JPH031944A - Decorative film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to decorative films.

Specifically, the present invention relates to a decorative film having pearlescent luster and specular luster.

(Conventional technology) House N! ! Decorative resin films with a pearlescent luster are used for the exterior of products and for the packaging of luxury products. In order to give a film a pearlescent luster, it is known to print light-reflective ink on the surface of the film, for example, but since printing is a flat process, there is no diffused reflection of light, and it does not create a three-dimensional effect. The drawback is that it lacks a sophisticated and luxurious feel.

On the other hand, in order to impart a three-dimensional pearlescent luster, a method has been proposed in which extremely fine pearl pigment particles are dispersed in a resin film. The aim is to create a pearlescent luster effect by diffusely reflected light from a certain angle, but since the pearl pigment particles are extremely fine, the diffusely reflected light is difficult to recognize with normal vision. However, if the base film has high transparency, light diffusely reflected near the bottom of the film will also be added, resulting in a pearl-like luster as a whole. In particular, when the film surface is curved, the three-dimensional effect of the pearl pigment particles is emphasized and a beautiful pearlescent luster is imparted.

However, when such a pearlescent gloss film is laminated with, for example, a biaxially oriented polyethylene terephthalate film in order to further impart specular gloss, a considerable amount of light is reflected and absorbed by the film, and the pearlescent gloss effect is lost. be damaged. Furthermore, if the transparency of the base film is low, or if the film is lightly colored, a considerable portion of the diffusely reflected light in the deep layers of the film will be absorbed by the base film, reducing the overall diffusely reflected light, resulting in a pearlescent overall effect. The toning gloss becomes extremely poor, and this tendency is particularly noticeable when the film surface is used in a flat state.

As a countermeasure to this problem, it is possible to increase the amount of pearl pigment particles added and increase the pigment particle density on the film surface layer to increase the diffusely reflected light. Not only is this disadvantageous, but there is a risk that the function of the pearl pigment may be reduced. In other words, pearl pigments are made by coating the surface of mica particles with a thin film of titanium oxide, but as the amount of pigment added increases, the thin film of titanium oxide peels off due to the high heat and friction during the kneading operation, resulting in the formation of pearl pigments. functions are likely to be impaired. Furthermore, if the amount of pearl pigment increases, the strength of the film itself will be impaired.

(Problems to be Solved by the Invention) The present invention is capable of producing pearl-like luster due to diffusely reflected light even when a film with low transparency or a lightly colored film is used as a substrate, or when the film surface is flat. The object of the present invention is to obtain a decorative film that is sufficiently effective and has specular gloss.

(Means for Solving the Problems) The present inventors have solved the above-mentioned problems caused by the prior art, and as a result of their studies, have identified a A decorative film layer made of a thermoplastic resin film with a specific thickness in which pearl Br4 material particles with a particle size of The present invention was realized based on the knowledge that this object can be achieved by this method. That is, the gist of the present invention is that the pearl pigment particles dispersed in 99 to 70 parts by weight of the thermoplastic resin are 1 to 30 MI! A film with a thickness of 30 to 120 μm made of a resin composition containing a proportion of tilIi3, wherein the particle size of the pearl pigment particles is 60 to
The amount of particles of 1201II11 is 1 to 30% by weight based on the total amount of the thermoplastic resin and pearl pigment particles,
In addition, the amount of pearl pigment particles with a particle size of 60 μm is 40 μm with respect to the amount of pearl pigment particles with a particle size of 60 to 120 μm.
% by weight or less, and the pearl pigment particles with a particle size exceeding 120 μm have a particle size of 60~! a decorative film layer that is 5% by weight or less based on the amount of pearl pigment particles of 20 μl;
When the specular gloss is 100% or more, the haze value (If a
The present invention is a decorative film formed by laminating a specular gloss film layer having a value of 8% or less.

The present invention will be explained in detail below.

Examples of the base resin constituting the decorative film layer containing pearl pigment particles of the present invention include polyethylene, polypropylene, ethylene-propylene copolymer, polybutene 1
, olefin resins such as ethylene-vinyl acetate copolymer; styrenic resins such as polystyrene, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene terpolymer; nylon 6, nylon 6-6,
Amide resins such as nylon 6-IO, nylon 10, nylon eyes, nylon 12; vinyl chloride resins such as polyvinyl chloride, polyvinylidene chloride, vinyl chloride-vinyl acetate copolymer; polyethylene terephthalate, polybutylene terephthalate, etc. A thermoplastic resin commonly used for film molding, such as an ester resin, is used.

