Sealing sheet and method for manufacturing electronic component device
阅读说明:本技术 密封用片和电子元件装置的制造方法 (Sealing sheet and method for manufacturing electronic component device ) 是由 大原康路 土生刚志 清水祐作 饭野智绘 于 2019-06-24 设计创作,主要内容包括:一种密封用片,被用于形成密封层,所述密封层将被安装于基板的厚度方向的一个面的电子元件密封。所述密封用片的90℃的粘度为5kPa以上。由密封试验测定的最大长度L为150μm以下。(A sealing sheet is used for forming a sealing layer for sealing an electronic element mounted on one surface in a thickness direction of a substrate. The sealing sheet has a viscosity of 5kPa or higher at 90 ℃. The maximum length L measured by the sealing test is 150 μm or less.)
1. A sealing sheet for forming a sealing layer for sealing an electronic element mounted on one surface in a thickness direction of a substrate,
the sealing sheet has a viscosity of 5kPa or higher at 90 ℃,
the maximum length L of the sealing sheet measured by the sealing test described below is 150 μm or less,
sealing test:
a test element is arranged on one surface of a test substrate made of glass in the thickness direction, the test element is a rectangle having a length of 10mm and a thickness of 400 [ mu ] m in a first direction orthogonal to the thickness direction and in a second direction orthogonal to the thickness direction and the first direction,
the test element was closely attached to the rectangular sealing sheet having a length of 20 μm and a thickness of 260 μm in the first direction and the second direction so as to overlap the test element in the thickness direction at 25 ℃ and 1330Pa by pressing the test element at 2MPa for 60 seconds,
thereafter, the sealing sheet was heated at 150 ℃ for 1 hour to form the sealing layer,
a test gap is formed by dividing at least 1 end surface in at least either one of the first direction and the second direction of the test element, one surface in the thickness direction of the test substrate, and the other surface in the thickness direction of the seal layer facing the end surface and the one surface in the thickness direction, and the maximum length L in the one direction of the test gap is measured.
2. The sealing sheet according to claim 1, wherein the viscosity at 90 ℃ is 200kPa or less.
3. The sealing sheet according to claim 1, wherein the linear expansion coefficient of the sealing layer is 20ppm or less.
4. The sealing sheet according to claim 1, wherein the inorganic filler is contained in an amount of 80% by mass or more.
5. The sealing sheet according to claim 1, wherein at least one 2-functional epoxy resin selected from the group consisting of bisphenol A epoxy resins and bisphenol F epoxy resins is contained in an amount of 2% by mass or more.
6. A method for manufacturing an electronic component device, comprising: and a step of pressing the sealing sheet according to claim 1 against the electronic component and heating the same to form the sealing layer for sealing the electronic component.
Technical Field
The present invention relates to a sealing sheet and a method for manufacturing an electronic component device, and more particularly, to a sealing sheet and a method for manufacturing an electronic component device using the sealing sheet.
Background
Conventionally, it has been known that an electronic component device is manufactured by forming a sealing layer for embedding and sealing an electronic component by pressure-bonding a sealing sheet to a substrate and the electronic component mounted thereon (see, for example, japanese patent application laid-open No. 2016-089091).
Disclosure of Invention
However, the electronic component mounted on the substrate protrudes upward, and the peripheral side surface of the electronic component is orthogonal to the surface of the substrate on which the electronic component is mounted.
Therefore, when the electronic component is embedded in the sealing sheet, the gap between the peripheral side surface of the electronic component and the surface of the substrate around the electronic component cannot be completely sealed by the sealing sheet, and the sealing sheet floats, so that a large gap defined by the peripheral side surface of the electronic component, the surface of the substrate, and the back surface of the floating sealing sheet is easily generated. Therefore, there is a problem that the reliability of the electronic component device having a large void is lowered.
On the other hand, although the sealing sheet softens when sealing the electronic component, if the sealing sheet is softened further, the voids can be made smaller, but if the sealing sheet flows excessively, the material of the sealing sheet is exposed to the outside of the substrate, and the periphery thereof is contaminated.
