TWI726876B - Surface protective film - Google Patents

Abstract

The surface protective film (10) of the present invention is a surface protective film for protecting the surface of an adherend selected from optical parts (20) or electronic parts, and is provided with: a substrate (11) , And the adhesive layer (12) provided on one side of the aforementioned substrate (11); the adhesive layer side surface (adhesive surface (15)) of the surface protective film, at least in the ring surrounding the central part (17) In the shaped area (16), a part is a strong adhesive part, and the other part is at least one of a weak adhesive part and a non-adhesive part whose adhesive force is lower than that of the aforementioned strong adhesive part.

Description

Surface protective film

This invention relates to a surface protective film attached to the surface of various optical parts or electronic parts to protect the surface.

In the past, when assembling electronic equipment and the like, it is widely known that various electronic components and optical components are unitized in advance and mounted on a board or the like. As such unitized optical parts and electronic parts, widely known are: camera modules, camera lens units, communication units, sensing units, motor units with vibrators, etc. When processing, assembling, inspecting, and transporting optical components and electronic components, a surface protective film is attached to prevent surface damage and dust adhesion.

The surface protection film is generally formed by providing an adhesive layer on one side of the substrate. The surface protection film is attached to the surface of the attached body such as optical parts and electronic parts by the adhesive layer, and at the same time protects the attached body Surface: When it is not necessary to protect the surface, peel off the surface protection film from the adherend.

In addition, optical components such as an image sensor module generally have a light-receiving portion composed of a lens or the like. Therefore, in order to prevent adhesive residue from the light-receiving part, Then, the part where the light-receiving part is attached to the surface protective film forms an uncoated part where no adhesive is applied (for example, refer to Patent Document 1).

In addition, it is known that an optical component includes a lens and a lens support component for supporting the lens, and the lens support component has an annular portion surrounding the lens. The surface protection film is used to attach the surface of the ring portion to such an optical component, thereby protecting the lens and the lens supporting component.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] JP 4116607 B

However, in recent years, with the progress of miniaturization and high-precision of optical parts, not only lenses, but also lens support parts are required to prevent adhesive residues. However, conventional adhesive sheets cannot sufficiently prevent the adhesive residues of lens support parts. .

In particular, the surface protection film is generally formed so as to be one circle larger than the ring portion, and covers the entire ring portion of the lens supporting part. Therefore, in general, the surface protection film is attached to the lens supporting part so as to protrude outside the outer peripheral portion of the annular portion. However, if the surface protective film is attached so as to protrude from the peripheral part of the lens support member, when the surface protective film is peeled off from the optical component, the peripheral part will have adhesive residue due to the pull of the adhesive. In addition, the inner periphery of the lens support parts will also have adhesive residue.

In addition, although various cover films are formed on the surface of the lens supporting part, the fragile cover film may be provided on the lens supporting part. Therefore, if the adhesive force of the surface protection film is too high, when the surface protection film is peeled off, even the cover film may peel off. Furthermore, when the surface protective film is peeled off from the lens supporting part, peeling failure may also occur.

In view of the above problems, the present invention provides a surface protection film, which can prevent adhesive residue on the surface of an adherend composed of optical parts or electronic parts, is not easy to produce peeling defects, and can appropriately protect the surface The film peels off from the adherend.

After discussion by the inventors, it was found that in the annular area surrounding the central part of the adhesive surface of the surface protective film, one part is a strong adhesive part, and the other part is a weak adhesive whose adhesive force is lower than that of the strong adhesive part. At least one of the part or the non-adhesive part can solve the above-mentioned problem, and thus the following invention is completed. That is, the present invention provides the following [1] to [12].

[1] A surface protective film attached to an optical component or electronic component to protect the surface thereof, comprising: a substrate, and an adhesive layer provided on one surface of the substrate; adhesion of the surface protective film On the side surface of the agent layer, at least in the annular area surrounding the central part, one part is a strong adhesive part, and the other part is at least one of a weak adhesive part and a non-adhesive part whose adhesive force is lower than that of the aforementioned strong adhesive part. By.

[2] The surface protection film as described in [1] above, wherein the adhesive layer is formed of an energy-ray curable adhesive, and at least one of the weakly adhesive portion and the non-adhesive portion is irradiated with energy rays. Consists of hardened parts.

[3] The surface protection film according to [1] or [2] above, wherein a part of the adhesive layer is provided on one surface of the base material, and the part where the adhesive layer is not provided becomes the non-adhesive portion .

[4] The surface protective film as described in any one of [1] to [3] above, wherein the surface of the surface protective film on the side of the adhesive layer has at least the annular region formed by the weakly adhesive portion And at least one of the non-adhesive part and the aforementioned strong adhesion part are alternately arranged in a pattern shape.

[5] The surface protective film according to any one of [1] to [4] above, wherein the surface of the surface protective film on the side of the adhesive layer has the weakly adhesive portion at least in the annular region At least one of the non-adhesive part and the aforementioned strong adhesive part are selected from: stripe shape, lattice shape, dot shape, shape formed by multiple wave lines arranged side by side, lattice pattern, and shape formed by side-by-side multiple patterns Arbitrary pattern configuration.

[6] The surface protection film described in any one of [1] to [5] above, wherein the weakly adhesive part and the non-adhesive part are provided on both the outer part and the inner part of the annular region At least one of the two forms a weak adhesion area or a non-adhesive area, and at the same time the strong adhesion part is provided in the middle part between the outer part and the inner part to become a strong adhesion area.

[7] The surface protection film as described in any one of [1] to [5] above, wherein one of the outer portion and the inner portion of the annular region is provided with a strong adhesion portion. While sticking to the area, at the same time Alternatively, at least one of the weakly adhered portion and the non-adhesive portion is provided to form a weakly adhered area or a non-adhesive area.

[8] The surface protection film as described in [6] or [7] above, wherein the weakly adhesive area has a pattern in which at least one of the weakly adhesive portion and the non-adhesive portion and the strong adhesive portion are alternately arranged shape.

[9] The surface protection film as described in [6] or [7] above, wherein the strong adhesion area has a pattern in which at least one of the weak adhesion portion and the non-adhesive portion and the strong adhesion portion are alternately arranged shape.

[10] The surface protection film according to any one of [1] to [9] above, wherein the optical component or electronic component has an annular portion; and the annular region of the surface protection film is adhered to the ring状部。 The state.

[11] A part with a surface protective film, comprising: one part selected from optical parts and electronic parts, and a surface as described in any one of [1] to [10] attached to the surface of the part Protective film.

[12] A surface protection method, which is to attach the surface protection film described in any one of [1] to [10] to the surface of an optical component or an electronic component, and to protect the surface.

The present invention provides a surface protective film, which can prevent adhesive residue on the surface of an adhered body composed of optical parts and electronic parts, is not easy to produce peeling defects, and can appropriately remove the surface protective film from the adhered body Peel off.

10‧‧‧Surface protective film

11‧‧‧Substrate

12‧‧‧Adhesive layer

15‧‧‧Adhesive surface (the surface on the side of the adhesive layer)

16‧‧‧Annular area

16A、16X‧‧‧Outer part

16B, 16Y‧‧‧Inner part

16C‧‧‧Middle part

17‧‧‧Central part

20‧‧‧Optical parts

21‧‧‧Lens

22‧‧‧Lens support parts

23‧‧‧Annular part

[Fig. 1] A schematic plan view showing the surface of the surface protective film on the adhesive layer side of the first embodiment.

[Fig. 2] A cross-sectional view showing the surface protection film attached to the adherend in the first embodiment.

[Fig. 3] A schematic plan view showing the surface of the surface protection film related to the second and third embodiments on the adhesive layer side.

[Fig. 4] A cross-sectional view showing the surface protection film attached to the adherend in the second and third embodiments.

[Fig. 5] A schematic plan view showing the surface of the surface protection film on the adhesive layer side of the fourth embodiment.

[Fig. 6] A cross-sectional view showing the surface protection film attached to the adherend in the fourth embodiment.

[Fig. 7] Fig. 7 is a plan view showing an example in which the arrangement pattern of the weak adhesion portion and the strong adhesion portion is a lattice shape in the fourth embodiment.

[Fig. 8] Fig. 8 is a plan view showing an example in which the arrangement pattern of the weak adhesion portion and the strong adhesion portion is a dot shape in the fourth embodiment.

[Fig. 9] Fig. 9 is a plan view showing an example in which the arrangement pattern of the weak adhesion portion and the strong adhesion portion is a shape in which a plurality of wave lines are arranged side by side in the fourth embodiment.

[Fig. 10] A plan view showing an example in which the arrangement pattern of the weak adhesion portion and the strong adhesion portion is a checkered pattern in the fourth embodiment.

