WO2012002174A1 - 無鉛半導体封入用ガラス - Google Patents
無鉛半導体封入用ガラス Download PDFInfo
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- WO2012002174A1 WO2012002174A1 PCT/JP2011/063917 JP2011063917W WO2012002174A1 WO 2012002174 A1 WO2012002174 A1 WO 2012002174A1 JP 2011063917 W JP2011063917 W JP 2011063917W WO 2012002174 A1 WO2012002174 A1 WO 2012002174A1
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- WO
- WIPO (PCT)
- Prior art keywords
- glass
- content
- lead
- semiconductor
- mass
- Prior art date
Links
- 239000011521 glass Substances 0.000 title claims abstract description 123
- 239000004065 semiconductor Substances 0.000 title claims abstract description 48
- 238000007789 sealing Methods 0.000 title abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 12
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 11
- 238000005538 encapsulation Methods 0.000 claims description 11
- 229910052708 sodium Inorganic materials 0.000 claims description 8
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 7
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 6
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- 150000001340 alkali metals Chemical group 0.000 claims description 3
- 238000007689 inspection Methods 0.000 abstract description 6
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Inorganic materials O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 abstract 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 abstract 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 abstract 1
- YEAUATLBSVJFOY-UHFFFAOYSA-N tetraantimony hexaoxide Chemical compound O1[Sb](O2)O[Sb]3O[Sb]1O[Sb]2O3 YEAUATLBSVJFOY-UHFFFAOYSA-N 0.000 abstract 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 20
- 230000000694 effects Effects 0.000 description 20
- 229910052751 metal Inorganic materials 0.000 description 18
- 239000002184 metal Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 16
- 239000002994 raw material Substances 0.000 description 14
- 239000011787 zinc oxide Substances 0.000 description 10
- 238000002844 melting Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 238000000465 moulding Methods 0.000 description 9
- 239000011734 sodium Substances 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 238000004031 devitrification Methods 0.000 description 5
- 230000001603 reducing effect Effects 0.000 description 5
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 4
- 238000005352 clarification Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000006060 molten glass Substances 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 240000001417 Vigna umbellata Species 0.000 description 2
- 235000011453 Vigna umbellata Nutrition 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000006025 fining agent Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 229910000416 bismuth oxide Inorganic materials 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 description 1
- 238000003280 down draw process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000007511 glassblowing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 210000003000 inclusion body Anatomy 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000005355 lead glass Substances 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/29—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the material, e.g. carbon
- H01L23/291—Oxides or nitrides or carbides, e.g. ceramics, glass
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/062—Glass compositions containing silica with less than 40% silica by weight
- C03C3/064—Glass compositions containing silica with less than 40% silica by weight containing boron
- C03C3/068—Glass compositions containing silica with less than 40% silica by weight containing boron containing rare earths
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/24—Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/56—Materials, e.g. epoxy or silicone resin
Definitions
- the present invention relates to glass for semiconductor encapsulation, and specifically to glass used for encapsulation of semiconductor elements such as thermistors, diodes, and LEDs.
- Such glass for encapsulating a semiconductor is called a bead after melting a glass raw material in a melting furnace and forming the molten glass into a tubular shape, cutting the obtained glass tube into a length of about 2 mm, washing it, and so on. A short glass tube is manufactured, and then the glass tube is chipped and cracked by inspection to be shipped. Further, glass may be exposed to an acidic plating solution or flux for the terminal treatment in assembling the diode.
- the glass for semiconductor encapsulation is (1) that it can be encapsulated at a low temperature so as not to deteriorate the semiconductor element, and (2) a metal that inputs and outputs signals not only to the semiconductor element but also to the semiconductor element in order to ensure highly reliable adhesion. It has a thermal expansion coefficient that matches the thermal expansion coefficient of the wire, (3) Adhesion between glass and metal wire is sufficiently high, (4) High volume resistance, (5) Chemical resistance is sufficiently strong Such characteristics are required.
- the sealing temperature and the sealing time are adjusted so that an oxide film with an appropriate thickness is formed, and specifically, the sealing temperature and the sealing time are adjusted so that the color tone of the oxide film becomes a red bean color.
- the color tone of the oxide film is black, the oxide film is peeled off from the metal wire, and sealing cannot be performed properly. Further, when the oxide film disappears and exhibits a metallic luster, the adhesion between the glass and the metal is lost, and the sealing cannot be performed properly.
- the glass for semiconductor devices having a low temperature encapsulating is usually the Sb 2 O 3 exert refining effect at low temperature containing about 0.8 wt%.
