JP5702072B2 - Laminated film for pasting windows - Google Patents

Description

  The present invention relates to a laminated film including a plastic film layer and a silicone rubber layer adsorbed on a window of glass, acrylic, or the like.

  A window pasting film for the purpose of shielding solar radiation and preventing glass scattering is used for windows of buildings. Recently, there are films that can shield infrared rays and the like, and have less discoloration due to sunlight, and window pasting films that have an adhesive intended to be peeled off without being left behind after being attached to window glass. The following documents can be cited as related to these.

  Patent Document 1 discloses that a film-forming resin containing acrylic resin (A) and saturated polyester-based resin (B) as main components on one surface of a biaxially oriented polyester film and 5 parts by weight with respect to 100 parts by weight of the film-forming resin. A film for window pasting is described in which a coating layer containing 40 parts by weight of an ultraviolet absorber (C) is formed and an adhesive layer is formed on the other side.

Patent Document 2 discloses a laminated film in which a pressure-sensitive adhesive layer (B) is provided on at least one surface of a plastic film (A), and the characteristics when the surface on the pressure-sensitive adhesive layer side of the laminated film is bonded to a glass plate. But,
(1) Normal adhesive strength is 300 g / cm or more.
(2) The deviation when measuring the holding force under the conditions of a load of 1 kg and a temperature of 80 ° C. is 3 mm or less after 1 hour.
(3) Adhesive strength after 6 hours after bonding to a glass plate after water spraying is 20% or more of normal adhesive strength.
(4) After bonding to a glass plate and maintaining at a temperature of 70 ° C. for 1 week, when it peels, 1 mm square size or more adhesive residue adhering to the glass plate is 1 or less per 100 cm ² ,
The laminated film for window pasting characterized by satisfying all the conditions is described.

  Patent Document 3 discloses a laminated film in which a biaxially oriented polyester film having weather resistance is used as a base material (A), and a heat ray reflective layer (B) and a surface protective layer (C) are provided on at least one side of the base material. And a heat ray reflective film suitable for outdoor use, wherein the laminated film has a visible light transmittance of 50% or more, a near infrared reflectance of 50% or more, and a haze value of 5% or less. Yes.

JP-A-10-250004 JP 2000-96009 A JP 2000-117918 A

  As mentioned above, since the window glass adhesive film has a function of preventing the window glass from scattering, it has a sufficient adhesive force with respect to the window glass. If it was not used, it could not be removed and it was difficult to handle. Moreover, even if it is a type of film that uses an adhesive, it can be affixed without leaving bubbles for general consumers because of its high adhesive strength for functions such as preventing window glass from scattering. It was difficult to peel off cleanly without remaining.

  The problem of the present invention is that it can be easily adsorbed by a general consumer who is not a craftsman or the like, especially on a window of a building or the like, and even if bubbles are generated at the time of adsorption, It is possible to provide a laminated film for window pasting that can be easily removed from the window without causing the remainder of the adsorbing layer or the adsorption mark, and having high weather resistance.

  The present inventors have found that the above problem can be solved by providing a laminated film that does not have adhesiveness or tackiness and adsorbs to a window, and has reached the present invention.

  According to the present invention, there is provided a laminated film for pasting a window, which includes a plastic film layer and a silicone rubber layer having an adsorption surface for a window.

  According to the laminated film according to the present invention, the silicone rubber layer in the laminated film does not have adhesiveness or tackiness, and adsorbs to the window, so that the silicone rubber layer can be easily adsorbed from the window without any adsorption residue or trace. Further, it is possible to obtain a laminated film having high weather resistance by using a silicone rubber layer.

FIG. 1 describes a laminated film according to the present disclosure. FIG. 2 describes a laminated film according to the present disclosure in which a metal layer is laminated on the silicone rubber layer side on a plastic film layer. FIG. 3 describes a laminated film according to the present disclosure in which a printed layer is laminated on the silicone rubber layer side on a plastic film layer. FIG. 4 describes a laminated film according to the present disclosure in which a printed layer is laminated on the plastic film layer on the opposite side of the silicone rubber layer side.

