JP5038605B2 - Film for window, method for attaching the film, film for scattering prevention and film for crime prevention - Google Patents

Description

  The present invention relates to a window film to be attached to a window, a method for attaching the film, a film for preventing scattering, and a film for crime prevention.

  2. Description of the Related Art Conventionally, a film called a window film has been attached to a window such as a window glass in order to prevent breakage due to crime or the like, and scattering of glass pieces damaged by an earthquake or the like. As this window film, Patent Document 1 describes a glass protective film having a multilayer structure composed of two types of thermoplastic resins having a predetermined glass transition temperature and having a surface impact strength of a predetermined value or more. Has been. Patent Document 2 describes a laminated film in which a pressure-sensitive adhesive layer having a predetermined adhesive strength with glass is formed on at least one side, and the tear strength is not less than a predetermined value. According to Patent Documents 1 and 2, it is described that breakage and scattering of glass can be prevented.

  However, it is difficult to attach a window film to a plate-like window so that no wrinkles or bubbles are generated. For this reason, when sticking the film as described in Patent Documents 1 and 2 to the window, wrinkles, bubbles, or the like may occur. Generation | occurrence | production of a wrinkle, a bubble, etc. is unpreferable since it impairs the aesthetic appearance.

  In order to prevent mist and air bubbles from entering, spray an aqueous solution such as a surfactant on the window when sticking the film, stick a window film on it, and then use a spatula or the like to fold the film. There is a method in which an aqueous solution and air bubbles are pushed out between the window and the film, and the film is attached to the window. However, this method requires a skillful technique, and furthermore, since the enforcement time required for sticking is long, it cannot be easily stuck.

  In order to solve such a problem, Patent Document 3 discloses a laminate in which a release film is laminated on both sides of a predetermined base film having such a degree of adhesive that at least one side can be attached to glass. A laminate for preventing glass scattering is described in which the body has a property of curling in the direction of the surface opposite to the surface on which the substrate film is adhered to glass.

  According to this document, the laminate is curled by a specific amount of curl in the direction opposite to the surface on which the base film is attached to the glass, so it can be easily produced without generating wrinkles or bubbles. It is described that a base film can be attached to glass.

  However, since the base film described in Patent Document 3 has high adhesiveness at room temperature, it is difficult to rework when the films are mistakenly attached to each other or the attachment position is incorrect. Positioning is difficult.

JP 2004-130762 A JP 2004-155188 A JP-A-10-76604

  An object of the present invention is to provide a window film that can be easily attached to a window without generating wrinkles, bubbles, etc., and that has high adhesive strength after attachment, a method for attaching the film, and a film for preventing scattering. And providing crime prevention films.

  In order to solve the above problems, the present inventors considered that it is sufficient to use a pressure-sensitive adhesive that does not have an adhesive force during positioning to the window and that expresses a high adhesive force after positioning. The inventors have found a new solution to use a specific temperature-sensitive adhesive as a window film adhesive, and have completed the present invention.

（７）可視光領域での透過率が８０％以上である前記（１）〜（６）のいずれかに記載のウィンドウ用フィルム。 That is, the window film of the present invention has the following configuration.
(1) One side of a base film is coated with a temperature-sensitive adhesive that exhibits fluidity at a temperature higher than the melting point higher than the surface temperature of the adherend window and crystallizes at the window surface temperature. A film for windows characterized in that the adhesive strength in a state where it is adhered to the substrate exceeds 400 g / 25 mm in 180 ° peel strength.
(2) The film for windows according to (1), wherein the temperature-sensitive adhesive has a melting point of 30 to 70 ° C. and crystallizes below the melting point.
(3) The temperature-sensitive adhesive is an acrylic ester having 30 to 80 parts by weight of an acrylic ester or methacrylic ester having a linear alkyl group having 16 or more carbon atoms and an alkyl group having 2 to 8 carbon atoms. Or the film for windows of said (1) or (2) which is a polymer obtained by polymerizing 20-70 weight part of methacrylic acid ester, and 0-10 weight part of polar monomers.
(4) The window film according to (3), wherein the polymer has a weight average molecular weight of 200,000 to 1,000,000.
(5) The temperature-sensitive adhesive has no adhesive force at the window surface temperature, and is heated to a temperature equal to or higher than the melting point higher than the window surface temperature and then subjected to pressure bonding. The window film according to any one of (1) to (4), wherein an adhesive strength exceeding 400 g / 25 mm is exhibited.
(6) The window film described in any one of (1) to (5), in which the reduction rate of the adhesive force calculated from the following formula (I) is 60% or more.