[Figure 11] shows the adhesion of the surface protective film of the fifth embodiment A schematic plan view of the surface on the side of the agent layer.

[Fig. 12] A schematic plan view showing the surface of the surface protection film on the adhesive layer side of the sixth embodiment.

[Fig. 13] A schematic plan view showing the surface of the surface protection film on the adhesive layer side of the seventh embodiment.

Fig. 14 is a schematic plan view showing the surface of the surface protection film on the adhesive layer side of a modification of the fifth embodiment.

[Surface protection film]

The surface protection film of the present invention is attached to an attached body selected from optical components or electronic components to protect the surface. Hereinafter, the surface protective film of the present invention will be described in detail using the first to seventh embodiments.

(First Embodiment)

First, the surface protective film according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. As shown in FIGS. 1 and 2, the surface protection film 10 includes a base material 11 and an adhesive layer 12 provided on one surface of the base material 11.

(Substrate)

Although the material of the base material 11 is not particularly limited, it may be formed of, for example, a resin film. As a resin film, conventional materials can be used, but it can also be For use: polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, Polybutylene terephthalate film, polyurethane film, ethylene vinyl acetate film, ionic polymer resin film, ethylene. (Meth) acrylic copolymer film, polystyrene film, polycarbonate film, fluororesin film, polyimide, polyethylene naphthalene dicarboxylic acid and other films. In addition, as these crosslinked films, a laminated film in which two or more films are laminated can also be used.

In the present embodiment, a part of the adhesive layer 12 is as described later. When the energy ray is irradiated to harden it, it is preferable to use a material that is transparent to the wavelength of the energy ray as the base material 11. For example, when ultraviolet rays are used as the energy rays, it is preferable to use an ultraviolet-transmitting film for the substrate 11. However, when the energy ray is irradiated on the opposite side of the base material 11 and the adhesive layer 12 is not cured by the energy ray, the base material 11 does not need to be transparent to the energy ray.

Furthermore, in the work process, in order to be able to easily determine the presence or absence of adhesion of the surface protective film 10, one or both of the base material 11 or the adhesive layer 12 described later may be colored.

The thickness of the substrate 11 can be adjusted corresponding to the performance required of the surface protective film 10, preferably 10 to 300 μm, more preferably 30 to 150 μm.

(Adhesive layer)

The adhesive layer 12 is formed of an energy ray hardening adhesive or a non-energy ray hardening adhesive. The adhesive layer 12 is, for example, hardened by energy rays. The adhesive is formed, and a part of the adhesive layer 12 is hardened by the irradiation of energy rays, and the adhesive force to the adherend decreases. In this case, the surface of the surface protective film 10 on the side of the adhesive layer 12 (referred to as the "adhesive surface 15") is provided with a strong adhesive portion that is not irradiated by energy rays and maintains a high adhesive force state, and warp energy rays The weak adhesive part that hardens by irradiation and has a lower adhesive force than the strong adhesive part.

In addition, the adhesive layer 12 is not provided on a part of the adhesive surface 15 because the contact area with the adhesive adhered to the adherend is small, which may reduce the adhesive force. In this case, the adhesive surface 15 is provided with a strong adhesive part provided with an adhesive, and a non-adhesive part without an adhesive. When the adhesive layer 12 is not provided on a part of the adhesive surface 15, the adhesive layer 12 is usually formed of a non-energy ray hardening type adhesive, but it may be formed of an energy ray hardening type adhesive.

Energy-ray curable adhesive means that after the above-mentioned energy ray is irradiated, it will harden and reduce the peeling force. As the energy rays, specifically, ultraviolet rays, electron rays, etc. can be used, but it is preferable to use ultraviolet rays.

Although the adhesive used as an energy ray hardening adhesive is not particularly limited, it can be used: acrylic adhesive, rubber adhesive, silicone adhesive, polyester fiber adhesive, polyurethane adhesive, Polyolefin-based adhesives, etc., but are not limited to these, and can be appropriately selected from arbitrary materials. In addition, among them, acrylic adhesives are preferred.

In addition, the adhesive is usually: acrylic resin, rubber resin, silicone resin, polyester resin, polyurethane resin, polyolefin resin and other adhesive components (main polymer) are added, as necessary. Cross-linked It is composed of adhesive composition of additives such as fillers, adhesive agents, antioxidants, plasticizers, inorganic fillers, organic fillers, antistatic agents, flame retardants, colorants, ultraviolet absorbers, infrared absorbers, etc. Things. The above-mentioned filler does not matter whether there is a modifier or not, and the size is not limited. In consideration of dispersibility to the adhesive, the particle size is preferably 3 μm or less, and the addition amount is preferably 70% by mass or less with respect to the adhesive. In addition, the concept widely included in the adhesive component is that the adhesive component itself is not substantially adhesive, but through the addition of plasticizing components, adhesive polymers and the like are discovered.

Energy-ray curable adhesives generally contain photopolymerizable unsaturated group components. Although it is not particularly limited as an energy ray curable adhesive, for example, an X-type adhesive is used. The so-called X-type energy-ray curable adhesive refers to the introduction of photopolymerizable unsaturated groups into the main polymer (for example, acrylic polymer) of the adhesive (for example, the side lock of the main polymer).

In addition, the energy ray hardening adhesive may also be a Y-type energy ray hardening adhesive. The so-called Y-type energy-ray curable adhesive, unlike the main polymer (for example, acrylic polymer), refers to a compound having an energy-ray polymerizable compound having a photopolymerizable unsaturated group. Furthermore, as an energy-ray hardening adhesive, X-type and Y-type can also be used together. In other words, the energy-ray curable adhesive contains an energy-ray polymerizable compound, and a photopolymerizable unsaturated group may be introduced into at least a part of the main polymer.

In addition, the photopolymerizable unsaturated group is usually a group having a double bond, and a (meth)acryloyl group is preferred.

In addition, the energy-ray curable adhesive preferably contains photopolymerization Synthetic initiator. As photopolymerizable initiators, for example, photopolymerizable initiators such as benzoin compounds, acetophenone compounds, phosphine oxide compounds, titanocene compounds, thioxanthone compounds, peroxide compounds, etc., amines and Light sensitizers such as quinone; more specifically, for example: 1-hydroxyphenyl butanone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, benzoin, benzoin methyl ether , Benzoin ethyl ether, Benzoin isopropyl ether, 2,2-Dimethoxy-1,2-benzophen-1-one, biphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, etc. One or more of these photopolymerizable initiators can also be used in combination.

On the other hand, non-energy-ray-curable adhesives do not contain photopolymerizable unsaturated group components, and because they usually do not contain photopolymerizable initiators, they do not decrease the adhesive force even after energy rays are irradiated. The non-energy-ray hardening adhesive contains the above-mentioned adhesive components and, if necessary, the above-mentioned various additives.

The thickness of the adhesive layer 12 is not particularly limited, but is preferably 3-50 μm, more preferably 5-30 μm. Because the thickness of the adhesive layer is within the above range, the adhesion to the adherend can be easily improved.

The adhesive surface 15 is at least in the annular region 16, a part of which is a strong adhesive part, and the other part is a weak adhesive part or a non-adhesive part. In addition, the annular area 16 refers to an area other than the central portion 17 of the adhesive surface 15, that is, an area surrounding the central portion. Here, the central portion 17 is an area surrounded by a dotted imaginary line in FIG. 1.

In addition, in this specification, the strong adhesion part means the part with higher adhesion than the weak adhesion part or the non-adhesive part, but it does not mean that the absolute adhesion value is very high. high.

Hereinafter, this embodiment will be described in more detail. In the description of the following embodiments, the adhesive layer 12 is taken as an example and is formed of an energy-ray curable adhesive, and a weak adhesive portion is provided by energy-ray curing. However, it is not limited to this example, and is formed on a part of the adhesive surface 15 The adhesive layer 12 is not provided, and a non-adhesive part may be provided. Next, in the following description, the energy-beam-curable adhesive can be appropriately replaced by a non-energy-beam-curable adhesive, and the weakly-adhesive part can also be appropriately replaced by a non-adhesive part.

The weak adhesion portion is provided on both the outer portion 16A and the inner portion 16B in the annular region 16. On the other hand, the strong adhesion part is provided in the middle part 16C between the outer part 16A and the inner part 16B. Therefore, the outer portion 16A and the inner portion 16B are used as weak adhesion areas where the adhesion force of the area is lower than that of the middle portion 16C, and the middle portion 16C is used as the strong adhesion area where the adhesion force of the area is higher.

