KR20230052128A - Adhesive tape and jig cushion for camara module including the same - Google Patents

Abstract

The present invention relates to an adhesive tape and a jig cushion for a camera module including the same, wherein the adhesive tape includes a base layer containing PET, and an elastic layer including silicone foam, wherein the elastic layer has a density of 100 to 1000 kg/m^3.

Description

Adhesive tape and jig cushion for camera modules including it {ADHESIVE TAPE AND JIG CUSHION FOR CAMARA MODULE INCLUDING THE SAME}

The present invention relates to an adhesive tape including an elastic layer containing silicone foam, and relates to an adhesive tape that can be used as a carrier when assembling an electronic component module including a camera module.

The camera module is a component that converts the light signal coming into the lens into an RGB electric signal using an image sensor represented by CCD and CMOS and converts it into a screen or image, and is one of the key parts of small mobile devices.

In the camera module manufacturing process, an image sensor is manufactured, the manufactured image sensor is pressed and attached to a PCB (Printed Circuit Board), and then the image sensor and the PCB are connected with a wire. An infrared cut filter is pressed and attached to the upper surface of the image sensor. Fix the housing and lens barrel on the top of the PCB. After performing a focusing operation in the process of assembling the lens barrel to the housing, a bond is injected into a contact portion between the housing and the lens barrel, applied, and cured. After that, the PCB and FPCB (Flexible Printed Circuit Board) are connected.

When a manufacturer of a mobile device or camera module assembles a camera module including an auto-focusing step or performs a performance test of the assembled camera module, a jig cushion for the camera module having a certain elasticity is attached to the camera module and then performed.

Conventional jig cushions for camera modules include a release film, a PET-based double-sided tape, and an elastic layer, and acrylic foam, urethane foam, wet urethane foam, and the like are commonly used as the elastic layer.

Due to the characteristics of the elastic layer that comes into close contact with the camera module during transportation or performance testing, the raw material itself contains many foreign substances and has poor aging resistance. Contamination with foreign substances frequently occurs, resulting in deterioration of product quality. Wet urethane foam or acrylic foam partially solved the problem of dust generation, but the cost was excessive, or a multi-layered structure was adopted to reach the thickness required to manufacture a jig cushion for camera modules, and a number of adhesive layers needed to be additionally included.

As the adhesive layer increases in the jig cushion for camera modules, the occurrence rate of the layering phenomenon in which the adhesive surface separates during processing and transportation increases, or the possibility of lens contamination by foreign substances contained in the adhesive material increases, and a part of the adhesive layer moves to the side. Disadvantages such as an increase in the protruding phenomenon occur, resulting in an increase in the defect rate of the camera module product.

In order to solve this problem, Korean Patent Registration No. 2233133 uses the adhesive strength of the elastic layer composed of liquid silicone rubber (LSR) and laminated with the PET base layer to reduce the number of adhesive layers and the possibility of foreign matter in the elastic layer itself. wanted to reduce However, despite these attempts, the self-adhesiveness of the LSR is low, so layering may occur during the manufacturing process, and the elastic layer composed of LSR lacks the buffering ability, making it difficult to apply to the camera module assembly process.

Korean Registered Patent No. 2233133

The technical problem to be solved by the present invention is to improve the buffering function, reduce the generation of foreign substances, and prevent the absorption of the solvent in the solvent washing process by including an elastic layer containing silicone foam and a PET base layer. It is intended to provide an adhesive tape with

In addition, to provide a jig cushion for a camera module, including the adhesive tape, to reduce foreign matter generated in the adhesive layer and the elastic layer, and to provide a sufficient buffering function when assembling or inspecting the camera module.

An adhesive tape according to an embodiment includes a substrate layer including PET; and an elastic layer comprising silicone foam; and a density of the elastic layer of 100 to 1000 kg/m ³ .

A jig cushion for a camera module according to another embodiment includes one adhesive layer; A substrate layer containing PET; An elastic layer containing silicone foam; and 2 adhesive layers, and the elastic layer has a density of 100 to 1000 kg/m ³ .

The adhesive tape according to one embodiment of the present invention can improve the buffering function by including an elastic layer containing silicone foam and a PET base layer, and includes a silicone foam having a specific pore distribution and independent pore volume, thereby generating foreign substances. It can reduce and prevent the absorption of solvent in the solvent washing process.

The adhesive tape according to another embodiment of the present invention includes an elastic layer containing silicone foam and an elastic substrate layer to which a PET substrate layer is directly attached, thereby reducing the number of adhesive layers and preventing shape deformation of the elastic layer. Specifically, the elastic base layer of the present invention has a low elongation, so that the shape of the elastic layer hardly changes during or after punching, and foreign matter generated in manufactured products can be significantly reduced.

A jig cushion for a camera module including an adhesive tape according to an embodiment of the present invention can reduce foreign matter generated in the adhesive layer and the elastic layer of the adhesive tape and provide a sufficient buffering function.

1 shows a laminated structure of an adhesive tape according to an embodiment.
2 shows a laminated structure of the adhesive tape according to the embodiment when the adhesive tape is wound in a roll form.
3 shows the independent pore volume of the elastic layer of Example.
Figure 4 shows the results of measuring the pore distribution of the elastic layer of Example.
Figure 5 shows the results of measuring the pore distribution of the elastic layer of Example.

Hereinafter, the present invention will be described in more detail.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the following examples. However, the present invention is not limited to the embodiments disclosed below, but will be embodied in a variety of different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to completely inform the person who has the scope of the invention, and the present invention is only defined by the scope of the claims.

