JP2000327818A - Method for making functional film and method for attaching functional film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for making a functional film whereby panel glass can be re-used along with cost saving of a cathode ray tube. SOLUTION: The functional film has a resin film 11 having a functional film laminated on one surface thereof, an anti-reflecting film 14 having, as a functional film, an SiO2 layer in a skin portion, and a stain-resistant film 15 just on the anti-reflecting film 14 and serving as an outermost layer of the resin film 11. A coating solution for the stain-resistant film is prepared by adding, as a catalyst, a phosphate ester containing a perfluoro group to a solution having a perfluoro group-containing silicon material as a solute. The resultant coating solution is coated onto the anti-reflecting film 14, followed by drying to form the stain-resistant film 15. The coating solution is so prepared as to comprise 0.2 pts.wt. of the solute and 7.0 pts.wt. to 10.0 pts.wt., preferably 7.0 pts.wt. to 8.0 pts.wt., of the catalyst relative to the weight of the solute.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention mainly relates to a cathode ray tube (C)
The present invention relates to a method for producing a functional film adhered to the surface of a panel glass (RT), and a method for attaching such a functional film.

[0002]

2. Description of the Related Art Generally, in a display device such as a cathode ray tube (CRT), a functional film is provided on the surface of a panel surface on which an image is displayed via an adhesive such as an ultraviolet curable resin or an adhesive. It is stuck.

[0003] The functional film is a resin film having a base material by appropriately combining films having various functions such as an explosion-proof auxiliary effect, an antistatic effect, a transmittance adjusting effect, an antireflection effect, and an antifouling effect. As an example, there is known a resin film formed by laminating a hard coat film, a transparent conductive film, an antireflection film, and an antifouling film on a resin film in this order.

Here, the antifouling film is made of a fluorine-based resin in which dirt such as fingerprints does not easily adhere to the surface thereof, and the dirt once adhered can be easily removed by dry wiping or water wiping. A coating agent formed by adding a perfluoro group-containing phosphoric acid ester as a catalyst to a solution containing a perfluoro group-containing silicon-based material as a solute is coated on an antireflection film, and further dried. It is formed by doing.

[0005] A functional film obtained by forming a hard coat film, a transparent conductive film, an antireflection film, and an antifouling film on a resin film as described above is formed into a roll immediately after the formation of the outermost antifouling film. It is wound up and stored, pulled out of the roll at the time of use, and adhered to an adhered surface, for example, a panel glass surface of a CRT, via an adhesive (ultraviolet curable resin) or an adhesive.

As a method of attaching such a functional film to the surface of the panel glass, first, as shown in FIG. 8, an ultraviolet curable resin 2 is applied to the surface of the panel glass 1.
Next, the functional film 3 is held at one end by a film gripper 4.
The other end is placed on the UV-curable resin 2 while being held above the UV-curable resin 2. Then, while moving the pressure roll 5 from the other end toward the one end side on the functional film 3, the film gripper 4 is lowered and one end side is also gradually brought into contact with the ultraviolet-curable resin 2, thereby obtaining the functional film 3. 3 is placed on the UV-curable resin 2. Thereafter, ultraviolet rays are irradiated from above the functional film 3 to cure the ultraviolet-curable resin 2, whereby the functional film 3 is attached to the panel glass 1.

[0007]

In the case of the above-mentioned functional film, particularly when it is adhered to the surface of a panel glass using an adhesive, for example, the obtained CRT is recycled as a product after shipment. When the functional film is peeled off for processing, the adhesive remains on the surface of the panel glass, and it becomes difficult to reuse the adhesive. If the reuse becomes difficult in this way, there arises an inconvenience that the cost of a cathode ray tube using this functional film is increased.

