EP3707113A1 - Composition for producing an aqueous coating compound - Google Patents
Composition for producing an aqueous coating compoundInfo
- Publication number
- EP3707113A1 EP3707113A1 EP18733297.8A EP18733297A EP3707113A1 EP 3707113 A1 EP3707113 A1 EP 3707113A1 EP 18733297 A EP18733297 A EP 18733297A EP 3707113 A1 EP3707113 A1 EP 3707113A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- component
- calcium
- magnesium
- composition according
- aluminum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
- C04B28/342—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition as a mixture of free acid and one or more reactive oxides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
Definitions
- the invention relates to a composition which can be converted into an aqueous, hydraulically curable preparation usable as a coating composition.
- the aqueous encapsulant may be used to prepare a hydraulically-cured enclosure of an electronic component.
- electronic component includes passive electronic components and, as representatives of electronic components with active electronic components, in particular semiconductor modules and, under the latter, in particular power electronic assemblies.
- Semiconductor modules are understood herein to mean electronic or power electronic assemblies comprising at least one substrate (as a circuit carrier), at least one semiconductor component (semiconductor) and optionally at least one passive electronic component.
- the at least one semiconductor component may in this case already be partially or completely pre-enveloped, for example with an epoxy resin-based jacket.
- substrates examples include IMS substrates (insulated metal substrates), direct copper bonded substrates (DCB), active metal brazing substrates (AM B), ceramic substrates, metal-ceramic substrates, printed circuit boards (PCBs) and leadframes ,
- semiconductor devices are diodes, light emitting diodes, dies (semiconductor chips), IGBTs (insulated-gate bipolar transistors, insulated gate bipolar transistors), ICs (integrated circuits, integrated circuits) and MOSFETs (metal-oxide-semiconductor field-effect transistors, metal oxide semiconductor field-effect transistors).
- the semiconductor component (s) is, in particular, heat that develops considerably during normal operation as a result of power loss, ie. without cladding and unscapsulated self-destructive temperatures of, for example, 100 to> 200 ° C reaching semiconductors.
- Examples of passive electronic components are sensors, bottom plates, heat sinks, resistors, capacitors, transformers, chokes and coils.
- the term "hydraulic curing” as used herein includes setting in the presence of water or after the addition of water.
- Powdered compositions and aqueous coating compositions in the form of phosphate cement which can be prepared therefrom are disclosed, for example, in WO 2015/193035 A1.
- Enclosures of electronic components made from such aqueous phosphate cement cladding compositions are particularly useful for electrical isolation and heat dissipation from the electronic component to the outside during operation.
- the pot life (processing period, duration of processability) of aqueous phosphate cement coating compositions can be extended in an unexpectedly synergistic manner by addition of a combination of certain hydroxycarboxylic acids, for example by 5 to 120 minutes.
- a certain total maximum amount of alkali metal and NhU cations in aqueous phosphate cement coating compositions or covers of electronic components produced therewith occurs, the occurrence of leakage currents on active electronic components enveloped in this way respectively the occurrence of dendrite growth on active and / or passive electronic components can be largely suppressed.
- the invention thus consists in the use of a combination of certain hydroxycarboxylic acids in alkali and low-NH 4 + compositions for the production as a coating mass of usable aqueous hydraulically curable phosphate cement preparations.
- the invention relates to a composition consisting of the components:
- (A) 1 to 30 wt .-% (weight%) of a 1 to 90 wt .-% aqueous phosphoric acid (HsP0 4 ) and / or at least one hydrogen phosphate selected from the group consisting of mono- and dihydrogen phosphates of magnesium, calcium , Aluminum, zinc, iron, cobalt and copper,
- component (e) may comprise one or more alkali metal and / or NhU salts of hydroxycarboxylic acids in a total amount of up to ⁇ 0.5% by weight, based on the total composition.
- alkali as used herein means sodium and / or potassium
- Each of components (a) to (e) may comprise one or more different ingredients, hereinafter also referred to as sub-components.
- the constituent (a) comprising 1 to 30% by weight, preferably 2 to 15% by weight, of the composition according to the invention is at least one substance selected from the group consisting of 1 to 90% by weight aqueous phosphoric acid ( aqueous solution consisting of 1 to 90% by weight of phosphoric acid and 100% by weight of water), magnesium monohydrogenphosphate, calciummonohydrogenphosphate, aluminummonohydrogenphosphate, zincmonohydrogenphosphate, ironmonohydrogenphosphate, cobaltmonohydrogenphosphate, coppermonohydrogenphosphate, magnesiumdihydrogenphosphate, calciumdihydrogenphosphate, aluminumdihydrogenphosphate, Zinc dihydrogen phosphate, egg dihydrogen phosphate, cobalt dihydrogen phosphate and copper dihydrogen phosphate.