In the present specification, when each film, window, panel, or layer is described as being formed “on” or “under” each film, window, panel, or layer, (on)" and "under" include both formed "directly" or "indirectly". In addition, the criteria for the top/bottom of each component will be described based on the drawings. The size of each component in the drawings may be exaggerated for description, and does not mean a size actually applied. Also, like reference numerals designate like elements throughout the specification.

In this specification, when a certain component is said to "include", this means that it may further include other components, not excluding other components, unless otherwise stated.

In this specification, a singular expression is interpreted as a meaning including a singular number or a plurality interpreted in context unless otherwise specified. It should be understood that all numbers and expressions representing amounts of constituents, reaction conditions, etc. described herein are modified by the term "about" in all cases unless otherwise specified.

In this specification, terms such as first and second are used to describe various components, and the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

adhesive tape

Referring to FIGS. 1 and 2 , the adhesive tape 10 according to one embodiment of the present invention includes a base layer 4 including PET; And an elastic layer (3) containing a silicone foam; including, the density of the elastic layer (3) is 100 to 1000 kg / m ³ It is.

The adhesive tape 10 includes a first adhesive layer 5 on which the elastic layer 3 is disposed on one surface of the base layer 4 and the other surface of the base layer 4; and a second adhesive layer 1 disposed on one side of the elastic layer 3 on which the base layer 4 is not disposed.

The adhesive tape of the present invention includes a second adhesive layer (1); an elastic layer (3) attached to the lower surface of the second adhesive layer (1); a substrate layer 4 directly attached to the lower surface of the elastic layer 3; a first adhesive layer 5 attached to the lower surface of the base layer 4; and a release layer 6 attached to the lower surface of the first adhesive layer 5.

In the adhesive tape, the elastic layer 3 and the base layer 4 may be attached by an adhesive layer, or the elastic layer 3 and the base layer 4 may be directly attached.

Specifically, in the adhesive tape according to the embodiment, a separate layer is not interposed between the base layer 4 and the elastic layer 3, and the elastic layer 3 is formed on one surface of the base layer 4. It is characterized in that it comprises a directly attached elastic base layer (2). For example, the elastic base layer 2 may be an elastic base layer prepared by applying a silicone resin on the base layer 4 including PET and then foaming it.

In the adhesive tape, when the base layer and the elastic layer are directly attached, stress is prevented from being accumulated between the elastic layer and the base layer due to the property of the elastic layer that easily stretches when the adhesive tape is laminated, It is possible to prevent deformation of punched products with a small size.

Hereinafter, each layer of the present invention will be described in detail.

elastic layer(3)

The adhesive tape according to one embodiment of the present invention includes an elastic layer containing silicone foam.

The silicone foam is prepared from silicone rubber and a foaming agent, and the foaming agent may be a solid foaming agent or an inert gas.

When the silicone foam is included in the elastic layer and the elastic base layer, almost no foreign matter is generated in the foam itself, so that when the jig cushion for camera module is in close contact with the camera module, it is possible to prevent the lens from being contaminated by the foreign matter.

The elastic layer may have a density of 100 to 1000 kg/m ³ .

Specifically, the density of the elastic layer is 100 kg/m ³ or more, 150 kg/m ³ or more, 200 kg/m 3 or more, 250 kg/m ³ or more, 300 kg/m ^{3 or} more, 350 kg/m ³ or more , or 400 kg/m ³ or more, 1000 kg/m ³ or less, 900 kg/m ³ or less, 800 kg/m 3 or less, 700 kg/m ^{3 or} less, 600 kg/m ³ or less, or 500 kg/m ³ or less m ³ or less.

For example, the density of the elastic layer may be 300 to 1000 kg/m ³ , 250 to 800 kg/m ³ , 300 to 800 kg/m ³ , or 300 to 500 kg/m ³ , but is not limited thereto. no.

When the density of the elastic layer is within the above range, there is an effect of reducing assembly tolerance in the manufacturing process in the assembly process and inspection process of the camera module.

An average pore diameter of the elastic layer may be 0.01 to 0.6 mm.

Specifically, the average pore diameter of the elastic layer may be 0.01 mm or more, 0.03 mm or more, 0.05 mm or more, 0.1 mm or more, or 0.15 mm or more, 0.6 mm or less, 0.55 mm or less, 0.5 mm or less, 0.45 mm or less, or 0.4 mm or less. mm or less, 0.35 mm or less, 0.3 mm or less, 0.25 mm or less, or 0.2 mm or less.

For example, the average pore diameter of the elastic layer may be 0.01 to 0.5 mm, or 0.03 to 0.45 mm, 0.03 to 0.4 mm, 0.05 to 0.25 mm, or 0.1 to 0.2 mm, but is not limited thereto.

When the average pore diameter of the elastic layer is within the above-described range, less foreign matter is produced, and when the water washing process is performed, the permeation of moisture is reduced, thereby reducing contamination of the camera module.

The volume of pores in the silicone foam is 30 to 70% by volume based on the total volume of the elastic layer.

Specifically, the volume of pores in the silicone foam may be 40 to 60 vol% and 45 to 55 vol% based on the total volume of the elastic layer.

The elastic layer includes closed cells, and the volume of closed pores is 75 to 100% by volume based on the total pore volume.

Specifically, the independent pore volume of the elastic layer may be 75 to 100 vol%, 80 to 100 vol%, 90 to 100 vol%, 95 to 99.5 vol%, or 99 to 99.5 vol% of the total pore volume.

When the independent pore volume satisfies the aforementioned range, less foreign matter is generated during punching, and liquid is not absorbed during water washing or solvent washing, thereby reducing contamination of the camera module. In particular, when cleaning the camera module with a volatile gas such as Freon gas, the elastic layer may contain the volatile gas in the cleaning process when the number of independent pores is less than the lower limit of the above range.