When the functional film is adhered to the panel glass surface with an adhesive made of an ultraviolet-curable resin (hereinafter, referred to as an ultraviolet-curable resin), for example, if the adhered surface is contaminated, the functional film is irradiated with ultraviolet light. Therefore, even when the ultraviolet curable resin is cured, the functional film is easily peeled off from the panel glass surface. Then, when the functional film is peeled off, a step of re-adhering the functional film becomes necessary, and as a result, as in the case described above, the cost of the cathode ray tube using this functional film increases. Such inconveniences are caused.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a functional film in which panel glass can be reused to reduce the cost of a cathode ray tube, and a method for manufacturing a functional film from panel glass. An object of the present invention is to provide a method for attaching a functional film, which prevents peeling and reduces the cost of a cathode ray tube.

[0010]

The inventor of the present invention has made intensive studies on the fact that the adhesive remains on the surface of the panel glass. As a result, the cause is that the functional film is wound up in a roll and stored. It was concluded that a part of the antifouling film was transferred to the resin film surface of the functional film (the surface opposite to the surface on which the antireflection film and the antifouling film were formed). Was.

That is, since the antifouling film is difficult to adhere to the dirt and the like, if the antifouling film is set off to the resin film surface which is in contact with the adhesive, the set off portion is also prevented. It acts in the same way as a soil film, so that the adhesiveness with the adhesive becomes weak. Therefore, when the functional film is peeled off, the adhesive remains on the panel glass side instead of the resin film.

Therefore, in the method for producing a functional film according to the present invention, a functional film is laminated on one surface of a resin film, and as the functional film, an antireflection film having a SiO ₂ layer on a surface layer portion is provided. In producing a functional film having at least an antifouling film formed directly on the antireflection film and serving as an outermost layer of the resin film, a silicon-based material containing a perfluoro group is used as a solute. To the solution, a phosphoric acid ester containing a perfluoro group is added as a catalyst to form a coating agent for the antifouling film, and the obtained coating agent is applied on the antireflection film, and further dried. When the antifouling film is formed, the coating agent is 0.2 parts by weight of the solute, whereas the catalyst is 7.0 parts by weight or more and 10.0 parts by weight or less based on the weight of the solute. Preferably 2.0 parts by weight or more, the preparation as a 8.0 parts by weight or less of the range was solutions of the problems.

According to this method for producing a functional film, by setting the concentration of the catalyst in the above range, the reaction between the silicon-based material as a solute and the SiO ₂ layer on the surface layer of the anti-reflection film is promoted, whereby The adhesion between the antifouling film and the antireflection film formed from the material is enhanced.

Further, as a result of diligent research on the above-mentioned easy peeling of the functional film, it was concluded that the cause was as follows. That is, when viewed microscopically, as shown in FIG.
Irregularities are formed on the back surface (resin film surface), and as described above, when the functional film 3 has a set-off or has contamination or the like, the irregularities become larger. On the other hand, the ultraviolet curable resin 2 applied on the surface of the panel glass 1 has a high viscosity (viscosity) because the panel glass 1 is usually left at room temperature when applied on the surface of the panel glass 1. Therefore, even if the functional film 3 is placed on it and pushed by the pressure roll 5, the UV-curable resin 2 having high viscosity and low fluidity cannot sufficiently follow the back surface shape of the functional film 3.

When the ultraviolet-curable resin 2 cannot follow the shape of the back surface of the functional film 3 as described above, as a result, there are minute holes 6 on the order of μm between the ultraviolet-curable resin 2 and the functional film 3. Are formed, whereby the adhesion between the ultraviolet curable resin 2 and the functional film 3 is reduced, and the functional film 3 is easily peeled off.

Therefore, in the method for attaching a film according to the present invention, an ultraviolet curable resin is applied to the outer surface of the panel glass of the cathode ray tube, and then a functional film is placed on the ultraviolet curable resin. When the curable resin is irradiated with ultraviolet light to cure it, and when the functional film is attached to the panel glass, prior to applying the ultraviolet curable resin to the outer surface of the panel glass, a resin-coated surface of the panel glass is used. Is heated to a temperature higher than room temperature, preferably in the range of 30 ° C. or more and 45 ° C. or less, as a means for solving the above-mentioned problem.