- aqueous phosphoric acid aqueous solution consisting of 1 to 90% by weight of phosphoric acid and 100% by weight of water
- magnesium monohydrogenphosphate magnesium monohydrogenphosphate, calciummonohydrogenphosphate, aluminummon
- it is 1 to 90 wt .-% aqueous phosphoric acid and / or at least one hydrogen phosphate selected from the group consisting of mono- and dihydrogenates of magnesium, calcium, aluminum, zinc, iron, cobalt and Copper.
- it is at least one hydrogen phosphate selected from the group consisting of mono- and dihydrogen phosphates of magnesium and aluminum.
- the constituent (a) or its subcomponents are preferably solid particles, for example having particle sizes in the range of up to 1 mm.
- the constituent (b) constituting from 1 to 40% by weight, preferably from 2 to 15% by weight, of the composition according to the invention is at least one compound selected from the group consisting of oxides, hydroxides and hydrated oxides of magnesium, calcium, iron , Zinc and copper, in particular at least one compound selected from the group consisting of magnesium oxide, iron oxide and calcium oxide.
- Magnesium oxide is particularly preferred.
- Component (b) or its subcomponents are preferably solid particles, for example having particle sizes in the range of up to 0.3 mm.
- the constituent (c) constituting from 40 to 95% by weight, preferably from 65 to 90% by weight of the composition according to the invention, is at least one particulate filler selected from the group consisting of glass; Mono-, oligo- and polyphosphates of magnesium, calcium, barium and aluminum; Calcium sulfate; barium sulfate; simple and complex silicates comprising calcium, aluminum, magnesium, iron and / or zirconium; simple and complex aluminates comprising calcium, magnesium and / or zirconium; simple and complex titanates comprising calcium, aluminum, magnesium, barium and / or zirconium; simple and complex zirconates comprising calcium, aluminum and / or magnesium; zirconia; titanium dioxide; alumina; Silica, in particular in the form of silica and quartz; silicon carbide; aluminum; Boron nitride and silicon nitride. Zirconium silicate, silica and quartz are preferred.
- the preceding paragraph distinguishes between simple and complex silicates, aluminates, titanates and zirconates.
- the complex representatives are not complex compounds, but rather silicates, aluminates, titanates and zirconates, with more than one type of cations, such as calcium aluminosilicate, lead zirconium titanate, etc.
- the particle sizes of component (c) or its subcomponents are, for example, in the range from 20 nm to 0.3 mm or even from 20 nm to 1 mm.
- the constituent (d) comprising from 0.5 to 12% by weight, preferably from 1 to 6% by weight, of the composition according to the invention is at least two solid hydroxycarboxylic acids, ie a combination of at least two different hydroxycarboxylic acids, for example citric acid in combination with tartaric acid or citric acid in combination with malic acid or tartaric acid in combination with malic acid or citric acid in combination with tartaric acid and malic acid.
- solid hydroxycarboxylic acids exist as stereoisomers
- any of these stereoisomers may be used alone or in any combination.
- solid hydroxycarboxylic acid used herein as a per se solid hydroxycarboxylic acid in contrast to non-solid or liquid hydroxycarboxylic acids.
- each of the solid hydroxycarboxylic acids of component (d) comprises at least 20% by weight of component (d).
- Component (d) or its subcomponents are preferably solid particles, for example having particle sizes in the range of up to 1 mm.
- the component (e) constituting 0 to 15% by weight, preferably 0 to 8% by weight or 2 to 8% by weight of the composition of the present invention is one or more of the components (a) to (a) (d) different components.
- examples include in particular additives such as flow improvers, defoamers, wetting agents and adhesion promoters.
- Component (s) may contain one or more alkali metal and / or NH 4 salts of hydroxycarboxylic acids in a proportion of up to ⁇ 0.5% by weight, in each case based on the total, of constituents (a) to (e) existing composition according to the invention.
- Component (s) or the composition according to the invention preferably does not comprise any alkali and / or NH 4 salts of hydroxycarboxylic acids.
- the component (s) or its subcomponents are preferably solid particles, for example having particle sizes in the range of up to 0.3 mm or even up to 1 mm. It is possible that constituent (e) is not solid, but is, for example, liquid or comprises non-solid, for example liquid, subcomponents.
- the proportion of alkali plus NhU cations based on the total composition of the invention is ⁇ 1 wt .-%, in particular ⁇ 0.5 wt .-%.
- the composition according to the invention is preferably free of such cations.