The moisture absorption rate of the elastic layer may be 5% or less, and specifically, the moisture absorption rate of the elastic layer may be 4% or less, 3% or less, 2% or less, or 1% or less.

The average diameter of the independent pores is 0.01 to 0.55 mm as measured by a multi-functional biological microscope.

Specifically, the average diameter of the closed pores may be 0.01 mm or more, 0.03 mm or more, 0.05 mm or more, 0.1 mm or more, 0.15 mm or more, 0.55 mm or less, 0.50 mm or less, 0.40 mm or less, 0.35 mm or less, 0.3 mm or less. or less, 0.25 mm or less, or 0.2 mm or less.

For example, the average diameter of the closed pores may be 0.01 to 0.50 mm, or 0.03 to 0.45 mm, 0.03 to 0.40 mm, 0.05 to 0.25 mm, or 0.1 to 0.2 mm, but is not limited thereto.

When 25% of the total volume of the elastic layer is compressed, CFD (Compression Force Deflection) may be 100 to 1000 kPa.

Specifically, CFD at the time of 25% compression of the total volume of the elastic layer is 100 kPa above, 110 kPa above, 120 kPa 130 kPa or more, or 140 kPa or more, 1000 kPa or less, 800 kPa or less, 600 kPa or less, 400 kPa or less, 300 kPa or less, 250 kPa or less, or 200 kPa may be below.

For example, when 25% of the total volume of the elastic layer is compressed, the CFD may be 100 to 250 kPa, 100 to 240 kPa, or 120 to 180 kPa, but is not limited thereto.

When the CFD is within the above-described range when the elastic layer is compressed by 25% of the total volume, quality defects that may occur due to insufficient or excessive repulsive force of the elastic layer may not be accurately positioned due to insufficient or excessive repulsive force in the assembly and inspection process. .

The elastic layer may be composed of a single layer. Specifically, the elastic layer may be formed of a single layer rather than a stacked structure of several layers.

The elastic layer may have a thickness of 0.5 to 5.0 mm.

Specifically, the thickness of the elastic layer may be 0.5 mm or more, 0.8 mm or more, 1.0 mm or more, 1.5 mm or more, 2.0 mm or more, 2.5 mm or more, 3.0 mm or more, or 3.5 mm or more, 5.0 mm or less, 4.5 mm or less. or 4.0 mm or less.

The thickness of the elastic layer may be adjusted according to the application purpose of the adhesive tape.

In the case of wet foamed urethane with improved foreign matter generation, production costs are excessive when manufacturing a single layer with a thickness of 0.5 mm or more, and it is impossible to realize a thickness of 1.2 mm or more. The silicone foam of the present invention has the advantage of being able to implement the thickness required for the product with a single layer. In addition, in the case of wet foamed urethane, only a thickness of 0.8 to 3.5 mm can be implemented even during multi-layer lamination, so there is a limit to the thickness that can be implemented.

The tensile strength of the elastic layer may be 200 kPa or more.

Specifically, the tensile strength of the elastic layer may be 200 kPa or more, 300 kPa or more, or 400 kPa or more, and may be 1200 kPa or less, 1000 kPa or less, 800 kPa or less, or 600 kPa or less, but is not limited thereto.

The elongation of the elastic layer may be 40 to 100%.

Specifically. The elongation of the elastic layer may be 45 to 90%, 50 to 80%, or 60 to 70%.

Thermal conductivity of the elastic layer may be 0.03 to 0.14 W/(m·K).

Specifically, the thermal conductivity of the elastic layer is 0.03 W / (m K) or more, 0.04 W / (m K) or more, 0.05 W / (m K) or more, 0.07 W / (m K) or more, Or it may be 0.08 W/(m K) or more, 0.14 W/(m K) or less, 0.12 W/(m K) or less, or 0.11 W/(m K) or less, but is not limited thereto. no.

The heat resistance temperature of the elastic layer may be -55 to 250 °C or -55 to 200 °C.

A permanent set (compression set) of the elastic layer measured by ASTM D1056 at 100° C. may be 5% or less.

Specifically, the permanent set of the elastic layer may be less than 5%, less than 4%, less than 3%, less than 2%, less than 1.1% or less than 1%.

When the permanent set of the elastic layer falls within the above-mentioned range, it means that the physical stability of the elastic layer is secured, and when the permanent set is small, there is an effect of reducing the deviation of the position inside the camera module.

The elastic layer may have a hardness of 57 shore A or less, 52 shore A or less, or 47 shore A or less.

Elastic base layer (2)

An adhesive tape according to an embodiment of the present invention includes a substrate layer including PET; and an elastic base layer comprising; and an elastic layer comprising silicone foam.

The elastic base layer has a structure in which the elastic layer is directly attached on one surface of the base layer without a separate layer being interposed between the base layer and the elastic layer.

The elastic base layer may include the same physical properties as those of the elastic layer except for the following elongation and tensile strength.

The elastic base layer may have an elongation of 10% or less under a load of 500 g.

Specifically, the elastic base layer may have an elongation of 10% or less, 5% or less, 3% or less, 1% or less, 0.5% or less, or 0.2% or less under a load of 500 g, 0.05% or more, 0.07% or more, or 0.10 % can be

For example, the elastic base layer may have an elongation of 0.05 to 5%, 0.07 to 1%, or 0.1 to 0.2% at a load of 500 g, but is not limited thereto.

The elastic base layer may have an elongation of 10% or less, 5% or less, 3% or less, 1% or less, 0.5% or less, 0.3% or less, 0.05% or more, 0.10% or more, or 0.20% at a load of 1 kg. , but is not limited thereto.

