JPS5818934B2 - Polyethylene terephthalate film for vapor deposition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polyethylene terephthalate film for deposition.

More specifically, the present invention relates to a polyethylene terephthalate film which, by vapor-depositing a metal such as aluminum, provides a vapor-deposited film having excellent properties suitable for applications such as gold-silver systems and transfer marks.

To produce a gold-silver based film from a polyethylene terephthalate film, a metal such as aluminum or silver is deposited under vacuum on one side of a biaxially stretched polyethylene terephthalate film, and then a white coating is applied with an epoxy-based, polyurethane-based, or other resin. After that, the process of cutting it into strips and weaving them on a loom is generally adopted.

The transfer mark film is made by applying a release agent to a biaxially stretched polyethylene terephthalate film, then depositing metal under vacuum, and then applying an adhesive to form a laminate. By placing the adhesive side of the body on the subject and pressing the heated stamp from the film side, the metal vapor deposited film that touches the convex part of the stamp is transferred to the subject, and the gold or silver pattern engraved on the stamp can be seen. transcribed.

Polyethylene terephthalate film has excellent transparency, mechanical properties, chemical resistance, etc., and has many uses, but it has a problem with slipperiness, and therefore lacks workability such as winding.

As a method for improving the slipperiness, it is known to roughen the surface by adding various inert substances such as silica, kaolin, talc, alumina, aminosilicates, diatomite, china clay, etc.

However, when these inert substances are added according to conventional methods, although the slipperiness is improved, there are disadvantages such as a decrease in transparency and the formation of irregularities on the surface.

Moreover, according to the findings of the present inventors, when metal is vapor-deposited on such a film, when the film is wound,
Contact between the metal surface and the film surface often causes numerous scratches on the metal surface in the machine direction (according to a microscope, it is observed that the metal has been peeled off from the scratched areas).

), which significantly reduces the value of the final product.

The inventors of the present invention have conducted various studies in view of this point, and have found that when a polyethylene terephthalate film obtained by adding a specific amount of kaolin with a specific particle size is made into a laminate by vapor-depositing metal, the metal side and the film side The present invention was completed by discovering that there is no difference in gloss, that the metal surface is less likely to be scratched during the winding process, and that workability is good.

That is, in the present invention, 200 to 3000 ppm of kaolin with an average particle size of 0.2 to 3.0 μm is added, and
The product of the average particle size (μ) and the amount added (ppm) is 300 to 1
The polyethylene terephthalate for vapor deposition is characterized by having a

The present invention will be explained in more detail.

In the present invention, polyethylene terephthalate refers to polyethylene terephthalate alone, polyethylene terephthalate in which a copolymer component is present to an extent that does not impair the properties, and a blend with other polymers. Specifically, polyethylene terephthalate units include 70 It is a polyester containing mol% or more.

In order to produce the polyethylene terephthalate film of the present invention, fine particles of kaolin that have been crushed and classified by a conventional method are added to a polymer mainly composed of polyethylene terephthalate so as to satisfy the specific conditions of the present invention, and then the polymer is After melt-extruding into a sheet, the fine particles are dispersed on the surface of the film by biaxially stretching the film by a factor of 3 or more in the longitudinal and transverse directions.

The most preferable method for adding the fine particles is to disperse them in the form of a slurry in ethylene glycol and add them during the polymerization process, but they can also be added in the form of powder after polymerization and before molding, and dispersed in an extruder. good.

When adding kaolin fine particles, the particle size and amount added are
It is essential that the specific conditions of the invention are met.

That is, there are restrictions on the particle size from the viewpoint of workability, the difference between the front and back sides, the aesthetic appearance of the film, etc., and the average particle size (measured by the measuring method described later) is 0.2 to 3.0 μm, preferably 0.2 μm to 3.0 μm.
Must be 2-2.0μ.

If particles with an average particle diameter of less than 0.2 μm are used, workability including friction coefficient will not be sufficient.

On the other hand, if particles having an average particle diameter of more than 3 μm are used, not only the difference between the front and back surfaces becomes poor, but also the unevenness formed on the film surface becomes visible to the naked eye, which impairs the aesthetic appearance of the film, which is undesirable.

The amount added is 200 to 3,000 ppm, preferably 500 to 2,000 ppm from the viewpoint of transparency, workability, filter life, etc.
A range of 0.000 ppm is suitable.

If the amount added is less than 200 ppm, it will not be possible to prevent the occurrence of magnetic winding during slitting, while if it exceeds 3000 ppm, problems will occur in terms of filter life, production efficiency will decrease, and when made into a vapor deposited film. Scratches are more likely to occur.

