JPS60101042A - Manufacture of non-fogging synthetic resin sheet-shaped article - 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 (1'!v Technological Field) The present invention relates to a method for efficiently producing a synthetic resin sheet having antifogging properties.

In the present invention, the synthetic resin sheet includes anything from a thin film-like material to a sheet-like material.

(Background technology) Highly transparent synthetic resin films and sheets such as acrylic resin and polycarbonate resin are lighter and easier to process than inorganic glass, and are more secure when broken, so they are used for gratings and various other purposes. Used for lighting materials, etc. By the way, although this type of film or sheet has the above-mentioned advantages, it tends to become cloudy and has a tendency to accumulate water droplets, which impairs light transmittance. For this reason, it has been proposed to make the surface of these synthetic resin sheets hydrophilic.
It is difficult to achieve long-term effects using simple methods, and even if such methods were available, they were expensive.

For example, as seen in JP-A-56-76454, it is known that the surface of an acetylcellulose resin is treated to be hydrophilic with caustic soda or the like to exhibit antifogging properties. In this case, the relatively thick sheet used for goggles etc.
Since it is morphologically stable, it is easy to perform hydrophilic treatment, but if it is in the form of a thin film, there is a concern that wrinkles may occur, making it difficult to increase production efficiency. However, since such acetyl cellulose-based sheet material has a slight yellowish color, increasing its thickness will affect transparency, and therefore it cannot be used for some purposes. For this purpose, it is either a matter of joining a thin film of acetyl cellulose yarn that has been treated to make it hydrophilic to another highly transparent base sheet, or it is difficult to obtain a thin film that has been treated as described above. I was extremely disappointed that it was so easy to manufacture.

(Objective of the Invention) The present invention aims to solve the problems of Konoshi and others, and the acetyl cellulose yarn film to be hydrophilized is strongly bonded to a base material in advance and then hydrophilized, and the appearance is improved. It is an object of the present invention to efficiently produce a synthetic resin sheet with excellent antifogging properties.

(Structure of the Invention) The present invention aims to achieve the above object, and its gist is to attach a transparent acetyl cellulose film to a substrate made of a highly transparent synthetic resin film or sheet by heat-sensitive adhesive. A method for producing an anti-fogging synthetic resin 7 nitrate, which comprises bonding the transparent acetyl cellulose film with a tube, and then subjecting the surface of the transparent acetyl cellulose film to a hydrophilic treatment.

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/and at this time may be colored and transparent instead of being colorless and transparent. Also (2
) is a transparent acenal cellulose film that is bonded and integrated with at least one surface of the base material (1), and has a thickness of approximately 0.02 to 0.1 mm. This a
Material (1) Transparent acetyl cellulose film (2
), polyvinyl acetate or its conductor,
This is carried out by completely interposing a transparent thread heat-sensitive adhesive (3) such as polymethacrylic acid ester type or polyester type. 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 acetyl cellulose film (2) of the bonded body bonded as described above is subjected to a hydrophilic treatment, and the hydrophilic treatment at this time is usually performed using NaO.
Treatment with an H aqueous solution is employed. After the treatment, the transparent acetyl cellulose film (2) is bonded to the base material (1) during these hydrophilic treatment steps, so it is rigid and wrinkles may occur. It can be done efficiently without losing shape. In addition, in FIG. 2, (4) shows the treated surface that has been subjected to hydrophilic treatment.

(Example) A polyvinyl acetate adhesive was applied to one side of an acetylcellulose film of NOSO, OY to a thickness of about 0.01 m. Next, this film is made vertically with a thickness of 2
It was stacked on a transparent acrylic resin sheet with 500 horizontal fins and loaded into a press, at a temperature of 150°C and a pressure of 100 kg/clr.
They were joined by hot pressing under the condition of 1".

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.

In order to confirm the rust prevention properties of the obtained sheet, it was placed on a beaker containing hot water at 70° C. with the acetyl cellulose film side facing down, and no clouding occurred. For comparison, when a sheet that had not been treated to make it hydrophilic was placed in a beaker in the same way, it broke off after 2 seconds. Note that the acetyl cellulose film of the sheet 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 sheet material having antifogging properties by a simple method, and the resulting synthetic resin sheet can be easily produced. Resin sheet-like products have the advantage of being beautiful and superior in appearance.

[Brief explanation of the drawing]

The drawing shows an example of Akira Motomoto's work. Figure 1 shows a halo with transparent cellulose yarn attached! FIG. 2 is a 1-nano cross-sectional view of the anti-adhesion synthetic tree uw/-t-shaped material obtained according to the present invention. (1n...7shi(IJ, <2)...No cliff ψJ acetyl cellulose thread film,
ni; Fu...I'm impressed ↓Note cherry blossom adhesive, (4)...
・Processing surface Qin l Figure ice 2 (27

Claims (1)

[Claims] An antifogging method characterized by bonding a transparent acetylcellulose thread film to a base material made of a highly transparent synthetic resin film or sheet using a heat-sensitive adhesive, and then subjecting the surface of the transparent acetylcellulose thread film to a hydrophilic treatment. A method for producing a synthetic resin sheet.