JPS62282996A - Manufacture of base material for transfer - 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 3. Detailed Description of the Invention The present invention relates to a method for producing a transfer base material used for producing a metallized sheet by a transfer method.

The common method of adding metallic luster to sheets such as paper is to attach metal foil, but from a cost perspective,
It is more advantageous to apply metal powder or perform metal vapor deposition.

However, coating with gold pollen does not provide sufficient gloss, and even if aluminum is deposited directly on a surface with many irregularities, such as paper, similarly, only a gray deposited surface is obtained.

In order to obtain a vapor-deposited surface with excellent metallic luster, a method is adopted in which a resin or the like is applied to smooth the paper surface to such an extent that no trace of the unevenness remains, and then the metal is spread. However, this method is also disadvantageous in terms of cost.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. 52-124912, a method has been proposed in which a film supporting member having a smooth surface, such as a polypropylene film, is once coated with a metal base, and then this vapor-deposited film is transferred to a layer, etc. has been done.

One of the most important technical issues in this method is how to uniformly form a metal film on the surface of the coating support member, and the other problem is how to form an extremely thin metal film on the surface of the film support member. The problem is how to smoothly separate the film from the film support member and transfer it to paper or the like without breaking the film.

In order to solve the above-mentioned problems, the present applicant has previously proposed a film support member that is aged under specific conditions. (Unexamined Japanese Patent Publication No. 54-44783)
However, as a result of further research, Inventor et al. found that good results could be obtained under conditions other than those described in the above application.

Hereinafter, the configuration of the present invention will be explained based on the accompanying drawings.

As shown in the circular, molten polypropylene is extruded into a film form from the T-die 2 of the extruder 1, passed through a mirror-finished cooling roll 3 to smooth the surface, and then stretched by a normal stretching method, such as a preheated roll. The film is preheated with a roller 6, stretched in the longitudinal direction with a stretching roll 7, and cooled with a cooling roll 8. Thereafter, it is further preheated in the preheating section 9 and stretched in the lateral direction in the lateral stretching section 10. Next, heat treatment section 1 is carried out to achieve crystallization.
After the heat treatment in step 1, cooling is performed in cooling section 12.

The surface of the film obtained through the above treatment is subjected to corona discharge treatment to form a film support member A.

In the figure, 4 is a corona discharge electrode, and 5 is a coil around which support member A is wound. Here, in order to form a glossy deposited film during transfer, or to obtain uniform bleed, uniform crystallization, and uniform wettability on the surface of the support member due to the configuration described later, a mirror-finished cooling roll is used. It is desirable to subject the smoothed film surface to a corona discharge treatment.

Now, the above corona discharge treatment is performed to adjust the surface wettability of the support member A. As a result of experiments, this wettability is
It has been found that between 31 and 35 dynes/cm is best. If it is less than 31 dynes/an, the adhesion of metal particles during vapor deposition will be poor (and a uniform deposited film cannot be formed), and if it exceeds 35 dynes/■, the adhesion to the film support member will be too strong. This is because the vapor deposited film cannot be peeled off smoothly during transfer, resulting in poor workability.

Using the film support member treated as described above, the surface is subjected to metal deposition in a normal process, and then further heated at room temperature to
A good transfer substrate can be obtained by aging at a temperature of 60° C. for 10 hours or more but less than 72 hours. In other words, not only the crystallization of the film support member progresses more, but also the stabilizer, lubricant, etc. contained in the polypropylene, which is the raw material of the support member, bleeds out better on the surface of the film support member on which the 7 deposits are formed. This is because it can infiltrate the surface and allow the vapor deposited film to be peeled off smoothly.

There is a correlation between the temperature and time of this configuration process; if the temperature is low, it will take a long time, and if the temperature is low, it will take a short time.
If the temperature is too high, heating will cause deformation and shrinkage of the film support member, while if the temperature is too low, it will take a long time to form, and the crystallinity of the resin will not progress sufficiently, resulting in poor strength. Therefore, the temperature and time ranges described above are preferred.

Using the film supporting member subjected to the above treatment, an adhesive is applied to the surface of the metal vapor-deposited film, and the film is bonded to, for example, paper by pressure bonding.
Further, when only the film support member is separated, the above-mentioned film is transferred to the surface. At this time, the deposited film is smoothly separated from the supporting member by Ml+ without any breakage or the like. Therefore,
Such a film support member can be provided on the market as an extremely useful transfer base material.

Examples are given below.

〔Example〕

Surface wettability of 20μ thick polypropylene film 32
After adjusting to ~33 dynes/cm, this surface was coated with metal and incubated at room temperature for 70 hours and at 60°C for X0 hours, respectively.

When the vapor-deposited film of the transfer base material was transferred to the paper using an adhesive, the vapor-deposited film peeled off smoothly from the polypropylene film, and a glossy aluminum widely deposited film was transferred to the paper surface. Ta.

As described above, according to the present invention, a transfer base material with excellent characteristics can be obtained in a short time.

[Brief explanation of the drawing]

The figure is a diagram showing the manufacturing process of this invention.

Claims (1)

[Claims] The surface wettability of the polypropylene film was adjusted to 31 to 35 dynes/cm by corona discharge treatment, a metal vapor deposition film was formed on the surface, and then the wettability of the polypropylene film was adjusted to 31 to 35 dynes/cm.
A method for producing a transfer substrate, which comprises aging for at least 1 hour and less than 72 hours.