According to this method for attaching a film, the resin-coated surface of the panel glass is heated in advance to a temperature higher than room temperature. As the temperature rises, its viscosity decreases and its fluidity increases. Therefore,
If a functional film is placed on the ultraviolet-curable resin and pushed with a pressure roll, the ultraviolet-curable resin sufficiently follows the shape of the back surface of the functional film 3.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an example of a method for producing a functional film of the present invention will be described. FIG. 1 is a diagram showing an example of a functional film manufactured according to the present invention.
Reference numeral 10 denotes a functional film. This functional film 1
Reference numeral 0 denotes a known structure in which a hard coat film 12, an antireflection film (including a transparent conductive film) 14, and an antifouling film 15 are laminated in this order on a resin film 11 as a functional film. Is adhered to the surface of the panel glass 1 through an adhesive 7 and used. As shown in FIG. 1, the functional film 10 has the surface of the resin film 11 adhered to the surface of the panel glass 1, and the antifouling layer 15 is located at the outermost layer. ing.

In order to manufacture such a functional film 10, first, a hard coat film 12 and an antireflection film (including a transparent conductive film) 14 are formed on one surface of a resin film 11 in this order in a conventional manner. Form. The anti-reflection film 14
Is provided so that reflection of external light can be reduced and a preferable image can be displayed, and is formed by a multilayer optical thin film in which thin film materials having different refractive indexes are alternately stacked. Here, the anti-reflection film 14 is configured such that the SiO ₂ layer is located on the surface portion thereof.

Next, as shown in FIG. 2, a pair of rollers 1 on a coating tank 17 in which a coating agent 16 is stored,
The coating agent 16 is applied by passing between 8a and 18b,
Subsequently, the coating agent 16 applied by passing the resin film 11 through a dryer 19 is dried to form an antifouling film 15 made of a fluororesin. Thereafter, the functional film 10 manufactured by forming the antifouling film 15 is taken out of the dryer 19, wound up in a roll shape, and stored until used.

The roller 18a is made of a chrome-plated metal roll, the roller 18b is made of rubber or soft resin, and the lower roller 18a is arranged with its lower part immersed in the coating agent 16. Accordingly, the coating agent 16 is applied to the lower surface (the surface on which the antireflection film 14 is formed) of the resin film 11 passed therethrough.

Here, the coating agent 16 is prepared by adding a perfluoro group-containing solution [RfSi (OEt) ₃ : Rf is a perfluoro group and Et is an ethyl group] containing a silicon-based material as a solute. [(H ₂ RfPO ₄ ): Rf is a perfluoro group] and is formed by adding a phosphoric acid ester as a catalyst. In particular, the solute contains 0.2 parts by weight (for example, the entire coating agent 16). Of the catalyst is 7.0 parts by weight (for example, 7.0% by weight based on the solute weight) or more and 10.0 parts by weight (for example, 1 part by weight based on the solute weight).
0.0 wt%) or less, preferably 7.0 wt% (for example, 7.0 wt% based on solute weight) or more and 8.0 wt% (for example, 8.0 wt% based on solute weight). Prepare to be in the range. The drying temperature of the dryer 19 is about 60 to 66 ° C., preferably about 66 ° C.
Set to ° C.

After the coating agent 16 is thus prepared and the antifouling film 15 is formed, the silicon-based material as a solute and the Si on the surface layer of the antireflection film 14 are formed by the action of a catalyst.
The reaction with the O ₂ layer can be promoted, whereby the adhesion between the antifouling film 15 formed of a solute and the antireflection film 14 can be enhanced.

(Experimental Example) In order to confirm the adhesion (adhesion strength) between the antifouling film 15 and the antireflection film 14, the catalyst concentration of the coating agent and the drying temperature were changed as shown in the following table. Prepare samples A to E (functional films)
After being stored on a reel for a predetermined number of days, the back contact angle (wetting property), back fluorine (F) amount, adhesive strength, and liquid pan life of the coating agent of the functional film were examined.