The invention provides a sealing sheet and a method for manufacturing an electronic element device, wherein the sealing sheet can reliably seal an electronic element while inhibiting the exposure of the sealing sheet to the outside, thereby manufacturing the electronic element device with excellent reliability.
The present invention (1) includes a sealing sheet for forming a sealing layer for sealing an electronic component mounted on one surface in a thickness direction of a substrate, the sealing sheet having a viscosity of 5kPa or more at 90 ℃, and the sealing sheet having a maximum length L of 150 μm or less as measured by a sealing test described below.
< sealing test >
A test element having a rectangular shape with a thickness of 400 μm and a length of 10mm in a first direction orthogonal to the thickness direction and in a second direction orthogonal to the thickness direction and the first direction is arranged on one surface in the thickness direction of a test substrate made of glass, the test element is closely attached to the rectangular sealing sheet with a length of 20 μm and a thickness of 260 μm in the first direction and the second direction by pressing the rectangular sealing sheet with 2MPa for 60 seconds so as to overlap the test element in the thickness direction at 25 ℃ and 1330Pa, and then the sealing layer is formed by heating the sealing sheet at 150 ℃ for 1 hour. A test gap is formed by dividing at least 1 end surface in at least either one of the first direction and the second direction of the test element, one surface in the thickness direction of the test substrate, and the other surface in the thickness direction of the seal layer facing the end surface and the one surface in the thickness direction, and the maximum length L in the one direction of the test gap is measured.
Since the sealing sheet has a viscosity of 5kPa or more at 90 ℃, when the sealing sheet is heated to seal an electronic component, the sealing sheet softens and suppresses excessive flow, and the electronic component can be embedded reliably while suppressing exposure of the material of the sealing sheet. Therefore, the sealing sheet has excellent sealing properties against electronic components, and can suppress contamination to the surroundings.
On the other hand, the sealing sheet has a maximum length L as measured in a sealing test as short as 150 μm or less, and therefore can follow a fine uneven structure without voids, and is excellent in water resistance and weather resistance, and therefore, an electronic component device having excellent reliability can be manufactured.
Therefore, according to the sealing sheet, the electronic element can be reliably sealed while exposure of the material of the sealing sheet is suppressed, and an electronic element device having excellent reliability can be manufactured.
The invention (2) comprises the sealing sheet according to (1), wherein the viscosity at 90 ℃ is 200kPa or less.
The invention (3) is a sealing sheet according to the item (1) or (2), wherein the sealing layer has a linear expansion coefficient of 20ppm or less.
The invention (4) comprises the sealing sheet according to any one of (1) to (3), which contains 80% by mass or more of an inorganic filler.
The invention (5) comprises the sealing sheet according to any one of (1) to (4), which contains 2% by mass or more of at least one 2-functional epoxy resin selected from the group consisting of bisphenol A-type epoxy resins and bisphenol F-type epoxy resins.
The present invention (6) includes a method for manufacturing an electronic component device, including: a step of pressing the sealing sheet according to any one of (1) to (5) against the electronic component and heating the same to form the sealing layer for sealing the electronic component.
In the method for manufacturing an electronic component device, the viscosity of the sealing sheet at 90 ℃ is 5kPa or more, and therefore, when the sealing sheet is heated to seal the electronic component, the sealing sheet is softened and at the same time excessive flow is suppressed, and the electronic component can be reliably embedded while exposure of the material of the sealing sheet is suppressed. Therefore, the sealing sheet has excellent sealing properties against electronic components, and can suppress contamination to the surroundings.
On the other hand, the maximum length L of the sealing sheet measured in the sealing test is as short as 150 μm or less, and therefore, the sealing sheet can follow a fine uneven structure without voids, and is excellent in water resistance and weather resistance, and thus, an electronic component device excellent in reliability can be manufactured.