- Sb 2 O 3 is susceptible to a reducing action and has an action of providing oxygen to the glass, there is a possibility that Sb 2 O 3 itself is reduced to a metal to generate Sb metal fine particles inside the glass. is there. In this case, when the glass and the semiconductor element are in contact with each other, the reduced Sb metal fine particles may adversely affect the element characteristics of the semiconductor element. Further, when glass tends to be reduced, the diffusion rate of the oxide film of the metal wire may change, and the semiconductor element may not be stably encapsulated.
- the glass has been melted at a low temperature for a long time and an oxidizing agent such as nitrate has been added so that the glass does not tend to be reduced.
- an oxidizing agent such as nitrate has a large environmental load, and the Sb compound itself has a concern about the environmental load, so it is desired to reduce its content.
- glass tubes used for encapsulating semiconductor elements have been required to automate appearance inspection in order to increase production efficiency.
- the appearance inspection is automated using a CCD camera or the like, the appearance is observed from the side surface of the glass tube. Therefore, it is preferable that the glass tube is colored or emits fluorescence.
- a technical problem of the present invention is to create a lead-free glass for encapsulating lead-free semiconductors that is easy to automate the appearance inspection and is excellent in clarity and encapsulation of semiconductor elements.
- the present inventors limited the Sb 2 O 3 content to 0.1% by mass or less with a glass that basically does not contain PbO, and introduced CeO 2 to achieve the above technical problem. It was found that can be solved.
- Patent Document 2 although the use of CeO 2 as fining agents are described, which allows coexistence with Sb 2 O 3, also the use of CeO 2 instead of Sb 2 O 3 There is no explanation about the effect of.
- the glass for encapsulating lead-free semiconductors of the present invention has a viscosity temperature of 10 6 dPa ⁇ s or less, 670 ° C. or less, a CeO 2 content of 0.01 to 6 mass% as a glass composition, and Sb The content of 2 O 3 is 0.1% by mass or less.
- “lead-free” means that a lead raw material is not actively added as a glass raw material, and does not completely exclude contamination from impurities and the like. More specifically, the content of PbO in the glass composition is limited to 1000 ppm or less including contamination from impurities and the like.
- SiO 2 —B 2 O 3 —R 2 O (R is an alkali metal) -based glass, and R 2 O contains two or more of Li 2 O, Na 2 O and K 2 O. It is preferable.
- SiO 2 —B 2 O 3 —R 2 O-based glass means glass containing SiO 2 , B 2 O 3 and R 2 O (alkali metal oxide) as essential components.
- the glass composition is SiO 2 20 to 65%, Al 2 O 3 0 to 10%, B 2 O 3 10 to 40%, MgO 0 to 10%, CaO 0 to 10% by mass%. SrO 0-10%, BaO 0-10%, ZnO 0-35%, Li 2 O 0.2-10%, Na 2 O 0.5-17%, K 2 O 0-16%, TiO 2 0- It is preferable to contain 10%, ZrO 2 0 to 5%, Bi 2 O 3 0 to 25%, La 2 O 3 0 to 10%.
- each component is regulated according to the above configuration, it is possible to achieve both clarity, low-temperature encapsulating property, and adhesiveness with a metal wire without containing Sb 2 O 3 .
- BaO is preferably less than 1% by mass.
- the outer tube for semiconductor encapsulation of the present invention is characterized by comprising the above glass.
- the lead-free semiconductor encapsulating glass of the present invention contains CeO 2 , the glass is colored and emits fluorescence. For this reason, the outer tube for semiconductor encapsulation made of the glass of the present invention can be automated in appearance inspection by a machine.
- CeO 2 also functions as a fining agent, so that the amount of Sb 2 O 3 used can be reduced. Therefore, the outer tube having excellent clarification and using this can stably enclose the semiconductor element.
- the glass for encapsulating lead-free semiconductors of the present invention has a viscosity temperature of 10 6 dPa ⁇ s is 670 ° C. or lower.
- the viscosity temperature of 10 6 dPa ⁇ s generally corresponds to the sealing temperature of the semiconductor element. Therefore, the glass of the present invention can encapsulate a semiconductor element at 670 ° C. or lower.
- SiO 2 containing two or more of Li 2 O, Na 2 O, and K 2 O and B 2 O 3 as essential components It is preferable to use —B 2 O 3 —R 2 O (R is an alkali metal) glass.