  Hereinafter, the present invention is disclosed in more detail for the purpose of illustrating typical embodiments of the present invention, but the present invention is not limited to these embodiments.

  The laminated film for pasting windows according to the present invention includes a plastic film layer and a silicone rubber layer having an adsorption surface with a window laminated on one side of the plastic film layer.

  According to the present disclosure, there is provided a laminated film for pasting a window including a plastic film layer and a silicone rubber layer having an adsorption surface for a window, and a metal layer is provided between the plastic film layer and the silicone rubber layer. A laminated film for pasting windows is provided.

  Since this laminated film does not have adhesiveness or tackiness, even if bubbles are generated during adsorption, the bubbles can be easily removed by squeezing with a finger or the like. And since the laminated film does not have adhesiveness or tackiness even when peeled off from the window, it is possible to obtain a laminated film that can be easily peeled off from the window without any residue or trace of adsorption of the silicone rubber layer. It is.

In FIG. 1, sectional drawing of the laminated film for window pasting which concerns on this indication is shown. A silicone rubber layer 2 having a suction surface 21 with a window is laminated on one surface of the plastic film layer 1 and can be attracted to the window through the suction surface 21.
In FIG. 2, sectional drawing of the laminated film for window pasting which concerns on this indication different from the above is shown. A metal layer 3 is laminated on the plastic film layer 1 on the silicone rubber layer 2 side, and a silicone rubber layer 2 having an adsorption surface 21 with a window is further laminated.
In FIG. 3, sectional drawing of the laminated film for window pasting concerning another this indication is shown. A printed layer 4 is laminated on the plastic film layer 1 on the silicone rubber layer 2 side, and a silicone rubber layer 2 having an adsorption surface 21 with a window is further laminated.
In FIG. 4, sectional drawing of the laminated film for window pasting concerning another this indication is shown. On one side of the plastic film layer 1, a silicone rubber layer 2 having an adsorption surface 21 with a window is laminated, and on the surface of the plastic film layer 1 opposite to the silicone rubber layer 2, a printing layer 4 is laminated. Yes.

In the present specification, the following terms have the following definitions, respectively.
“Adsorption” means that the adhering matter is detachably integrated with the adherend without being adhered or sticking, and there is no cohesive failure of the adhering matter after peeling off the adhering matter.
“Adhesion” refers to pressure-sensitive adhesion and may be included in the adhesion.
“Transparent” means that the light transmittance is 90% or more in visible light, that is, in the wavelength range of 380 nm to 780 nm.

As the silicone rubber layer according to the present invention, those generally known as silicone rubber can be used without any particular limitation. In particular, as shown in detail below, the silicone rubber layer is obtained by mixing a silicone main ingredient containing reactive polydimethylsiloxane and the like and a crosslinking agent and curing them on a plastic film layer under a catalyst. Is sufficient, the adhesive force between the plastic film layer and the silicone rubber layer is sufficient, and the silicone rubber layer can be easily obtained. As a combination of the silicone main agent, the crosslinking agent and the catalyst, (i) a terminal hydroxyl group-containing polydimethylsiloxane and / or a copolymer of polydimethylsiloxane and polydiphenylsiloxane is used as the silicone main agent, and a polyfunctional -Si ( OCH ₃ ) ₃ type cross-linking agent, etc., condensation type (moisture curing type) using dibutyltin dilaurate or the like as catalyst, (ii) vinyl group-containing polydimethylsiloxane and / or polydimethylsiloxane and polydiphenylsiloxane Addition type using Si-H containing siloxane type crosslinking agent etc. as crosslinking agent, platinum catalyst etc. as catalyst, (iii) Terminal amine group containing polydimethylsiloxane and / or polydimethylsiloxane and polydiphenyl as silicone main agent Siloxane The copolymers, polyisocyanate-containing crosslinking agent as a crosslinking agent, may be mentioned three types of silicone polyurea type using dibutyltin dilaurate or the like as a catalyst.