The elastic base layer may have an elongation of 10% or less, 5% or less, 3% or less, 1% or less, or 0.5% or less, 0.1% or more, 0.2% or more, or 0.4% at a load of 1.5 kg. It is not limited.

The elastic base layer may have an elongation of 10% or less, 5% or less, 3% or less, 1% or less, 0.2% or more, 0.5% or more, or 0.8% at a load of 2 kg, but is not limited thereto.

When the elastic base layer has the above elongation rate under each load, shape deformation of the elastic layer can be prevented during the manufacturing process including adhesive layer lamination or punching process, and shape deformation even when attached to an assembly jig for camera module. can be prevented, thereby reducing the defect rate when assembling the camera.

The tensile strength of the elastic substrate layer may be 1000 kPa or more.

Specifically, the tensile strength of the elastic substrate layer may be 1000 kPa or more, 3000 kPa or more, 5000 kPa or more, 6000 kPa or more, or 6500 kPa or more, and may be 10000 kPa or less, 8000 kPa or less, 7000 kPa or less, or 6800 kPa or less. .

For example, the tensile strength of the elastic base layer may be 5000 to 8000 kPa, 6000 to 7000 kPa or 6500 to 6800 kPa, but is not limited thereto.

When the elongation rate or the tensile strength of the elastic base layer is within the above range, shape deformation of the elastic layer may be prevented during a manufacturing process including an adhesive layer lamination or a punching process. Specifically, when the elastic layer of silicone foam or urethane foam is laminated with a base material using an adhesive, shape deformation occurs even with a small force, but in the case of an elastic base layer, shape deformation of the elastic layer does not occur even during lamination. don't

The heat resistance temperature of the elastic base layer may be -55 to 200 °C, -55 to 170 °C or -55 to 150 °C.

When the heat resistance temperature of the elastic substrate layer is within the above range, the performance of the adhesive tape can be maintained at both low and high temperatures, and when the adhesive tape is used as a jig cushion for a camera module, a heat curing process that must be maintained at a high temperature for a certain period of time The performance of the adhesive tape does not deteriorate even when it passes through

Base layer (4)

In the adhesive tape according to the embodiment, the base layer is a layer that maintains the shape of the adhesive tape, and the base layer is selected from the group consisting of polyolefin-based resin, polyester-based resin, polyvinyl chloride-based resin, and polyurethane-based resin. It may include one or more species that are.

Specifically, the base layer may include a polyester-based resin.

For example, the base layer may include polyethylene terephthalate (PET), and the base layer may be transparent PET or colored PET including white, but is not limited thereto.

The base layer may have a thickness of 10 to 250 μm. Specifically, the base layer may have a thickness of 20 to 200 μm, 30 to 150 μm, 50 to 130 μm, 60 to 100 μm, 70 to 80 μm, or 75 to 125 μm, but is not limited thereto.

The tensile strength of the base layer in the MD direction may be 15 to 25 kg/mm ² . Specifically, the tensile strength of the base layer in the MD direction may be 16 to 22 kg/mm ² , 17 to 20 kg/mm ² or 18 to 19 kg/mm ² .

Tensile strength in the TD direction of the base layer may be 15 to 25 kg/mm ² . Specifically, the tensile strength of the base layer in the TD direction may be 16 to 23 kg/mm ² , 17 to 22 kg/mm ² or 19 to 21 kg/mm ² .

The MD direction breaking elongation of the base layer may be 180 to 300%. Specifically, the MD direction breaking elongation of the base layer may be 190 to 270%, 200 to 250%, 210 to 230%.

The elongation at break in the TD direction of the base layer may be 100 to 200%. Specifically, the elongation at break in the TD direction of the base layer may be 110 to 170%, 120 to 150%, and 130 to 140%.

The MD direction F-5 value or the TD direction F-5 value of the base layer may be 5 to 15 kg/mm ² . Specifically, the MD direction F-5 value or the TD direction F-5 value of the base layer is 7 to 12 kg/mm ² , the value is 8 to 13 kg/mm ² , the value is 10 to 12 kg/mm ² or 11 to 11.5 kg/mm ² .

MD direction thermal shrinkage of the base layer may be 0.1 to 3%. Specifically, the MD direction thermal shrinkage of the base layer may be 0.3 to 2%, 0.5 to 5%, 0.7 to 1.3%, or 0.9 to 1.1%.

A thermal contraction rate of the base layer in the TD direction may be 0.1 to 3%. Specifically, the TD direction heat shrinkage of the base layer may be 0.1 to 1%, 0.1 to 0.5%, or 0.1 to 0.3%.

The static friction coefficient of the base layer may be 0.1 to 1.0 μS. Specifically, the static friction coefficient of the base layer may be 0.2 to 0.7 μS, 0.2 to 0.5 μS, 0.3 to 0.5 μS, or 0.3 to 0.4 μS.

The kinetic friction coefficient of the base layer may be 0.1 to 0.8 μK. Specifically, the coefficient of kinetic friction of the base layer may be 0.2 to 0.7 μK, 0.2 to 0.5 μK, 0.3 to 0.5 μK, or 0.3 to 0.4 μK.

Haze of the base layer may be 0.5 to 5.0%. Specifically, the haze of the base layer may be 0.7 to 4.5%, 0.8 to 4.0%, 0.9 to 3.0%, 1.0 to 2.0%, or 1.3 to 1.8%.

Wet tension of the substrate layer may be 10 to 50 dyne/cm. Specifically, the wetting tension of the substrate layer may be 20 to 50 dyne/cm, 25 to 45 dyne/cm, 30 to 45 dyne/cm, or 35 to 40 dyne/cm.