(7) The film for windows according to any one of (1) to (6), wherein the transmittance in the visible light region is 80% or more.

  The method for sticking a window film according to the present invention includes positioning the window film according to any one of (1) to (7) above on the surface of the window at the surface temperature of the window. It is characterized by being heated to a temperature equal to or higher than the melting point higher than the surface temperature and pressure-bonded, and then returned to the surface temperature of the window and adhered to the surface of the window.

  The anti-scattering film of the present invention is characterized by comprising the window film according to any one of the above (1) to (7), and the anti-crime film of the present invention is the above (1) to (1) to (7). It consists of the film for windows as described in any one of (7).

  According to the present invention, the pressure-sensitive adhesive applied to the base film of the window film is a specific temperature-sensitive pressure-sensitive adhesive, and since the pressure-sensitive adhesive has no adhesive force at the window surface temperature, it can be positioned easily. , It can easily be made without any wrinkles or bubbles (even if there are wrinkles or bubbles, it has no adhesive power and can be easily removed). Further, after heating and flowing the pressure-sensitive adhesive to a temperature higher than the surface temperature, when returning to the surface temperature, the adhesive is crystallized again to exhibit a predetermined adhesive force and can be adhered to a window. Will not peel off. In addition, when the film is peeled off from the window, the adhesive can be easily peeled off without damaging the window surface because the resin will be in a fluid state if the temperature is reheated to a predetermined temperature. it can.

  According to the above (2), the temperature-sensitive adhesive according to the present invention can be brought into a state having no adhesive force at the surface temperature of the window. According to the above (3) to (5), the cohesive force of the temperature-sensitive adhesive according to the present invention can be increased, so that even if the film is stuck to a window for a long period of time, it is excellent. Sticking stability can be obtained. According to the above (6), when the film is peeled from the window, the adhesive strength is surely lowered when the pressure-sensitive adhesive is heated to a predetermined temperature, so that the film can be easily peeled without damaging the surface of the window. it can. According to said (7), even if the window film of this invention is stuck on a window, the visual field of a window is securable.

  Since the window film of the present invention can prevent the window from being broken and can prevent the broken window from scattering, it can be used as a film for preventing scattering or a film for crime prevention.

<Film for windows>
The window film of the present invention is coated on one side of a base film with a temperature-sensitive adhesive that exhibits fluidity at a temperature higher than the melting point higher than the surface temperature of the adherend window and crystallizes at the window surface temperature It is a thing.

  Here, the temperature-sensitive adhesive in the present invention means an adhesive that reversibly causes a crystalline state and a fluid state in response to a temperature change. The temperature-sensitive adhesive of the present invention needs to exhibit fluidity at a temperature equal to or higher than the melting point higher than the surface temperature of the window that is the adherend and crystallize at the surface temperature of the window.

  Specifically, the melting point of the thermosensitive adhesive is 30 to 70 ° C., preferably 40 to 60 ° C., and it is preferable to crystallize below the melting point. By setting the melting point of the temperature-sensitive adhesive within this range to be higher than the window surface temperature, the temperature-sensitive adhesive has no adhesive force at the window surface temperature, so positioning can be simplified and And bubbles can be removed easily. And when heated to a temperature higher than the melting point higher than the surface temperature of the window, the pressure-sensitive adhesive changes phase from a crystalline state to a fluidized state, and when pressed in the fluidized state, it enters into a fine recess on the glass surface, and in this state, When the temperature is returned to the surface temperature, the anchor effect is exhibited in the process of crystallizing the thermosensitive adhesive from the fluid state, and high adhesive strength is exhibited.

  On the other hand, if the melting point of the temperature-sensitive adhesive is lower than 30 ° C., the temperature-sensitive adhesive is already in a fluid state at the window surface temperature, which may make alignment difficult. Moreover, since it becomes difficult for the said thermosensitive adhesive to phase change when the said melting | fusing point becomes higher than 70 degreeC, it is unpreferable.

