KR100820784B1 - Silicone Release Plastic Film with Superior Anti-static Property - Google Patents

Abstract

The present invention relates to a silicone release plastic film having an excellent antistatic property with a unique silicone release composition and an antistatic inline coating coated during the plastic film manufacturing process using the same. The composition of the silicone release liquid according to the present invention is excellent in silicone curing properties by sufficiently curing silicon by coating and applying a polyester stretch film using a release solution containing a hexenyl group and a hydroxyl group containing a polysiloxane, a hydropolysiloxane, and a platinum catalyst. The present invention relates to a silicone release plastic film having excellent antistatic properties with excellent anti-adhesive properties and excellent anti-static property between silicon and plastic.

To this end, the silicone release plastic film having excellent antistatic properties according to the present invention includes a silicone, a silicone release liquid including a polysiloxane (polysiloxane) containing a hydroxyl group and a hexenyl group, and a hydropolysiloxane, on at least one side of the substrate. The release layer is characterized in that the coating step of the plastic film manufacturing process made of a silicone release layer coated with a constant coating thickness.

Plastic release film, polysiloxane including hexenyl and hydroxyl groups, antistatic

Description

Silicon Release Plastic Film with Superior Anti-static Property

The present invention relates to a silicone release plastic film having excellent antistatic properties, and more particularly, to a silicon layer including a hydroxyl group having excellent love-off properties after aging under high conditions of aging stability and humidity. The present invention relates to a silicone release polyester film.

Generally, the silicone release agent is divided into a silicone main chain, a silicone curing agent, a catalyst, and the like, in the case of the main chain, vinyl polysiloxane, and the curing agent is a hydrogenated polysiloxane.

A general mold release layer can be obtained by apply | coating a mold release agent to base materials, such as a plastic film, a sheet | seat or paper, and a nonwoven fabric. USP 3,076,726; USP 3,169,884; USP 3,427,270; US Pat. No. 3,900,617 et al. Discloses a technique for applying a silicone layer onto a substrate, i.e. plastic film, cellulose and paper.

Regarding the antistatic properties, the antistatic properties were secured by containing sulfonate-based components as in KR0175549, but these properties have properties separate from those of the release property, and tetravalent ammonium, a cationic antistatic agent mentioned in KR 0157181. The property had a problem with the release property. In addition, by containing the silicate containing a hydroxyl group mentioned in USP 5,318,724, the hydrophilic portion is oriented toward the atmosphere to absorb water from the surface to form a water film layer to secure the antistatic property, but the silicate containing a hydroxyl group alone In use, there was a disadvantage that the problem of the release characteristics.

The present invention has been made to solve the above problems, an object of the present invention is to reduce the cost of offline offline by applying silicon to one or both sides of the film during the polyester film manufacturing process, hex having an antistatic function by containing a hydroxyl group The present invention is to provide a silicone release plastic film having excellent antistatic properties having excellent antistatic properties when coated by applying a polysilyl siloxane and hydropolysiloxane which can improve adhesion with polyester to a silicone formulation.

These and other objects and advantages of the present invention will become more apparent from the following description of preferred embodiments.

Silicone release plastic film excellent in antistatic properties according to the present invention for achieving the above object is 4.5 to 30% by weight of a hexenyl polysiloxane solid agent containing a hydroxyl group and a hexenyl group on at least one side of the substrate, hydro-electric Silicone release layer coated with a silicone release liquid consisting of 0.3 to 3% by weight of polysiloxane, 0.002% to 0.005% by weight of a platinum catalyst, and the remaining amount of water, and is a silicon release layer coated with a constant coating thickness through a coating process in a plastic film manufacturing process. Characterized in that consisting of.

Preferably, the polysiloxane containing the hydroxyl group and the hexenyl group has the structure of the following formula (1), the hydropolysiloxane is characterized in having the structure of the following formula (2).

[Formula 1]

[Formula 2]

Preferably, in Formula 1 and Formula 2, m, n, p, q and r are integers of 5 or more having a polymer structure, and satisfying the conditions of 1.2 <r / m <2.5 and n / p> 3. It features.

More preferably, the coating thickness after drying of the silicon release layer is characterized in that 0.06 to 1.6㎛.

Hereinafter, the present invention will be described in detail with reference to embodiments of the present invention. These examples are only presented by way of example only to more specifically describe the present invention, it will be apparent to those of ordinary skill in the art that the scope of the present invention is not limited by these examples. .

In general, polyesters or polysiloxanes, such as polyethylene terephthalate, polybutylene terephthalate has a low polarity as the dielectric (DW Van Krevelen Properties of Polymers 3 rd ed.). Polyester silicone release film has a static electricity characteristic that is easy to occur during driving during the protection and peeling of the adhesive, there is always potential latent mixing and peeling instability. It can be said that the static and seasonal stability is always an unstable factor because the electrostatic properties depend on temperature, relative humidity, and the like. The antistatic property of the silicone release film to prevent foreign matters mixed to secure the optical stability of the pressure-sensitive adhesive for electronic display and to ensure the uniformity of the peel can be the most important technical problem in the release film.