In more detail, the outer portion 16A is a ring-shaped area that constitutes the outer peripheral edge 15A of the adhesive surface 15. The adhesive layer 12 in this area is hardened and is formed by a weak adhesive portion. In addition, the middle portion 16C is a ring-shaped area connected to the inner periphery of the outer portion 16A, and the adhesive layer 12 is not hardened by energy rays, and is formed by a strong adhesive portion. Furthermore, the inner part 16B is a region connecting the inner periphery of the middle part 16C. Like the outer part 16A, the adhesive layer 12 is hardened and constituted by a weak adhesive part.

In addition, in this embodiment, the central portion 17 is formed by a weak adhesive portion like the inner portion 16B. Therefore, the inner area of the middle portion 16C The domains (that is, the central part 17 and the inner part 16B) are all composed of weak adhesion parts. However, the central portion 17 is not composed of a weak adhesive part, but may be composed of a strong adhesive part.

In addition, in this specification, the so-called central portion 17 is an imaginary area with arbitrary width that includes the geometric center of gravity when the adhesive surface 15 is viewed in plan. For example, it is defined as a range that is less than (a×r) when the center of gravity is centered. Any area within. Moreover, the so-called r means the distance from the center of gravity of the adhesive surface 15 to the outer peripheral edge 15A of the adhesive surface 15 in a plan view, and when the adhesive surface 15 is round, it is the radius. a is a positive number selected from a number greater than 0 but less than 1. a is preferably defined as 0.05 to 0.65, more preferably 0.1 to 0.6.

As described later, the ring-shaped area 16 is usually the area formed by the bonding surface of the adherend of the optical component or the electronic component. However, because a is defined below each upper limit, the ring-shaped area 16 is That is, the bonding surface can ensure a certain degree of area. Therefore, the adhesion of the surface protection film becomes good.

In this embodiment, the distance W1 from the periphery of the annular middle portion 16C to the center of gravity (that is, the outer diameter of the middle portion 16C/2) is the ratio (W1/r) to the above-mentioned distance r, preferably 0.4~ 0.95, more preferably 0.5 to 0.8. Because the ratio to the distance W1 is less than the above upper limit, it is easy to make the area of the weakly adhesive part (especially the outer part 16A) in the annular region 16 (that is, the adhesive surface) a certain size, which can easily Prevent the occurrence of poor peeling or adhesive residue. In addition, by setting it below the above lower limit, the area of the weakly adhesive part is less likely to be larger than necessary. The above size can prevent insufficient bonding.

In addition, the distance W2 from the outer periphery of the inner portion 16B to the center of gravity (that is, the outer diameter of the inner portion 16B/2) is the ratio (W2/r) to the aforementioned distance r, preferably 0.1 to 0.7, more preferably 0.15 ~0.65.

Since the ratio to the distance W2 is less than the above upper limit value, the strong adhesive force can easily ensure that the area where the adherend is attached has a certain size, and can easily prevent insufficient adhesion. On the other hand, by setting it above the above lower limit, due to the strong adhesive force, the area to be attached to the adherend can be prevented from being larger than necessary, and the occurrence of peeling failure or adhesive residue can be easily prevented.

The adhesive force of the adhesive layer 12 before hardening of the energy rays (that is, the adhesive force of the strong adhesive part) is preferably 800-16000 mN/25mm, more preferably 1000-10000 mN/25m, and still more preferably 1000-5000 mN/25mm. Since the adhesive force of the strong adhesive part is 800 mN/25 mm or more, the adhesive force to the optical components or electronic components of the surface protective film 10 is improved, and the protective performance becomes good. In addition, because the adhesive force is 16000mN/25mm or less, the adhesive force (that is, the adhesive force of the weak adhesive part) after hardening of the energy line can be easily adjusted to the desired size. The adhesive force before the energy ray is cured can be adjusted according to the type of adhesive component, the type and amount of functional groups of the adhesive component, and the amount of crosslinking agent used.

In addition, the adhesive force of the adhesive layer 12 after the energy line is hardened (that is, the adhesive force of the weakly adhesive part) is preferably 50-800 mN/25mm, more preferably 100-700 mN/25mm, and even more preferably 100-300 mN/25mm. Since the adhesive force after hardening of the energy rays is in this range, the adhesive force of the annular region 16 can be prevented from increasing, and the occurrence of adhesive residue can be prevented. In addition, the surface can also be The protective film 10 is peeled from the adherend with a relatively small force. Therefore, while improving the peeling performance, it is also possible to prevent peeling of the surface covering film provided on the optical component or the electronic component when the surface protective film is peeled off.

The adhesive force after energy ray hardening can be controlled by the type or amount of the energy ray polymerizable compound, and the amount of unsaturated groups introduced into the adhesive component.

The above method of measuring the peeling force is specifically carried out by the following method.

The adhesive force before energy ray hardening (that is, the adhesive force of the strong adhesive part) is made with the same material and processing method as the surface protective film 10, and the adhesive sheet with the base material and the adhesive layer is made with a width of 25mm × a length of 250mm Cut it out as a sample, and stick it on the surface of the polycarbonate board with a 2kg roller at 23°C and 50% relative humidity. After standing for 20 minutes in an environment of 23°C and 50% relative humidity, at a tensile speed of 300mm/min and a peeling angle of 180°, the peeling force when the adhesive sheet is peeled from the adherend is measured, which is used as the energy line before curing Of adhesion.

In addition, the adhesive force after energy hardening (that is, the adhesive force of the weakly adhered part) is the same irradiation conditions when the sample is attached to the adherend and left for 20 minutes to form the weakly adhered part on the above-mentioned adhesive sheet. The energy ray is irradiated to the entire adhesive layer from the side of the base material, and then the measurement is performed using the same method as the adhesive force measurement before the energy ray hardening, as the adhesive force after the energy ray hardening.

In addition, in this specification, the "adhesive force as an area" means the adhesive force of the entire area. Therefore, the target area, such as the weak adhesion area of the fifth to seventh embodiments, is the weak adhesion portion and the strong adhesion portion In the case of mixing, the "adhesive force as the area" of the area (for example, the weak adhesion area) is: made with the same material and processing method as the surface protection film, and the same as the area (for example, the weak adhesion area) The pattern, and the sample (adhesive sheet) of the strong adhesion part and the weak adhesion part formed by the same method, and the adhesive force measured. The method of measuring the adhesive force is specifically carried out by the following method.

On the surface protection film, energy ray irradiation is used to form the desired pattern shape, the part that is not desired to be hardened by the energy ray is masked by a mask, and the energy ray irradiation is performed across the mask. Thereby, the part covered by the mask will not be irradiated by the energy ray, and the unshielded part will be irradiated with the energy ray to make a sample. In other words, some parts of the sample have strong adhesion parts and some parts have weak adhesion parts. This sample was cut into the size of the sample for adhesive force measurement described above, and the adhesive force measurement was performed in the same way as the adhesive force measurement method before energy ray hardening.

On the other hand, when the target area is a strong adhesion area or a weak adhesion area formed by a single unit of a strong adhesion portion or a weak adhesion portion, the adhesion force of the strong adhesion portion or the weak adhesion portion becomes the "adhesion force of the area" ".

In addition, as in the case of mixing the weak adhesion part and the strong adhesion part described later, the adhesion force of the weak adhesion area as the area is preferably 500~15000mN/25mm, more preferably 700~9000mN/25mm, and still more preferably 750~ 4500mN/25mm.

(Peeling piece)

In addition, a release sheet (not shown in the figure) is attached to the surface of the first adhesive layer 12 of the surface protection film 10, and it can also be protected by a release sheet. do As a release sheet, one side of a resin film such as polyterephthalic acid, polyethylene naphthalic acid, polypropylene, polyethylene, and paper substrate can be peeled off using a silicone-based release agent, a fluorine-based release agent, or an alkyd-based release. Releasing agent, polyolefin-based release agent, rubber-based release agent and other release agents are used for release treatment, but it is not limited to this. In addition, a plurality of surface protection films 10 may be provided on one release sheet having a sufficiently larger size than the surface protection film 10. When the surface protective film 10 is used, it is peeled from the release sheet and attached to the adherend.

(Surface protection film)

The surface protection film 10 is attached to an optical component or an electronic component for use as described above, but at this time, in the adhesive surface 15, at least a part of the annular area 16 becomes the adhesive surface for bonding the optical component or the electronic component . Thereby, the adhesive surface of the adherend of the adhesive surface protective film 10 may have both a weak adhesive part and a strong adhesive part.

Therefore, the high adhesive force can reduce the area of the adhesive surface (the area of the strong adhesion portion) of the adherend to which the adherend is adhered, and can suppress the adhesion to the adherend of the entire surface protective film 10 The rise can also suppress the adhesive residue.