Adhesive layer (1,5)

In the adhesive tape according to the embodiment, the adhesive layer is a layer that adheres the separated layers to each other, and includes a first adhesive layer 5 and a second adhesive layer 1.

The first adhesive layer and the second adhesive layer may be an ester-based adhesive, a urethane-based adhesive, or an acrylic adhesive.

The first adhesive layer is a strong adhesive layer that can be attached to the release layer, and is an adhesive or tape having a 180° peel strength of 1000 to 2000 gf/25mm.

Specifically, the 180° peel strength of the first adhesive layer may be 1200 to 1800 gf/25mm or 1400 to 1600 gf/25mm.

The 180 ° peel strength is a value measured according to ISO 29862:2007 using a Universal Tensile Test Machine.

The first adhesive layer may be at least one selected from acrylic adhesives and PET-based acrylic adhesive tapes, and is preferably an inorganic acrylic tape.

The thickness of the first adhesive layer may be 0.01 to 0.3 mm, 0.03 to 0.2 mm, or 0.05 to 0.1 mm.

The second adhesive layer is an adhesive layer that can be attached to a component assembly jig in a jig cushion for a camera module, and is a residue-free adhesive or residue-free tape designed so that no residual layer is left when attaching or detaching, and has a 180° peel strength of 300 to 800 gf /25mm.

Specifically, the 180° peel strength of the second adhesive layer may be 400 to 700 gf/25mm or 500 to 600 gf/25mm.

The second adhesive layer may be at least one selected from acrylic adhesives and PET-based acrylic adhesive tapes, and is preferably an inorganic acrylic tape.

The second adhesive layer may have a thickness of 0.005 to 0.03 mm, 0.01 to 0.02 mm, 0.012 to 0.017 mm, or 0.014 to 0.016 mm.

The adhesive tape according to the embodiment may have a difference in adhesive strength (AS) of 500 to 1000 gf/25 mm according to the following <Equation 1>.

<Equation 1>

AS1 is the 180° peel strength of the first adhesive layer, and AS2 is the 180° peel strength of the second adhesive layer.

The adhesive tape according to the embodiment may further include a third adhesive layer for adhering the elastic layer and the base layer.

The third adhesive layer may be at least one selected from acrylic adhesives and PET-based acrylic adhesive tapes, and is preferably an inorganic acrylic tape.

release layer (6)

In the adhesive tape according to the embodiment, the release layer is a layer that is removed when the adhesive tape is used, and a film liner such as a PE liner, a PP liner, or a PET liner may be used. In the present invention, a PET liner coated on both sides with silicone is used. used, but is not limited thereto.

The release layer may have a thickness of 25 to 100 μm. Specifically, the release layer may have a thickness of 25 to 100 μm, 30 to 90 μm, or 50 to 80 μm, but is not limited thereto.

In the laminated structure, another layer may be interposed between each layer.

For example, a primer layer may be interposed between the second adhesive layer and the elastic layer.

Physical properties of the adhesive tape (10)

Thermal conductivity of the adhesive tape may be 0.05 to 0.15 W/(m·K).

Specifically, the thermal conductivity of the adhesive tape may be 0.05 W/(m K) or more, 0.06 W/(m K) or more, or 0.07 W/(m K) or more, and 0.15 W/(m K) or more. ) or less, 0.13 W/(m·K) or less, or 0.11 W/(m·K) or less.

For example, the thermal conductivity of the adhesive tape may be 0.06 to 0.13 W/(m·K) or 0.07 to 0.11 W/(m·K).

When the thermal conductivity of the adhesive tape satisfies the aforementioned range, heat loss is reduced in the thermal curing process, thereby increasing process efficiency.

The heat resistance temperature of the adhesive tape may be -55 to 200 °C or -55 to 170 °C.

Specifically, the heat resistance temperature of the adhesive tape may be -55 ℃ or more, -50 ℃ or more, -40 ℃ or more, -30 ℃ or more, -20 ℃ or more, or -10 ℃ or more, 200 ℃ or less, 170 ℃ or less , or 150 ° C or less.

When the heat resistance temperature of the adhesive tape satisfies the above-mentioned range, the performance of the adhesive tape can be maintained even at low and high temperatures, and the performance of the adhesive tape is not deteriorated in the thermal curing process in which a certain time must be maintained at a high temperature in the camera assembly process. does not occur

The compression set of the adhesive tape measured by ASTM D1056 at 100 ° C is less than 10%.

Specifically, the elastic layer may have a permanent set of 8% or less, 5% or less, 5% or less, 4% or less, 3% or less, 2% or less, 1.5% or less, 1.1% or less, or 1% or less.

When the permanent set of the elastic layer falls within the above-mentioned range, it means that the physical stability of the elastic layer is secured, and when the permanent set is small, there is an effect of reducing the deviation of the position inside the camera module.

Jig cushion for camera module

A jig cushion for a camera module according to an embodiment includes an adhesive tape.

The jig cushion for the camera module includes a first adhesive layer; A substrate layer containing PET; An elastic layer containing silicone foam; and a second adhesive layer, wherein the elastic layer has a density of 100 to 1000 kg/m ³ .

Descriptions of the adhesive tape, the first adhesive layer, the substrate layer, the elastic layer, and the second adhesive layer are the same as described above.

Method for manufacturing adhesive tape

The method for manufacturing the adhesive tape of the present invention is not particularly limited as long as a laminate obtained by laminating each layer having a predetermined composition can be obtained, but the following method is exemplified.

The manufacturing method of the adhesive tape of the present invention includes the steps of preparing a substrate layer containing PET; and laminating an elastic layer by applying a composition for forming a silicone foam to one surface of the base layer.