Accordingly, the inventors of the present invention have confirmed that a release film having excellent peeling force and an antistatic property may be manufactured by using a polymer having a characteristic of a polysiloxane structure including a hydroxyl group and a hexenyl group.

According to the present invention, a polyester film is uniformly coated during the manufacturing process, and the film using the same is a polarized film (ML) (Polarized film), MLCC (Multi-Layer-Ceramic Capacitor), which can be used for high quality and differentiation in various release markets. It can be used in various fields such as carrier release, LCD protection release film, overlaid use, medical pathy, FPC protection film and ECG protection film used in manufacturing.

Silicone release agent composition (hereinafter also referred to as "silicone release liquid") according to an embodiment of the silicone release plastic film excellent antistatic properties according to the present invention, 4.5 to 30% by weight of a hexenyl polysiloxane solid agent, hydro 0.3 to 3 weight percent total polysiloxane, 0.002 to 0.005 weight percent platinum catalyst and residual water.

The average particle size of the hexenyl polysiloxane solids is 0.01 to 1 μm.

The silicone release agent composition may be directly applied on the film, kraft paper, nonwoven fabric, cloth, etc. of the laminated material of polyester, polypropylene, polyethylene, polyvinyl chloride, nylon, polycarbonate, plastic, the total solid content of the release agent composition is 4.5 to 30% by weight, more preferably 6 to 20% by weight. If the solid content is less than 4.5% by weight, there is a problem in uniform coating and the release property is poorly expressed. If the solid content is higher than 30% by weight, the coating streaks and coatings are increased due to the increase in the viscosity of the release liquid. This is because problems such as coating defects occur.

The silicone release liquid is preferably about 0.04 to 2.0 g / m 2, and more preferably 0.06 to 1.6 g / m 2 as the dried silicon thickness.

The hexenyl polysiloxane structure containing a hydroxyl group of the silicone release agent composition according to an embodiment of the silicone release plastic film having excellent antistatic properties according to the present invention is represented by the following Chemical Formula 1, and the structure of the hydrogen polysiloxane is represented by the following Chemical Formula 2 and same.

[Formula 1]

[Formula 2]

In Formula 1 and Formula 2, m, n, p, q and r are integers of 5 or more having a polymer structure, and the range of r / m is 1.2 <r / m <2.5, and n / p> 3. Have This is because there is a problem of hardening when the range of r / m is less than 1.2, and an unreacted hydropolysiloxane reacts with an adhesive such as acryl after curing of the silicone layer, and causes an increase in peeling force. In addition, if the range of n / p is less than 3 because the film properties predominantly antistatic properties are implemented to be a coating film having a characteristic that the peel force is heavy.

On the other hand, in applying the release liquid in the silicone release plastic film with excellent antistatic properties according to an embodiment of the present invention, the plastic film is a biaxially oriented film or corona treatment or plasma treatment biaxially oriented film or corona treatment to the unstretched sheet It can be applied to substrates such as sequential stretching films and polyesters subjected to corona or plasma treatment immediately before simultaneous biaxial stretching, polyethylene, polypropylene, nylon, polycarbonate, polyvinylchloride, PVA and the like.

Example 1-3

Examples 1 to 3 are silicon release plastic films having excellent antistatic properties, which are made under the conditions shown in Table 1, respectively. In this embodiment, the material having the structure of Formula 1 and Formula 2 was applied in-line coating during the polyester film manufacturing process. In-line coating did not have any problem when applying Gravure, Wire Bar, Grooved, Comma, Multi-Pressure-Gravure 5 Roll or 6 Roll coating. Various meshes could be applied for thickness control. The substrate used in the experiment was a B sheet having surface characteristics similar to that of the XD500-38 μm commercially available for the TORAYSAEHAN MLCC release carrier developed by the present inventors. Here, the "B sheet" refers to a sheet in which the polyester polymer chip is melt-extruded and cooled to an amorphous state sheet during the polyester film production process, and the "A sheet" is stretched in the longitudinal direction.

10, 8, 6 wt% of the hexenyl polysiloxane solid agent containing hydroxyl and hexenyl groups on the B sheet (Examples 1, 2 3, respectively), 1 wt% of hydropolysiloxane, 0.003 wt% of platinum catalyst, and In-line coating was applied to coat the silicone release liquid consisting of the residual amount of water. After the drying of the silicon release layer, the coating thickness was 0.12 μm.

Comparative Example 1-3

Comparative Examples 1 to 3 is a silicone release plastic film prepared in the same manner as in Examples 1 to 3 except that each made of the conditions shown in Table 1.

