JP2001240689A - Styrene resin film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a styrene resin film having balanced antistaticity, slipperiness and antiblocking property while keeping the transparency of styrene resin film and having improved high-speed transfer property in a machine for pasting an envelop window. SOLUTION: The styrene resin film has coating layers having an areal density of 2-30 mg/m2 on both faces of the film using a coating composition composed of 85-10 wt.% polyether-modified silicone and 15-90 wt.% polyoxyethylene alkylamine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment of a film mainly composed of a styrene resin, and more particularly to a styrene resin film suitable for application to an envelope window.

[0002]

2. Description of the Related Art A styrene resin film has a strong stiffness,
Because of its excellent transparency, it is widely used as a film for food packaging and a film for attaching envelope windows. In recent years, even in applications of styrene-based resin films, processing speed has been increasing due to advances in processing machines. Taking the window application of a film on an envelope as an example, what has been conventionally performed the window application of the envelope at a processing speed of 400 to 600 sheets / min has recently been improved to 800 to 1000 sheets / minute due to the progress of the window application machine. Minutes,
Further, the speed has been increased to 1000 sheets / minute or more, and the running speed of the film has been further increased. Along with this, the demands for films such as antistatic properties, slipperiness and anti-blocking properties are becoming more and more strict in order to obtain machine suitability and processability corresponding to higher processing speeds. It is the current situation.

In the thermoplastic resin film for an envelope window disclosed in Japanese Patent Application Laid-Open No. 10-11978, an anionic surfactant such as a sulfonate and a cationic resin such as a quaternary ammonium salt are mainly added to a styrene resin film. Surfactants, amphoteric surfactants such as betaine-type surfactants, and nonionic surfactants such as fatty acid amides are applied to impart antistatic properties, and in the step of applying a film window to an envelope, It is described that film clogging, wrinkling, and defective bonding position can be eliminated, and the film can be bonded at high speed. However, when the half-life of the charge decay described in Japanese Patent Application Laid-Open No. H10-11978 is about 200 seconds or 150 seconds, the antistatic property is insufficient, and when the window is attached to an envelope at high speed, Since the charge amount of the film becomes large, there is a case where the film is clogged with a machine or the sticking position is shifted. Practically, unless the half-life of the charge decay is less than 60 seconds as an antistatic property, it cannot be said that the film is suitable for attaching to an envelope window.

In the study of the present inventors, in order to reduce the half-life of charge decay to 60 seconds or less, a surfactant having a high HLB value (hydrophilic-lipophilic balance), that is, a surfactant having a high hydrophilicity is used. And the amount of application to the film must be increased. As a result, there is an adverse effect that the blocking phenomenon in which the films are firmly adhered to each other in the roll easily occurs due to the moisture absorption of the applied surfactant. The blocking phenomenon is particularly remarkable under high temperature and high humidity conditions in the summer, and the film is unwound from the roll. ,
The problem that stable operation cannot be performed occurs.

On the other hand, a method of adding or coating fine particles of an inorganic compound or an organic compound to a polymer for the purpose of imparting an anti-blocking property is known. A styrene resin film containing a king agent is disclosed in
No. 9978 discloses the application of silicon dioxide particles together with an antistatic agent. By the method of adding or applying these fine particles, it is possible to impart anti-blocking property and improve the slipperiness, but on the other hand, it deteriorates the transparency of the film, or it can be used with various rolls in an envelope processing machine. There is a problem that fine particles fall off from the film surface at the time of friction and stains occur,
Not preferred.

Japanese Unexamined Patent Publication No. 10-11978 also discloses a modified silicone surfactant (polyether-modified silicone). Although this modified silicone is modified with a hydrophilic polyether group, it exhibits a surface active effect, that is, an antistatic effect. There is a feature that the problem of blocking does not occur even if the number is increased. However, even when this modified silicone-based surfactant is used, there are problems of poor adhesion to paper and deterioration of transparency during recycling. In other words, in order to apply the modified silicone-based surfactant and satisfy both the antistatic property and the anti-blocking property, the coating amount on the film should be the aforementioned anionic, cationic, amphoteric or nonionic. It must be higher than general surfactants such as surfactants. In that case, the water repellency becomes too good due to the effect of the low surface tension of the silicone molecules, and it is difficult to use paper with an envelope window pasting machine. In the bonding step, the adhesiveness with the adhesive is deteriorated. For this reason, a shift in the position of application to the envelope window during the envelope processing is likely to occur. In many cases, styrene-based resin films are produced by recycling the film after applying a surface treatment agent such as a surfactant, but when a large amount of modified silicone-based surfactant is applied, styrene Since the modified resin and the modified silicone surfactant are incompatible, if the amount of the modified silicone surfactant mixed is large, the film is whitened and the transparency is deteriorated, so that it is difficult to use the film for recycling. In other words, in the case of surface treatment with a modified silicone-based surfactant, if the coating amount satisfies both the antistatic property and the anti-blocking property, the adhesion to paper and the transparency after recycling are deteriorated. Is not preferred.

