JPS6233636A - Metallized 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] [Field of Industrial Application] The present invention relates to a vapor-deposited film, and more specifically, a film that has a uniform metal thin film layer, has excellent gloss, has a clear mirror image, and has good slip properties. related to vapor-deposited films.

[Prior art]

Conventionally, vapor-deposited films in which a light reflecting layer is integrated with the film have been used for applications such as gold and silver threads and Nehmer 1 reflecting mirrors. In order for this vapor-deposited film to exhibit an excellent aesthetic appearance, it goes without saying that it should have excellent reflectivity and gloss, and above all, it is most important that no vapor-deposition pattern occurs.

This vapor deposition type is used in the manufacturing process of oriented polynisder film and its various processing processes, where the electrostatic mottling that occurs on the film surface between films or between objects that come into contact with the film is the most common. This seems to be a major cause.

On the other hand, when handling film, if the compatibility between the films and objects that come into contact with the film is not good, it will be difficult to wind the film, and problems such as wrinkles will occur during the processing process. Therefore, it is also required that the film has good slipperiness.

However, it is difficult to improve all of these requirements at the same time. For example, to improve reflectivity and gloss, it is good to flatten the surface of the film, but as a result, the coefficient of static friction of the film increases (i.e., the slipperiness of the film worsens), and the surface of the film is more likely to become electrostatically charged. On the other hand, if a film with a rough surface is used, the slipperiness is improved, but the light rays are reflected diffusely, resulting in a decrease in gloss and blurring of CV1gII.

However, even in this case, the occurrence of charging spots on the plane of the film cannot be avoided, and therefore, it is not possible to create a surface free from IC vapor deposition. In such a film, the gloss seen from the non-deposited side is significantly lower than the gloss seen from the vapor-deposited layer side of a film containing particles of an inert substance, and the decorative effect is diminished.

[Purpose of the invention]

As a result of intensive research on vapor deposited films free of such defects, the present invention uses an oriented polyester film containing two types of inert substances with a specific average particle size range in a specific ratio as a base film, and By applying a uniform corona treatment to the surface to create 1/L mottling in the °C range, it was found that the vapor-deposited film had no vapor-deposited layer and was able to impart excellent slipperiness without impairing transparency and gloss. Output LC1 is what the present invention has been achieved.

An object of the present invention is to provide a vapor-deposited film in which a uniform thin metal FA layer is formed, excellent gloss, a clear mirror image, and good slipperiness.

[Structure and effects of the invention]

The present invention uses 0.01 to 0.29 weight percent of inert material with an average particle size of 0.01 μm to 0.8 μm and an average particle size of 1 μm.
．． 0 μm to 10 μm inert material FBlo, o o s
After applying uniform corona treatment to one side of an oriented polyester film containing ~0.02% by weight, gold #
The thin film J- is a #-layered film.

In the present invention, polyniskel,
In particular, 21111 stretched films of aromatic linear polyesters (e.g., polyethylene derephthalate, polyethylene-2,6-naphthalene dicarboxylate, etc.) have excellent thermal dimensional stability, little moisture absorption, and are easy to handle in the vapor deposition process. It can be applied because it is easy to coat.

The polyester used in the present invention may contain stabilizers, 2 colorants, 11! antifouling agent, lubricant.

It may contain a selling agent and other additives.

The oriented polyester film of the present invention is one in which an inert material having a specific average particle diameter range and an inert material (B) having a specific average particle diameter range are oriented in a specific ratio. C, the particle sizes of the 2a class inert materials have different characteristics. The film substrate of the present invention, in which a specific amount of inert particles are used in combination, has an excellent gloss that cannot be obtained by using only one type of inert substance or simply using two or more types of inert substances in the prior art. , transparency, smoothness and workability.

Examples of the inert substance (4) at °C include aluminum silicate, calcium phosphate, kaolin, and silica.
Even for other inert substances, the average particle size is 0.01 JJm
It is sufficient if the thickness is in the range of ~0.8 μm. Note that aluminum silicate may be a fired product or a hydrate (and silica may be crystalline or amorphous).

Inert substances (as Hl, calcium carbonate.

Examples include silica, and other inert substances may be used as long as they have an average particle size in the range of 1.0 μffl to 10 μm.

When using a single inert substance, the average particle size is 1 μm
If an inert substance in the following range is contained, a film with good gloss and transparency will not have satisfactory slip properties due to the balance with the contained lid, and a film with good slip properties will have a particularly strong milky white color, making gloss and transparency unsatisfactory. Become something. The average particle type is 1.
When polyester contains a coarse inert substance with a diameter of 0 μm or more alone, a film with good slipperiness will have satin-like unevenness on the film surface and will have low gloss and transparency.

In the present invention, an appropriate amount of a large inert substance (81) having an average particle diameter in the range of 1 μm to 10 μm is contained to mainly improve slipperiness, and the average particle diameter is in the range of 0.01 to 0.8 μm. An appropriate amount of a small inert substance (5) is added as an auxiliary agent to improve slipperiness.