- the term "free of alkali plus NhU cations" means avoiding the deliberate use or addition of such cations of broad-spectrum substances to the composition of the invention; the presence of such cations in terms of technically unavoidable impurities, for example, in trace amounts;
- the presence of alkali metal and / or NhU salts of hydroxycarboxylic acids or of alkali metal and / or NhU cations in the abovementioned only small proportion or the absence of such substances in the composition according to the invention and aqueous produced therefrom is unavoidable Enveloping masses or sheaths of electronic components allows a substantial suppression of leakage currents to active electronic components or the occurrence of dendrite growth on active and / or passive electronic components.
- Tartaric acid and citric acid for example in a 1: 1 weight ratio
- composition according to the invention consists of components (a) to (e), ie the percentages by weight of components (a) to (e) add up to 100% by weight of the composition according to the invention. If no constituent (s) is present, the wt .-% - proportions of components (a) to (d) add up to 100 wt .-% of the composition according to the invention.
- composition of the invention comprising ingredients (a) to (d) and (a) to (e), respectively, may be used as a one-component mixture, i. be prepared as a ready prepared composition.
- constituent (a) comprises phosphoric acid
- a one-component composition according to the invention can only be stored for a short time, for example only up to 2 hours.
- one-component compositions according to the invention are preferably provided in particulate form, for example in powder form.
- the constituents (a) to (d) or (a) to (e) are intimately mixed with one another in the one-component particulate composition according to the invention, in particular as a stochastically homogeneous mixture.
- the one-component particulate composition preferably shows no lump formation and is free-flowing.
- composition according to the invention as a one-component system
- the components of the two-component or multi-component system are preferably present in a provision quantity corresponding to the abovementioned quantity ratio of constituents (a) to (d) or (a) to (e), in other words, ready portioned and thus immediately without weighing or measuring can be mixed together to form the composition according to the invention.
- constituent (a) comprises phosphoric acid
- such a one-component composition according to the invention, as mentioned above, can only be stored for a short time.
- the separate two or more components to be mixed with one another and optionally with separately provided water to prepare the final composition according to the invention are preferably provided in particulate form, for example in powder form.
- particulate form for example in powder form.
- more than one, so two or more different constituents and / or subcomponents comprehensive particulate or powdery components of the two- or multi-component system are present as an intimate mixture, in particular as a stochastic homogeneous mixture; such particulate components preferably show no lump formation and are free-flowing.
- Both the particulate one-component composition according to the invention and also particulate components of the two-component or multi-component composition according to the invention can be prepared by customary processes known to the person skilled in the art for producing free-flowing particulate compositions.
- tumble mixing, intensive mixing, dry grinding and air blending are mentioned as the production process.
- an aqueous hydraulic curable composition which can be used as a coating composition.
- an aqueous hydraulically curable composition of the type in question does not contain an excess of acid; in other words, in general, the basic constituent (b) may be of the type and amount so as to completely neutralize, preferably over-neutralize, the acid equivalents provided by component (a) and any further acid equivalents from components (c) and (e) can.
- the composition according to the invention may in itself be or form an aqueous, hydraulically curable preparation in the aforementioned sense, ie it is then a composition according to the invention which is not or no longer required for mixing with separately provided water.
- compositions of the present invention having a component (a) comprising a correspondingly large amount of a low concentration aqueous phosphoric acid.
- a relevant composition prepared by mixing the two or more components of the invention may optionally already be an aqueous hydraulically curable preparation in the aforementioned sense or represent such, without requiring mixing with separately provided water. In other embodiments, however, the addition of or mixing with separately provided water is required.
- compositions according to the invention with a constituent (a) which comprises phosphoric acid but at the same time only a small amount of water.
- the composition of the present invention may be mixed with separately provided water to form an aqueous hydraulically curable composition.
- the speech It is necessary to mix them with separately provided water, in particular if the entirety of the constituents of the composition according to the invention comprises no or too little water in order to produce a mixture of all constituents without addition of separately provided water to an aqueous hydraulically curable preparation which can be used as an aqueous coating mass with an initial viscosity, for example in the range of 2 to 25 Pa-s.
- an initial viscosity for example in the range of 2 to 25 Pa-s.
- 100 parts by weight of the inventive one-component and preferably particulate composition can be mixed with 5 to 30 parts by weight, preferably 6 to 15 parts by weight of water.
- its individual components and the separately prepared water can be mixed together in any order, optionally also in portions. If separately added water is added, of course, a desired ratio of composition according to the invention and water must be observed, for example the abovementioned amount ratio of 100 parts by weight of the composition according to the invention: 5 to 30, preferably 6 to 15 parts by weight of water.