The decorative film layer consists of the above thermoplastic resin and pearl pigment particles dispersed therein.

Pearl Ijt material particles are conventionally known as
Mica particles coated with a thin film of titanium oxide are used. It is necessary that the pearl pigment particles be blended in a ratio of 1 to 30 parts by weight to 99 to 70 parts by weight of the thermoplastic resin. In other words, it is 1 to 30% by weight based on the total amount of the thermoplastic resin and pearl pigment particles. If the amount of pearl pigment particles is less than 1% by weight of the total amount, the proportion of pearl pigment particles in the film will be sparse, and the excellent pearlescent gloss intended by the present invention will not be obtained, and the decorative film It is not appropriate as Furthermore, if the blending amount of pearl pigment particles exceeds 30% by weight of the total amount, it becomes extremely difficult to uniformly disperse the pigment particles into the film, and due to high heat and friction when kneading the pearl pigment particles into the resin. , pearl pigment particles are 11i! As a result, the function of the pearl pigment is impaired.

The particle size of the pearl pigment particles is 60~
It is necessary that the thickness be 120μ, preferably in the range of 70 to 110μ.

It is desirable that particles with a particle size of less than 60 μm do not exist at all, but even if they exist, N fj = 1jU - 1jU
It is necessary that the amount is 40% by weight or less based on the amount of μm particles. Particle size: 60 μm Ungrooved particles have a particle size of 60 to 120 μm
If the amount exceeds 40% by weight based on the amount of pigment particles, when dispersed in a film, the pearl-like luster that can be visually recognized will not be sufficient, and the beautiful pearl-like luster caused by pigment particles with a particle size of 60 to 120 μ- The toning gloss will be diluted.

Similarly, it is desirable that particles with a particle size force t exceeding 120 μm do not exist at all, but even if they exist, the particle size is 60 to 1
Particles with a particle size exceeding 120 μm must be 5% by weight or less based on the amount of particles in a 20 μm particle size.
If the amount exceeds 5% by weight based on the amount of particles of 1207Lw, the particle size is too large for a normal film thickness,
The unevenness on the film surface becomes noticeable. In particular, when a specular gloss film layer to be described later is laminated on this decorative film layer, surface irregularities lead to irregularities on the laminated film surface and also reduce adhesiveness.

The thickness of the decorative film layer needs to be 30 to 1201III+, and if the thickness is 30μ, there is a risk that the pearl pigment particles will largely deviate from the film.
There is also a problem with strength. Also, the thickness of the film is 6f12
If it exceeds 0 μm, problems will arise in terms of flexibility of the film, ease of handling such as processability, cost, etc. In addition to the pearl pigment particles, the decorative film layer may be colored by adding coloring pigments such as black, blue, pink, and green to an extent that does not impair the pearl luster. Gives a pearlescent luster with a texture. Further, if necessary, well-known antiblocking agents, heat stabilizers, antioxidants, ultraviolet absorbers, antistatic agents, etc. can be blended.

The decorative film layer is formed by tri-blending the base thermoplastic resin, pearl pigment particles and, if necessary, other components mentioned above in a predetermined ratio, melt-mixing using an extruder, etc., and forming the mixture into a pellet. This pellet may be molded to a thickness of 30 to 120 μm by a conventional molding method, such as a T-die molding method or an inflation molding method.

On the other hand, the specular gloss film layer to be laminated with the above decorative film layer has a specular gloss of 100% or more, preferably 14
A smooth transparent film with specular gloss is used, which has a haze value of 0% or more and a haze value of 8% or less, preferably 4% or less, as measured by JIS K6714. Specifically, biaxially stretched polyethylene terephthalate film (PET film), polypropylene film (O
Examples include PPTPP method), nylon film, and the like.

The specular gloss film layer is laminated on one or both sides of the decorative film layer depending on the purpose of use. The surface of the specular glossy film layer may be subjected to weather resistance treatment as long as its transparency, surface smoothness, hardness, etc. Printing or the like may be applied to a certain extent.

The thickness of the specular glossy film layer is desirably in the range of 15 to 200 .mu.m, with 25 to 100 .mu.m being particularly preferred. If the thickness is 15 μm without grooves, if the decorative film layer has some unevenness, the uneven surface may appear directly on the surface and spoil the appearance, and if the thickness exceeds 200 μm, the cost will be high and The pearlescent luster of the decorative film layer may be impaired.