When using the surface protection film 10, the annular region 16 can be bonded to the adherend, or the central part 17 can be adhered to the adhered object, or not to the adhered object. However, the part of the attached body corresponding to the central part 17 is the object of protection, that is, the center position of the optical parts or electronic parts, and lenses or various precision parts are often provided. Because the lens or various precision parts contact the adhesive, the adhesive will turn to stick, which is easy to produce defects State or degrade performance. Therefore, if the central part 17 does not contact the adherend, it is easy to produce a defective state in the optical component or the electronic component.

Therefore, for the surface protection film 10, as shown in, for example, FIG. 2, the central portion 17 may protrude on the side opposite to the adhesive surface 15 side. In this case, if the central portion 17 protrudes, it is possible to prevent the adhesives to various lenses or precision parts from turning over.

However, the surface protection film 10 may be formed in a flat shape. Even if it is formed into a flat shape, if the central part 17 and the inner part 16B are formed by a weak adhesive part, the adhesive in the central part 17 is not easy to transfer to the adherend, even if the contact lens or precision parts are adhered Body, it is not easy to produce bad conditions. In addition, when the parts of the adherend set corresponding to the position of the central portion 17 are provided at a position lower than the adhered surface such as the ring portion described later, the surface protective film 10 can be prevented from contacting even if it is flat. Attached body.

In order for the surface protective film 10 to be used as a protective film for miniaturized electronic parts and optical parts, it is better to use a small size. Specifically, the film area of the surface protection film 10 is preferably 20 cm ² or less. On the other hand, although the lower limit of the film area is not particularly limited, it is preferably 0.05 cm ² or more from the viewpoint of practicality and processability. In addition, the area of the film is more preferably 0.1 to 10 cm ² , and even more preferably 10 to 80 mm ^2.

In addition, the film area means the area of the base material 11, but when a part of the surface protection film 10 has irregularities as shown in FIG. 2, it is the area of the base material 11 viewed in a plan view.

Although the shape of the surface protection film 10 is not particularly limited, it can be viewed in a plan view. Therefore, it is a quadrangle such as a circle, an ellipse circle, a square, a rectangle, and a polygon other than a quadrangle.

(Method of manufacturing surface protective film)

Although the manufacturing method of the surface protection film 10 of this embodiment is not specifically limited, it can manufacture by the following method, for example.

First, the adhesive layer 12 is formed on the substrate 11. Specifically, if necessary, an energy-ray curable adhesive diluted with a suitable solvent can be coated on the release sheet with a predetermined dry film thickness, and then dried to form an adhesive layer, and then the adhesive is attached The agent layer is on the substrate. In addition, if necessary, the energy-ray curable adhesive diluted with an appropriate solvent can be directly applied to the substrate, and then dried to form an adhesive layer.

After that, a weak adhesive portion is formed in the adhesive layer 12. Although the formation of the weak adhesion part is not particularly limited, for example, a mask with a uniformly shaped opening in the weak adhesion part or a shading member with a uniformly shaped shading part in the strong adhesion part can be used from a conventional irradiation device Irradiate energy rays to the adhesive layer 12. The energy ray may irradiate the adhesive layer 12 from the side of the substrate 11 with the substrate 11 interposed therebetween, or may be irradiated from the side opposite to the substrate 11. When irradiating from the opposite side of the base material 11 and the adhesive layer 12 is protected by a release sheet, the energy ray irradiates the adhesive layer through the release sheet.

In addition, a surface protective film partially coated with an adhesive can be formed by screen printing or inkjet printing to form a non-adhesive part while forming a strong adhesive part.

In addition, before or after the formation of the weak adhesion part, punching can be carried out. hole. Punching can be performed, for example, on a laminate of the base material 11 and the adhesive layer 12 provided on the release sheet, and the shape of the surface protection film 10 can be made the above-mentioned circular shape by the punching. In addition, it is also possible to form suitable irregularities on the surface protective film 10 by molding press or the like at any timing.

(Optical parts or electronic parts)

As an optical component or electronic component protected by the surface protective film 10, it can be: a camera module (such as a camera module (e.g., , Camera module); lens unit that supports multiple lenses on lens support parts such as lens barrels; light-emitting element units with light-emitting elements such as LEDs; motor units such as vibrators; communication modules, sensor modules, etc. .

In addition, the so-called optical components refer to optical components that have the function of receiving light, emitting light, or transmitting light. Specific examples of optical components include the above-mentioned camera module, lens unit, light-emitting element unit, and communication module that transmits or receives optical signals. Group, light sensor module, etc. In addition, the so-called electronic components usually refer to at least one part of a circuit, electronic components that transmit or receive electrical signals, electronic components that process electrical signals, electronic components that are actuated by electrical signals or electricity, etc.; as electronics Specific examples of parts include the aforementioned camera modules, light-emitting element units, motor units such as vibrators, communication modules that transmit or receive optical signals, and various sensor modules. In addition, communication modules, light sensor modules, camera modules, and light-emitting element units that transmit or receive optical signals generally belong to electronic parts as well as optical parts.

In addition, the optical component or the electronic component is preferably, for example, the above-mentioned electronic component or optical component is contained in a package or a frame, or is supported by a supporting component. In addition, it is preferable that a part of an electronic element or an optical element is exposed on the surface, and a surface protection film is used, for example, to protect the exposed parts.

Specifically, the optical parts or electronic parts (also referred to as "parts with surface protection film") attached to the surface protection film 10 are processed, installed on other parts, inspected, or transported. The surface protection film 10 protects the surface of the adherend composed of optical parts or electronic parts in these processes. In addition, when the surface protection film 10 does not need to be protected on the attached bodies, it can be peeled and removed from the attached bodies.

Hereinafter, an example of the usage method of the surface protection film 10 used for attaching the surface protection film 10 of this embodiment to the optical component 20 shown in FIG. 2 is demonstrated.

Here, the optical component 20 is a lens unit, a camera module, or the like, and includes at least a lens 21 that constitutes a light-receiving unit and a lens support component 22 that supports the lens 21. The lens supporting part 22 has an annular portion 23 provided around the lens. Although the materials of the lens support part 22 and the ring portion 23 are not particularly limited, in order to meet the recent requirements for the miniaturization and weight reduction of equipment, it is preferable to use a lightweight and high-strength material. Furthermore, in order to achieve various performance requirements such as concealment, light absorption, and light reflectivity of the optical component, a coating or covering film may also be provided on the surface of the lens supporting component 22, such as the front surface of the ring portion 23.

The ring portion 23 is annular in FIG. 2, but it is not limited to an annular shape, and it may also be a quadrangular shape such as an elliptical ring, a square, a rectangle, etc., or other than a quadrangular shape. The polygonal shape, or other circular shapes. In addition, the annular portion 23 is a component having a certain height, and the outer peripheral portion 23A and the inner peripheral portion 23B each constitute the outer peripheral surface and the inner peripheral surface of the lens supporting component 22.

The ring-shaped area 16 in the surface protection film 10 is attached to the optical component 20 by bonding the front surface 23F of the ring-shaped portion 23. The surface protection film 10 pasted in this manner protects the ring portion 23 and the lens 21 arranged inside the ring portion 23.

In addition, the surface covering film 24 provided on the front face 23F of the annular portion 23, although the covering film is generally low in strength and fragile, the annular area 16 where the annular portion 23 is bonded has a strong adhesion portion and a weak adhesion portion, which is high Adhesive force reduces the area where the adherend is adhered. Therefore, even if the fragile surface cover film 24 is provided, peeling or the like when the surface protection film 10 is peeled off can be prevented.

The surface protection film 10 preferably has a shape corresponding to the attached body to be attached. In other words, if the adherend to which the surface protective film 10 is adhered has an annular ring portion 23 as shown in FIG. 2, the surface protective film is also preferably circular. In addition, if the ring portion 23 has a quadrangular ring shape, the surface protection film 10 preferably has a quadrangular shape.

Therefore, because the surface protective film 10 has a shape corresponding to the attached body, the optical component 20 can be protected more efficiently by the surface protective film 10.

In addition, in order for the surface protective film 10 to make the front surface 23F (attachment surface) of the annular portion 23 of the adhered surface completely covered by the surface protective film 10, the surface protective film 10 is larger than the periphery of the front surface 23F of the annular portion 23 One lap is better. If you use a surface protective film 10 of this size In other words, when the surface protection film 10 is attached to the adherend, even if there is some positional deviation, the surface protection film 10 can protect the entire front surface 23F of the ring portion 23.