  In the present invention, the melting point means a temperature at which a specific portion of a polymer that is initially aligned in an ordered arrangement is in a disordered state by a certain equilibrium process, and the thermosensitive adhesive is subjected to differential thermal scanning. It is a value obtained by measuring with a calorimeter (DSC) under measurement conditions of 10 ° C./min.

  In addition, the temperature-sensitive adhesive of the present invention includes acrylic acid ester or methacrylic acid ester having a linear alkyl group having 16 or more carbon atoms and acrylic acid having a C 2-8 alkyl group. The polymer is preferably a polymer obtained by polymerizing 20 to 70 parts by weight of an ester or methacrylic acid ester and 0 to 10 parts by weight of a polar monomer. This polymer may be either a homopolymer or a copolymer.

  Examples of the acrylic acid ester and / or methacrylic acid ester (hereinafter referred to as (meth) acrylate) having a linear alkyl group having 16 or more carbon atoms include cetyl (meth) acrylate, stearyl (meth) acrylate, eicosyl (meta ) One type or two or more types such as (meth) acrylate having a linear alkyl group having 16 to 22 carbon atoms such as acrylate and behenyl (meth) acrylate can be used. Examples of the (meth) acrylate having an alkyl group having 2 to 8 carbon atoms include one or two of ethyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and the like. More than seeds can be used. Examples of the polar monomer include carboxyl group-containing ethylenically unsaturated monomers such as acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, and fumaric acid; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl One or two or more types of ethylenically unsaturated monomers having a hydroxyl group such as (meth) acrylate and 2-hydroxyhexyl (meth) acrylate can be used, and among these, acrylic acid is particularly preferable. is there.

  The polymer may have a weight average molecular weight of 200,000 to 1,000,000, preferably 400,000 to 800,000. Thereby, a temperature sensitive adhesive comes to show high cohesion force, and the outstanding sticking stability is obtained. On the other hand, when the weight average molecular weight of the polymer is smaller than 200,000, the cohesive force of the pressure-sensitive adhesive is insufficient, and the sticking stability may be lowered. Moreover, when peeled off, there is a possibility that the adhesive remains in the window due to cohesive failure. On the other hand, if the weight average molecular weight exceeds 1,000,000, the cohesive force becomes higher than necessary, which is not preferable. The weight average molecular weight is a value obtained by measuring the polymer by gel permeation chromatography (GPC) and converting the obtained measurement value to polystyrene.

  In the film for windows of the present invention, the adhesive strength in a state of being stuck to a window exceeds 400 g / 25 mm in 180 ° peel strength. Specifically, the window film of the present invention in which the above-described temperature-sensitive adhesive is applied to a base film has no adhesive force at the window surface temperature, and the window surface temperature. When heated to a temperature equal to or higher than the melting point and pressure-bonded and returned to the surface temperature of the window, the 180 ° peel strength exceeds 400 g / 25 mm, preferably 1,000 g / 25 mm or more.

  As a result, since the film is securely adhered to the window surface, when the window film of the present invention is used as, for example, a crime prevention film, the window can be prevented from being damaged and scattered. When used as a protective film, the broken window can be reliably prevented from scattering. On the other hand, if the adhesive force is less than 400 g / 25 mm, it is difficult to prevent breakage and scattering of the window, which is not preferable.

  The adhesive force can be adjusted by selecting the (meth) acrylate or polar monomer, the thickness of a temperature-sensitive pressure-sensitive adhesive layer described later, the amount of crosslinking agent added, and the like. The 180 ° peel strength is obtained when, for example, as described below, the window film of the present invention is attached to a window by a predetermined method, and the film is peeled 180 ° at a speed of 300 mm / min using a load cell. It is a value obtained by measuring the intensity of

  As the substrate film, various known materials can be used as long as they can be used as a substrate for a window film, and specific examples thereof include synthetic resin films such as polyethylene terephthalate, polyurethane, and polyolefin. It is done.

  The thickness of the base film is, for example, 25 to 250 μm, preferably 50 to 100 μm. The surface of the base film is preferably subjected to, for example, corona discharge, blast treatment, chemical etching treatment, primer treatment, etc. in order to improve the fixing strength of the temperature sensitive adhesive.