  The weight average molecular weight of the silicone main agent is not particularly limited and can be about 50,000 or more, about 100,000 or more, about 200,000 or more, about 300,000 or more, about 2 million or less, about 1 million or less, about 500,000. Hereinafter, it can be about 400,000 or less. When the weight average molecular weight of the silicone main agent is about 300,000 or more and about 500,000 or less, it is suitable because it is easy to apply.

  The molar amount of the cross-linking agent used for one mole of the reactive group in the silicone base, that is, for example, the terminal hydroxyl group in the condensation type, the vinyl group in the addition type, or the terminal amino group in the silicone polyurea type is adsorbable after curing. Is not particularly limited, it can be about 0.5 or more, about 1.0 or more, about 1.5 or more, and can be about 3.0 or less, about 2.0 or less. .

  The molar amount of the crosslinking agent relative to 1 mol of the silicone main agent is about 0.5 to about 3.0 in the case of a condensation type or addition type so as not to leave as much as possible unreacted silicone main agent and crosslinking agent remaining after curing. If it is a silicone polyurea type, it is suitable that it is about 0.5 to about 1.5. Since the molar amount of the crosslinking agent with respect to 1 mol of the silicone base agent is about 1.0, it is preferable.

The degree of crosslinking between the silicone main agent and the crosslinking agent can be represented by the gel fraction of the silicone rubber layer after curing, as will be described in detail below.
In addition, when a silicone rubber layer contains the tackifier described below, this gel fraction does not include the content of the tackifier.

  The gel fraction can be about 90% or more, about 95% or more, about 98% or more, and if it is about 90% or more, it is suitable without leaving an adsorption mark on the glass surface after peeling, If it is 95% or more, it is more preferable.

  In the crosslinking reaction between the silicone main agent and the crosslinking agent, a catalyst can be used as necessary. In this case, the amount of the catalyst with respect to the silicone main agent and the crosslinking agent may be about 0.0001% or more, about 0.00015% or more, or about 0.001% or more by weight in the case of a condensation type or silicone polyurea type. About 3.0% or less, about 2.0% or less, or about 1.0% or less. If the addition type, about 1.0 ppm or more, about 2.0 ppm or more, It can be 5.0 ppm or more, and can be about 100 ppm or less, about 90 ppm or less, about 80 ppm or less.

  If the amount of the catalyst with respect to the silicone main agent and the crosslinking agent is 0.0001 to 3.0% for the condensation type or silicone polyurea type and 1 to 100 ppm for the addition type, the reaction proceeds sufficiently and changes over time. This is suitable because it does not impair the properties of the cured silicone rubber layer.

  The silicone rubber layer adsorbs regardless of the material of the window such as glass and plastic. For example, when it is affixed to a glass for window glass and measured as a laminated film for window pasting, JIS K6854 showing details of the measurement below. −1, the 90 ° peel test can be performed to have an adsorption force of about 0.01 N / m or more, about 0.05 N / m or more, or about 0.1 N / m. On the other hand, it can have an adsorption power of about 15 N / m or less, about 10 N / m or less, or about 5 N / m or less.

  The thickness of the silicone rubber layer is not particularly limited as long as peeling due to its own weight after adsorption does not occur, and the thickness after curing can be about 30 μm or less, about 25 μm or less, about 20 μm or less, In order to form a smooth silicone rubber layer on a surface with undulations or irregularities, it can be about 2.0 μm or more, about 3.0 μm or more, about 5.0 μm or more.

  The silicone rubber layer basically does not contain other additives and the like, but can contain additives described in the following plastic film layer and metal layer, if necessary.