Japanese Patent Application Laid-Open No. 10-11978 discloses an example of a combination of a modified silicone-based surfactant and a fatty acid amide. Balance is not enough. That is, when the modified silicone and the fatty acid amide are applied in combination, the slip property and the anti-blocking property, which are the characteristics of the modified silicone, are inhibited, and the antistatic property, which is the characteristic of the fatty acid amide, is impaired. The goal is not achieved.

[0008]

SUMMARY OF THE INVENTION The present invention balances antistatic properties, slip properties and anti-blocking properties,
An object of the present invention is to provide a styrene-based resin film having excellent adhesiveness to paper and excellent transparency during recycling.

[0009]

Means for Solving the Problems The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, by blending a specific surfactant and a modified silicone compound in a specific ratio, the purpose thereof has been achieved. They have found that this can be achieved and have accomplished the present invention. That is, the present invention relates to a film mainly composed of a styrene-based resin, wherein (A) a polyether-modified silicone: 85 to 10% by weight and (B) a polyoxyethylene alkylamine having a structure represented by the following formula (3): 15 ~ 90% by weight of the coating composition,
A styrene-based resin film characterized in that a coating film of ^{2 to} 30 mg / m ² is formed on both surfaces of the film.

[0010]

Embedded image

(Wherein R is an alkyl group having 8 to 22 carbon atoms, x is an integer of 1 to 30, and y is an integer of 1 to 30.) Further, the polyether-modified silicone (A) has the following formula: It is a styrene resin film having the structure of (4).

[0012]

Embedded image

(Wherein, R is H or a lower alkyl group having 1 to 4 carbon atoms, m is an integer of 0 to 80, n is an integer of 1 to 30, m + n is an integer of 1 to 100, n / (n + m ) = 0.
1-1, a = an integer of 5-30, b = 0 an integer of 0-30, a
+ B = integer of 5 to 60, ratio of a: b is 100: 0 to 5
0:50. Further, on both sides of the film, the coefficient of dynamic friction between the film and the metal is 0.15 to 0.30, the coefficient of static friction between the films is 0.35 to 0.45, and the relative humidity is 20 ° C.
% Is a styrene-based resin film in which the half-life of the charged voltage decay in% is 60 seconds or less.

The present invention will be specifically described below. The film of the present invention mainly comprises a styrene resin. The styrene resin is a polymer containing 50% by weight or more of a styrene monomer, and includes polystyrene, styrene-acrylonitrile copolymer, styrene-methyl methacrylate copolymer, and styrene-butadiene-methyl methacrylate terpolymer. It is a homopolymer of a vinyl aromatic hydrocarbon such as a polymer or a copolymer of a monomer copolymerizable with the vinyl aromatic hydrocarbon. Further, as the soft component, butadiene, a styrene-butadiene random copolymer, a styrene-butadiene block copolymer, or the like may be dispersed. The styrene resin preferably uses general-purpose polystyrene (GPPS) in an amount of 50% by weight or more from the viewpoint of rigidity and transparency.

The styrenic resin film of the present invention may contain known additives such as a heat stabilizer, an antioxidant, and an ultraviolet absorber, in addition to the above resins, in a range that does not impair the requirements and characteristics of the present invention. It is possible to mix with. The styrene resin film of the present invention can be obtained by biaxially stretching by a conventionally known stretching method such as an inflation method or a tenter method. The stretching ratio at that time is 3 to 17 times in each of the longitudinal direction and the transverse direction, and from the viewpoint of the reinforcement of the film strength by the provision of the stretching orientation and the uniformity of the stretching,
Particularly, a range of 4 to 12 times is preferable. However, in the present invention, the stretching ratio is not particularly limited. The film thickness after stretching is preferably 10 to 70 μm,
The thickness is more preferably 15 to 50 μm, but is not particularly limited in the present invention.