The liquid pan life, that is, the service life of the coating agent, is such that after applying the coating agent on the antireflection film, an alcohol wipe test is performed and the antifouling film is peeled off (reduction in contact angle). You can do this by checking Therefore, assuming a case of continuous use for 8 hours, the coating agent is put into the coating tank 17 and the roll 18a is rotated, and the contact angle on the surface of the antifouling film made of the coating agent applied every hour is determined. The liquid pan life was measured by measuring and further performing IR spectrum measurement.

[Table 1]

From the results shown in the table, the catalyst concentration was 5% by weight.
In the cases of A and B, the adhesive strength did not exceed the preset reference strength, and the amount of the back surface F was large as shown in the table and FIG. Was. On the other hand, in C, D, and E where the catalyst concentration was 7% by weight to 10% by weight, the adhesive strength exceeded the reference strength, the amount of the back surface F was small, and the set-off was small. The functional film judged as good (OK) was stored for one month in a state of being wound in a roll, and then the adhesion strength was examined again.
K), and it was confirmed that there was no change with time.

As for the liquid pan life, that is, the service life of the coating agent, it is natural that a longer one is more advantageous for the production, and it is better that it is 3 hours or more, more preferably about 5 hours. 0 parts by weight (7.0% by weight) or more and 8.0 parts by weight (desirably lower. Further, when comparing A and B, B having a higher drying temperature of 66 ° C. has a higher drying temperature. The amount of the back surface F was smaller than that of A where the temperature was 60 ° C., and thus it was found that increasing the drying temperature to about 66 ° C. was effective in preventing set-off.

In this method for producing a functional film,
By setting the concentration of the catalyst in the above range, the reaction between the silicon-based material as the solute and the SiO ₂ layer of the surface layer of the anti-reflection film 14 is promoted, and the anti-fouling film 15 and the anti-reflection film 14 formed from the solute are Can improve the adhesive strength, so that set-off when rolled up in a roll can be prevented. Therefore, by preventing the set-off in this way, it is possible to sufficiently secure the adhesiveness between the back surface of the functional film 10 (the surface of the resin film 11) and the pressure-sensitive adhesive. When the functional film 10 is peeled from the panel glass, the adhesive is peeled off with the adhesive adhered to the functional film 10 side without remaining on the panel glass side, so that the panel glass can be reused.

Next, an example of the method for attaching a functional film of the present invention will be described. In this example, the functional film 10 shown in FIG. 1 is used as the functional film. First, as shown in FIG. 4A, a phosphor screen (not shown) is formed on the inner surface of the panel glass 21, and after attaching an aperture grill (not shown), it is joined to a funnel glass 22 to form a cathode ray tube (CRT). 20 is produced. And
The surface of the panel glass 21 of the cathode ray tube 20 is washed with a cleaning liquid,
It is sequentially washed with pure water and an alcohol solvent, and then dried.

Next, as shown in FIG. 4B, a heating source 23 such as a heater or a lamp is used, and the surface of the panel glass 21 which is to be coated with the ultraviolet curing resin is heated by the heating source 23. This is heated to a temperature higher than room temperature, preferably 30 ° C. or more and 45 ° C. or less.

Next, as shown in FIG. 4C, an ultraviolet-curable resin 23 is applied to the heated surface of the panel glass 21 by a roll coating method, a bar coating method, or the like. Here, regarding the application of the ultraviolet curable resin, instead of applying the resin uniformly over the entire surface, resin lines are formed in a plurality of rows with a predetermined gap therebetween, and these lines are formed by a pressure roll described later. Is formed along the traveling direction. When the ultraviolet-curable resin 23 is applied in this manner, the applied surface of the panel glass 21 is heated to a temperature higher than room temperature, and the viscosity of the applied ultraviolet-curable resin 23 is reduced by increasing the temperature. And the fluidity increases. The UV-curable resin used in this example is
As shown in FIG. 5, the viscosity decreases as the temperature increases. For example, the viscosity is 1580 cps at 25 ° C., which is a normal temperature, and is 610 cps at 35 ° C.