The silicone rubber layer according to the present invention is substantially a tackifier known to those skilled in the art, that is, a substance for increasing the followability to the micro surface of the glass and the anchor effect, for example, by lowering the elastic modulus at room temperature. Not included.
However, generally used tackifiers can be added without particular limitation as long as the weather resistance, adsorbability and the like of the silicone rubber layer are not impaired. Specifically, examples of the tackifier include MQ resin.

MQ resins are, for example, _R 3 SiO- (M form) and _SiO 4 in the molecule - has the structure (Q body), usually, the weight average molecular weight of a 10,000 to 15,000 of solid resin, M form is 0.7 to 1.1 moles per mole of Q form. It can be used by being mixed and dissolved in a silicone main agent and then cured.

  The silicone rubber layer according to the present invention may contain a tackifier in an amount of about 15% or less, about 10% or less, about 5% or less, and about 0.1% or more, about 1% or more. it can. In addition, it is known that the commercially available general adhesive normally contains 50 weight% or more tackifiers, such as MQ resin.

  Even when the silicone rubber layer contains a tackifier, the thickness, tackiness, etc. of the silicone rubber layer can be adjusted within the range described for the silicone rubber layer without the tackifier.

  The silicone rubber layer is usually protected from deposits such as dust and dirt by the protective sheet described below, and can be satisfactorily adsorbed to the window. However, if necessary, water, a solvent, a surfactant or the like may be adsorbed after being applied to the window or the silicone rubber layer by spraying or the like.

  The material of the plastic film layer according to the present invention is not particularly limited, and for example, a film made of polyester, polyamide, polyolefin, polyvinyl chloride, polycarbonate, acrylic resin, fluororesin, or the like can be used.

  Moreover, the structure of a plastic film layer may take the multilayered structure of arbitrary layers by the co-extrusion etc. for the objective of suppressing a reflectance as needed.

  Among these, polyester, polycarbonate, acrylic resin, and polyolefin are suitable in terms of transparency, dimensional stability, economy, and the like. In particular, a polyester film is suitable in terms of transparency, economy, weather resistance, heat resistance, mechanical properties, and the like. In the case of a polyester film, a uniaxially stretched polyester film, a biaxially stretched polyester film, an unstretched polyester film, or the like can be used without particular limitation depending on the application.

  The thickness of the plastic film layer is not particularly limited as long as there is no problem in flexibility and the like, and can be about 200 μm or less, about 100 μm or less, about 50 μm or less, about 10 μm or more, about 20 μm or more, about 30 μm or more. Can be. If the thickness of the plastic film layer is about 30 μm or more and about 100 μm or less, handling at the time of adsorption to the window is easy and suitable.

  If necessary, the plastic film layer may further include an antistatic agent, a stabilizer, a lubricant, a cross-linking agent, an anti-blocking agent, an antioxidant, an ultraviolet absorber, an infrared absorber, a light blocking agent, and a design without any particular limitation. A coloring agent for imparting, a lubricant for improving handling during processing such as vapor deposition, and the like can be contained.

  In the plastic film layer, for example, by using an infrared absorber and an ultraviolet absorber in combination, the transmittance of ultraviolet rays and infrared rays can be lowered without lowering the transmittance of visible light. Furthermore, for example, by combining a plastic film layer having a multilayer structure with reduced surface reflectance with an infrared absorber and an ultraviolet absorber, the visible light transmittance is increased and only the infrared and ultraviolet transmittance is decreased. It is also possible.

The laminated film according to the present invention can have a metal layer and / or a metal compound layer on at least one surface of the plastic film layer for the purpose of reflecting infrared rays, ultraviolet rays, visible rays, and the like. When using a metal layer, it is generally known that the transmittance is flat or has absorption at a specific wavelength in the entire region from infrared rays to ultraviolet rays. A wide variety of metal layers can be used. As a metal compound constituting the metal layer, a metal or an alloy such as Au, Ag, Cu, or Al can be used. From the viewpoint of cost and reflectance, Al or an alloy thereof is preferable. In addition, as a metal compound constituting the metal layer, generally known ITO (a mixture of indium oxide with several percent tin oxide) or the like may be used. In addition, you may use 2 or more types of metal substances together as needed.
In particular, as shown in FIG. 2, it is preferable to have a metal layer between the plastic film layer and the silicone rubber layer because the metal layer is protected from rubbing and the like. Further, a rust preventive coating layer may be provided on the surface of the metal layer opposite to the plastic film layer side for the purpose of preventing oxidation of the metal layer.