Therefore, according to the method for manufacturing an electronic component device, the electronic component can be reliably sealed while suppressing exposure of the material of the sealing sheet, and an electronic component device having excellent reliability can be manufactured.
According to the sealing sheet and the method for manufacturing an electronic component device of the present invention, the electronic component can be reliably sealed while exposure of the material of the sealing sheet is suppressed, and an electronic component device with excellent reliability can be manufactured.
Drawings
Fig. 1A to 1C are process diagrams for manufacturing an electronic component device using an electronic component sealing sheet as one embodiment of the sealing sheet of the present invention, fig. 1A shows a process for preparing the electronic component sealing sheet and an electronic component mounting substrate, fig. 1B shows a pressing process for closely bonding the electronic component sealing sheet and the electronic component, and fig. 1C shows a heating process for heating the electronic component sealing sheet.
Fig. 2A and 2B are views for explaining a process of preparing an electronic component sealing sheet and an electronic component mounting substrate in a sealing test, in which fig. 2A shows a plan view and fig. 2B shows a cross-sectional view.
Fig. 3A and 3B are views for explaining a press test process in the seal test, following fig. 2A and 2B, and fig. 3A shows a plan view and fig. 3B shows a cross-sectional view.
Fig. 4A and 4B are views for explaining a heating test process in the sealing test, which are shown after fig. 3A and 3B, and fig. 4A shows a plan view and fig. 4B shows a cross-sectional view.
Fig. 5 is a plan view showing a modification of the heat test step shown in fig. 4A.
Detailed Description
An electronic component sealing sheet as one embodiment of the sealing sheet of the present invention will be described with reference to fig. 1A to 4B.
In fig. 3A and 4A, although the
As shown in fig. 1A to 1C, the electronic
The electronic
As shown in fig. 1A, the electronic
The
When the electronic
The material of the electronic
The sealing composition contains, for example, a thermosetting component.
The thermosetting component is a component that is temporarily softened by heating at the time of sealing the
The thermosetting component is B-stage, not C-stage (i.e., in a state before complete curing) in the electronic
The thermosetting component contains, for example, a main agent, a curing agent, and a curing accelerator.
Examples of the main agent include epoxy resins, phenol resins, melamine resins, vinyl ester resins, cyanoester resins, maleimide resins, and silicone resins. The main agent is preferably an epoxy resin from the viewpoint of heat resistance and the like. When the main agent is an epoxy resin, the thermosetting component constitutes an epoxy thermosetting component together with a curing agent (epoxy curing agent) and a curing accelerator (epoxy curing accelerator) which will be described later.
Examples of the epoxy resin include: 2-functional epoxy resins such as bisphenol a type epoxy resin, bisphenol F type epoxy resin, modified bisphenol a type epoxy resin, modified bisphenol F type epoxy resin, biphenyl type epoxy resin, and the like; for example, a multifunctional epoxy resin having 3 or more functions such as a phenol novolac type epoxy resin, a cresol novolac type epoxy resin, a trishydroxyphenylmethane type epoxy resin, a tetrakis (hydroxyphenyl) ethane type epoxy resin, a dicyclopentadiene type epoxy resin, and the like. These epoxy resins may be used alone or in combination of 2 or more.
The 2-functional epoxy resin is preferably used alone, and bisphenol a type epoxy resin and bisphenol F type epoxy resin are more preferably used.
The epoxy equivalent of the epoxy resin is, for example, 10 g/eq.or more, preferably 100 g/eq.or more, and is, for example, 300 g/eq.or less, preferably 250 g/eq.or less.
The softening point of the main agent (preferably, epoxy resin) is, for example, 50 ℃ or higher, preferably 70 ℃ or higher, and is, for example, 110 ℃ or lower, preferably 90 ℃ or lower.