Since the surface of the styrene-based resin film itself is hydrophobic, in order to uniformly apply the coating composition of the present invention to the film surface, the film surface to be coated must be subjected to a hydrophilization treatment by corona treatment. Is preferred. This hydrophilic treatment improves the uniformity of the coating film,
Antistatic properties and slipperiness are efficiently exhibited. The surface tension at that time is 400 μN / cm to 600 μN / cm
Is preferable. The polyether-modified silicone (A) used in the present invention is a dimethyl silicone obtained by partially modifying a methyl group with a polyoxyethylene group and a polyoxypropylene group. From the viewpoints of antistatic properties, slipperiness, and antiblocking properties of the film, those having the following formula (5) are preferred.

[0017]

Embedded image

(Wherein R is H or a lower alkyl group having 1 to 4 carbon atoms, m is an integer of 0 to 80, n is an integer of 1 to 30, m + n is an integer of 1 to 100, n / (n + m ) = 0.
1-1, a = an integer of 5-30, b = 0 an integer of 0-30, a
+ B = integer of 5 to 60, ratio of a: b is 100: 0 to 5
0:50. Further, more preferably, in the formula (5), m = 1 to 3
Integer of 0, n / (m + n) = 0.3 to 1, a + b = 5
15. Polyether-modified silicone having a: b ratio of 100: 0.

The polyoxyethylene alkylamine (B) used in the present invention is obtained by an addition reaction between an aliphatic amine having 8 to 22 carbon atoms and ethylene oxide, or a dehydration reaction between the aliphatic amine and polyoxyethylene. Having the structure of the following formula (6).

[0020]

Embedded image

Wherein R is an alkyl group having 8 to 22 carbon atoms, x is an integer of 1 to 30, and y is an integer of 1 to 30. Among them, the antistatic property and slipperiness of the film, and From the viewpoint of the combined effect with the polyether-modified silicone described later, preferably, the aliphatic amine has 8 to 18 carbon atoms, and a saturated aliphatic amine such as laurylamine, myristylamine, and stearylamine is used alone. Or
A polyoxyethylene alkylamine comprising an aliphatic amine which is a mixture of these saturated aliphatic amines and unsaturated aliphatic amines such as oleylamine (eg, higher aliphatic amines derived from coconut oil, tallow, etc.). . More preferably, it is a polyoxyethylene alkylamine in which x = 1 to 15 and y = 1 to 15 in the above formula (6).

The coating composition of the present invention improves the dispersibility of the polyether-modified silicone on the styrene resin film surface by adding a polyoxyethylene alkylamine (B) to the polyether-modified silicone (A). Therefore, the anti-blocking property and the slip property can be efficiently exhibited with a smaller coating amount than when the polyether-modified silicone is used alone. In addition, polyoxyethylene alkylamine has a high antistatic effect on styrenic resin films among nonionic surfactants, and has excellent compatibility with polyether-modified silicone as described above. Even when used in combination with silicone, the antistatic effect can be exhibited with a small coating amount without hindering the antistatic property. Surfactants other than the requirements of the present invention can also provide excellent antistatic properties that are not different from those of the polyoxyethylene alkylamine used in the present invention when used alone. When used in combination, the anti-blocking property and the slipperiness characteristic of the polyether-modified silicone may be impaired, or the antistatic property characteristic of the surfactant may be impaired. Cannot be achieved. That is, in the present invention, for the first time by using a polyether-modified silicone and a polyoxyethylene alkylamine having a specific structure in combination, the antistatic property, the slipperiness, and the antiblocking property are balanced, and the transparency and paper at the time of recycling are improved. A styrene-based resin film having excellent adhesion can be obtained.