  The light transmittance of the metal layer can be about 1% or more, about 10% or more, about 20% or more, and can be about 90% or less, about 80% or less, about 60% or less, 25% to 35% or 35% to 50% may be suitable.

  There is no restriction | limiting in particular about the processing method of a metal layer, For example, it can carry out by the generally used method of producing | generating a metal thin film, such as a vapor deposition method, sputtering method, plasma CVD method. Further, if necessary, such as imparting design properties, dry lamination of metal foil can be used.

  For example, as shown in FIGS. 3 and 4, the laminated film may include a single layer or a multilayer printed layer on the side of the silicone rubber layer on the plastic film layer and / or on the opposite side for the purpose of decoration.

  A known method such as screen, gravure, offset, ink jet, electrostatic coating or the like can be used for forming the print layer. Screen printing may be used in terms of applying a variety of commercially available weatherable inks. For example, if the printing layer is located between the plastic layer and the metal layer, the printing layer is less likely to lose color due to friction or the like.

  Conversely, if a printing layer is provided on the opposite side of the silicone rubber layer, for example, printing can be performed immediately before the laminated film is attached to the window, and timely, free announcements, product prices, etc. Printing or decoration can be performed.

  Moreover, you may include a coloring agent so that a pattern pattern etc. may be formed in a plastic film layer instead of printing on a plastic film layer.

  The laminated film can have a visible light transmittance of about 10% or more, about 30% or more, about 40% or more, and about 99.9% or less, except for a case where a colorant or the like is included. The visible light transmittance may be about 90% or less, about 80% or less, or about 60% or less.

  The laminated film can have a coating layer between the silicone rubber layer and the plastic layer for the purpose of increasing the adhesive strength between the silicone rubber layer and the plastic layer. In addition, in order to improve the applicability or adhesion of the silicone rubber layer to the plastic film layer or the like, the plastic film layer or the like may be subjected to chemical treatment or electric discharge treatment before application.

  In order to increase the scratch resistance and / or antifouling property of the outermost surface of the laminated film, a scratch resistant layer and / or an antifouling layer may be provided on the outermost surface of the plastic film layer or the printed layer of the plastic film layer. it can. Examples of the resin constituting the scratch-resistant layer and / or the antifouling layer include a thermoplastic resin and a thermosetting resin excellent in weather resistance applied by the same method as described in the section of the silicone rubber layer below. Examples of such resins include fluororesins, acrylic resins, polyvinyl alcohol resins, epoxy resins, unsaturated polyester resins, urethane resins, melamine resins, silicone resins, and acrylic silicone resins.

  Instead of providing the scratch-resistant layer and / or antifouling layer by application, a plastic film layer having a scratch-resistant layer and / or antifouling layer provided on the surface in advance can also be used.

  The protective sheet is laminated on the adsorption surface of the silicone rubber layer. In order to protect the adsorbing surface and prevent dust, dust and the like from sticking in the storage state of the laminated film for window pasting, it has functions such as dust proofing and antifouling. As the protective sheet, commercially available PET, PP, etc., having a thickness that does not cause problems such as flexibility, can be used without particular limitation.

  In addition, the silicone rubber layer according to the present invention is an adsorption layer, and the protective sheet does not particularly require properties such as peelability. Therefore, instead of using the protective sheet, the laminated film itself is wound in a roll shape. For example, the outermost surface itself such as a plastic film layer can be used as a protective sheet.

  As a processing method of a silicone rubber layer, as described above, a known method can be used. In particular, on the plastic film layer, the silicone main agent and the curing agent can be easily formed by curing with a catalyst at room temperature or under heating.