- the glass of the present invention has a temperature corresponding to a viscosity of 10 6 dPa ⁇ s of 670 ° C. or lower, a temperature corresponding to a viscosity of 10 5 dPa ⁇ s of 800 ° C. or lower, further 750 ° C. or lower,
- the temperature is preferably 730 ° C. or lower
- the temperature corresponding to a viscosity of 10 4 dPa ⁇ s is preferably 870 ° C. or lower, more preferably 850 ° C. or lower, and particularly preferably 800 ° C. or lower.
- CeO 2 is a component for obtaining a mantle tube that exhibits a clarification effect and emits color and fluorescence.
- CeO 2 itself recrystallizes from the glass and becomes devitrified, which adversely affects the dimensions of the outer tube.
- the content thereof is 0.01 to 6% by mass, preferably 0.05 to 4% by mass, and more preferably 0.1 to 2% by mass.
- CeO 2 is difficult to introduce in a large amount into the glass because the devitrification property deteriorates. Therefore, when it is desired to increase the CeO 2 content, the BaO content is preferably decreased, specifically, less than 1% by mass.
- the glass for encapsulating a semiconductor include, by mass%, SiO 2 20 to 65%, Al 2 O 3 0 to 10%, B 2 O 3 10 to 40%, MgO 0 to 10%, CaO 0 ⁇ 10%, SrO 0 ⁇ 10%, BaO 0 ⁇ 10%, ZnO 0 ⁇ 35%, Li 2 O 0.2 ⁇ 10%, Na 2 O 0.5 ⁇ 17%, K 2 O 0 ⁇ 16%, TiO 2 0-10%, ZrO 2 0-5%, Bi 2 O 3 0-25%, La 2 O 3 0-10%, CeO 2 0.01-6%, Sb 2 O 3 0-0.1 % Containing glass is preferably used.
- SiO 2 is a main component and an important component for stabilizing the glass, but is also a component that raises the sealing temperature. Its content is 20 to 65%, preferably 25 to 60%, more preferably 30 to 55%. When the content of SiO 2 is too small, it becomes difficult to enjoy the effects described above. On the other hand, if the content of SiO 2 is too large, it is difficult to cold sealed.
- Al 2 O 3 is a component that increases chemical resistance, but is also a component that increases the viscosity of the glass.
- the content of Al 2 O 3 is 0 to 10%, preferably 0.1 to 8%, more preferably 0.2 to 7%.
- Al 2 O content of 3 is too large, too high the viscosity of the glass, in addition to the moldability tends to decrease, it is difficult to cold sealed.
- B 2 O 3 is a component that stabilizes the glass and is essential as a component that lowers the viscosity of the glass. It is also a component that reduces chemical resistance. Its content is 10 to 40%, preferably 12 to 35%, more preferably 14 to 30%. If the content of B 2 O 3 is too small it becomes difficult to enjoy the effects described above. On the other hand, when the content of B 2 O 3 is too large, chemical resistance is deteriorated.
- Alkaline earth metal oxides (R'O) composed of MgO, CaO, SrO, and BaO have a high effect of stabilizing the glass, but the effect of lowering the glass cannot be expected, but the encapsulation temperature may be increased. is there. Therefore, the total amount of R′O is preferably 0 to 10%, particularly 0 to 8%, more preferably 0 to 6%.
- R′O Alkaline earth metal oxides
- MgO and CaO are not essential components, and each is 0 to 10%, preferably 0 to 4%, more preferably 0 to 2%. When there is too much content of MgO and CaO, the viscosity of glass will become high. CaO has the effect of improving chemical resistance in addition to the effects common to the alkaline earth metal oxide components described above.
- SrO is not an essential component and is 0 to 10%, preferably 0 to 6%, more preferably 0 to 4%, and particularly preferably 0 to 2%. When there is too much content of SrO, the viscosity of glass will become high and melting will become difficult.
- BaO is not an essential component and is 0 to 10%, preferably 0 to 6%, more preferably 0 to 4%, and particularly preferably 0 to 2%. When there is too much content of BaO, the viscosity of glass will become high. In particular, in order to contain a large amount of CeO 2 , the content is preferably less than 1%.
- ZnO is a component excellent in the effect of reducing the viscosity of glass.
- ZnO is not an essential component, but it is preferable to contain 1% or more of ZnO in order to obtain the effects described above.
- the content of ZnO is 0 to 35%, preferably 1 to 30%, more preferably 2 to 25%, and particularly preferably 10 to 25%.
- the ratio (mass ratio) of ZnO / SiO 2 is set to 0.02 to 1, more preferably 0.05 to 0.8 in order to enhance the effect.