  Furthermore, the base film according to the present invention may have various functions. Specific examples thereof include a function of blocking ultraviolet rays and a function of blocking heat rays to have a heat insulating effect. As a method for imparting these functions to the substrate film, various known methods can be employed. For example, a method for imparting a function of blocking ultraviolet rays by containing an ultraviolet absorber in the substrate film, a substrate film And a method of providing a function of blocking heat rays by forming a metal layer that blocks heat rays on at least one side.

  The manufacturing method of the film for windows of this invention can be produced by apply | coating the said temperature sensitive adhesive to the single side | surface of the said base film, and making it dry, for example. Here, the thickness of the formed temperature-sensitive adhesive layer is 5 to 100 μm, preferably 20 to 80 μm. Thereby, this film can be stuck to a window with a predetermined adhesive force. On the other hand, if the thickness is less than 5 μm, the adhesive force may be insufficient and adhesion stability may be reduced. If the thickness is more than 100 μm, bubbles are easily formed when applied to the base film, and the coating is applied. Further, the drying property of the adhesive layer is not preferable.

  The coating solution is, for example, an isocyanate-based compound or aziridine-based compound for improving cohesion, in addition to a temperature-sensitive adhesive made of a predetermined polymer, as a temperature-sensitive adhesive applied to one side of a base film. It is preferable to add a crosslinking agent such as a compound, an epoxy compound, or a metal chelate compound. Furthermore, you may add various additives, such as a tackifier, a plasticizer, anti-aging agent, and an ultraviolet absorber, as needed. As each additive, various known ones can be employed.

  The window film of the present invention preferably has a transmittance of 80% or more in the visible light region (400 to 800 nm). Thereby, the field of view of the window can be secured. The transmittance is a value obtained by measuring the window film with a visible spectrophotometer, for example.

  The window in the present invention means a glass plate. For this reason, the surface of the window may be either smooth or uneven, including those having a certain area that needs to be prevented from being damaged or scattered. The window may be transparent or opaque. Such windows include, for example, window windows of houses and buildings, glass doors, glass shelves, glass cases, etc., as well as windows of vehicles such as automobiles and trains. When the window film of the present invention is attached to such a window, the window can be prevented from being damaged or scattered.

<Attaching method>
Next, the method for attaching the window film of the present invention will be described. First, the temperature-sensitive adhesive layer of the window film is disposed at a predetermined position of the window. At this time, since the film has no adhesive force, the sheets do not stick to each other by mistake, and even if the sticking position is wrong, it can be freely moved and easily repaired. For this reason, even if the area of the window is large, positioning can be performed easily.

  Next, the film is stretched using a roller or the like, or air bubbles mixed between the film and the window are pushed out. As described above, since the film has no adhesive force, Can be in no state.

  In this state, when the temperature of the temperature-sensitive adhesive layer is heated to a temperature higher than the melting point higher than the surface temperature of the window, for example, with a dryer or a heat gun, the pressure-sensitive adhesive changes from a crystalline state to a fluid state. In that state, the window film is pressure-bonded to the window. Next, when the surface temperature of the window is returned, it is crystallized again to develop a predetermined adhesive force, and the film is adhered to the window.

  Since the film attached to the window as described above is attached with a predetermined adhesive force, it does not shift even if applied for a long period of time, and can exhibit excellent adhesion stability. Moreover, since it can prevent thru | or suppress the breakage | damage of glass and the breakage | damage of the glass piece, it functions as a film for scattering prevention, or a film for crime prevention.

On the other hand, when the film is peeled off, if the pressure-sensitive adhesive is heated to a temperature higher than the melting point higher than the surface temperature of the window, the adhesive strength is lowered, so that it can be easily peeled off without damaging the surface of the window. Specifically, it is preferable that the decreasing rate of the adhesive force calculated from the above formula (I) is 60% or more. Thereby, when the said adhesive is heated to predetermined temperature, the said adhesive force will fall reliably to such an extent that it can peel off this film easily. On the other hand, if the rate of decrease is less than 60%, the film may not be easily peeled off even if the pressure-sensitive adhesive is heated to a predetermined temperature.
In addition, the peeled film can be used repeatedly many times by performing the same operation as described above.

  Hereinafter, although a synthesis example and an Example are given and this invention is demonstrated in detail, this invention is not limited only to the following synthesis examples and Examples. In the following description, “part” means part by weight.