Further, the product of the average particle diameter (μ) and the amount added (PPm) must be kept at 300 to 1500 in order to satisfy the requirements such as resistance to damage to metal surfaces, difference between the front and back surfaces, and coefficient of friction.

If this product is smaller than 300, the friction coefficient becomes thick (becomes 1
If it is larger than 500, the difference between the front and back will be significant and scratches will occur easily.

In addition, here, as a guideline for determining the extent of scratches, T1 and T2 measured according to the scratch measurement method described below are each 2.
．． It is sufficient if it is 0% or less and 2.5% or less.

When T1 and T2 become large, scratches on the metal surface become visible to the naked eye, degrading the quality of the final processed product.

As mentioned above, the polyethylene terephthalate film of the present invention has excellent properties such as good workability, little difference between the front and back sides, and resistance to scratches on the metal surface on which it is vapor-deposited. Suitable for applications such as

Next, the present invention will be explained in more detail using Examples.

The test method was as follows. Average particle size of particles: using microscopy.

The stretched film was photographed using a reflection method and the maximum diameter was measured.

Using this value, perform weight control conversion and obtain a cumulative weight fraction of 5.
The value at 0% was taken as the average particle size.

Friction coefficient: Improved to allow measurement with a tape-shaped sample according to ASTM1894-63.The sample was 15 mm wide and 150 mm long, and the measurement speed was 20 m711.
/min.

Film haze: Measurement was carried out using a turbidity meter NDH-2A manufactured by Nippon Heavy Industries in accordance with the method shown in ASTM D1003-59T.

Scratch: After placing the sample film on the A1 side of the aluminum vapor-deposited (500mm thick) film and applying a constant load, 20a
Slide the AI-deposited film at a speed of mlam.

Thereafter, the AI-deposited film was taken out and its total transmittance T was measured using a turbidity meter NDH-2A manufactured by Nippon Heavy Industries.

The total transmittance when the load is 30 ft/crA is T1, and 8
The value at 0fi/cm was defined as T2.

(If there is no scratch, both T1 and T2 will be 0.

) Difference between front and back; Two samples were lined up at the same time and placed in a vacuum evaporator to deposit AI, and then one was placed with the polyethylene terephthalate side facing up, and the other with the A1 side facing up, and visually judged.

The scores were divided into four ranks, A, B, C, and D, in descending order of quality, and scores of 8 or higher were considered to be passing.

Example 1 100 parts of dimethyl terephthalate, 75 parts of ethylene glycol and 75 parts of manganese acetate were charged into a transesterification tank, and the temperature was gradually raised to carry out the transesterification reaction, and the resulting methanol and excess ethylene glycol were distilled off.

Next, an ethylene glycol slurry of 0.03 parts of antimony trioxide and kaolin (manufactured by Engelnord, USA, classified from ASP) with an average particle size of 0.2 μm was added to the reaction mixture in an amount of 2000 ppm based on the polymerized polymer.
In addition, add 0.03 part of phosphorous acid so that it becomes 0.
A polymerization reaction was carried out at 280° C. for 4 hours under a reduced pressure of 5 mmHg.

The thus obtained polymer was extruded into a sheet through a die and stretched by 3.5 times in both the longitudinal and transverse directions at a temperature above the glass transition point to form a film with a thickness of 12 μm.

The friction coefficient, difference between the front and back sides, and AI of the obtained film
The ease with which the vapor-deposited surface was scratched was determined.

The results are shown in Table 1.

Examples 2 to 10 and Comparative Examples 1 to 7 Films were produced in the same manner as in Example 1, except that a predetermined amount of kaolin classified as ASP with different average particle diameters was added.

The measurement results of physical properties are also listed in Table 1. Example 11.12
Comparative Example 8 A film was produced in the same manner as in Example 1, except that the kaolin used was kaolin with an average particle size of 1 μm, which was obtained by classifying kaoprite manufactured by Thiele Kaolin Company, Inc. in the United States, and the addition was changed. did.

The measurement results of physical properties are also listed in Table 1. Comparative Examples 9 to 13 Instead of kaolin added in Example 1, talc (Hayashi Kasei, Micron White), aluminum hydroxide (Showa Denko, Heijirai, H-41), silica (Fuji Davison Chemical, Cycloid 266) ) and a-alumina (manufactured by Fujimi Abrasive Industries, WA-8000),
A film was produced in accordance with the method of Example 1, except that a predetermined amount of particles having the particle sizes shown in Table 1 was used.

The measurement results of physical properties are also listed in Table 1.

Claims (1)

[Claims] 1 Kaolin with an average particle size of 0.2 to 3-0μ is 200 to 3
A polyethylene terephthalate film for vapor deposition, characterized in that the product of the average particle diameter (μ) and the amount added (ppm) is from 300 to 500.