The styrenic resin film of the present invention comprises 85 to 10% by weight of the polyether-modified silicone (A) and 15% by weight of the polyoxyethylene alkylamine (B).
It can be obtained by applying a coating composition comprising ９０90% by weight to a styrene resin film. When the content of the polyether-modified silicone (A) is 10% by weight or more, appropriate slip properties and sufficient anti-blocking properties can be obtained. However, if the polyether-modified silicone (A) is less than 10% by weight, slipperiness and anti-blocking properties are insufficient, so that the sticking position is displaced and the film is easily wrapped when the envelope window is stuck. Also, 8
If the content exceeds 5% by weight, the adhesiveness to paper and the transparency of the film at the time of recycling are deteriorated. By setting the polyoxyethylene alkylamine (B) to 15% by weight or more, it is possible to impart good antistatic performance especially under low humidity conditions (20 ° C., relative humidity 20%). When the amount is less than% by weight, the antistatic property is insufficient, so that the film is liable to be clogged and the sticking position is shifted when the envelope window is stuck. On the other hand, when the content exceeds 90% by weight, the friction between the films and the anti-blocking property are deteriorated, and the winding of the film is liable to occur when the envelope window is applied. Further, it is difficult to stably feed a roll-shaped film, which is not preferable. It was difficult to satisfy all of the antistatic properties, slip properties, anti-blocking properties, and transparency by using the single coating system of each of the polyether-modified silicone (A) and the polyoxyethylene alkylamine (B). However, by using these in combination, the uniform dispersibility of the polyether-modified silicone on the film surface is improved, the slip property and the antistatic property are synergistically improved, and the anti-blocking property can be simultaneously provided. . Also, from the viewpoint of the balance of the performance,
40-60% by weight of polyether-modified silicone (A)
And polyoxyethylene alkylamine (C)
It is preferable to mix and apply 40% by weight.

For the purpose of preventing the coating composition from transferring from the film surface to the outside, a water-soluble polymer such as polyvinyl alcohol, polyvinylpyrrolidone, or sodium polyacrylate is added to the coating composition of the present invention. You may add in the range which does not impair the requirement and characteristic of invention. The coating amount of the coating composition of the present invention on the styrene resin film is at least 2 to 30 mg.
/ M ² , preferably ² to 15 mg / m ² .
If the amount is less than 2 mg / m ² , the antistatic property is insufficient, so that the displacement of the sticking position tends to occur at the time of applying the envelope window. Conversely, if the amount is 30 mg / m ² or more, the transparency and the anti-blocking property during recycling are poor. Therefore, it is difficult to use it suitably.

As a method of forming a coating film on the styrene resin film of the coating composition, a conventionally known method such as a spray coater, a roll coater, a squeeze roll coater, and an air knife coater can be employed. The coating composition was uniformly coated on the film surface, and in order to make the coating amount range described above, the coating composition was diluted with a solvent such as water or an organic solvent, and uniformly coated on the styrene resin film surface with the above coater. Thereafter, a method of drying and removing the solvent in a drying furnace such as a hot air dryer is preferable.

In the styrenic resin film of the present invention, it is preferable to apply the coating composition to both surfaces because the coating film must be formed on both surfaces. However, the coating composition diluted with a solvent is preferred. Is wound on a roll before being completely dried (before the solvent is completely removed) after being applied on one side, the coating composition is transferred to the opposite side by winding tension, and the coating film is applied on both sides. May be formed.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described by way of examples and comparative examples. First, evaluation methods used in Examples and Comparative Examples will be described below. (1) Half-time of decay of charged voltage Static honest meter (H-made by Shishido Electrostatic Co., Ltd.)
0110 type) in accordance with JIS-L-1094 in an atmosphere of a temperature of 20 ° C. and a relative humidity of 20% under the conditions of an applied voltage of 10 kv and an electrode-sample distance of 20 mm. Significant figures were obtained up to the first digit. (2) Dynamic friction coefficient between film and metal According to JIS-K-7125, using a stainless steel sliding piece having a contact area with the film of 50 mm × 30 mm, a weight of 110 g and a mirror-finished surface state, 1000 mm / min. At a speed, the dynamic friction coefficient was measured under environmental conditions of a temperature of 23 ° C. and a relative humidity of 50%, and the second to the second decimal place were obtained as significant figures.

(3) Coefficient of static friction between films According to ASTM F254-89, after attaching a sample film to a table whose tilt angle can be varied, the same film as the sample is attached to the surface, and the weight is 200 g.
Are placed so that the film surfaces are in contact with each other. Then, the inclination angle of the table is tilted from 0 ° (horizontal) to 90 ° (vertical) at a rate of 90 ° / min, and the inclination angle θ of the table when the metal piece to which the film is attached starts to slide is determined. Reading was performed to one digit after the decimal. From the angle θ, the coefficient of static friction was calculated by the following formula, and the number was calculated as a significant figure up to the second decimal place. The measurement is
The test was performed under environmental conditions of a temperature of 23 ° C. and a relative humidity of 50%. Static friction coefficient = tan θ