In the sealing composition, the proportion of the main agent (preferably, epoxy resin) is, for example, 1 mass% or more, preferably 2 mass% or more, and is, for example, 30 mass% or less, preferably 10 mass% or less. In the thermosetting component, the proportion of the main agent (preferably, epoxy resin) is, for example, 50 mass% or more, preferably 60 mass% or more, and is, for example, 90 mass% or less, preferably 10 mass% or less.
In the sealing composition, the proportion of the 2-functional epoxy resin (specifically, at least one 2-functional epoxy resin selected from the bisphenol a type epoxy resin and the bisphenol F type epoxy resin) is, for example, 1 mass% or more, preferably 2 mass% or more, more preferably 3 mass% or more, and, for example, 5 mass% or less. When the ratio of the 2-functional epoxy resin is not less than the lower limit, the fluidity of the sealing composition can be improved, and the
The curing agent is a component (preferably, an epoxy resin curing agent) for curing the main agent by heating. Examples of the curing agent include phenol resins such as phenol novolac resins.
The proportion of the curing agent is adjusted so that the total amount of hydroxyl groups in the phenolic resin is, for example, 0.7 equivalents or more, preferably 0.9 equivalents or more, and, for example, 1.5 equivalents or less, preferably 1.2 equivalents or less, relative to 1 equivalent of epoxy groups in the epoxy resin, when the main agent is an epoxy resin and the curing agent is a phenolic resin. Specifically, the blending amount of the curing agent is, for example, 30 parts by mass or more, preferably 50 parts by mass or more, and is, for example, 75 parts by mass or less, preferably 60 parts by mass or less, based on 100 parts by mass of the main agent.
The curing accelerator is a catalyst (heat curing catalyst) for accelerating the curing of the main component by heating (preferably, an epoxy resin curing accelerator), and examples thereof include organic phosphorus compounds, for example, imidazole compounds such as 2-phenyl-4, 5-dihydroxymethylimidazole (2 PHZ-PW). Preferably, an imidazole compound is used. The compounding amount of the curing accelerator is, for example, 0.05 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the base compound.
The sealing composition may further contain additives such as an inorganic filler, a thermoplastic component, a pigment, and a silane coupling agent in addition to the thermosetting component.
The inorganic filler is an inorganic particle that improves the strength of the sealing layer 5 (described later) and imparts excellent toughness to the
The shape of the inorganic filler is not particularly limited, and examples thereof include substantially spherical, substantially plate-shaped, substantially needle-shaped, and amorphous. Preferably, it is substantially spherical.
The average value (average particle diameter if the inorganic filler is substantially spherical) M of the maximum length of the inorganic filler is, for example, 50 μ M or less, preferably 20 μ M or less, more preferably 10 μ M or less, and is, for example, 0.1 μ M or more, preferably 0.5 μ M or more. The average particle diameter M is determined as a D50 value (cumulative 50% median diameter) based on a particle size distribution obtained by a particle size distribution measurement method in the laser light scattering method, for example.
In addition, the inorganic filler may include a first filler, and a second filler having an average value of maximum length M2 that is less than the average value of maximum length M1 of the first filler.
The average value (average particle diameter if substantially spherical) M1 of the maximum length of the first filler is, for example, 1 μ M or more, preferably 3 μ M or more, and is, for example, 50 μ M or less, preferably 30 μ M or less.
The average value (average particle diameter if substantially spherical) M2 of the maximum length of the second filler is, for example, less than 1 μ M, preferably 0.8 μ M or less, and is, for example, 0.01 μ M or more, preferably 0.1 μ M or more.
The ratio (M1/M2) of the average of the maximum lengths of the first filler to the average of the maximum lengths of the second filler is, for example, 2 or more, preferably 5 or more, and is, for example, 50 or less, preferably 20 or less.
The materials of the first filler and the second filler may be the same or different.
Further, as for the inorganic filler, the surface thereof may be partially or entirely surface-treated with a silane coupling agent or the like.