In addition, even if two or more types of inert substance particles are used together in specific amounts, if the inert substance (B) with an average particle size in the range of 1 to 10 μm is less than 0.005t&%, the slipperiness of the film will be poor and processing will be difficult. This is not preferable because it impairs workability. Also, 0.
If the weight exceeds 0.02%, satin-like unevenness will be noticeable on the surface of the film, and the gloss and transparency will be low.

Average particle size is 0. Inert material concentration in the range of O1 to 0.8 μm is 0.01! If it is less than 0.2%, there is no effect on improving the film's slipperiness, and if it exceeds 0.29%, the film will become milky white and have poor gloss and transparency.

As in the present invention, 0.01 to 0.29% by weight of an inert material with an average particle size in the range of 0.01 to 0.8 μm and 0.01 to 0.29% by weight of an inert material with an average particle size in the range of 1.0 to 10 μm. 005
A polyester film containing up to 0.02 m% by weight has good gloss and transparency, as well as good slipperiness and workability.

The inert substance used in the present invention is an ethylene glycol slurry (1), a classification device (for example, P-66 manufactured by Tomoe Kogyo Co., Ltd.)
Particles in the desired particle size range can be obtained by classifying the particles using a particle size analyzer (0 Super Decancou). Of course, if the commercially available inert material does not have the preferred particle size, well known means such as sand milling the dispersion of the inert material may be used. Note that the particle size referred to in the present invention is Stokes (5joke)
s) diameter, and the average particle diameter is determined by determining the particle size composition ratio and creating an integrated curve $1! L, the particle size showing an accumulation rate of 50% is defined as the average particle size (μm).

The polyester film serving as the base material can be manufactured in the following manner. A predetermined weight of inert material and a coarse particle size of inert material (B) are added to the polyester.

It can be added before the polymerization of the polyester (or even during the polymerization reaction, or it can be kneaded in an extruder when pelletizing after the polymerization is completed and the temperature is good. Furthermore, it can be added when melt-extruding into a sheet and dispersed in the extruder. C. extrusion at C.degree. C. may also be used, but it is preferable to add it before or during the polymerization process so that the dispersion state is uniform.

The polyester film targeted by the present invention is a biaxially stretched film. This film is stretched in biaxial directions (e.g. longitudinal and transverse directions) at a stretching temperature in the range of C70 to 120'C and a stretching ratio of 2 to 5 times (area stretching ratio of 8 to 22 times).
C can be obtained by stretching and heat setting at 200 to 245°C for 1 to 30 seconds. The stretching ratios in the biaxial directions may be equal or unequal, and also include methods such as longitudinal stretching→transverse stretching→re-longitudinal stretching, or transverse stretching→longitudinal stretching.

The base material of the vapor-deposited film of the present invention is required to have a high degree of transparency. The oriented polyester film serving as the base material has a total haze of 4% or less, particularly preferably 3% or less when converted to a thickness of 25 μm. By adding two types of inert substances with different particle sizes, the substrate film can maintain its transparency. The thickness of the base film is 3
~100 μm, preferably 4 to 75 μm.

Next, uniform corona treatment on different surfaces of the oriented polyester film will be described.

As mentioned above, the oriented polyester film comes into contact with various 810-layers during the manufacturing process, or because the films come into contact with each other during winding, the surface of the resulting film is usually charged and does not recover easily. However, this charging state is irregular and patchy.

When metal vapor deposition is applied to a film with such a surface state that clearly has electrostatic spots, the vapor deposition surface exhibits electrostatically charged spots, and as a result, it is impossible to obtain a vapor deposited film that is uniform and has good gloss (ゝO In order to eliminate this S flaming, in the present invention, corona treatment is applied to the film surface before metal vapor deposition, but the difference is that this coating treatment is done uniformly. If the coating process cannot be obtained, charging spots on the film surface will be promoted, resulting in severe deposition spots.

In order to perform uniform corona treatment, the inventor of the present invention has conducted various studies and found that it is first necessary to obtain uniform corona discharge, and in order to achieve this, it is necessary to maintain a specific distance between the electrode and the roll. Furthermore, they have found that it is important to maintain the film running speed within a specific speed range. That is, the distance between the electrode and the roll should be in the range of 0.5 vm or more and 1.5 vm or less, preferably 0.5*1 or more, and Omi+ or less, and the film running speed should be s o m/min or more and 150 m/min or more. min or less, preferably 50 m/min or more 100 m/min
When the range is less than m/min, uniform corona discharge can be obtained.

If the above distance is narrower than 0.5 degrees, the running film may come into contact with the electrode and damage the film surface;
, 5u+ is not preferable because discharge spots occur and a uniform treated surface cannot be obtained. Further, if the film running speed is faster than 200 m/min, a uniform corona discharge treated surface cannot be obtained, while if it is slower than 50 m/min, it is not preferable from the viewpoint of productivity.

In the present invention, a metal thin film layer is provided on one side of the corona discharge treated distribution film. As a method for forming a thin metal film on a film surface, physical vapor deposition such as a vacuum evaporation method and a sputtering method is usually used.