Hereinafter, experimental examples applied to Examples and Comparative Examples according to the present invention will be described.

Experimental Example

Peel force of adhesive tape

After silicone coating, the cured film was placed on a silicone coated surface with adhesive tape TESA 7475 with a load of 2kg _f . Using the model, the peel force was measured three times at a speed of 0.3 m per minute at a 180 degree peel angle, and the average value was taken.

Rub-off after Aging

Using the model TH-I-180 of JEIOTECH, left the silicone-coated film under 50 ° C and 95% RH conditions for 3 days, and then pushed it strongly with a finger to determine the degree of dropping of the silicon layer on the polyester film layer (Rub-off test) Adhesion between the cured silicone and PET film was confirmed.

Surface resistance

After the release film was allowed to stand for 8 hours at 23 ° C. and 60% relative humidity, the antistatic property was evaluated using a surface resistance meter, and the unit was Ω / □.

Residual adhesion rate

Residual adhesion rate is an indirect evaluation method for measuring the degree of cure of the silicone layer, after the adhesive tape on the silicone coating layer after a certain period of time after removing it was attached to the untreated film was confirmed the change in the adhesive strength of the adhesive tape. If the residual adhesion rate of 95%, 5% means that the silicone was transferred to the tape unreacted.

TABLE 1

In Table 1, "solid content (% by weight)" refers to "hexenyl polysiloxane solid agent containing a hydroxyl group and a hexenyl group" in the composition of the silicone release liquid.

As can be seen in Table 1, when using the same polysiloxane molecular structure as in Example 1 to Example 3, the higher the thickness of the dried coating layer was confirmed that the peeling force is lower, the hydrogen contained in the hydrogen polysiloxane When the number of repeating units r of the group and the number of repeating units including the hexenyl group of the siloxane containing the hexenyl functional group is m, it can be seen that the residual adhesion rate is increased when the value of r / m is high. This was confirmed in Examples 1 to 3 and Comparative Examples 1 to 3 that the hydropolysiloxane is highly reactive with the polyethylene terephthalate and the acrylic adhesive tape, and the dimethyl group of the siloxane having a hexenyl functional group. The lower the n / p number, the higher the peeling force and the higher the antistatic function. In addition, as the number of repeating units of the hydroxyl group was higher, the antistatic property was excellent, but the peeling force was increased. In conclusion, excellent peeling force and antistatic property were found in Example 1 containing the appropriate solids, and Examples 2 and 3 were measured to have a high peeling force due to the low coating amount compared to Example 1. However, Comparative Examples 1 to 3 was confirmed that the peeling force and the antistatic property is less than the appropriate level compared to the examples.

In addition, the present invention by manufacturing the sequential biaxially stretched film, that is, by the in-line coating before stretching in the tenter direction by coating the release liquid in the stretched and wet state, it was possible to reduce the processing cost and the amount of foreign matter than the conventional offline coating. Due to the increase in the processing process, the possibility of containing external foreign matters is inevitably increased, and the foreign foreign matters may be fatal external defects due to an increase in peel force and transfer of the adhesive layer in electric and electronic applications. Therefore, by applying the in-line coating method using the siloxane having a unique structural formula mentioned in the present invention it was possible to produce an excellent release film.

According to the present invention, not only the release property is excellent, but also the antistatic properties can reduce the adhesion of dust or foreign matter to the polyester film, and because of this, for high performance release film MLCC release carrier and polarizer release, polarizer protection release (Separator), medical release, electrical and electronics, display protection can be used for the release and the like.

Claims (4)

Silicone release plastic film with excellent antistatic properties With a substrate, 4.5 to 30% by weight of a hexenylpolysiloxane solid agent containing hydroxyl and hexenyl groups on at least one side of the substrate, 0.3 to 3% by weight of hydropolysiloxane, 0.002% to 0.005% by weight of platinum catalyst and the remaining water A silicone release layer coated with a silicone release liquid made of a silicone release layer, characterized in that made of a silicone release layer coated with a constant coating thickness through the coating process of the plastic film manufacturing process, excellent anti-static silicone release plastic film. The method of claim 1, The polysiloxane containing the hydroxyl group and the hexenyl group has the structure of Formula 1, wherein the hydropolysiloxane has the structure of Formula 2, In Formula 1 and Formula 2, m, n, p, q and r are integers of 5 or more having a polymer structure, and satisfying the conditions of 1.2 <r / m <2.5 and n / p> 3, Silicone release plastic film with excellent antistatic properties. [Formula 1]

[Formula 2]

delete The method according to claim 1 or 2, The coating thickness after the drying of the silicone release layer is characterized in that 0.06 to 1.6㎛, silicon release plastic film with excellent antistatic properties.