- a range is desirable.
- the effect can be expected at 0.02 or more, but is desirably 0.05 or more. If it is set to 1 or less, it is desirable for preventing the deopacity.
- R 2 O An alkali metal oxide (R 2 O) composed of Li 2 O, Na 2 O, and K 2 O is shown, and has an effect of reducing the viscosity of the glass or increasing the expansion.
- Li 2 O and Na 2 O are used as essential components in the glass having the above composition because they have a high effect of reducing the viscosity of the glass.
- the total amount of R 2 O is preferably 8 to 22%, particularly 10 to 20%.
- the content of Li 2 O is 0.2 to 10%, preferably 0.4 to 8%, more preferably 0.8 to 6%.
- the content of Li 2 O is too small it becomes difficult to enjoy the effects described above.
- the content of Li 2 O is too large, devitrification is deteriorated.
- the content of Na 2 O is 0.5 to 17%, preferably 1 to 15%, more preferably 2 to 13%.
- the content of Na 2 O is 0.5 to 17%, preferably 1 to 15%, more preferably 2 to 13%.
- the content of Na 2 O is too small it becomes difficult to enjoy the effects described above.
- the content of Na 2 O is too large, devitrification is deteriorated.
- K 2 O is not an essential component, but it is desirable that it is contained in some amount for stability against low temperature and devitrification.
- the content of K 2 O is 0 to 16%, preferably 0.2 to 13%, more preferably 0.4 to 12%. When the content of K 2 O is too large, devitrification is deteriorated.
- TiO 2 can be added to increase chemical resistance. TiO 2 is not an essential component, but is preferably added in an amount of 0.2% or more in order to obtain the effects described above. However, if TiO 2 is contained excessively, the glass is easily devitrified by contact with a metal or a refractory, which causes dimensional problems during molding.
- the content of TiO 2 is 0 to 10%, preferably 0.2 to 8%, more preferably 0.4 to 6%.
- ZrO 2 can be added to increase chemical resistance.
- ZrO 2 is not an essential component, but is preferably contained in an amount of 0.05% or more in order to obtain the effects described above.
- ZrO 2 is contained excessively, the viscosity of the glass becomes too high.
- glass easily devitrifies due to contact with metals and refractories, causing dimensional problems during molding.
- the content of ZrO 2 is 0 to 5%, preferably 0.05 to 4%, more preferably 0.1 to 3%.
- Bi 2 O 3 can be contained to increase chemical resistance. However, if Bi 2 O 3 is contained excessively, the glass easily devitrifies due to contact with a metal or a refractory, and causes a problem in dimensions during molding.
- the content of Bi 2 O 3 is 0 to 25%, preferably 0 to 20%, more preferably 0 to 15%.
- La 2 O 3 can be contained to improve chemical resistance. However, if La 2 O 3 is contained excessively, the glass is easily devitrified by contact with a metal or a refractory, and causes a problem in dimensions at the time of molding.
- the content of La 2 O 3 is 0 to 10%, preferably 0 to 8%, more preferably 0 to 6%.
- various components can be added as long as the properties of the glass are not impaired.
- F can be added up to 0.5% in order to reduce the viscosity of the glass.
- environmentally undesirable components such as As 2 O 3 should not be added. Incidentally the content of As 2 O 3 is limited to Sb 2 O 3 similarly to 0.1%.
- the glass for encapsulating lead-free semiconductors of the present invention preferably has a thermal expansion coefficient between 30 ° C. and 380 ° C. of 85 to 105 ⁇ 10 ⁇ 7 / ° C. for sealing with dumet.
- the volume resistance of the glass becomes low, for example, electricity slightly flows between the electrodes of the diode, resulting in a circuit as if a resistor was installed in parallel with the diode. For this reason, it is preferable that the volume resistance of glass is as high as possible.
- the volume resistance value at 150 ° C. is 7 or more, preferably 9 or more, and more preferably 10 or more in Log ⁇ ( ⁇ ⁇ cm).
- the resistance value at 250 ° C. is preferably 7 or more in terms of Log ⁇ ( ⁇ ⁇ cm).
- Manufacture of mantle tubes on an industrial scale includes a mixing and mixing process in which minerals and refined crystal powders containing components that form glass are measured and mixed, and the raw materials to be put into the furnace are prepared, and the raw materials are melted into glass. It consists of a process, a forming process for forming the molten glass into a tube shape, and a processing process for cutting the tube into predetermined dimensions.