A composition for forming a silicone foam (silicone foam production resin) is applied to one side of a substrate layer including PET and foamed to form a silicone foam on the substrate layer, whereby the elastic layer and the substrate layer are directly attached.

A separate layer is not interposed between the elastic layer and the base layer, and the elastic layer is directly attached to one surface of the base layer.

The application may be performed by solution casting or melt casting.

The thickness of the silicone foam of the elastic layer may be formed to be 0.5 mm or more.

The elastic layer may be disposed on one surface of the base layer, and the primer layer may be disposed on the other surface of the base layer.

In addition, a second adhesive layer may be further formed on the primer layer. At this time, by forming the primer layer, it is possible to improve the adhesive force between the elastic layer and the second adhesive layer.

Alternatively, an elastic layer may be formed on one surface of the base layer, and a second adhesive layer may be formed on the elastic layer. At this time, a separate layer may not be interposed on the elastic layer and the second adhesive layer, but is not limited thereto.

The second adhesive layer may be formed by applying an acrylic-based adhesive that does not leave residue on the other surface of the elastic layer that is not attached to the base layer or by attaching an inorganic acrylic-based adhesive that does not leave residue.

The first adhesive layer may be formed by applying an acrylic adhesive to the other surface of the base layer that is not attached to the elastic layer, or by attaching an inorganic acrylic tape.

A release layer may be attached to the other surface of the first adhesive layer that is not adhered to the substrate layer.

The manufactured adhesive tape is wound in the form of a roll, and can be used by unwinding it again when in use.

As shown in FIG. 2, when the adhesive tape is wound in a roll form, the release layer 6 and the second adhesive layer 1 are rolled together.

At this time, by using a residue-free adhesive as the second adhesive layer, it is possible to obtain the effect of smoothly winding and unrolling the roll.

Manufacturing method of jig cushion for camera module

The method for manufacturing a jig cushion for a camera module of the present invention is not limited, but, for example, the following method is suggested.

Remove the release layer of the adhesive tape and proceed to the punching step.

In the punching step, the second adhesive layer and the release layer are unwound again, the first adhesive layer and the attached release layer are removed, and the accommodating area into which the lens is inserted is pierced with a pressing blade to form an accommodating space.

In the present invention, since the adhesive layer is excluded between the elastic layer and the substrate layer, the punching process is performed more smoothly and foreign substances are hardly generated by less interference by the adhesive layer when the pressing blade penetrates. .

The shape of the jig cushion for the camera module may be manufactured, for example, by punching out a foam pad in the form of a square with rounded corners having a width of 0.3 to 3.0 cm, and punching out a circular shape with a diameter of 0.2 to 2.5 cm inside. The shape and dimensions may vary according to the outer shape of the module.

Thereafter, the jig cushions for the unit camera module perforated to correspond to the appearance of the camera module are separated to obtain a plurality of jig cushions for the camera module, and the first adhesive layer or the second adhesive layer, or the first adhesive A jig cushion for a camera module is manufactured by attaching release paper to one surface of each of the layer and the second adhesive layer.

A jig cushion for a camera module according to an embodiment includes a first adhesive layer; A substrate layer containing PET; An elastic layer containing silicone foam; and a second adhesive layer, and the elastic layer has a density of 100 to 1000 kg/m ³ .

Descriptions of the first adhesive layer, base layer, elastic layer, and second adhesive layer are as described above.

In the jig cushion for the camera module, the height of the jig cushion for the camera module may be 5% to 15% higher than the height of the portion to which the camera module is attached.

Hereinafter, the present invention will be described in more detail through preferred embodiments and experimental examples of the present invention. The following examples are intended to make the disclosure of the present invention complete and at the same time facilitate the practice of the invention to those skilled in the art, and the present invention is not limited to the following examples, but the appended claims Various types of embodiments may be implemented within the scope.

[Example]

<Example 1>

Example 1 casts a foamed resin of silicone foam (FUTUREWAY, SRL-1150F) on one side of a heat-resistant PET resin film (SKC, trade name: SG31) and then foams it to form a silicone foam, which is an elastic layer with a thickness of 2 mm, on the PET resin film. It was prepared to be directly attached on (base layer) (elastic base layer AP).

A first adhesive layer (inorganic acrylic tape, FNT Korea, trade name: FG-2587AD) having a thickness of 0.05 mm to 0.1 mm is attached on the other side of the PET base layer, and on one side of the elastic layer, the thickness is A second adhesive layer (inorganic acrylic tape, FNT Korea, product name: FG-9011AD) is attached to a thickness of 0.015 mm, and a release layer (silicone double-sided coating) is applied on the lower surface of the first adhesive layer and the upper surface of the second adhesive layer treated PET film) was attached to prepare an adhesive tape.

<Examples 2 to 5>

Example 2 was prepared in the same manner as Example 1, except that foamed resin of silicone foam (FUTUREWAY, SRL-1150S) was used (elastic substrate layer BP).

Example 3 was prepared in the same manner as Example 1, except that foamed resin of silicone foam (FUTUREWAY, SRL-1150F) was used (elastic base layer AP) and the thickness of the elastic layer was 4 mm.

In Example 4, after attaching the elastic layer A (silicone foam; FUTUREWAY, SRL-1150F) and the PET base layer with an acrylic inorganic material tape (third adhesive layer), the first adhesive layer, the first adhesive layer, An adhesive tape was prepared by stacking two adhesive layers and a release layer.

Example 5 was prepared in the same manner as Example 4, except that elastic layer B (silicone foam; FUTUREWAY, SRL-1150S) was used.

