin resin of the above-mentioned film of the present invention is laminated. You may. The transparent, translucent or opaque olefin-based resin film as the backing material is also similar to the above-described film of the present invention or the substantially transparent olefin-based resin film, such as a T-die extrusion method, a calendar method, an inflation method, and the like. The backing material and the film of the present invention can be laminated by a method using an appropriate adhesive, a method by heat fusion, or the like.If necessary, a corona discharge treatment may be used in combination. Can also.

[0030]

【Example】

Examples 1 to 8 and Comparative Examples 1 to 2 Using an olefin resin composition having the composition shown in Table 1, 9
In a 0 mm single screw extruder, the thickness of the embossing roll pressed on the film surface is 0.7 μm with a satin squeezed surface having a roughness of 0.7 μm at a cylinder temperature of 220 ° C. and a die temperature of 210 ° C. A .1 mm inventive and comparative film was produced.

Table 1 shows the result of observation of the workability at this time and the degree of concealment of the product film. In addition, the quality of workability was evaluated based on the occurrence frequency of so-called "eye stain" when extruded under the above conditions,
The case where "eye stain" did not occur, or even if it was very slight, was regarded as good, and the case where "eye stain" occurred frequently was regarded as difficult.

[0032]

[Table 1-1]

[0033]

[Table 1-2]

Examples 9 to 10 and Comparative Example 3 Using an olefin resin composition having the composition shown in Table 2, using a calender at a roll temperature of 185 ° C., apply a surface roughness (Ra) ) 0.5μ
A film of the present invention and a comparative film having a thickness of 0.1 mm and having a matte iris of 0.1 m were produced.

Table 2 shows the results of the observation of the workability at this time and the degree of concealment of the product film. The quality of workability is evaluated by the frequency of occurrence of so-called "cut ears" when calendering is performed under the above conditions. Was evaluated as good, and the case where "ears cut" frequently occurred was regarded as difficult.

[0036]

[Table 2]

Example 11 After applying a corona discharge treatment to the surface of the film of the present invention of Examples 1 to 8 to which a matte squeezed surface having a surface roughness (Ra) of 0.7 μm was applied on the embossing roll squeezed surface. , Wood grain pattern printing was performed using black urethane ink mixed with carbon black. Then, syndiotactic polypropylene /
With respect to 100 parts by weight of low-density polyethylene (60/40), 0.2 parts by weight of hindered amine (trade name "ADK STAB LA-63" manufactured by Asahi Denka Co., Ltd.), 0.2 parts by weight of benzophenone-based ultraviolet absorber, and phenol-based antioxidant Embossing roll squeezing produced by an extruder using an olefin resin composition containing 0.2 parts by weight of an agent (trade name "ADK STAB AO-60" manufactured by Asahi Denka Co., Ltd.) and 0.005 parts by weight of phthalocyanine blue as a raw material. A 0.1 mm-thick substantially transparent film (with a total light transmittance of 555 nm of 86%) in which a matte finish having a surface roughness (Ra) of 2 μm is provided on the film surface of the pressed surface is applied to the printing surface. Lamination was performed using an adhesive to obtain a laminated film.

Example 12 After a corona discharge treatment was applied to the surface of the film of the present invention of Examples 9 to 10 to which a satin squeezed surface having a surface roughness (Ra) of 0.5 μm was given on the embossed roll squeezed surface. , Wood grain pattern printing was performed using black urethane ink mixed with carbon black. Then, isotactic homopolypropylene / isotactic random polypropylene / low density polyethylene / syndiotactic polypropylene (2
0/30/40/10) to 100 parts by weight of a hindered amine (trade name "ADK STAB LA-6" manufactured by Asahi Denka Co., Ltd.).
3)) 0.2 parts by weight, 0.2 parts by weight of a benzotriazole ultraviolet absorber, 0.2 parts by weight of a phenolic antioxidant (trade name “ADK STAB AO-60” manufactured by Asahi Denka Co., Ltd.)
Using an olefin-based resin composition to which 0.005 parts by weight of phthalocyanine blue was added as a raw material, a satin drawing having a surface roughness (Ra) of 2 μm was formed on the film surface of the embossing roll pressing surface, which was produced by a calender at a roll temperature of 185 ° C. And a 0.1 mm thick substantially transparent film (5
After laminating the above-mentioned printing surface with an adhesive, the resulting film was embossed with a wood grain to obtain a laminated film.

A combustion test was conducted on the printed and laminated cosmetic films of the present invention of Examples 11 to 12, and
No evolution of HCl gas was observed. Further, discoloration due to irradiation with a sunshine weatherometer for 1500 hours was extremely small, and the weather resistance was excellent.

[0040]

As described above, according to the film of the present invention, the following effects can be obtained. (1) There is no concern that HCl gas is generated during incineration or combustion, and no heavy metal-based compound is used, which is preferable from the viewpoint of environmental protection. (2) A cosmetic film having excellent design properties can be manufactured at low cost, and an excellent marketability can be expected as a decorative film having high decorativeness. (3) Since it has excellent weather resistance and extremely little discoloration, it is suitable for long-term use as a cosmetic film.

Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) C08J 5/18 C08L 23/00 C08K 3/22 B32B 27/32 B32B 27/20

Claims (3)

(57) [Claims] An olefin resin having a thickness of 0.03
A film of 0.2 to 0.2 mm, containing at least 0.5 to 30 parts by weight of titanium oxide and 0.1 to 10 parts by weight of iron oxide per 100 parts by weight of the olefin resin as a coloring agent, and An olefin-based resin film having a hiding degree of 0.5 to 3. ## EQU1 ## Opacity = log1 / T (where T (transmittance) = I / Io Io is incident light, I is transmitted light) 2. The method according to claim 1, wherein the iron oxide is FeOOH and / or FeOOH.
Olefin resin film of claim 1 wherein the ₂ O _3. 3. A substantially transparent olefin containing a UV absorber and a hindered amine compound on the surface side and having a total light transmittance of at least 70% at 555 nm and a thickness of 0.03 to 0.2 mm. The olefin-based resin film according to claim 1, wherein the olefin-based resin film is laminated.