- the raw materials are composed of minerals and impurities composed of a plurality of components such as oxides and carbonates, and may be prepared in consideration of the analytical values, and the raw materials are not limited. These are measured by weight and mixed with an appropriate mixer according to the scale, such as a V mixer, a rocking mixer, or a mixer equipped with stirring blades, to obtain an input raw material.
- an appropriate mixer according to the scale such as a V mixer, a rocking mixer, or a mixer equipped with stirring blades
- a melting furnace is a melting tank for melting glass raw material to vitrify, a clarification tank for rising and removing bubbles in the glass, and lowering the clarified glass to a viscosity suitable for molding, and leading to a molding apparatus It consists of a passage (feeder).
- a refractory material or a furnace covered with platinum is used, and it is heated by heating with a burner or electric current to glass.
- the charged raw materials are usually vitrified in a melting bath of 1300 ° C. to 1600 ° C., and further enter a clarification bath of 1400 ° C. to 1600 ° C.
- bubbles in the glass are lifted to remove the bubbles.
- the glass that comes out of the Kiyosumi pass is lowered in temperature as it moves to the molding apparatus through the feeder, and has a viscosity of 10 4 to 10 6 dPa ⁇ s suitable for glass molding.
- the glass is formed into a tubular shape with a forming apparatus.
- a molding method a Danner method, a tongue method, a downdraw method, and an updraw method can be applied.
- the outer tube for semiconductor encapsulation can be obtained by cutting the glass tube into a predetermined dimension.
- a diamond cutter as a method suitable for mass production, a large number of tube glasses are bound together and then cut with a diamond wheel cutter. A method of cutting a large number of tube glasses at a time is generally used.
- a jig is used to set an electrode material such as a dumet wire in the outer tube so that the semiconductor element is sandwiched from both sides. Thereafter, the whole is heated to a temperature of 670 ° C. or lower, the outer tube is softened and deformed, and hermetically sealed.
- a small electronic component such as a silicon diode, a light emitting diode, or a thermistor can be manufactured.
- the glass for encapsulating a semiconductor according to the present invention can be used for encapsulating a semiconductor element by, for example, forming a powder into a paste, winding it around a semiconductor element and firing it.
- Table 1 shows examples of the present invention (sample Nos. 1 to 10).
- Glass raw materials were prepared so as to have the glass composition described in the table, and were melted at 1200 ° C. for 3 hours using a platinum pot.
- Silica powder, aluminum oxide, boric acid, magnesium carbonate, calcium carbonate, strontium carbonate, zinc oxide, lithium carbonate, sodium nitrate, potassium carbonate, potassium carbonate, titanium oxide, zirconium oxide, bismuth oxide, lanthanum oxide, cerium oxide Etc. were used. Thereafter, the molten glass was poured onto a metal plate, formed into a 4 mm thick plate, and appropriately annealed. The clarity of each sample obtained was evaluated.
- the number of bubbles of 0.1 mm or more present in the central portion (measurement area 3 cm square) of each sample is counted, and “ ⁇ ” indicates that the number of bubbles is 3 or less, and “4” or 5 indicates the number of bubbles. “Fair”, and the number of bubbles of 6 or more was designated as “x”.
- the thermal expansion coefficient ⁇ is a value obtained by measuring an average linear thermal expansion coefficient in a temperature range of 30 to 380 ° C. with a self-recording differential thermal dilatometer using a cylindrical measurement sample having a diameter of about 3 mm and a length of about 50 mm.
- the strain point, sealing temperature (temperature at 10 6 dPa ⁇ s), temperature at 10 5 dPa ⁇ s, and temperature at 10 4 dPa ⁇ s were determined as follows. First, the strain point and the softening point were measured by a fiber method based on ASTM C338. Next, the temperature corresponding to the viscosity (10 4 dPa ⁇ s and 10 2.5 dPa ⁇ s) in the working point region was determined by a platinum ball pulling method. Finally, these viscosities and temperatures were applied to the Fulcher equation to calculate temperatures at 10 6 dPa ⁇ s and 10 5 dPa ⁇ s.
- the glass raw material was melted in the same manner as described above. Subsequently, the molten glass was wound up with a glass blowing rod, a glass tube having an outer diameter of 1.4 mm and an inner diameter of 0.8 mm was drawn, and then cut into 1.8 mm. Next, the jumet wire was inserted into the glass tube and heated for 10 minutes at the previously determined encapsulation temperature to obtain a jumet inclusion body sample. Using this sample, the encapsulating property, coloring property and fluorescence were evaluated. The evaluation of the encapsulating property is evaluated by observing the appearance of the jumet line. If the color tone of the jumet line is a red bean color, “ ⁇ ”, if it is brown, “ ⁇ ”, if it exhibits a metallic luster, “x”. It was.