The copolymers used in the following examples and comparative examples are the following three types.
(Synthesis Example 1)
45 parts of behenyl acrylate (manufactured by NOF Corporation), 50 parts of butyl acrylate (manufactured by Nippon Shokubai Co., Ltd.), 5 parts of acrylic acid and 0.5 part of perbutyl ND (manufactured by NOF Corporation) are acetic acid. In addition to 230 parts of ethyl, they were mixed and stirred at 55 ° C. for 4 hours to polymerize these monomers. The obtained copolymer had a weight average molecular weight of 590,000 and a melting point of 46 ° C.

(Synthesis Example 2)
60 parts of behenyl acrylate (manufactured by NOF Corporation), 35 parts of 2-ethylhexyl acrylate, 5 parts of acrylic acid and 0.2 part of perbutyl ND (manufactured by NOF Corporation) in 230 parts of ethyl acetate respectively. In addition, they were mixed and stirred at 55 ° C. for 4 hours to polymerize these monomers. The obtained copolymer had a weight average molecular weight of 570,000 and a melting point of 49 ° C.

(Synthesis Example 3)
45 parts of butyl acrylate (manufactured by Nippon Shokubai Co., Ltd.), 50 parts of 2-ethylhexyl acrylate (manufactured by Nippon Shokubai Co., Ltd.), 5 parts of acrylic acid and 0.5 part of perbutyl ND (manufactured by Nippon Oil & Fats Co., Ltd.) These were added to 230 parts of ethyl acetate, mixed, and stirred at 55 ° C. for 4 hours to polymerize these monomers. The weight average molecular weight of the obtained copolymer was 660,000.

The copolymers obtained in Synthesis Examples 1 to 3 are shown in Table 1.

<Preparation of film for window>
A copolymer solution was prepared from the copolymer obtained in Synthesis Example 1 so as to have a solid content of 30% using ethyl acetate. Next, 0.2 parts of an aziridine compound (trade name “PZ-33”, manufactured by Nippon Shokubai Co., Ltd.) as a crosslinking agent was added to the copolymer solution with respect to 100 parts of the copolymer in terms of solid content. A warm adhesive composition was obtained. This temperature-sensitive adhesive composition was applied to one side of a substrate film (a polyethylene terephthalate film having a thickness of 50 μm) and dried to produce a window film having a 40 μm-thick temperature-sensitive adhesive layer formed thereon. .

  A temperature-sensitive adhesive composition was prepared in the same manner as in Example 1 except that the copolymer obtained in Synthesis Example 2 was used in place of the copolymer obtained in Synthesis Example 1. Next, using this temperature-sensitive adhesive composition, a window film having a 40 μm-thick temperature-sensitive adhesive layer was prepared in the same manner as in Example 1.

[Comparative Example 1]
A pressure-sensitive adhesive composition was obtained in the same manner as in Example 1 except that the copolymer obtained in Synthesis Example 3 was used instead of the copolymer obtained in Synthesis Example 1. Next, using this pressure-sensitive adhesive composition, a window film in which a pressure-sensitive adhesive layer having a thickness of 40 μm was formed was produced in the same manner as in Example 1.

<Evaluation of window film>
The window films obtained in Examples 1 and 2 and Comparative Example 1 were evaluated for 180 ° peel strength, sticking state, sticking stability, scattering prevention effect, and peelability. Each evaluation method is shown below, and the evaluation results are shown in Table 2.

(Evaluation method of 180 ° peel strength)
The surface on which the adhesive layer of each window film obtained above was formed was pressed against a glass plate having a surface temperature of 23 ° C., and the film was peeled 180 ° at a rate of 300 mm / min using a load cell. ° Peel strength was measured.
In addition, each film was pressed against a glass plate in the same manner as described above, the temperature was increased from 23 ° C. to 60 ° C. and pressure-bonded, then cooled to 23 ° C., and the 180 ° peel strength was measured in the same manner as described above. .