<Comparative Examples 1 to 3>

Comparative Example 1 was prepared in the same manner as Example 1, except that the foaming resin of the elastic layer C (silicone foam; FUTUREWAY, CM-90) was used.

Comparative Example 2 is a urethane foam; Rogers, Poron 4701-50 was laminated in 0.7 mm, three layers, and each layer was combined with the adhesive layer A to prepare an elastic layer D. Since the adhesive tape of Comparative Example 4 does not include a PET base layer due to the characteristics of wet urethane foam, the second adhesive layer is the same as in Example 1, except that the first adhesive layer is directly attached to one side of the elastic layer D, An adhesive tape was prepared by stacking an elastic layer, a first adhesive layer, and a release layer.

In addition, elastic layer C (silicone foam; FUTUREWAY Co., CM-90) was used, and a 1.6 mm elastic layer was separately processed and two processed elastic layers were combined with an adhesive layer A to produce a 3.5 mm elastic layer C. Except for one, it was prepared in the same manner as in Example 4.

[Evaluation example]

Evaluation Example 1: Density

Density was measured according to ASTM D1056-14 with an Electrical Balance, Vernier Caliper and Height Gauge.

Evaluation Example 2: average pore diameter, independent pore volume

The average pore diameter of Examples and Comparative Examples was cut into 15 mm * 15 mm horizontally, vertically, and 2 mm thick to prepare each specimen and measured with a multi-functional biological microscope.

The volume of the independent pore was prepared by cutting the Examples and Comparative Examples into 50 mm * 50 mm horizontally and vertically and 2 mm thick to prepare each specimen, place the specimen 50 mm below the surface of the water bath in a distilled water bath at room temperature, and After impregnating for 180 ± 10 seconds under reduced pressure to 17 kPa, it is impregnated for 180 ± 10 seconds at atmospheric pressure. The specimen was taken out, the moisture on the surface was wiped, and the weight was measured using an electronic balance, and the independent pore volume was measured by substituting it into Equation 2 below.

=

<Equation 2> Independent pore volume (%) =

=

V1: volume of open cells of the specimen

V0: volume of specimen

m1: Weight of specimen after impregnation

m0: initial weight of the specimen

ρ: Density of water (1g/cm3)

A: Area of the specimen

T: thickness of the specimen

Evaluation Example 3: CFD

Compression Force Deflection (CFD) was measured under a 25% deflection condition according to ASTM D1056.

Evaluation Example 4: Tensile strength, elongation, F-5 value

Tensile strength, elongation, elongation at break and F-5 value were measured according to ASTM D412-16 or ASTM D-882 with a Universal Tensile Test Machine (UTM).

Evaluation Example 5: Hardness

Hardness was measured according to ASTM D2240.

Evaluation Example 6: Thermal Shrinkage Rate

Thermal shrinkage was measured according to ASTM D-2305 at 150° C., 30 minutes.

Evaluation Example 7: Friction Coefficient

The coefficient of friction was measured according to ASTM D-1894.

Evaluation Example 8: Haze

Haze was measured according to ASTM D-1003.

Evaluation Example 9: Wet Tension

Wet tension was measured according to ASTM D-2578.

Evaluation Example 10: Water absorption rate

Water absorption was measured according to ASTM D1056-14 using an electronic balance and a vacuum dryer.

<Evaluation method of foreign matter occurrence>

Observe the silicone foam carrier manufactured with the silicone adhesive tape under a microscope and score O if there are no or less than 3 foreign materials, △ if 5 or less foreign materials are observed, and X if 10 or more foreign materials are observed was evaluated.

<Durability evaluation method>

After thousands of continuous die-cut operations are performed with a punching machine, durability is evaluated according to the amount of dust observed around the mold. Upon visual observation, if a large amount of dust is generated and work is resumed after separate dust removal, it is evaluated as X, if a small amount of dust is generated and work can be resumed without separate dust removal, △, and if little dust is generated, it is rated as O do.

<Workability evaluation method>

If significant mold wear is observed visually after punching on silicon adhesive tape, or if mold damage occurs, workability is rated as X. When mold wear is observed visually after punching on adhesive tape, it is rated △ When no change was observed with the naked eye, workability was evaluated as O.

elastic layer elastic layer A elastic layer B elastic layer C elastic layer D Density (kg/m ³ ) 450 400 to 500 1300 480 CFD (kPa) 120 to 180 110 to 240 1250 221 Tensile Strength (kPa) over 400 over 500 3000 1106 or higher Elongation (%) over 60 over 70 100 over 90 Average pore diameter (mm) 0.1328 0.1333 0.0521 0.3342 Independent pore volume (%) 99.20±0.05 99.20±0.09 99.50±0.05 55.21±0.08

Table 1 shows the physical properties of the elastic layer used in Examples or Comparative Examples of the present invention.

The elastic layers A and B are silicone foam elastic layers, and have a density in the range of 400 to 500 kg/m ³ , and are soft silicone foam elastic layers. Density may vary depending on the manufacturing thickness of the silicone foam. In the case of elastic layer B, if the thickness is 3 mm or less, the density is 500 kg/m ³ and the thickness is 5 mm If less, the density is 400 kg/m ³ .

The elastic layer C is a silicone foam elastic layer, density (1300 kg / m ³ ) and a silicone foam elastic layer having high hardness (52±5 Shore A).

The elastic layer D is a urethane foam elastic layer, and is a wet urethane foam having a density of 400 to 500 kg/m ³ .

The elastic layers A and B have lower tensile strength and elongation than those of the elastic layers C or D, and are thus more likely to change shape or break when stretched in the longitudinal direction.

