JPS6151335A - Transparent synthetic resin body having permeability resistance - 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] (Industrial application field) Final F! J4 relates to a synthetic resin body having moisture permeability resistance.

(Prior art) Moisture-resistant transparent TJ and S resins have been used to prevent the contents from deteriorating in the packaging of foods, medicines, and chemical products, and to protect KL elements in the electronics field. body is used.

For example, a polyester film in which metal aluminum is vapor-deposited is proposed in Japanese Patent Application No. 11-1144831). Can only be used for limited purposes. In addition, in Japanese Patent Publication No. 53-12953, the glass film 1c
Although it has been proposed to maintain transparency by providing a sixoy thin film layer, the moisture permeability resistance was insufficient.

(Problems to be Solved by the Invention) The present invention has been made for the purpose of eliminating the above-mentioned conventional drawbacks, and providing a transparent synthetic resin body that does not impair transparency and has extremely good moisture permeability resistance. It is.

(Summary of the Invention) In the present invention, transparent synthetic resin bodies such as polyvinyl chloride, polystyrene, polyester, polyvinyl butyral, polyethylene, polypropylene, polyamide, hexaronone, etc. are used as the transparent synthetic resin body of the base material. Ru.

Furthermore, the transparent synthetic resin body is a flexible film-shaped body, which is convenient for use in packaging or lamination. However, the present invention is not limited to those in which the base material is a film-like body; : It is applied to synthetic resin molded products such as mirrors, plates, and lens bodies, and can prevent deterioration, deterioration, and deformation of the synthetic resin body due to moisture absorption.

The film-like transparent synthetic resin body preferably has a flexibility of 5 to 300 μm, and more preferably has a thickness of 5 to 100 μm.

KTfi, which deposits oxides and compounds on a film-like transparent synthetic resin body, usually requires a winding crab through a cooling roll, but the thickness of the film-like transparent synthetic resin body is 5.
When the thickness is less than μm, wrinkles and cracks are likely to occur, and when the thickness exceeds 300 μm, the flexibility becomes poor and continuous winding becomes difficult.

A transparent thin film layer is formed on at least one side of the transparent synthetic resin body. The transparent thin film layer is P2Os, A I20m.

Mρ (M represents Group Ia elements of the periodic table such as Na, K, and Rb) is the molar ratio, (P, 0.) : (A It'
s): (Mto)=2-8:2-5:1-3.

When the molar ratio of the transparent thin film layer is out of the above range, phase separation tends to occur and moisture resistance decreases. The above composition contains impurities such as PbO, Sion, and Boo.

If the oxide Fis weight% or less, no extreme deterioration in moisture permeability is observed, and when producing the transparent synthetic resin body having moisture permeability resistance of the present invention, it is possible to keep impurities within the above range. desirable.

A method for forming a transparent thin film made of an oxide having the above composition may be a known method such as a vacuum evaporation method, an ion blasting method, or a sputtering method. The formation method will be explained in detail below.

The most preferable method for forming the above oxidized frame assembly all on a plastic substrate is sputtering6. By using the sputtering target with the above composition, an amorphous transparent thin film layer having almost the same composition can be formed.

Further, a transparent thin film layer having the above composition can also be formed by a vacuum evaporation method or an ion blating method. In the case of vacuum evaporation, it is said that it is difficult to form a thin film layer using mixed substances having different vapor pressures with the same composition. However, the present inventors have confirmed that a deposited film having approximately the same composition can be obtained by melting and solidifying the above composition in advance in an electric furnace and using it as an evaporator and evaporating it using an electron gun heating method. .

Further, a vapor deposited film having the above composition can also be formed by a flash vapor deposition method which is generally used when vacuum vapor depositing a mixture.

In the present invention, the adhesiveness of the transparent thin film layer to the transparent synthetic resin body of the base material is good, and the transparency is also good, regardless of whether the vacuum evaporation method, ion, blating method, or sputtering method is used. Another feature of the present invention is that curling does not pose a major problem in a film-like transparent synthetic resin body in which a transparent thin film layer is formed by a vacuum evaporation method or the like. Compared to the conventional Si xoy, this invention (P, O,, A,
1*0. , M2O), this is probably because the residual stress in the transparent thin film layer is small.

Forming a transparent thin film layer by vacuum evaporation method or ion blating method is usually carried out in a vacuum atmosphere of 2 X 10-'' torr or less, but in order to avoid deterioration of performance due to contamination of impurities, K is set to I X 10. It is preferable to carry out the process under a vacuum atmosphere of less than 'torr.