(4) Transparency The styrene resin film coated with the coating composition was pulverized, melted at 200 ° C. with an extruder and formed into chips.
Next, the obtained chip was melted at 200 ° C. for 1 minute by a hot press and then cooled to obtain a resin plate having a thickness of 3 mm. The haze value was measured according to ASTM-D1003. The evaluation was performed in the following four steps based on the difference in haze value, based on the haze value of a resin plate obtained from a styrene-based resin film not coated with the coating composition. ◎: Difference from standard haze value ≦ 1.0% (good transparency) ○: 1.0% <Difference from standard haze value ≦ 2.0% (transparency is slightly good) Δ: 2.0% <Difference from reference haze value ≦ 3.0% (slightly poor transparency) ×: Difference from reference haze value> 3.0% (defective transparency)

(5) Anti-blocking properties Sample films cut to a width of 70 mm are superimposed,
Under a load of 50 kg / cm2, temperature 50 ° C, relative humidity 85
After holding for 15 hours under the% condition, the load at the time of peeling the contact surface was measured, and the anti-blocking property was evaluated according to the following criteria. ：: Load at peeling ≦ 10 g (good blocking prevention) ○: 10 g <load at peeling ≦ 15 g (slightly good blocking prevention) Δ: 15 g <load at peeling ≦ 30 g (slightly poor blocking prevention) ×: Peeling load> 30 g (poor blocking prevention)

(6) Evaluation by an Envelope Window Pasting Machine A window pasting machine (WINKLER + DUNNERBIER HELIOS 202 type) was used to attach 1000 to a 50 × 90 mm window frame in a 135 × 235 mm envelope (paper).
At the speed of sheets / min, 20,000 envelopes were pasted on a window, and the following items were evaluated. (6-a) Evaluation of misregistration Out of 20,000 window-attached envelopes, 19001 sheets to 2 sheets
10 out of 1000 sheets up to the 0000th sheet at random
0 samples were extracted, and one sample having a deviation from a predetermined bonding position of less than 0.5 mm was selected as one point, from 0.5 mm to 1.0 mm.
0.5 mm for items less than 1.0 mm, and 0 for 1.0 mm or more
The points were evaluated based on the total score of 100 sheets. ◎: 100 points ：: 97.5 to 99.5 points Δ: 95.
0 to 97.0 points ×: less than 95.0 (6-b) Evaluation of winding between films The evaluation was made based on the following criteria based on the number of times the winding between the films occurred during the application of 20,000 sheets of windows. ◎: 0 times ○: 1 time △: 2 times ×: 3 times or more

The styrene resin in the following Examples and Comparative Examples was GPPS (general-purpose polystyrene, molecular weight 33).
0000, Vicat softening point 106 ° C) 97% by weight and H
IPS (high impact polystyrene, molecular weight 3500
A mixture of 00, a Vicat softening point of 94 ° C., a rubber concentration of 6% by weight, and an average rubber particle size of 3 μm) of 3% by weight was used in all Examples and Comparative Examples. However, the composition of the styrene resin in the present invention is not limited to this.

In the stretch film formation into a film, the resin is extruded from an annular slit die using a single screw extruder, and the center of the bubble is reduced to 1 by an inflation method.
While adjusting the temperature of the bubble chamber so as to be 17 to 122 ° C., it is stretched 5.5 times in the vertical direction and 6.3 times in the horizontal direction, and has a thickness of 3 times.
A 0 μm film was obtained. The outer surface when the bubble was formed was defined as the surface of the film, and the inner surface was defined as the back surface. As in the case of the resin composition, the above-mentioned film was used in all the examples and comparative examples.

In Examples and Comparative Examples, surfactants such as polyether-modified silicone and polyoxyethylene alkylamine, which were blended as a coating composition, are shown in Tables 1 and 2, respectively. As a method of applying the surface treating agent in Examples and Comparative Examples, first, a corona treatment was performed so that the surface of the film to be applied had a surface tension of 500 μN / cm. The corona treatment was performed using AGI-060MD manufactured by Kasuga Electric Co., Ltd. Next, an aqueous solution of the coating composition having a surface treatment agent concentration of 0.3% by weight was applied to the film surface with a spray coater, and then passed through a hot air dryer at 90 ° C. to remove moisture. The coating amount was adjusted under the conditions of the spray coater (air pressure and line speed), but the coating amount described in Examples and Comparative Examples was 10 m for the film after coating.
Sample No. ² was sampled, the coating composition was washed with ethyl alcohol, the film weight after washing was weighed, and the difference in weight before and after washing was calculated in mg / m ² .