  The silicone rubber can be applied to the plastic film layer at any stage. If the viscosity of the silicone base is high, use a commonly used soluble organic solvent such as ethyl acetate or toluene, without any particular limitation, as long as it does not adversely affect the reaction between the silicone base and the crosslinking agent. Can be adjusted.

  As a method for applying a silicone solution containing a silicone main agent, a crosslinking agent, and a catalyst, any known method can be used. For example, rod coating method, comma knife coating method, roll coating method, blade coater method, spray coater method, air Knife coating method, dip coating method, kiss coating method, bar coating method, die coating method, reverse roll coating method, offset gravure coating method, myer bar coating method, gravure coating method, reverse gravure coating method, roll brush method, spray coating method, An impregnation method, a spin coating method, a curtain coating method, or the like can be used alone or in combination.

  When applying a silicone solution containing a silicone base agent, etc. on the plastic film layer, flame treatment or corona discharge treatment is applied to the surface of the plastic film layer as a pretreatment to improve adhesion and applicability as necessary. The adhesion between the silicone rubber layer and the plastic film layer can be strengthened by performing a physical surface treatment such as plasma discharge treatment or applying a primer or the like.

  Application of silicone solution containing silicone base agent, crosslinking agent and catalyst to plastic film layer may be applied directly to the film by the above-mentioned application method, or once applied on the protective sheet and dried to some extent. After that, the protective sheet and the plastic film layer may be bonded together to adhere the silicone rubber layer to the plastic film layer. The curing temperature and curing time at this time are preferably conditions that allow sufficient curing of the silicone rubber.

  Measurement of 90 ° peeling of laminated film: Measured according to JIS K6854-1. Specifically, a laminated film cut into a strip shape having a length of 200 mm and a width of 25 mm is adsorbed on a glass window glass having the same dimensions as the laminated film at room temperature and humidity, and 2 kg from above is adsorbed. The rubber roller was reciprocated once to adsorb the entire surface of the laminated film. Next, it is attached to a tensile tester (manufacturer name: Orientec Co., Ltd., product number: RTG-1225), and one of the laminated films is pulled at a speed of 50 mm / min in the direction of 90 ° from the film surface, and a tensile test is performed. The average value of the values obtained five times was taken as the adsorption force or adhesive force.

  Measurement of gel fraction: After immersing 0.5 g of a precisely weighed sample (W0 (g)) in 200 cc of toluene under room temperature room humidity for 24 hours to elute toluene-dissolved components from the sample Then, after taking out the insoluble component and washing with acetone, this insoluble component was set in a vacuum dryer (manufacturer name: Yamato Scientific Co., Ltd., model number: DP32) set at 100 ° C. under a pressure of 0.1 MPa for 1 hour. After drying, the weight of the insoluble component (referred to as W1 (g)) was precisely weighed and determined by the formula: gel fraction (%) = (W1 / W0) × 100.

Object to be adsorbed: In this embodiment, window glass (dimensions: 220 mm square, thickness: 3 mm, manufacturer name: Asahi Glass Co., Ltd., product number: FL3), and window acrylic (dimensions: 220 mm) larger than the sample. Corner, thickness: 3 mm, manufacturer name: Mitsubishi Rayon Co., Ltd., product number: acrylite) was used.
Tackifier: MQ resin (manufacturer name: Toray Dow Corning Co., Ltd., product number: BY15-701A) was used as a tackifier.