Next, as shown in FIG. 4D, the functional film 10 is placed on the ultraviolet curing resin 23, and one end thereof is gripped by a film gripper (not shown) in the same manner as shown in FIG. While applying pressure from above on the pressure roll 24,
The lower ultraviolet curable resin 23 is pushed out to make its thickness uniform to a predetermined thickness. At this time, as described above, since the ultraviolet curable resin 23 has a low viscosity and a high fluidity, the pressure roll 24 is interposed via the functional film 10.
6, the ultraviolet curable resin 23 sufficiently follows the shape of the back surface of the functional film 10 as shown in FIG. 6, and no pores are formed between the functional film 10 and the ultraviolet curable resin 23. In addition, as the pressure roll 24, a metal roll, a hard rubber roll, a rubber lining metal roll, or the like is used.

Thereafter, as shown in FIG. 4 (e), an ultraviolet ray is applied to the ultraviolet curable resin 23 from above the functional film 10 using the ultraviolet light source 25, and the resin is cured to place the functional film 10 on the panel glass 21. Stick it on here,
As the ultraviolet irradiation light source 25, a metal halide lamp,
A high-pressure mercury lamp, a xenon lamp, or the like is used.

As described above, when the resin-coated surface of the panel glass 21 is previously heated to a temperature higher than room temperature, the UV-curable resin 23 is applied, and the functional film 10 is adhered, the UV-curable resin 23 is 6, the pores are not formed between the functional film 10 and the ultraviolet curable resin 23 as shown in FIG. 6, so that the adhesive strength of the functional film 10 to the panel glass 21 is increased. Accordingly, it is possible to prevent the functional film 10 from peeling off from the panel glass.

(Experimental example) Without heating the surface of the panel glass 21, the surface of the panel glass 21 is kept at room temperature (about 25 ° C. to 28 ° C.), and the ultraviolet curable resin 23 is applied.
Is applied (conventional example), and after the surface of the panel glass 21 is heated from about 30 ° C. to 40 ° C., the ultraviolet curable resin 23
Was applied, and the adhesive strength of the functional film 10 was examined for each case where the functional film 10 was adhered (Example of the present invention). FIG. 7 shows the obtained results. From the results shown in FIG. 7, the example of the present invention in which the UV curable resin 23 was applied after heating the surface of the panel glass 21 was clearly bonded compared to the conventional example in which the UV curable resin 23 was applied at room temperature. It was confirmed that the strength was high.

[0036]

As described above, according to the method for producing a functional film of the present invention, the catalyst concentration in the coating agent for forming an antifouling film is adjusted to 7.0 parts by weight or more with respect to 0.2 parts by weight of the solute. When the content is in the range of 10.0 parts by weight or less, preferably 7.0 parts by weight or more and 8.0 parts by weight or less, the reaction between the silicon-based material as the solute and the SiO ₂ layer on the surface layer of the antireflection film is promoted. Since the adhesiveness between the antifouling film formed from the solute and the antireflection film is enhanced, the adhesive strength can be increased to prevent set-off when wound in a roll.

Since the set-off is prevented in this manner, the adhesiveness between the back surface of the functional film and the adhesive can be sufficiently ensured. When the film is peeled, the adhesive is peeled off with the adhesive adhered to the functional film side without remaining on the panel glass side, thus enabling reuse of the panel glass and reducing the cost of a cathode ray tube using this functional film. Can be.

In the method of attaching a functional film according to the present invention, the resin-coated surface of the panel glass is heated in advance to a temperature higher than room temperature to apply an ultraviolet-curable resin, and the applied ultraviolet-curable resin is reduced in viscosity. Since this is a method with improved fluidity, a functional film can be placed on this UV-curable resin and stretched with a pressure roll, so that the UV-curable resin can sufficiently follow the back surface of the functional film. Therefore, it is possible to eliminate voids between the functional film and the ultraviolet curable resin, thereby increasing the adhesive strength of the functional film to the panel glass, thereby preventing the functional film from peeling off from the panel glass, and Cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a main part showing an example of a functional film manufactured by a manufacturing method of the present invention.