As a method for laminating the decorative film layer and the specular gloss film layer, a known lamination method that does not impair transparency and smoothness is employed. For example, dry laminating adhesive,
Heat lamination method using hot melt adhesive,
An extrusion lamination method, a multilayer coextrusion molding method, etc. are used.

(Example) The present invention will be explained in more detail with reference to Examples below.
The present invention is not limited to these embodiments unless it exceeds the gist thereof.

Examples 1 to 6 and Comparative Examples 1 to 5 Polyethylene powder with density port 91 translation Met Index (old) 3.5, having the average particle size and particle size distribution shown in Tables 1 and 2, titanium oxide on the surface of mica particles Pearl pigments coated with a thin film of
The mixture was melt-kneaded at 160° C. using a 0 mm extruder to form pellets.

The obtained pellet was made into a 50φ machine manufactured by Sumitomo Heavy Industries, Ltd.
MRA extruder with lip clearance of 0.7mm,
Using a T-die molding machine equipped with a T-die with a total die length of 480 mm and a cooling air knife (position 11 m from the die lip, room temperature), the extrusion temperature was 180°C and the winding speed was 2.
．． It was extruded into a film under the conditions of an Ova of 1 minute and a draft rate of 28, and was cooled at a cooling roll temperature of 20° C. to produce a film with a thickness of 60 μm.

The decorative film obtained above was coated using a gravure roll dry laminator with a surface length of 450 mm, an oven length of 5 m, and a mesh number of 100, at a line speed of 20/min, and under the conditions of a polyurethane adhesive coating amount of 38/2 steel. The 0 film was dry laminated with the specular gloss film shown in Tables 1 and 2.
Next, the obtained laminated film was placed in an oven for 4
Aging treatment was performed at 5°C for 70 hours.

In addition, the biaxially stretched polyethylene terephthalate film (PET) used in the examples and comparative examples shown in Tables 1 and 2
, JIS Z874 for biaxially oriented nylon film (Nylon) and biaxially oriented polypropylene film (OPP)
Specular gloss (Gloss) measured according to 1 and JISI
Haze value (I(aze val) measured by 6714
ue) were as follows.

Tables 1 and 2 show evaluation results for the laminated film obtained by the above method, including the degree of pearlescent gloss, the degree of diffused reflection, and the degree of unevenness of the film. The evaluations in Tables 1 and 2 were conducted as follows.

(1) Degree of pearlescent gloss: The degree to which particles can be visually distinguished from the surrounding matrix.

◎ Knees can be clearly identified 61 0: Discernible if you look carefully x 2 Undiscernible (2) Degree of diffused reflection: When the film is placed on a flat surface, light is reflected in various directions. Degree to which it can be distinguished visually ◎ Knee clear and distinguishable O: Distinguishable if you look carefully × 2 Not distinguishable (3) Degree of unevenness of film: 30-40. The degree to which unevenness on the film surface can be seen from a distance of cm ◎: Almost smooth O: When you look carefully, you can see unevenness. By laminating a thermoplastic resin film layer of a specific thickness in which pearl pigment particles of a specific particle size are dispersed in a specific amount ratio, and a transparent film layer having a specific specular gloss, pearl pigment particles can be produced. Its presence can be confirmed visually, and it has a pearlescent gloss effect due to diffusely reflected light with a three-dimensional effect, as well as excellent specular gloss, making it useful for packaging luxury goods, for example.

Claims (1)

[Claims] (1) A film with a thickness of 30 to 120 μm made of a resin composition containing 99 to 70 parts by weight of a thermoplastic resin and 1 to 30 parts by weight of pearl pigment particles dispersed therein. , the particle size in the pearl pigment particles is 60~
The amount of particles with a diameter of 120 μm is 1 to 30% by weight based on the total amount of the thermoplastic resin and pearl pigment particles, and the amount of pearl pigment particles with a particle size of less than 60 μm is
40% by weight based on the amount of pearl pigment particles of ~120 μm
or less, and the amount of pearl pigment particles with a particle size exceeding 120 μm is 5% by weight or less based on the amount of pearl pigment particles with a particle size of 60 to 120 μm, and a mirror gloss (Gloss) of 100% or more. , haze value
A decorative film formed by laminating a specular gloss film layer having a value of 8% or less.