  Production method of laminated film: Under room temperature and room humidity, silicone main agent (Toray Dow Corning Co., Ltd., SD7226 (30 wt% solution of silicone resin in toluene)), curing catalyst-containing crosslinking agent for silicone (Toray Dow Corning ( Co., Ltd., SRX212), and ethyl acetate (Gordo Co., Ltd., industrial grade) as a diluent for facilitating coating are mixed at a ratio of 100: 0.6: 100 (weight ratio), respectively, and 15 wt% A silicone coating solution was obtained. Next, this solution is put in a solvent coater and applied on a plastic film layer at a coating speed of 30 m / min, and the solvent is evaporated and cured at 100 ° C. for 10 minutes to obtain a laminated film having a silicone rubber layer. After that, a protective sheet (30 μm thick OPP (Toray Industries, Inc., Trefan 30-2500)) was applied on the silicone rubber layer. Next, this laminated film with a protective sheet was cut into a width of 200 mm × 200 mm and a width of 25 mm × 200 mm for a peel test.

The following were used as the laminated film according to the comparative example.
A) Scotch Tint (registered trademark) manufactured by 3M Co., Ltd. Product number: RE87CLIS: A film in which a PET is coated with a metal oxide, and has an acrylic adhesive layer with an ultraviolet absorber added to the metal oxide layer. A commercially available product for preventing glass scattering. This film had an adhesive strength of 500 N / m in a 90 ° peel test, a gel fraction of 95%, and a visible light transmittance of 85%.
B) 3M Scotch Tint (registered trademark) product number: RE80CLIS: A commercial product for preventing glass scattering having the same structure as RE87CLIS but having a visible light transmittance of 81% and a solar radiation shielding function.
C) Scotch Tint (registered trademark) product number manufactured by 3M: RE18SIAR: Visible light transmittance, which is a film in which Al is vapor-deposited on the PET surface, and has an acrylic adhesive layer to which an ultraviolet absorber is added on the Al vapor-deposited layer Commercially available product for preventing glass scattering with 18% solar shading function. This film had an adhesive strength of 500 N / m in a 90 ° peel test and a gel fraction of 95%.

Example 1
According to the method for producing a laminated film, a PET film (Lumirror 50S10 (Toray Industries, Inc.)) having a thickness of 50 μm is used as a plastic film layer, and the thickness is 1.4 μm, 2.0 μm, 2.5 μm, 5.0 μm. , 25 μm, 30 μm, and 35 μm laminated rubber films having a silicone rubber layer were used. These laminated films were 0.3 N / m, 0.3 N / m, 0.3 N / m, 0.4 N / m, 0.7 N / m, 0.7 N / m, 0.7. The adsorption force was 7 N / m, and the gel fraction was almost equal 95% in all samples.

  When these 200 mm square samples were adsorbed on an acrylic window and a glass window, the silicone rubber layer having a thickness of 2.0 μm to 30 μm was caused by bubbles generated at the interface with the window. Was easily removed by squeezing with a finger, and adsorbed well without substantial visual defects. The film was re-applied 10 times. As in the first time, it was adsorbed satisfactorily with substantially no defects in appearance. After that, when the laminated film was peeled off, both acrylic and glass were peeled off cleanly without leaving adsorbed debris, adsorption traces, etc. on the surface to be adsorbed. When the silicone rubber layer having a thickness of 1.4 μm was exposed to an environment having an air temperature of 50 ° C. and a humidity of 85%, partial peeling occurred between the glass and the glass in 168 hours. In the case of the 35 μm thickness, the solvent was not sufficiently evaporated, and when the protective sheet was peeled off, part of the film was peeled between the plastic film layer and the silicone rubber layer.

Example 2
Example 1 Example 1 except that a PET film (50 Tetraite T = 18T (Oike Kogyo Co., Ltd.)) having an Al vapor deposition layer with a silicone rubber layer of 5 μm and a visible light transmittance of 18% was used. A laminated film obtained by the same procedure as above was produced. A sample having a size of 200 mm square is adsorbed on a glass window, and a thermometer is left at a distance of 10 cm from the sample in the center of the sample in an environment of room temperature 20 ° C. and room humidity. After standing for a minute, the temperature was measured and found to be 22 ° C.