When the inorganic filler contains the first filler and the second filler, the proportion of the first filler in the sealing composition is, for example, 40 mass% or more, preferably more than 50 mass%, and, for example, 80 mass% or less, preferably 70 mass% or less. The blending proportion of the second filler is, for example, 40 parts by mass or more, preferably 50 parts by mass or more, and is, for example, 70 parts by mass or less, preferably 60 parts by mass or less, with respect to 100 parts by mass of the first filler.
The proportion of the inorganic filler in the sealing composition is, for example, 50 mass% or more, preferably 65 mass% or more, more preferably 80 mass% or more, and, for example, 95 mass% or less, preferably 90 mass% or less. When the content ratio of the inorganic filler is not less than the lower limit, the reliability of the obtained
The thermoplastic component is a component that improves the flexibility of the electronic
Examples of the thermoplastic resin include: natural rubber, butyl rubber, isoprene rubber, chloroprene rubber, an ethylene-vinyl acetate copolymer, an ethylene-acrylic acid ester copolymer, a polybutadiene resin, a polycarbonate resin, a thermoplastic polyimide resin, a polyamide resin (6-nylon, 6-nylon, etc.), a phenoxy resin, an acrylic resin, a saturated polyester resin (PET, etc.), a polyamideimide resin, a fluororesin, a styrene-isobutylene-styrene block copolymer, and the like. These thermoplastic resins may be used alone or in combination of 2 or more.
The thermoplastic resin is preferably an acrylic resin from the viewpoint of improving dispersibility with a main agent (preferably, an epoxy resin).
Examples of the acrylic resin include: a carboxyl group-containing (meth) acrylate copolymer (preferably a carboxyl group-containing acrylate copolymer) obtained by polymerizing monomer components including an alkyl (meth) acrylate having a linear or branched alkyl group and another monomer (copolymerizable monomer).
Examples of the alkyl group include alkyl groups having 1 to 6 carbon atoms such as a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, a tert-butyl group, an isobutyl group, a pentyl group, and a hexyl group.
Examples of the other monomer include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid.
The weight average molecular weight of the thermoplastic component is, for example, 10 ten thousand or more, preferably 30 ten thousand or more, and is, for example, 100 ten thousand or less, preferably 90 ten thousand or less. The weight average molecular weight is measured by Gel Permeation Chromatography (GPC) based on a standard polystyrene conversion value.
The proportion of the thermoplastic component (solid content proportion) is adjusted so as not to inhibit thermosetting of the sealing composition, and specifically, is, for example, 1 mass% or more, preferably 2 mass% or more, and is, for example, 10 mass% or less, preferably 5 mass% or less, relative to the sealing composition. The thermoplastic component may be prepared by diluting with a suitable solvent.
The ratio of the mass of the thermoplastic component to the mass of the inorganic filler (mass of the thermoplastic component/mass of the inorganic filler) is, for example, 0.175 or more, preferably 0.18 or more, and is, for example, 0.33 or less, preferably 0.30 or less, and more preferably 0.25 or less. If the ratio is not less than the lower limit, the viscosity of the electronic
Examples of the pigment include black pigments such as carbon black. The average particle diameter of the pigment is, for example, 0.001 μm or more, for example, 1 μm or less. The proportion of the pigment with respect to the sealing composition is, for example, 0.1% by mass or more, and is, for example, 2% by mass or less.
Examples of the silane coupling agent include silane coupling agents containing an epoxy group. Examples of the epoxy group-containing silane coupling agent include: 3-glycidoxypropyldialkyldialkoxysilanes such as 3-glycidoxypropylmethyldimethoxysilane and 3-glycidoxypropylmethyldiethoxysilane; for example, 3-glycidoxyalkyltrialkoxysilanes such as 3-glycidoxypropyltrimethoxysilane and 3-glycidoxypropyltriethoxysilane. Preferred examples are 3-glycidoxyalkyltrialkoxysilanes. The blending ratio of the silane coupling agent is, for example, 0.1 part by mass or more, preferably 1 part by mass or more, and is, for example, 10 parts by mass or less, preferably 5 parts by mass or less, with respect to 100 parts by mass of the inorganic filler.