In addition, as shown in FIG. 2, the surface protection film 10 has an outer portion 16A composed of a weak adhesive portion on the outer peripheral portion 23A of the ring portion 23, and an inner portion 16B composed of a weak adhesive portion is placed on The method of attaching to the inner peripheral portion 16B of the ring portion 23 is preferably attached to the optical component 20.

When the surface protection film 10 is peeled off from the optical component 20, although the adhesive layer 12 may touch the outer peripheral portion 23A or the inner peripheral portion 23B of the ring portion 23, the outer portion 16A and the inner portion 16B are hardened by energy rays It is formed by the weakly adhesive part of, even if the adhesive layer 12 is pulled, it is difficult to produce adhesive residue. On the other hand, since the middle portion 16C composed of the strong adhesive portion adheres to the front surface 23F of the ring portion 23, the adhesiveness to the ring portion 23 of the surface protection film 10 can be improved.

In addition, although FIG. 2 illustrates that the adherend to which the surface protective film 10 is adhered is an optical component 20 having a lens 21, other forms of optical components and electronic components may also be used. However, as described above, it is preferable that the body to be adhered has an annular portion provided to surround a part to be protected such as a lens. With this structure, the ring and the parts to be protected can be appropriately protected.

According to the surface protection film 10 of the first embodiment described above, it is possible to prevent the adhesive residue from being generated on the surface of the optical component or the electronic component of the adherend. In addition, the cover film 24 on the surface of the adherend will not be peeled off The surface protection film 10 can be appropriately peeled off from the adherend without causing peeling failure.

(Second Embodiment)

Figures 3 and 4 show a surface protective film according to a second embodiment of the present invention. Hereinafter, the difference between the surface protection film of the second embodiment and the first embodiment will be described. In addition, the detailed description of each component omitted in the second embodiment is the same as that of the first embodiment. In addition, in each embodiment described below, the same reference numerals are used to describe corresponding parts.

In the first embodiment, the annular region 16 of the adhesive surface 15 includes: the outer part formed by the weak adhesive part, the middle part formed by the strong adhesive part, and the inner part formed by the weak adhesive part, but this embodiment In the form, the outer portion 16X of the ring-shaped area 16 becomes a weak adhesion area where a weak adhesion portion is provided, and the inner portion 16Y becomes a strong adhesion area where a strong adhesion portion is provided, and the ring area 16 is formed by these two areas.

In more detail, the outer portion 16X of the ring-shaped area 16 constitutes the outer peripheral edge 15A of the adhesive surface 15 and is a ring-shaped area, because the adhesive layer 12 in this area is hardened and formed by a weak adhesive portion. The inner portion 16Y is an area connecting the inner circumference of the outer portion 16X, and the adhesive layer 12 in this area is not hardened and is formed by a strong adhesion portion.

The central part 17 of this embodiment is formed by a strong adhesion part like the inner part 16Y. Therefore, the areas other than the outer portion 16X of the adhesive surface 15 (that is, the central portion 17 and the inner portion 16Y) are all constituted by strong adhesive portions. However, the central part 17 can not help but be strong It can be composed of a weak adhesion portion, or a mixture of a weak adhesion portion and a strong adhesion portion.

The ratio of the distance W3 from the periphery of the inner portion 16Y to the center of gravity (that is, the outer diameter of the inner portion 16Y) to the aforementioned distance r (W3/r) is preferably 0.1 to 0.7, more preferably 0.15 to 0.65. Since the ratio to the distance W3 is less than the above upper limit, it is easy to make the area of the weakly-adhesive part on the adhesion surface a certain size, and it is easy to prevent the occurrence of peeling failure or the occurrence of adhesive residue. In addition, by setting the distance W3 to be more than the above lower limit, the area of the weakly-adhesive portion is larger than necessary, and insufficient adhesion can be prevented.

Regarding the surface protection film 10 of this embodiment, as in the first embodiment, for example, the ring-shaped area 16 is bonded to the ring-shaped portion 23 and attached to the optical component 20. However, as shown in FIG. While the outer portion 16X formed by the portion is placed on the outer peripheral portion 23A of the ring portion 23, the ring-shaped area 16 is arranged on the inner portion 16Y formed by the strong adhesion portion on the inner peripheral portion 23B of the ring portion 23 In this way, it is better to stick to the ring portion 23. In this way, in the present embodiment, by forming the outer portion 16X disposed on the peripheral portion 23A with a weak adhesive portion, it is possible to more effectively prevent the adhesive residue caused by the adhesive layer 12 pulling the peripheral portion 23A.

(Third Embodiment)

Next, the difference between the surface protection film of the third embodiment and the second embodiment will be described. In addition, the detailed description of each part omitted in this embodiment is the same as in the second embodiment.

In the second embodiment, the outer portion 16X of the ring-shaped area 16 becomes a weak adhesion area constituted by a weak adhesion portion, and the inner portion 16Y becomes a strong adhesion area constituted by a strong adhesion portion, but in this embodiment, the outer portion 16X becomes a strong adhesion area constituted by a strong adhesion part, and the inner part 16Y becomes a weak adhesion area where a weak adhesion part is provided.

In this case, in this embodiment, the portions that become the strong adhesion area and the weak adhesion area are opposite to the second embodiment, but the annular area 16 of the surface protection film 10 in this embodiment also has both weak adhesion portions and strong adhesion portions. The ring-shaped area 16 is generally the same as described above, and is the bonding surface for bonding the adherend. Therefore, even when the surface protective film 10 of this embodiment is used, the peeling performance can be improved while the adhesive residue of the adherend can be suppressed.

Therefore, in the annular region 16 of this embodiment, the outer portion 16X composed of the strong adhesion portion is arranged on the peripheral portion 23A of the annular portion 23, and the inner portion 16Y composed of the weak adhesion portion is arranged as The method of attaching to the inner peripheral portion 23B of the ring portion 23 is preferably attached to the ring portion 23. In this way, in this embodiment, by making the inner portion 16Y disposed on the inner peripheral portion 23B formed of a weak adhesive portion, it is possible to more effectively prevent the adhesive residue caused by the adhesive layer 12 pulling the inner peripheral portion 23B. . That is, as in the first to third embodiments above, by making at least a part of the inner part or the outer part of the annular region 16 a weak adhesion region, it is possible to effectively prevent the adhesive residue on the annular part.

(Fourth Embodiment)

Next, the fourth embodiment of the present invention will be described with reference to Figs. 5-10. In addition, the detailed description of each component omitted in the fourth embodiment is the same as in the first to third embodiments. In addition, the blacked-out parts in Figs. 5 to 10 indicate the parts hardened by the irradiation of energy rays (that is, the weakly adhered parts).

In the above first to third embodiments, the entire area of a certain range (for example, the outer portion 16A of the ring-shaped area 16, etc.) is hardened to form a weak adhesion portion, but in this embodiment, the fine pattern shape Set up a weak adhesion part.

Specifically, as shown in FIGS. 5 and 6, the adhesive surface 15 includes a plurality of linear strong adhesive portions and a plurality of linear weak adhesive portions, and the strong adhesive portions and the weak adhesive portions are alternately arranged in a striped pattern.

In the fourth embodiment, the striped pattern is arranged across the entire adhesive surface 15 (that is, both the central portion 17 and the ring-shaped area 16). Next, the ring-shaped area 16 is also the same as in the above-mentioned embodiments. Set weak adhesion part and strong adhesion part. The ring-shaped area 16 is usually the same as the above-mentioned, the adhered body is adhered, and becomes the area of the adhesion surface. Therefore, the present embodiment can also prevent adhesive residues, without causing peeling of the cover film on the surface of the adherend, and peeling defects, and can appropriately peel the surface protection film from the adherend.

In addition, the adhesive surface 15 in the fourth embodiment does not need to provide the weak adhesive portion and the strong adhesive portion in a striped pattern, and may be arranged in another pattern. For example, as shown in Figure 7, it is also possible to arrange the weakly adhesive parts hardened by energy rays in the adhesive layer into a grid, and to place the grid The part between the pins is arranged in a grid pattern of strong adhesion parts. In addition, in the lattice-shaped pattern, the strong adhesion portion may be arranged in a lattice shape, and the weak adhesion portion may be formed in the portion between the lattices.

In addition, as shown in FIG. 8, it is also possible to disperse a plurality of dot-shaped weakly-adhesive parts on the adhesive surface 15 (the central part 17 and the annular area 16), and arrange a dot-shaped pattern composed of strong-adhesive parts in other parts. However, a plurality of dots in the dot pattern may be a strong adhesive part, and the other parts may be a weak adhesive part. In addition, in FIG. 8, the shape of the dot is shown as a circle, but it is not particularly limited to a circle, and various polygons such as an ellipse circle, a triangle, a square, a pentagon, etc. may be used, and other shapes may be used.