[0035]

Examples 1 to 5 The films of Examples 1 to 5 shown in Table 3 were prepared by blending the polyether-modified silicone of Table 1 and the polyoxyethylene alkylamine of Table 2 as a coating composition, and applying the composition to the film. However, it is within the range of the composition and coating amount which are the requirements of the present invention. As shown in the evaluation results in Table 3, antistatic properties (half-life of charged voltage), slip properties (film-metal dynamic friction coefficient, film-film static friction coefficient), and
It has excellent anti-blocking properties, and extremely excellent evaluation results have been obtained with an envelope window sticking machine.

[0036]

Comparative Examples 1 to 6 Comparative Examples 1 to 6 are shown in Table 3 with respect to the above examples. Comparative Examples 1 to 6 are cases in which polyether-modified silicone and polyoxyethylene alkylamine were individually applied to a film, which deviated from the requirements of the present application. As shown in the evaluation results in Table 4, when these coating agents are added alone, even if the coating amount is increased or decreased,
It is difficult to use because the antistatic property, the antiblocking property, and the slipperiness are not balanced, and the occurrence of misregistration at the time of applying the envelope window or the transparency is deteriorated. .

When the polyether-modified silicones of Comparative Examples 1 to 3 were applied alone, the antistatic properties were insufficient when the coating amount was small, and a positional shift occurred when the envelope window was applied. Conversely, as the amount of application increased, the transparency deteriorated, and the adhesiveness to paper also deteriorated, so that misalignment was likely to occur when the envelope window was applied. When the polyoxyethylene alkylamines of Comparative Examples 4 to 6 were applied alone, the antistatic properties were insufficient and the slipperiness was poor when the coating amount was small, so that misregistration was likely to occur when attaching the envelope window. Conversely, when the coating amount was increased, the anti-blocking property was deteriorated, and the winding of the film at the time of applying the envelope window was likely to occur.

[0038]

Examples 6 to 10 In Examples 6 to 10 shown in Table 4, the coating amount of the coating composition was larger than that in Examples 1 to 5. Yes. The evaluation results also satisfy the object of the present invention.

[0039]

Comparative Examples 7 and 8 In Comparative Examples 7 and 8 in Table 4, the amount of coating on the film was the same as in Examples 6 to 10, but the mixing ratio of the coating composition was outside the requirements of the present invention. It is. These films are in the range deviating from the requirements of the present invention, the antistatic property, the anti-blocking property, and the balance of the slipperiness is not balanced, the position shift at the time of applying the envelope window, or film winding occurs, Preferably, it is difficult to use.

In Comparative Example 7, the ratio of the polyether-modified silicone was high and the ratio of the polyoxyethylene alkylamine was low. As shown in the evaluation results in Table 4,
Since the transparency was poor and the antistatic property was insufficient, the misregistration during the application of the envelope window was increased and the poor was obtained. Comparative Example 8 is a case where the ratio of the polyether-modified silicone is low and the ratio of the polyoxyethylene alkylamine is high. In this case, the anti-blocking property was poor, and the film winding when attaching the envelope window was poor.

[0041]

Comparative Examples 9 and 10 Comparative examples 9 and 10 in Table 4 are cases where only the type of polyoxyethylene alkylamine was changed from Comparative Examples 7 and 8, respectively. As in Comparative Examples 7 and 8, the compounding ratio deviates from the requirements of the present invention, and it is difficult to use it because it may be misaligned when the envelope window is pasted or the transparency may be deteriorated. . Comparative Example 9
Is a case where the ratio of the polyether-modified silicone is high and the ratio of the polyoxyethylene alkylamine is low.
As shown in the evaluation results in Table 4, the transparency was Δ and the antistatic property was insufficient, so that the misregistration at the time of attaching the envelope window was increased and Δ was given.

Comparative Example 10 is a case where the ratio of the polyether-modified silicone is low and the ratio of the polyoxyethylene alkylamine is high. In this case, the anti-blocking property was poor, and the film winding when attaching the envelope window was poor.

