JPS60100914A - Producton of anti-cloud synthetic resin mirror - 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 (Technical Field) The present invention relates to a method for efficiently manufacturing a synthetic resin mirror with antifogging properties.

(Background technology) Mirrors, which are made of highly transparent synthetic resin films or sheets such as acrylic resin or polycarbonate resin with a metal vapor-deposited layer, are lighter and easier to process than inorganic glass, and are safer when damaged. Due to its high price, it is widely used in the field of mirrors. By the way, although this type of mirror has the above-mentioned advantages, it tends to fog up, and water droplets attached to it tend to impair the permeability of water. For this reason, it has been proposed to hydrophilize the surfaces of these synthetic resin mirrors, but it is difficult to achieve long-term effects using simple methods, and even if such methods are available, they are expensive. there were.

By the way, it is already known that antifogging properties can be exhibited by treating the surface of a synthetic resin to make it hydrophilic. For example, as seen in Japanese Unexamined Patent Publication No. 56-76454, there is a method in which the surface of an acetylcellulose resin is made hydrophilic with caustic soda or the like to exhibit antifogging properties. In this case, relatively thick sheets used for goggles etc. are stable in form and are therefore easy to undergo hydrophilic treatment, but in the case of thin films, there is a concern that wrinkles may occur, making it difficult to increase production efficiency. there were. By the way, such acetyl cellulose-based sheet material has a slight yellowish color, so if its thickness is increased, the transparency will not be affected, and the performance as a mirror will be degraded. For this purpose, it would be a good idea to bond a thin film of acetyl cellulose that has been treated to make it hydrophilic to another non-transparent base sheet and use this to make a mirror. There was a regret that it was not easy to manufacture because it was difficult to obtain thin film from processing plants.

(Objective of the Invention) The present invention aims to solve these problems.The acetylcellulose film to be hydrophilized is strongly bonded to a base material in advance and then hydrophilized, resulting in an excellent appearance. The purpose of the present invention is to efficiently produce an antifogging synthetic resin mirror.

(Structure of the Invention) The present invention aims to achieve the above object, and its gist is that a transparent acetylcellulose-based film TG heat-resistant An anti-fogging synthetic resin sheet material, which is bonded with an adhesive, then subjected to hydrophilic treatment on the surface of the transparent acetyl cellulose yarn film, and further formed with a metal vapor deposited layer and a protective layer on the opposite surface of the base material. It is in the manufacturing method.

The present invention will be described below with reference to drawings of embodiments.

In the figure, (1) is a base material made of a highly transparent synthetic resin film or sheet, and a film or sheet of acrylic resin, polycarbonate resin, polyester resin, etc. is used. The film or sheet at this time may be not only colorless and transparent but also colored and transparent. Further, (2) is a transparent acetyl cellulose film that is bonded and integrated with one side of the base material (1), and its thickness is about 002 to 01 scale. The base material (1) and the transparent acetyl cellulose film (2) are bonded by using a transparent heat-sensitive adhesive (3) such as polyvinyl acetate or its derivatives, polymethacrylate ester, or polyester. It is done. The joining method at this time is not particularly limited, but it is preferable to use a multistage press method.

Next, the surface of the transparent acetylcellulose film (2) of the bonded body bonded as described above is subjected to a gold hydrophilic treatment.
Treatment with an aqueous solution is used. After the treatment, the transparent acetyl cellulose film (2) U,
Since it is bonded to the base material (1), it is rigid and can be carried out efficiently without causing wrinkles or the like and causing the shape to deteriorate. Note that in FIG. 2, (4) shows the treated surface that has been subjected to hydrophilic treatment.

In the present invention, after the hydrophilic treatment as described above, a metal vapor deposited layer (5) and a protective layer (6) are formed on the opposite surface of the base material (1) to form a mirror. That is, the bonded body obtained as described above is loaded into a bell jar with the surface on the substrate (1) side facing the vapor deposition source, and vacuum vapor deposition is performed according to a predetermined method. Note that the vapor deposition source at this time is generally aluminum or copper. After the formation of the metal vapor deposition layer (5) is completed, a protective layer (6) is formed to protect this layer. This protective layer (6) is usually formed by spraying a protective paint.

(Example) Polyvinyl acetate adhesive was applied to one side of an acetyl cellulose film with a thickness of 0.07 wrrr to a thickness of about 0.01 wrrr.
It was applied so that it became dewy. Next, make this film to a thickness of 21
1111 for height and 300 for width. It was stacked on a transparent acrylic resin sheet and loaded into a press machine, and heated at a temperature of 150°C and a pressure of 100°C.
They were joined by hot pressing under the condition of kg7cm2.

Thereafter, the joined body was immersed in a 0.5% NaOH aqueous solution for 10 minutes, pulled up, washed with water, and then dried at 50° C. for 30 minutes.

Next, this bonded body was loaded into a bell jar with the surface of the acrylic resin sheet facing the aluminum vapor deposition source, and vapor deposition was performed while maintaining the degree of vacuum in the bell jar at 10-4 Torr.

``In order to confirm the antifogging properties of the obtained mirror, it was placed in a beaker containing hot water at 70°C with the acetyl cellulose film side facing down, and no fogging occurred. For comparison, when I placed a mirror that had not been made hydrophilic in the same way in a beaker, it fell apart after 2 seconds. The mirror acetylcellulose film obtained by this method was smoothly bonded to the base sheet and had a beautiful appearance.

(Effects of the Invention) Since the present invention has the configuration as described in detail above, it is possible to efficiently produce a synthetic resin mirror-like material with antifogging properties by a simple method, and the resulting synthetic resin Resin mirrors have the advantage of being beautiful and superior in appearance.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a cross-sectional view of a transparent cellulose film bonded to a base material, Fig. 2 is a cross-sectional view of a state in which it has been made hydrophilic, and Fig. 3 is a cross-sectional view of a transparent cellulose film bonded to a base material. FIG. 3 is a cross-sectional view of the anti-shrinking synthetic resin mirror obtained by the invention.

Claims (1)

[Claims] A transparent acetylcellulose thread film is bonded to one side of a base material made of a highly transparent synthetic resin film or sheet using a heat-sensitive adhesive, and then the surface of the transparent acetylcellulose film is subjected to a hydrophilic treatment, and then a VC base material is formed. 1. A method for producing an antifogging synthetic resin sheet, characterized in that a metal vapor deposited layer and a film-retaining layer are formed on opposite sides of the sheet.