Example 3
A laminate obtained in the same procedure as in Example 1 except that in Example 1, the thickness of the silicone rubber layer was 5 μm, and a tackifier was added at 10%, 15%, and 20% by weight. A film was used. These laminated films had the same gel fraction as in Example 1 and exhibited adsorption forces of 12 N / m, 18 N / m, and 20 N / m, respectively, in a 90 ° peel test. As in Example 1, when a peel test was performed on an acrylic window and a glass window, the same good results as in Example 1 were obtained when the tackifier contained 10% by weight and 15% by weight. However, in the case of 20% by weight, adhesion marks were visually confirmed.

Comparative Example 1
When the films a) to c) having a size of 200 mm square were pasted on the window glass, bubbles and wrinkles were generated, and good pasting was not possible. An attempt was made to peel off, but a part of the adhesive layer cohesively broken, leaving an adhesive on the window glass surface.

Comparative Example 2
Without attaching a laminated film for window pasting to a glass window, leave the thermometer at a position 10 cm away from the window in the center of the window at room temperature of 20 ° C and room humidity. After standing, the temperature was measured by the same procedure as in Example 1, and it was 36 ° C.
A 200 mm square film a) to c) above is pasted on a glass window, and the thermometer is left 10 cm away from the sample in the center of the sample in an environment of room temperature 20 ° C. and room humidity. Then, after standing for 15 minutes under sunlight, the temperature was measured in the same procedure as in Example 1. A) RE87CLIS and a) RE80CLIS having an infrared absorption layer were 34 ° C. and 32 ° C., respectively. RE18SIAR having an infrared reflective layer was 24 ° C.

As is clear from the above, the laminated film for window pasting according to this embodiment shown in the examples can be easily adsorbed to the window and has not only good adsorption / peeling property, but also silicone rubber after peeling. It has an excellent effect with no layer residue or adsorption marks.
(Aspect)
(Aspect 1)
A plastic film layer,
A silicone rubber layer having an adsorption surface with the window,
Laminated film for pasting windows.
(Aspect 2)
The said silicone rubber layer is a laminated film for window sticking of the aspect 1 whose content rate of a tackifier is 15 weight% or less.
(Aspect 3)
The laminated film for window pasting according to aspect 1 or 2, wherein the silicone rubber layer has a gel fraction of 90% or more.
(Aspect 4)
The laminated film for window pasting according to any one of modes 1 to 3, wherein the silicone rubber layer has a thickness of 2 to 30 µm.
(Aspect 5)
Any one of Embodiments 1 to 4, wherein the silicone rubber layer has an adsorptive power to the window glass of 0.01 N / m or more and 15 N / m or less in a 90-degree peel test in accordance with JIS K6854-1. The laminated film for window sticking of description.
(Aspect 6)
The laminated film for window pasting as described in any one of aspects 1-5 containing an infrared reflective layer.
(Aspect 7)
The laminated film for window pasting as described in any one of aspects 1-6 containing a printing layer.

DESCRIPTION OF SYMBOLS 1 Plastic film layer 2 Silicone rubber layer 21 Adsorption surface 3 Metal layer 4 Print layer

Claims (5)

A plastic film layer,
A silicone rubber layer having an adsorption surface with the window,
A laminated film for pasting a window,
The silicone rubber layer does not contain a tackifier,
The gel fraction of the silicone rubber layer is not less 9 8% or more,
A laminated film for window pasting, in which an adsorption force of the silicone rubber layer to a window glass exhibits an adsorption force of 0.1 N / m or more and 5 N / m or less in a 90-degree peel test based on JIS K6854-1.   The laminated film for window pasting according to claim 1 whose thickness of said silicone rubber layer is 2 micrometers-30 micrometers.   The adsorption force of the silicone rubber layer to the window glass shows an adsorption force of 0.3 N / m or more and 0.7 N / m or less in a 90-degree peel test in accordance with JIS K6854-1. The laminated film for window pasting of description.   The laminated film for window pasting as described in any one of Claims 1-3 containing an infrared reflective layer.   The laminated film for window pasting as described in any one of Claims 1-4 containing a printing layer.

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