In order to have good flexibility and adhesion, the transparent thin film layer preferably has a thickness in the range of Q01μm = a 5μm, and j! It is preferable that the violet is in the range of #1 aos to a3 μm. The thickness of the transparent thin film layer must be at least a01 μm, since a uniform continuous film cannot be formed unless the thickness is at least a01 μm. Furthermore, if the film thickness exceeds 5 μm, the transparency will not be impaired, but curling of the film-like transparent synthetic resin body may become a problem, and the transparent film may be prone to cracking or peeling.

(Function) When the permeation-resistant and durable synthetic resin body of the present invention is used as a packaging body, it is desirable to impart heat sealability to the body. In that case, (PgOs, A It's, M!0-)
By laminating a synthetic resin film having heat sealability on a transparent thin film layer made of the system, heat sealability can be imparted to the transparent synthetic resin body having moisture permeability resistance of the present invention.

Examples of the synthetic resin film having heat-sealing properties include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-based ionomer, etc., which do not compromise transparency.

To laminate synthetic resin films having heat-sealing properties, there are two methods: using an adhesive (dry lamination method), and melt-extruding a synthetic resin into a film and pressing it onto a base material (extrusion lamination method).

In the dry lamination method, the adhesive used varies depending on the synthetic resin film, but incyanate-based adhesives are generally used.

In the extrusion lamination method, (P snow O
s, A1m's, M2O) system, the anchoring effect is expressed in the transparent thin film layer, which eliminates the need for the usual anchoring treatment with organic titanate-based, inocyanate-based, or polyethyleneimine-based anchoring agents. . Therefore, there is no need to use conventional organic solvents,
There will be no deterioration of the manufacturing work environment, and no organic solvents will remain in the product.

(Example) Examples of the present invention are shown below.

<Example 1> A mixture of oxides with a molar ratio of PgOs, Altri, and Nago of 5:3:2 was melted and solidified in an electric furnace, and then heated and evaporated using an electron gun heating method under a vacuum of 5 x 10 torr. and polyethylene terephthalate (P
A transparent thin film layer with a thickness of α1 μm was formed on a film (15 μm thick). The thickness of the transparent thin film layer was measured using a crystal oscillation type monitor. The composition of the transparent thin film layer was analyzed using an X-ray microphone analyzer and was found to be approximately the same as the composition of the initial mixture.

Adhesion of the formed transparent thin film layer JIS D 02
I checked it on 02 and found it to be very good.

Furthermore, the light transmittance of the film on which the transparent thin film layer was formed was approximately the same as that of the undeposited film, and the transparency was good.

Moisture permeability is at 40°C and relative humidity 9096RH.

It was measured using JIS Z 0208 (gravimetric method using a cup) and a hygrometer method, and both values were approximately the same.

<Example 2> In Example 1, the thickness of the transparent thin film layer was set to α2 μm.

<Example 3.4> Example 1.20 A biaxially oriented polypropylene (OFF) film (25 μm thick) was used in place of the PET film.

<Examples 5 to 10> In place of the mixture composition of Example 1, the composition shown in the table was used to form a transparent thin film layer.◇ Comparative Examples 1 to 4
> Instead of the mixture composition of Example 1, a mixture having a molar ratio outside the range of the present invention was used to form a transparent thin film layer.

Comparative Example 5.6> A transparent thin film layer was formed using S2O and sio, which are conventionally known to form a moisture permeable transparent thin film layer.

Comparative Example 7 A thin A1 layer, which is opaque but is said to have good moisture permeability, was formed on a PET film.

(The following is a blank space) (Effects of the invention) As detailed above, the transparent synthetic resin body having permeation and mixing resistance of the present invention can obtain extremely good moisture permeation resistance that has not been obtained conventionally, without impairing transparency. It can be used as a package for food or medicine, or as a protector for EL elements.

Claims (1)

[Claims] 1. P_2O_5 on at least one side of the transparent synthetic resin body.
, Al_2O_3, M_2O (M represents an element of group Ia of the periodic table such as Na, K, Rb, etc.) in molar ratio, (P_
2O_5):(Al_2O_3):(M_2O)=2~
A transparent synthetic resin body having moisture permeability resistance, characterized in that a transparent thin film layer of a composition having a ratio of 8:2 to 5:1 to 3 is formed. 2. The transparent synthetic resin body is a flexible film-like body with a thickness of 5 to 300 μm, and the transparent thin film layer has a thickness of 0.01 to 300 μm.
A transparent synthetic resin body having moisture permeability resistance according to claim 1, which has a moisture permeability of 0.5 μm. 3. A transparent synthetic resin body having moisture permeability resistance according to claim 1 or 2, wherein the transparent thin film layer is formed by a vacuum deposition method, an ion plating method, or a sputtering method.