[0043]

Comparative Examples 11 to 14 In Comparative Examples 11 and 12 in Table 4, the blending ratio of the polyether-modified silicone and the surfactant and the amount of coating on the film were the same as in Example 6, and Comparative Examples 13 and 14 were the same. Same as Example 7, except that surfactants outside the requirements of the invention were used. In any case, a product that achieves the object of the present invention was not obtained. Comparative Examples 11 and 13 are cases in which hydroxyethyl laurylamine was used as the surfactant. In Comparative Example 11 in which the proportion of the surfactant was small, the antistatic property was low, and the misregistration when attaching the envelope window was Δ. And the anti-blocking property was also poor. In Comparative Example 13 in which the proportion of the surfactant was large, the antistatic property was not sufficient, the positional deviation when attaching the envelope window was Δ, the film winding was also Δ, and the anti-blocking property was Δ.

Comparative Examples 12 and 14 are cases where coconut oil fatty acid amide was used as a surfactant. In Comparative Example 11 in which the proportion of the surfactant was small, the antistatic property was low, the positional shift when attaching the envelope window was Δ, and the antiblocking property was also Δ. In Comparative Example 13 in which the proportion of the surfactant was large, the antistatic property was not sufficient, the positional deviation when attaching the envelope window was Δ, the film winding was also Δ, and the anti-blocking property was Δ.

[0045]

Comparative Examples 15 to 18 Comparative examples 15 to 18 in Table 5 are compositions in which polyether-modified silicone and polyoxyethylene alkylamine are blended as a coating composition, but the coating amount is outside the requirements of the present invention. is there. If the coating amount is small, the antistatic property is insufficient, and the misalignment at the time of applying the envelope window is likely to occur. Conversely, if the coating amount is large, the transparency and the antiblocking property of the film are deteriorated. I will. In any case, it is preferably difficult to use. In Comparative Examples 15 and 16, where the coating amount was too small, the antistatic property and the slipperiness were poor, and the positional shift when attaching the envelope window was x. Comparative Examples 17 and 18 are cases where the coating amount is too large, but the antistatic property is high, but the antiblocking property is Δ, the transparency of the film is x, and the adhesion to paper is poor. Occasionally, misalignment was likely to occur, and the evaluation was evaluated as x.

[0046]

[Table 1]

[0047]

[Table 2]

[0048]

[Table 3]

[0049]

[Table 4]

[0050]

[Table 5]

[0051]

The styrenic resin film of the present invention is characterized by using a specific polyether-modified silicone and a specific polyoxyethylene alkylamine in combination, and has an excellent antistatic effect (20) which could not be realized by itself. ℃,
Under the condition of 20% relative humidity, the half life of the charged voltage is 6
0 seconds or less) and the anti-blocking property and the slip property can be balanced. As a result, in a high-speed window application to an envelope exceeding 1000 sheets / minute accompanied by a high-speed running of the film, a good finish and mechanical suitability without displacement of the application position and winding of the film are provided.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F006 AA15 AB39 AB65 BA07 BA09 BA12 CA07 DA04 4F100 AK12A AK52B AK52C AK54B AK54C AL05B AL05C AL06B AL06C BA03 BA06 BA10B BA10C BA13 GB17 JA13B JA13C JG03 Y00Y00 JL00

Claims (3)

[Claims] 1. A film mainly comprising a styrene resin, wherein (A) a polyether-modified silicone: 85
A coating composition comprising 10 to 10% by weight and (B) a polyoxyethylene alkylamine having the structure of the following formula (1): 15 to 90% by weight is coated on both surfaces of the film with 2 to 10% by weight.
A styrene-based resin film having a coating film of 30 mg / m ² . Embedded image (Wherein, R is an alkyl group having 8 to 22 carbon atoms, x = 1 to 3)
Integer of 0 and y = 1 to 30. ) 2. The polyether-modified silicone (A)
The styrene resin film according to claim 1, which has a structure represented by the following formula (2). Embedded image (Wherein, R is H or a lower alkyl group having 1 to 4 carbon atoms, m is an integer of 0 to 80, n is an integer of 1 to 30, m + n
= An integer of 1 to 100, n / (n + m) = 0.1 to 1, a
= Integer of 5 to 30, b = integer of 0 to 30, a + b = 5
The integer of 60 and the ratio of a: b are 100: 0 to 50:50. ) 3. On both sides of the film, the coefficient of kinetic friction between the film and the metal is 0.15 to 0.30, the coefficient of static friction between the films is 0.35 to 0.45, and the band at 20 ° C. and 20% relative humidity. 3. The styrene-based resin film according to claim 1, wherein the half time of voltage decay is 60 seconds or less.