Furthermore, the strong adhesion portion and the weak adhesion portion may also form a pattern of a shape formed by arranging a plurality of wave lines side by side. That is, as shown in FIG. 9, it is also possible to arrange a plurality of wave lines formed by weak adhesion parts side by side, and make the part between them become strong adhesion parts, and arrange the strong adhesion parts and the weak adhesion parts on the adhesion surface 15. Alternatively, a plurality of wave lines formed by strong adhesion portions may be arranged side by side, and the portions between the waves may be weak adhesion portions, and the strong adhesion portions and the weak adhesion portions may be arranged on the adhesion surface 15. In addition, although the example in which the wave line is a rectangular wave line is illustrated in FIG. 9, it is not limited to a rectangular wave, a triangular wave, a sinusoidal waveform, etc. may be sufficient.

Furthermore, as shown in FIG. 10, the strong adhesion part and the weak adhesion part may be arrange|positioned in a checkered pattern.

Furthermore, various geometric patterns such as plural patterns can also be arranged in parallel. In this case, while various patterns are formed by the strong adhesive part, the other part may be formed by the weak adhesive part, and the other part may be formed by the strong adhesive part while the various patterns are formed by the weak adhesive part.

However, as shown in FIGS. 5 and 7 to 10, the adhesive surface 15 preferably has a pattern shape with a strong adhesive portion and a weak adhesive portion alternately arranged. If the strong adhesion part and the weak adhesion part are alternately arranged, the weak adhesion part will be clamped by the strong adhesion part, so it is not easy to cause poor adhesion caused by the weak adhesion part. In addition, because the strong adhesive part is sandwiched by the weak adhesive part, it is not easy to cause peeling failure caused by the strong adhesive part and peeling of the surface coating film during peeling.

In addition, in the fourth embodiment, the pattern of the strong adhesion portion and the weak adhesion portion is formed in the same manner as the method of forming the weak adhesion portion in the first embodiment described above. That is, for example, the strong adhesion part can be formed by irradiating the adhesive layer 12 with energy rays from a conventional irradiation device through a light-shielding member (the light-shielding member has a light-shielding portion composed of a pattern having a uniform shape).

In addition, a surface protective film partially coated with an adhesive can be formed by screen printing or inkjet printing to form a non-adhesive part while forming a strong adhesive part. By forming a pattern composed of a strong adhesion portion and a weak adhesion portion, peeling of the surface covering film can be better suppressed.

(Fifth Embodiment)

In the above fourth embodiment, the pattern composed of the strong adhesion portion and the weak adhesion portion is provided across the entire surface of the adhesive surface 15 (that is, both the central portion 17 and the annular area 16), but it does not need to be provided on The entire surface of the adhesive surface 15 may be provided on a part of the adhesive surface 15.

In addition, the fifth embodiment of this embodiment will be explained using FIG. 11 state.

In the fifth embodiment, as shown in FIG. 11, a pattern composed of a strong adhesion portion and a weak adhesion portion is provided in the outer portion 16A and the inner portion 16B of the annular region 16. On the other hand, the middle part 16C between the outer part 16A and the inner part 16B does not harden the adhesive layer 12 by energy rays and becomes a strong adhesive part. In other words, because the outer portion 16A and the inner portion 16B are areas where the strong adhesion portion and the weak adhesion portion are mixed, the adhesive force of the area becomes higher than that of the middle portion 16C (strong adhesion area) formed by the strong adhesion portion. Low weak adhesion area.

In this embodiment, the ring-shaped area 16 is the same as the first embodiment, and is arranged in order from the outside: the outer portion 16A formed by the ring-shaped weak adhesion area, and the middle portion formed by the ring-shaped strong adhesion area 16C. An inner portion 16B formed by a weak adhesion area provided on the inner side of the middle portion 16C.

Therefore, the surface protection film 10 of this embodiment is the same as the first embodiment. It prevents the adhesive residue from peeling off the coating film on the surface of the adherend and does not cause peeling defects. The surface protection film can be appropriately removed. Peel off from the attached body.

Furthermore, in this embodiment, as in the first embodiment, when the surface protective film 10 is attached to the adherend having the annular portion 23 (see FIG. 2), the outer portion 16A is arranged on the outer portion of the annular portion 23. At the same time as the outer part 23A, because the inner part 16B is arranged on the inner peripheral part 23B of the annular part 23, like the first embodiment, it can effectively prevent the adhesive residue generated in the inner peripheral part 23B and the outer peripheral part 23B. .

In addition, in this embodiment, although the central portion 17 is provided with a pattern composed of a strong adhesion portion and a weak adhesion portion, the pattern is not necessarily provided, and only one of the strong adhesion portion or the weak adhesion portion may be provided. However, since the central part 17 and the inner part 16B are composed of a pattern together, it becomes a weak adhesion area. Therefore, as in the first embodiment, it is possible to easily prevent the adhesion of the lens or precision parts corresponding to the position of the central part 17 Turn sticky.

In addition, when a pattern composed of a strong adhesion portion or a weak adhesion portion is provided on a part of the adhesive surface 15, the aspect is not limited to the fifth embodiment described above, and may be the sixth and seventh described below. The state of the implementation form.

(Sixth Embodiment)

In the sixth embodiment, as shown in FIG. 12, a pattern composed of a strong adhesion portion and a weak adhesion portion is provided in the outer portion 16X of the annular region 16. On the other hand, the inner portion 16Y of the annular region 16 is not hardened by the energy ray of the adhesive layer 12 but is formed of a strong adhesive portion. That is to say, in this embodiment, the ring-shaped area 16 is arranged in order from the outer part as in the second embodiment: the outer part 16X formed by the ring-shaped weak adhesion area, and the outer part 16X formed by the inner part of the outer part. The inner part 16Y formed by the strong adhesion area.

Therefore, the surface protection film 10 of this embodiment is the same as in the second embodiment. It prevents the adhesive residue and does not cause peeling and peeling defects of the coating film on the surface of the adherend. The surface protection film can be appropriately removed from The attached body is peeled off.

Furthermore, this embodiment is also the same as the second embodiment. When the surface protective film 10 is attached to the adherend having the annular portion 23, the outer portion 16X (weak adhesion region) is arranged on the annular portion 23. On the outer peripheral portion 23A, the adhesive residue generated in the outer peripheral portion 23A can be more effectively prevented (refer to FIG. 4).

In addition, in this embodiment, although the central portion 17 is composed of a strong adhesive part, it does not have to be composed of a strong adhesive part. It may be composed of a weak adhesive part, or a mixture of a strong adhesive part and a weak adhesive part may be provided. And constitute the pattern.

(Seventh embodiment)

In the seventh embodiment, as shown in FIG. 13, a pattern composed of a strong adhesion portion and a weak adhesion portion is provided in the inner portion 16Y of the ring-shaped area 16. On the other hand, the outer portion 16X of the annular region 16 is not hardened by the energy ray to harden the adhesive layer 12 but is constituted by a strong adhesive portion. That is to say, in this embodiment, the ring-shaped area 16 is arranged in order from the outer part as in the third embodiment: the outer part 16X formed by the ring-shaped strong adhesion area, and the outer part 16X is formed on the inner side of the outer part 16X The inner area 16Y formed by the weak adhesion area.

Therefore, regarding the surface protection film 10 of the present embodiment, since the strong adhesion portion and the weak adhesion portion are also provided in the ring-shaped area 16, while preventing the adhesive residue, the coating film on the surface of the adherend does not peel off and the peeling failure will not occur. , The surface protective film 10 can be peeled off appropriately from the adherend.

Furthermore, this embodiment is also the same as the third embodiment. When the face protection film 10 is attached to the body having the annular portion 23, because the inner portion 16Y (weak adhesion area) is arranged on the inner peripheral portion 23B of the annular portion 23, the occurrence of the inner peripheral portion 23B can be effectively prevented. Adhesive residue (refer to Figure 4).

In addition, in this embodiment, the central portion 17 is the same as the inner portion 16Y. Although a pattern composed of a strong adhesion portion and a weak adhesion portion is provided, it does not necessarily have to be constituted by a pattern. It is composed of a single strong adhesion portion or a weak adhesion portion. Body composition is also possible.

In the above fifth to seventh embodiments, the weak adhesion area and the strong adhesion area are provided. Although it is revealed that the weak adhesion area has a pattern formed by the weak adhesion portion and the strong adhesion portion, the strong adhesion area may also have A pattern composed of a weak adhesion part and a strong adhesion part.