(Evaluation method of sticking state)
The state when each window film having a size of 50 cm × 100 cm obtained as described above was adhered to a glass plate was visually observed. In addition, the sticking conditions and evaluation criteria were set as follows.
Adhesion conditions Examples 1 and 2: After pressing against a glass plate having a surface temperature of 23 ° C, heating to 60 ° C and pressure bonding, the solution was cooled to 23 ° C.
Comparative example 1: It pressed and stuck on the glass plate of the surface temperature of 23 degreeC.
Evaluation criteria ○: Can be attached without generation of wrinkles and bubbles ×: Wrinkles and bubbles are generated

(Attachment stability evaluation method)
The state at the time of wiping the surface of each film stuck on the glass plate in the evaluation of the sticking state with a waste cloth containing water was visually observed. The evaluation criteria were set as follows.
Evaluation criteria ○: No deviation or peeling ×: Deviation or peeling occurs

(Evaluation method of scattering prevention effect)
This was carried out in accordance with JIS A 5759 (A method). The evaluation criteria were set as follows.
Evaluation criteria ○: Very small amount of scattered glass ×: Large pieces of glass are scattered

(Peelability evaluation method)
Each window film obtained above was adhered to a glass plate and then heated to 60 ° C., and then the 180 ° peel strength was measured. And the obtained measured value was applied to the said Formula (I), and the fall rate of the adhesive force was computed. The sticking conditions were stuck in the same manner as in the sticking state evaluation method. The 180 ° peel strength was peeled in the same manner as the 180 ° peel strength evaluation method.

  As is apparent from Table 2, it can be seen that the window films of Example 1 and Example 2 have no adhesive force at the time of positioning and are excellent in the sticking state. Moreover, the 180 degree peeling strength also showed a high value in the state stuck on the window, and the result which was excellent also in sticking stability was shown. Furthermore, it was excellent in scattering prevention effect and showed good results in releasability during reheating. On the other hand, in Comparative Example 1, the adhesive force is shown at the time of positioning, and it can be seen that the sticking state is bad. In addition, the peelability was inferior to Examples 1 and 2.

Claims (9)

A temperature-sensitive adhesive is applied to one side of the base film,
The temperature sensitive adhesive is
30 to 80 parts by weight of an acrylic ester or methacrylic ester having a linear alkyl group having 16 or more carbon atoms;
20 to 70 parts by weight of an acrylic ester or methacrylic ester having an alkyl group having 2 to 8 carbon atoms,
0 to 10 parts by weight of at least one selected from an ethylenically unsaturated monomer having a carboxyl group and an ethylenically unsaturated monomer having a hydroxyl group;
Is a polymer having a melting point of 30 to 70 ° C. obtained by polymerizing
The adhesive strength in a state where the surface temperature is pressure-bonded to the glass plate having a temperature equal to or higher than the melting point via the thermosensitive adhesive, and the surface temperature is cooled to 23 ° C. and attached to the glass plate is 300 mm / A window film characterized by having a 180 ° peel strength exceeding 400 g / 25 mm when the substrate film is peeled 180 ° at a rate of minutes . Window film of the 180 ° peel strength in a state where the surface temperature is pressed through the temperature-sensitive adhesive to a glass plate of 23 ° C. is claim 1, wherein 0 g / Ru 100mm der. The window film according to claim 1 or 2, wherein the polymer has a weight average molecular weight of 200,000 to 1,000,000. The temperature-sensitive adhesive, no adhesive strength at temperatures below the melting point of the polymer, after warming crimped to a temperature above the melting point of the polymer, and back to a temperature below the melting point of the polymer window film according to any one of claims 1 to 3 is stuck. The value of the 180 ° peel strength in the state adhered to the glass plate is A,
When the value of the 180 ° peel strength in the state in which the surface temperature of the glass plate is heated to 60 ° C. from the state attached to the glass plate is B,
The window film according to any one of claims 1 to 4 , wherein a rate of decrease in adhesive force calculated by applying A and B to the following formula (I) is 60% or more.

The window film according to any one of claims 1 to 5 , wherein the transmittance in the visible light region is 80% or more. The window film according to any one of claims 1 to 6 ,
Positioning by superimposing the surface temperature on the surface of the window having a temperature lower than the melting point of the polymer via the thermosensitive adhesive ,
Then, after the surface temperature and pressed to warm to a temperature above the melting point of the polymer, and characterized in that it stuck to the surface of the window by cooling the surface temperature to a temperature below the melting point of the polymer How to attach film for windows. Shatterproof film, characterized in that it consists of a window film according to any one of claims 1-6. A security film characterized by comprising a window film according to any one of claims 1-6.