FIG. 2 is an explanatory view of a method for forming an antifouling film.

FIG. 3 is a graph showing a relationship between a catalyst concentration and a set-off amount (back-side F amount).

FIGS. 4A to 4E are diagrams for explaining a method of manufacturing a cathode ray tube in the order of steps.

FIG. 5 is a graph showing the relationship between temperature and viscosity of an ultraviolet curable resin.

FIG. 6 is an enlarged sectional view of a main part showing a state when a functional film is adhered on a panel glass via an ultraviolet-curable resin by the attaching method of the present invention.

FIG. 7 is a graph showing a relationship between a panel glass temperature and an adhesive strength of a functional film adhered on the panel glass via an ultraviolet curable resin.

FIG. 8 is a diagram for explaining a method of mounting and fixing a functional film on an ultraviolet curable resin.

FIG. 9 is an enlarged sectional view of a main part showing a state when a functional film is adhered to a panel glass via an ultraviolet-curable resin by a conventional attaching method.

[Explanation of symbols]

10 functional film, 11 resin film, 14 antireflection film, 15 antifouling film, 16 coating agent, 20
Cathode ray tube (CRT), 21: panel glass, 23: ultraviolet curable resin

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B32B 27/00 101 B32B 27/00 101 5C012 31/28 31/28 5C028 C08J 5/12 CFJ C08J 5/12 CFJ 5C032 C09D 5/00 C09D 5/00 Z H01J 9/20 H01J 9/20 A 9/24 9/24 A 29/89 29/89 // C08L 101: 00 F term (reference) 4D075 BB22X BB42Z BB46Z CA34 CB03 DB13 DC24 EA21 EB42 EC01 4F006 AB67 BA11 BA14 CA08 DA04 4F071 AA01A AA65B AF32B AF55B AF58A AH12 CA01 CB01 CC04 CD03 4F100 AA20C AG00A AH10D AK01B GA17D BA03 BA04 BA07 BA10A BA10D EH462 EJ01 462 KA04 NA05 PA07 PC08 5C012 AA02 BB07 5C028 AA10 5C032 AA02 EE01 EE10 EE17 EF01 EF02 EF04 EF05

Claims (4)

[Claims] 1. An anti-reflection film having a functional film laminated on one surface of a resin film, having an SiO ₂ layer in a surface layer portion, and a functional film formed directly on the anti-reflection film. A functional film comprising at least an antifouling film as the outermost layer of the resin film, and a solution containing a perfluoro group-containing silicon-based material as a solute, An acid ester is added as a catalyst to form a coating agent for the antifouling film, and the obtained coating agent is applied on the antireflection film.
A method for producing a functional film, which further comprises drying the coating agent to form an antifouling film, wherein the coating agent has a solute content of 0.2 part by weight and the catalyst has a content of 7 parts by weight of the solute. A method for producing a functional film, which is prepared so as to be in a range of not less than 0.0 parts by weight and not more than 10.0 parts by weight. 2. The coating agent according to claim 1, wherein the solute has a solute content of 0.
2. The function according to claim 1, wherein the catalyst is prepared so as to be in a range of not less than 7.0 parts by weight and not more than 8.0 parts by weight based on the weight of the solute with respect to 2 parts by weight. Film production method. 3. An ultraviolet-curable resin is applied to an outer surface of a panel glass of a cathode ray tube, a functional film is placed on the ultraviolet-curable resin, and then the ultraviolet-curable resin is irradiated with ultraviolet rays. In the method of attaching a functional film to the panel glass, the resin-coated surface of the panel glass is higher than room temperature prior to applying an ultraviolet curable resin to an outer surface of the panel glass. A method for attaching a functional film, comprising heating the film to a temperature. 4. The method according to claim 3, wherein the heating temperature of the resin-coated surface of the panel glass is in the range of 30 ° C. or more and 45 ° C. or less.