In this case, as in the fifth embodiment, the outer portion 16A and the inner portion 16B of the weak adhesion area are formed, and then, when the middle portion 16C of the strong adhesion area is provided, for example, as shown in FIG. While the adhesive part forms the outer part 16A and the inner part 16B, the middle part 16C is formed by a pattern composed of a weak adhesive part and a strong adhesive part.

In addition, as in the sixth embodiment, the outer portion 16X and the inner portion 16Y are provided in the annular region 16 (refer to FIG. 12). When the outer portion 16X is a weak adhesion area and the inner portion 16Y is a strong adhesion area, for example, the outer portion The portion 16X is formed by a weak adhesion portion, and the inner portion 16Y is formed by a pattern composed of a weak adhesion portion and a strong adhesion portion. Similarly, as in the seventh embodiment, the outer portion 16X and the inner portion 16Y are provided in the annular region 16 (refer to FIG. 13). When the outer portion 16X is strongly adhesive When the inner portion 16Y is a weak adhesion area, for example, the outer portion 16X is formed by a pattern composed of a weak adhesion portion and a strong adhesion portion, and the inner portion 16Y is formed by a weak adhesion portion.

In addition, the fifth to seventh embodiments shown in Figs. 11 to 14 reveal a pattern composed of a weak adhesive part and a strong adhesive part, and have a stripe shape in which the linear weak adhesive part and the linear strong adhesive part are alternately arranged. However, the pattern is not limited to the stripe shape, and any pattern shape shown in the fourth embodiment may be used.

In addition, in the specific description of the first to seventh embodiments, although the energy ray hardening adhesive is used to partially harden the energy ray hardening adhesive, the weak adhesive part and the strong adhesive part are provided. It is not limited to this aspect.

For example, the adhesive is a non-energy-ray-curable adhesive, and the adhesive layer 12 may be provided on the surface protective film 10 part. Of course, the adhesive is an energy ray-curable adhesive, and the adhesive layer 12 may be provided on the surface protective film 10 part.

When the adhesive layer 12 is partially provided, a non-adhesive part is provided on the adhesive surface 15. However, in the above-described embodiments, the part of the weakly adhesive part is a non-adhesive part. Therefore, in the weak adhesion area of each of the above embodiments, in the first to third embodiments, the non-adhesive area becomes the non-adhesive area. In the fifth to seventh embodiments, the strong adhesion part and the non-adhesive area The pattern formed by the part becomes a weak adhesion area.

In addition, in each of the patterns described in the fourth to seventh embodiments above, the pitch of the pattern (that is, the distance between adjacent strong adhesion portions The interval, or the interval between adjacent weak adhesion parts or non-adhesive parts, is preferably 10 to 500 μm, more preferably 10 to 300 μm, and still more preferably 10 to 250 μm.

In other words, the width of each stripe, the width of each wave line and the interval between wave lines and wave lines become the width of each line of the grid, and the interval between adjacent lines that constitute the grid, the interval between points and the points The width and height of, or the height and width of each quadrangle forming the lattice pattern, are preferably 10 to 500 μm, more preferably 10 to 300 μm, and still more preferably 10 to 250 μm.

Furthermore, as in the fourth embodiment, when the entire adhesive surface 15 has a pattern (refer to FIGS. 5 to 10), the area occupied by the weakly adhesive or non-adhesive portion of the entire adhesive surface 15 is preferably 3 to 70%. It is more preferably 3~60%, and still more preferably 3~50%.

In addition, as in the fifth to seventh embodiments, when a pattern is provided in a part of the area of the adhesive surface 15 (for example, the weakly adhesive area) (refer to FIGS. 11 to 13), the weakly adhesive portion of the area (weakly adhesive area) or The occupied area of the non-adhesive part is also the same, preferably 3 to 70%, more preferably 3 to 60%, and still more preferably 3 to 50%. Similarly, when the pattern is set in the strong adhesion area (for example, refer to Figure 14), the area occupied by the weak adhesion portion or the non-adhesion portion of the strong adhesion area is also the same, preferably 3~70%, more preferably 3~60 %, more preferably 3~50%.

Furthermore, in the first to seventh embodiments described above, the weak adhesive part is formed by curing by energy ray irradiation, and although the part not irradiated with the energy ray becomes the strong adhesive part, the weak adhesive part and the weak adhesive part are formed by other methods. Strong adhesion part is also possible. For example, the weak adhesion part and the strong adhesion part are hardened by irradiation of energy rays. At the same time, by making the amount of energy ray irradiated to the weak adhesion part more than the energy ray irradiation amount to the strong adhesion part, the hardening rate of the weak adhesion part is higher than that of the strong adhesion part. It is also possible to form a strong adhesion part and a weak adhesion part.

Furthermore, in the first to seventh embodiments, although the part hardened by energy ray irradiation is a weak adhesive part that can be adhered to the adherend, it may be completely lost by energy ray hardening. The non-adhesive part of adhesion.

In addition, in each of the above embodiments, when the adhesive is an energy-ray curable adhesive, the surface protective film is irradiated with energy ray again during peeling. This hardens the adhesive in the strong adhesion part, making it more difficult to produce adhesive. Residue.

In addition, it is also possible to form a strong adhesive part, a weak adhesive part or a non-adhesive part by making the materials of the adhesive different from each other. Furthermore, it is also possible to form a weak adhesive part or a non-adhesive part by so-called paste killing (elimination of adhesive force). That is to say, on the upper part of the adhesive layer, a part of the low-adhesive material such as release agent or non-adhesive material is applied to make this part a weak or non-adhesive part, and the remaining part can also form a strong adhesive part. .

Furthermore, in the above description, although one of the weakly adhesive part and the non-adhesive part is formed in the surface protective film, it is also possible to mix and provide both the weakly adhesive part and the non-adhesive part. For example, the adhesive part may be applied to the adhesive surface 15 to form a part where no adhesive is provided (non-adhesive part), and only a part of the adhesive layer may be hardened by energy rays to form a weak adhesive part. In this case, the surface protection film, such as the first to seventh above In each of the aspects shown in the embodiment, a part of the weakly adhesive part is a non-adhesive part.

[Example]

Hereinafter, the present invention will be further explained based on examples, but the present invention is not limited to these examples.

In this example, the following method was used to evaluate the surface protective film.

[Evaluation of Adhesive Residue]

After aligning the center of the surface protection film approximately with the center of a circular flat polycarbonate plate with an outer diameter of 3.75 mm and an inner diameter of 2.37 mm, it was heated at 80°C for 5 hours. After that, the sample was returned to normal temperature, and the surface protective film was irradiated with ultraviolet rays under the irradiation conditions of 230 mW/cm ^{2 illuminance and 350 mW/cm 2} light intensity. Then, the end of the film was clamped with tweezers and peeled off at a peeling angle of 180°. Using an optical microscope (manufactured by Keyence Co., Ltd., trade name "VHX-200"), it was confirmed that the adhesive remained on the adherend after peeling.

A: The remaining area of the adhesive in the surface area of the adherend is less than 5%.

B: The remaining area of the adhesive in the surface area of the adherend is 5% or more but less than 15%.

D: The residual area of the adhesive in the surface area of the adherend is 15% or more.

[Bias Evaluation]

Using a 2kg rubber roller, a surface protection film with a width of 25mm and a length of 150mm is attached to the test plate (SUS304 steel plate) with an area of 25mm×25mm with an adhesive layer of 25mm×25mm, in accordance with JIS Z0237: 2000. The supporting force test is used as the criterion for evaluation.

A: It supports more than 70,000 seconds, and only produces a deviation of less than 1mm.

B: Support more than 70,000 seconds, but produce a deviation of more than 1mm.

C: Support more than 70,000 seconds, but produce a deviation of more than 3mm.

D: The sample dropped before 70,000 seconds.

[Film peeling evaluation]

A polycarbonate plate with an outer diameter of 3.75 mm and an inner diameter of 2.37 mm in the shape of a circular flat plate and a surface coated with titanium oxide was prepared as the adherend. After attaching the surface protection film to approximately the center of the surface of the adherend, heat it at 80°C for 5 hours. After that, the sample was returned to normal temperature, and the surface protective film was irradiated with ultraviolet rays under the irradiation conditions of 230 mW/cm ^{2 illuminance and 350 mW/cm 2} light intensity. Then, the end of the film was clamped with tweezers and peeled off at a peeling angle of 180°. The peeling of the adherend film after peeling was confirmed with an optical microscope (manufactured by Keyence Co., Ltd., trade name "VHX-200"), and the following evaluation criteria were used for evaluation.

1: The peeling area of the film in the surface area of the adherend is less than 5%.

2: The peeling area of the film in the surface area of the adherend is more than 5% Full 10%.