Table 1 and FIG. 3 show the closed pore volume. The elastic layers A and B have remarkably low water absorption rates compared to elastic layer D having similar densities, and the average independent pore volume based on the total pore volume is 99.20%, indicating that most of the pores are independent pores.

It has low thermal conductivity and low permanent set compared to elastic layers C and D, so it has excellent thermal stability even when used as a jig cushion for camera module assembly involving high-temperature manufacturing processes.

In particular, since the elastic layers A and B have a heat resistance temperature of 200 ℃ due to the characteristics of the silicone material, the shape does not change even in the high-temperature curing process of 100 ~ 150 ℃ to shorten the time required for curing in the curing process during camera module assembly. However, it can provide sufficient buffering performance.

The average pore diameter in Table 1 is the average value of the measured pore diameters, and FIGS. 4 and 5 show the results of measuring the pore diameters. In addition, it can be seen that the elastic layers A and B have an average pore diameter of about 0.133, and pores having a pore size between 0.1 and 0.2 mm are distributed the most.

Average thickness (μm) 75 125 Tensile strength (kg/mm ² ) MD 19 18 TD 21 19 Elongation at break (%) MD 210 230 TD 140 130 F-5 value (kg/mm ² ) MD 11.5 11.5 TD 11 11.5 Thermal Shrinkage (%) MD 1.0 1.0 TD 0.2 0.2 friction coefficient μS 0.35 0.35 μK 0.30 0.30 haze % 1.3 1.8 wetting tension dyne/cm 38 38

Table 2 shows the physical properties of the substrate layer (PET film) used in Examples or Comparative Examples of the present invention.

division Thickness of the total elastic layer Thickness of single elastic layer foreign body durability Workability Water absorption rate (%) Example 1 2mm 2mm O O O less than 5% Example 2 2mm 2mm O O O less than 5% Example 3 4 mm 4mm O O O less than 5% Example 4 2mm 2mm △ △ △ less than 5% Example 5 2mm 2mm △ △ △ less than 5% Comparative Example 1 2mm 2mm O △ X less than 5% Comparative Example 2 2mm 0.7 mm X X X 259% Comparative Example 3 3.5 mm 1.6mm △ △ X less than 5%

Table 3 shows the physical properties of the adhesive tapes of Examples or Comparative Examples of the present invention.

In Comparative Examples 2 and 3, the desired thickness of the adhesive tape was implemented using multi-layer elastic layers, and it can be seen that workability and durability also decreased as the number of adhesive layers increased.

As a result of evaluation of occurrence of foreign matter, in the case of the adhesive tapes according to Examples 1 to 3, no foreign matter was observed, but in the case of Examples 4 and 5 and Comparative Example 3, almost no foreign matter generated in the silicone foam itself was observed, but in the adhesive layer Foreign matter occurred in some cases. In the case of Comparative Example 3, a product in which a layering phenomenon occurred due to a multilayer structure was found. In addition, in the case of Comparative Example 2, dust and foreign matter were generated in the urethane foam itself, and a layering phenomenon occurred due to the residual phenomenon and porous material characteristics.

In the case of Examples 4 and 5, durability and workability were improved compared to conventional Comparative Examples 1 to 3, and durability and workability were excellent when manufacturing a jig cushion for a camera module with the adhesive tape of Examples 1 to 3. In Comparative Examples 2 and 3, due to the structure in which the adhesive layer was interposed between the elastic layers, layering and product deformation were observed, and in Comparative Examples 1 and 3, the replacement cycle of the punching blade due to the hardness of the elastic layer. was short

Regarding the water absorption rate, in the case of the adhesive tapes of Examples 1 to 5, the water absorption rate was less than 5% due to the large number of independent pores, but in the case of Comparative Example 2, the water absorption rate was 259%. may occur.

1: second adhesive layer
2: elastic base layer
3: elastic layer
4: base layer
5: first adhesive layer
6: release layer
10: adhesive tape

Claims (10)

A substrate layer containing PET; and
Including; elastic layer containing silicone foam;
The adhesive tape having a density of 100 to 1000 kg/m ³ of the elastic layer.
According to claim 1,
The elastic layer is disposed on one surface of the base layer,
a first adhesive layer disposed on the other surface of the substrate layer; and
The adhesive tape further comprising a second adhesive layer disposed on one side of the elastic layer on which the base layer is not disposed.
According to claim 1,
A separate layer is not interposed between the base layer and the elastic layer,
An adhesive tape comprising an elastic base layer to which the elastic layer is directly attached on one surface of the base layer.
According to claim 1,
The adhesive tape having a density of 300 to 800 kg/m ³ of the elastic layer.
According to claim 1,
An average diameter of the pores of the elastic layer is 0.01 to 0.6 mm, the adhesive tape.
According to claim 1,
The adhesive tape having a Compression Force Deflection (CFD) of 100 to 1000 kPa when 25% of the total volume of the elastic layer is compressed.
According to claim 1,
The elastic layer is composed of a single layer, and the thickness of the elastic layer is 0.5 to 5.0 mm, the adhesive tape.
According to claim 1,
The elastic layer includes closed pores,
The independent pore volume of the elastic layer is 75 to 100% by volume of the total pore volume, the adhesive tape.
According to claim 2,
The 180 ° peel strength of the first adhesive layer is 1000 to 2000 gf / 25mm,
The 180 ° peel strength of the second adhesive layer is 300 to 800 gf / 25 mm, the adhesive tape.
a first adhesive layer;
A substrate layer containing PET;
An elastic layer containing silicone foam; and
A second adhesive layer; including,
The elastic layer has a density of 100 to 1000 kg/m ³ , a jig cushion for a camera module.

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