- “ ⁇ ” indicates that strong fluorescence was generated from the glass tube
- “X” indicates that weak fluorescence was generated or fluorescence was not generated.
- evaluation may be performed using a light source with a wavelength of 254 nm, in this example, since a UV light with a wavelength of 254 nm is dangerous for the eyes, a light source with a wavelength of 365 nm was used.
- the volume resistivity at 150 ° C. is a value measured by a method according to ASTM C-657.
- the glass according to the present invention is suitable as a glass envelope material used for enclosing semiconductor elements such as thermistors, diodes, and LEDs.
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Abstract
Description
なお本発明において「無鉛」とは、ガラス原料として積極的に鉛原料を添加しないという意味であり、不純物等からの混入を完全に排除するものではない。より具体的には、ガラス組成中のPbOの含有量は、不純物等からの混入も含めて1000ppm以下に制限される。
なお、本出願は、2010年7月1日付で出願された日本特許出願(特願2010-150971)に基づいており、その全体が引用により援用される。また、ここに引用されるすべての参照は全体として取り込まれる。
Claims (5)
- 106dPa・sの粘度の温度が670℃以下であり、ガラス組成として、CeO2の含有量が0.01~6質量%であり、且つSb2O3の含有量が0.1質量%以下である無鉛半導体封入用ガラス。
- SiO2-B2O3-R2O(Rはアルカリ金属)系ガラスからなり、R2OとしてLi2O、Na2O及びK2Oのうち2種以上を含有する請求項1に記載の無鉛半導体封入用ガラス。
- ガラス組成として、質量%で、SiO2 20~65%、Al2O3 0~10%、B2O3 10~40%、MgO 0~10%、CaO 0~10%、SrO 0~10%、BaO 0~10%、ZnO 0~35%、Li2O 0.2~10%、Na2O 0.5~17%、K2O 0~16%、TiO2 0~10%、ZrO2 0~5%、Bi2O3 0~25%、La2O3 0~10%含有する請求項1又は2に記載の無鉛半導体封入用ガラス。
- BaOが1質量%未満である請求項1~3の何れかに記載の無鉛半導体封入用ガラス。
- 請求項1~4の何れかに記載のガラスからなる半導体封入用外套管。
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US13/805,039 US9230872B2 (en) | 2010-07-01 | 2011-06-17 | Lead-free glass for semiconductor encapsulation |
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JP2012111681A (ja) * | 2010-11-04 | 2012-06-14 | Nippon Electric Glass Co Ltd | 半導体封入用無鉛ガラス及び半導体封入用外套管 |
JP2012116744A (ja) * | 2010-11-11 | 2012-06-21 | Nippon Electric Glass Co Ltd | 半導体封入用無鉛ガラス及び半導体封入用外套管 |
JP6041201B2 (ja) * | 2012-10-10 | 2016-12-07 | 日本電気硝子株式会社 | 半導体封入用無鉛ガラス |
CN104193184B (zh) * | 2014-09-09 | 2016-06-22 | 福建省港达玻璃制品有限公司 | 一种自清洁钢化玻璃的制备方法 |
CN106024726B (zh) * | 2016-07-19 | 2018-12-11 | 如皋市大昌电子有限公司 | 一种用无铅玻璃封装的二极管 |
CA3117986A1 (en) | 2018-11-26 | 2020-06-04 | Owens Corning Intellectual Capital, Llc | High performance fiberglass composition with improved specific modulus |
KR20210096140A (ko) | 2018-11-26 | 2021-08-04 | 오웬스 코닝 인텔렉츄얼 캐피탈 엘엘씨 | 향상된 탄성 계수를 갖는 고성능 섬유 유리 조성물 |
CN112010561B (zh) * | 2020-09-17 | 2022-04-15 | 成都光明光电股份有限公司 | 封装玻璃 |
CN112551896A (zh) * | 2020-12-08 | 2021-03-26 | 上海华伽电子有限公司 | 一种无铅低温玻璃及其制备方法及应用该玻璃制备的二极管玻壳 |
CN114530300B (zh) * | 2022-04-21 | 2022-08-16 | 西安宏星电子浆料科技股份有限公司 | 一种无铅介质浆料 |
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