3: The peeling area of the film in the surface area of the adherend is more than 10% but less than 25%.

4: The peeling area of the film in the surface area of the adherend is more than 25% but less than 50%.

5: The peeling area of the film in the surface area of the adherend is more than 50%.

In the comparative example in each example, the adhesive composed of the following blends A and B was used as the adhesive.

[Example 1]

A 38μm thick polyethylene terephthalic acid (PET) release sheet (manufactured by Lintec Co., Ltd., trade name "SP PET381031") is coated with an adhesive compound A, and dried at 100°C for 1 minute to form an adhesive layer with a thickness of 10μm , Next, a substrate composed of a PET film (thickness: 50 μm, manufactured by Toyobo Co., Ltd., trade name "A4100") was bonded to the adhesive layer. After that, it was allowed to stand for 7 days in an environment of 23°C and 50% RH. Next, a light-shielding filter was placed on the substrate side of the produced sheet, and an ultraviolet irradiation device (manufactured by Lintec Co., Ltd., trade name "RAD-2000m/12") was used with an illuminance of 230mW/cm ² and a light intensity of 350mW/cm ² Irradiation conditions: UV irradiation was performed to harden the adhesive layer. After that, the obtained sheet was punched to obtain a circular surface protective film with a diameter of 5 mm, and the adhesive residue and film peeling were evaluated.

In addition, the light-shielding filter is a surface protection film as shown in FIG. 3, in which the outer part 16X is not cured by energy rays to form a strong adhesion part (strong adhesion area), and the inner part 16Y is cured by energy rays into a weak adhesion part (Weak adhesion area) shading. The outer diameter/2 (W3) of the inner portion 16Y is 1.42 mm.

In addition, the produced sheet was cut into a size of 25 mm in width and 150 mm in length, and used as an evaluation sample to evaluate deviations. However, the entire adhesion part of the sample for the deviation evaluation to the test plate is prepared so as to become a strong adhesion area (that is, a strong adhesion part (unhardened part)).

[Example 2]

Change the light-shielding part of the light-shielding filter to the surface protection film as shown in Figure 3, except that the outer part 16X is cured by energy rays to form a weak adhesion part, and the inner part 16Y is not cured by energy rays to become a strong adhesion part square Except for the formula, the same as in Example 1. The outer diameter/2 (W3) of the inner portion 16Y is 1.42 mm.

[Example 3]

Change the light-shielding part of the light-shielding filter, as shown in Fig. 1, except that the outer part 16A and the inner part 16B are hardened by energy rays to form a weak adhesion part, and the middle part 16C is not hardened by energy rays to become a strong adhesion. Except for the method of the part, the same as in Example 1. The outer diameter/2 (W1) of the middle portion 16C is 1.65 mm, and the outer diameter/2 (W2) of the inner portion 16B is 1.42 mm.

[Example 4]

The compounding of the adhesive used was carried out in the same manner as in Example 1, except that it was changed to compound B.

[Example 5]

Change the light-shielding part of the light-shielding filter to a surface protection film as shown in Figure 14, except that the entire outer part 16A and inner part 16B are cured by energy rays to form a weak adhesive part, and the middle part 16C is cured into a dot shape (refer to The pattern of FIG. 8) is the same as in Example 1, except for the circular dot-shaped weak adhesion portion (hardened portion) and the strong adhesion area formed by the strong adhesion portion (unhardened portion other than the dot). The outer diameter/2 (W1) of the middle portion 16C is 1.65 mm, and the outer diameter/2 (W2) of the inner portion 16B is 1.42 mm. In addition, the weak adhesion area is 10% of the entire strong adhesion area, The strong adhesion part is 90%.

In addition, in the sample for deviation evaluation, in order to make the entire adhesion part to the test board a strong adhesion area, that is, a circular dot-shaped weak adhesion portion (hardened portion) and a strong adhesion portion (other than the dots) The unhardened part) is formed.

[Example 6]

The light-shielding portion of the light-shielding filter was changed, and in the strong adhesion area, the weak adhesion portion was 20% of the entire strong adhesion area and the strong adhesion portion was 80%, and the same implementation was performed as in Example 5.

[Example 7]

The light-shielding portion of the light-shielding filter was changed, and in the strong adhesion area, the weak adhesion portion was 50% of the entire strong adhesion area and the strong adhesion portion was 50%, and the same implementation was performed as in Example 5.

[Comparative Example 1]

Except for the point where the adhesive layer was not hardened, the same operation as in Example 1 was performed.

It can be found from the results in Table 2 that in Examples 1-7, since at least a part of the annular region is used as a strong adhesive part and the rest is used as a weak adhesive part, it can maintain a good adhesive layer support while also It can prevent the adhesive residue when peeling off the surface protective film and the cover film of the adherend from peeling off. Furthermore, the peeling of the covering film of the adherend is the same as in Examples 5 to 7, and a part of the adhesive surface is a pattern composed of a weak adhesive portion and a strong adhesive portion, which can be more effectively prevented.

In contrast, in Comparative Example 1, because the ring-shaped area does not provide strong adhesion parts and weak adhesion parts, adhesive residue and film peeling will occur when the surface protection film is peeled off, which cannot meet the performance as a protection film for optical parts and electronic parts. .

10‧‧‧Surface protective film

11‧‧‧Substrate

12‧‧‧Adhesive layer

15‧‧‧Adhesive surface (the surface on the side of the adhesive layer)

16‧‧‧Annular area

16A‧‧‧Outer part

16B‧‧‧Inner part

16C‧‧‧Middle part

17‧‧‧Central part

20‧‧‧Optical parts

21‧‧‧Lens

22‧‧‧Lens support parts

23‧‧‧Annular part

23A‧‧‧Outer part

23B‧‧‧Inner periphery

23F‧‧‧Front

24‧‧‧Surface Cover Film

Claims (11)

A surface protection film attached to an optical component to protect the surface thereof, comprising: a substrate formed of a resin film, and an acrylic adhesive layer provided on one side of the substrate; and acrylic of the surface protection film The surface on the side of the adhesive layer, at least in the ring-shaped area surrounding the central part of the area centered on the center of gravity (a×r), one part is a strong adhesive part, and the other part has a stronger adhesive force than the aforementioned At least one of the weak-adhesive part and the non-adhesive part where the adhesive force of the strong adhesive part is low, where r means the distance from the center of gravity of the adhesive surface to the outer periphery of the adhesive surface in a plan view, and a is from 0 is larger but a positive number less than 1. At least one of the weak adhesion part and the non-adhesive part is provided on both the outer part and the inner part of the aforementioned annular area to form a weak adhesion area or a non-adhesive area. The middle part between the outer part and the inner part is provided with the strong adhesion part to form a strong adhesion area. The surface protection film according to claim 1, wherein the acrylic adhesive layer is formed of an energy-ray curable adhesive, and at least one of the weakly adhesive portion and the non-adhesive portion is cured by irradiation with energy rays Partly constituted. The surface protection film according to claim 1 or 2, wherein a part of the acrylic adhesive layer is provided on one surface of the substrate, and a part where the acrylic adhesive layer is not provided becomes the non-adhesive part. The surface protective film described in claim 1 or 2, wherein the aforementioned The surface of the surface protection film on the side of the acrylic adhesive layer has a pattern shape in which at least one of the weak adhesive portion and the non-adhesive portion and the strong adhesive portion are alternately arranged at least in the annular region. The surface protection film according to claim 1 or 2, wherein the surface of the surface protection film on the side of the acrylic adhesive layer, at least in the annular region, at least one of the weak adhesive portion and the non-adhesive portion and The strong adhesion part is arranged in any pattern selected from: a stripe shape, a lattice shape, a dot shape, a shape formed by a plurality of wave lines arranged side by side, a lattice pattern, and a shape formed by a plurality of patterns side by side. The surface protection film according to claim 1 or 2, wherein the weak adhesion area has a pattern shape in which at least one of the weak adhesion portion and the non-adhesive portion and the strong adhesion portion are alternately arranged. The surface protection film according to claim 1 or 2, wherein the strong adhesion area has a pattern shape formed by alternately setting at least one of the weak adhesion portion and the non-adhesive portion and the strong adhesion portion. The surface protection film according to claim 1 or 2, wherein the optical component has an annular portion; and the annular region of the surface protection film is adhered to the annular portion. The surface protection film according to claim 1 or 2, wherein the thickness of the base material is 10 to 150 μm. A part with a surface protection film, comprising: an optical part and a surface protection film as described in any one of Claims 1 to 9 attached to the surface of the part. A surface protection method, which is to attach the surface protection film described in any one of Claims 1 to 9 to the surface of the optical component and protect the surface surface.

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