The thickness of the electronic
The shape of the electronic
The electronic
On the other hand, the viscosity of the electronic
The temperature of 90 ℃ that determines the viscosity of the electronic
The method for measuring the viscosity of the electronic
The maximum length L of the
< sealing test >
In the sealing test, the following press test step (see fig. 2A to 3B) and heat test step (see fig. 4A and 4B) are performed in this order.
In the press test step, as shown in fig. 2A and 2B, first, 1
Next, after a rectangular
In the press test step, the sealing
The press test process is performed in a pressure reducing device (vacuum device) 60. The conditions of the pressure reducing device (vacuum device) 60 were 25 ℃ and 1330Pa as described above.
As shown in fig. 3A and 3B, in this press test step, a
Of these, the 4 first test voids 71 do not face the 4
In the heat test step, as shown in fig. 4A and 4B, first, the
Then, the sealing
The
Thus, the length (maximum length) from the
The second test voids 72 are formed in 4 corresponding to the 4 end faces 61. The 4 end faces 61 are: one
The maximum length in the first direction facing the one
The
Then, the maximum value among the widths L3 to L6 was taken as L. Specifically, when the width L3 and the width L4 are compared, and the width L3 is the same as or longer than the width L4, the width L3 is taken as the maximum length of the second trial gap, i.e., the width L. When the width L3 and the width L5 are compared and the width L3 is the same as or longer than the width L5, the width L3 is taken as the width L, which is the maximum length of the second test gap. Comparison of the width L3 and the width L6, the width L4 and the width L5, and the width L4 and the width L6 is performed in the same manner as described above, and details thereof are omitted.
If the maximum length (width) L of the
In producing the electronic
On the other hand, the electronic
In the electronic
(method of manufacturing electronic component device)
Next, a method for manufacturing the
The method comprises: a preparation step of preparing the electronic
(preparation Process)
As shown in fig. 1A, in the preparation step, the above-described electronic component sealing sheet 1 (preferably, B-stage electronic component sealing sheet 1) is prepared. In the preparation step, the
Two or more
One
The
The thickness of the
When the thicknesses of two or more
The maximum length of the
The
The
One
(sealing Process)
In the sealing step, as shown in fig. 1B and 1C, the
The conditions of the pressing step and the heating step may include the conditions (temperature, time, pressure, and the like) of the pressing test step and the heating test step in the sealing test described above. The pressing step and the heating step are explained below in this order.
(pressing step)
As shown by the arrows in fig. 1A and fig. 1B, in the pressing step, first, the electronic
Thereby, the electronic
Then, the
The
When the electronic
(heating step)
Thereafter, as shown in fig. 1C, the electronic
The
In this heating step, the
Specifically, the fluidity of the electronic
The
The material of the
The linear expansion coefficient α of the
Thereby, the
The maximum value of the separation distance L6 of the
Since the viscosity of the electronic
On the other hand, since the maximum length L measured in the sealing test is as short as 150 μm or less, the electronic
Therefore, according to the electronic
In the method of manufacturing the
On the other hand, in the electronic
Therefore, according to the method for manufacturing the
The method for manufacturing the
Modification example
In the following modifications, the same components and steps as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Each modification can exhibit the same operational advantages as the one embodiment, except for the special explanation. Further, one embodiment and its modified examples can be combined as appropriate.
In the above description, the pressing step is performed under vacuum (reduced pressure), but the pressing step is not limited thereto, and may be performed under atmospheric pressure, for example. The pressing process is preferably performed under vacuum. If the pressing step is performed under vacuum, the separation distance L6 of the
As shown by the broken line in fig. 1C, this method may include a step of dicing the
In the seal test, the
Further, as shown in fig. 5, the 4
In one embodiment, the electronic
In one embodiment, the pressing step and the heating step are performed sequentially, but may be performed simultaneously, for example.
The electronic
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