In the case of vacuum evaporation, the evaporation source is preferably heated by Elect+817 beam heating, and the degree of vacuum is 3 x ] 0
-' to IX10-'Torr, the evaporation source temperature is appropriately selected from the range of 1400 to 1800°C.

In the case of sputtering method, usually 5
An argon gas atmosphere of about X 10-'' Torr is employed.

The vapor-deposited film obtained in this way is made of gold and silver thread, mirrors,
It can be suitably used for applications such as naming.

Next, the main methods for measuring physical properties employed in the present invention will be described.

1. Corona treatment spots Sprinkle powdered slaked lime on the surface of the film after corona treatment, let it cool down to ℃, and visually judge. The grading will be as follows.

○: There are no vapor deposition spots at all.

Δ: Slight vapor deposition spots are visible, but there is no practical problem.

×: Vapor deposition spots were observed and the product failed to meet the level of the present invention.

2. Particle size and composition ratio of the inert substance Using a high sludge automatic sedimentation balance, calculate the settling time corresponding to each particle size in °C using Stokes' equation, and calculate the settling time range corresponding to each particle size range. The amount of M of the inert substance within that sedimentation time range is determined, and the ratio to the total polymerization of the inert substance is expressed as a composition ratio in %.

3. Obtain the composition ratio using the method described in Average Particle Size Measurement Method 2, create an integration curve that integrates the particles in order from the larger to the smaller particle size (100% at a particle size of 0 μm), and The average particle size (μm) is the particle size shown.

4. Coefficient of static friction: A fixed glass plate is placed under the two stacked films, and the film on the bottom side of the stacked films (the film that is in contact with the glass plate) is taken up with a constant speed roll ( Approximately 1
0 to 15 cm/min), a detection end is fixed to one end of the upper film (in the opposite direction to the pulling direction of the lower film), and the tensile force between the films is detected. The Suntudo used at that time has a weight of 1 to 3 kliJ and a lower surface area of 10 to 3 kliJ.
Use a 100crL one.

5. Volume appearance: Graded from 1st grade to 5th grade. IIQX500u+.

After providing a vapor deposition layer and a release layer on a film having a length of 32,000 m, it was rolled up onto a roll. The appearance of this roll is evaluated by measuring the number of wrinkles on the film surface and the number of protrusions caused by wrinkles with a major diameter exceeding 11 m, and grading the rolls as follows: %.

0 pieces 1st grade 1-2 pieces 2nd grade 3-51 solid 3 grade 6-1oI (support) 4th grade (fail) 11 or more grade 5 (fail) 6. All haze: according to JIS-6714 Measure and percentage (unit %)
Display in .

7. Glossiness: Measure the glossiness on both sides of a film with aluminum vapor deposited on one side at ℃ using a new model manufactured by Murakami Color Technology Research Co., Ltd. It is expressed as a relative value when the degree is set to 100. still,
A relative value of 70 or higher is considered a pass.

Example The present invention will be explained in detail below using specific examples.

Examples 1 to 6 and Comparative Examples 1 to 10 Dimethyl terephthalate and ethylene glycol were used as raw materials at 0°C, manganese acetate was used as a transesterification catalyst, anti-7/trioxide was used as a polymerization catalyst, and phosphorous acid was used as a stabilizer. Polyethylene terephthalate was produced.

At that time, as an inert substance in ethylene glycol,
By dispersing Kaori, silica or calcium carbonate and keeping it at
(see 1).

The obtained polymer was melt-extruded by a conventional method to form a film, and the stretching temperature was 90 to 120"C9 transverse magnification 3.6 times 9M1 magnification 3
．． Biaxially stretched at 9 times and heat set at 220°C to form a film of 425μ
A biaxially oriented film of m was obtained.

Next, one side of the biaxially oriented film was coated with a commercially available ordinary copier.
Using a processing machine, the distance between the electrode and the roll was 0.8 mm,
Processing was carried out at a film feed speed of 100 m/min.

In addition, as a result of sprinkling powdered slaked lime on the film surface after carrying out this corona treatment and observing the treatment state, no spots were observed.

Aluminum was deposited on one side of the obtained film to a thickness of about 0.1 μm by a conventional method under reduced pressure of about 10' Torr to form a vapor deposition film.

Table 1 shows the properties of the obtained vapor-deposited film.

In addition, for comparison, a "C" vapor-deposited film was obtained in the same manner as above except that the Cop discharge treatment was not performed.Furthermore, a vapor-deposited film was obtained by changing the amount of inert material added outside the scope of the present invention. Table 1 shows the properties of the obtained vapor deposited film.

Claims (2)

[Claims] (1) Inert material A with an average particle size of 0.01 μm to 0.8 μm 0.01% to 0.29% by weight and inert material B with an average particle size of 1.0 μm to 10 μm 0.005% by weight to 0 A vapor-deposited film obtained by subjecting the surface of an oriented polyester film containing .02% by weight to corona treatment and then providing a metal thin film layer thereon. (2) The vapor-deposited film according to claim 1, wherein the total base of the oriented polyester film is 4% or less when converted to a film thickness of 25 μm.