- aqueous premixes may be aqueous solutions, for example aqueous solutions of components (a), (d) or (e) or any sub-components thereof. It may be expedient to prepare aqueous premixes with constituent (b) and at least one acid constituent (in the presence of water H30 + ions) or subcomponent selected from constituents (a), (c), (d), and (e) respectively, to produce subcomponents thereof no longer than, for example, up to 24 hours prior to final mixing into the aqueous hydraulically curable composition.
- constituent (b) or subcomponents of constituent (b) but comprising aqueous premixtures which are free from acidic constituents or subcomponents; It is expedient here to prepare such premixes no longer than, for example, up to 48 hours before the final mixing into the aqueous, hydraulically curable preparation.
- Examples of mixing methods which can be used in the final mixing to form the aqueous, hydraulically curable preparation using the two-component or multicomponent composition according to the invention are stirring and intensive mixing, for example intensive mixing using planetary mixers.
- aqueous hydraulically curable composition obtainable by mixing the one-component or multicomponent composition according to the invention with or, if required, without the use of separately provided water is characterized by a synergistically extended pot life, for example in the range from 10 to 120 minutes.
- the pot life is defined as the time to doubling the initial viscosity of the aqueous hydraulically curable composition.
- the viscosity ie the initial viscosity and the increasing viscosity over time, can be measured, for example, by means of rotational viscometry (continuous measurement of the viscosity with the following measurement conditions: plate-plate measuring principle, plate diameter 25 mm, measuring gap 1 mm, sample temperature 20 ° C., constant shear rate 36 min "1).
- the initial viscosity after 5 minutes counted from the first contacting of the invention Composition or water is measured or, if mixing with separately provided water is not required, from the finished position of the composition according to the invention, which in itself is already the aqueous, hydraulically curable preparation, the initial viscosities li For example, in the range of 1 - 50 Pa-s.
- aqueous, flowable and hydraulically curable composition can be used as an aqueous encapsulant for electronic components.
- aqueous coating composition will be used in the following.
- the aqueous encapsulant may be used to make a hydraulically-cured enclosure of electronic components.
- the manufacturing process comprises the steps:
- step (3) wrapping the electronic component provided in step (1) with the aqueous enveloping mass provided in step (2), and
- step (3) hydraulically curing the aqueous encapsulant enveloping the electronic component after completion of step (3).
- an electronic component to be enveloped is provided, for example a passive electronic component or a semiconductor module, the latter in particular in the form of a power electronic module.
- step (2) With respect to step (2), reference is made to the aforementioned.
- step (3) is carried out immediately, for example within 60 minutes, preferably within 10 minutes after completion of step (2).
- the encapsulation of the electronic component provided in step (1) is performed with the aqueous encapsulant provided in step (2).
- Preferred application methods are casting, dipping and injection molding. Potting can be carried out by means of customary methods known to the person skilled in the art, for example by gravity, pressure-assisted or pressure-reduced potting. It may be appropriate to enclose the electronic component to be wrapped with Haibschalenformen and then fill with the pourable coating mass. The wrapping can be done as a partial or complete wrapping.
- the cladding material partially or completely envelopes electrical contacting elements connected to the semiconductor component, such as, for example, bonding wires, ribbons and / or a substrate.
- partial cladding means that one or more of the contacting elements is incomplete and / or one or more of the contacting elements are not enveloped, while full cladding means that all contacting elements are completely enveloped.
- the potting may, however, also take place, for example, such that the coating mass is formed as a "glob-top" known to the person skilled in the art.
- step (4) following step (3), the aqueous encapsulating compound surrounding the electronic component is hydraulically hardened. More specifically, the substantial part of the hydraulic hardening takes place up to the setting in step (4); Of course, the hydraulic hardening has already begun from the moment in which the components (a) and (b) have come into contact with each other in the presence of water, i. already in the course of step (2). During and after the actual setting, drying may take place in the sense of removing water or water. Setting and drying can take place, for example, for 30 to 300 minutes in a temperature range of, for example, 20 to 300 ° C.
- the coated electronic component may be removed after the hydraulic hardening according to step (4) and opening the half shells.
- the invention also relates to an electronic component enveloped by the method comprising steps (1) to (4).
- Examples 1 -7 are also relates to an electronic component enveloped by the method comprising steps (1) to (4). Examples 1 -7
- the powdery solid compositions described in the following tables were weighed into a cup with a screw cap. After closing the beaker, the respective composition was homogenized manually by shaking and then added to water introduced in a second beaker and homogenized within 5 minutes by intensive stirring. The mixing ratio was in each case 100 parts by weight of solid composition: 10 parts by weight of water.
- aqueous preparations of all Examples 1 -7 were in each case as aqueous coating composition for casting with aluminum bonding wires (400 ⁇ AI-H14CR Soft from Heraeus) contacted semiconductor diodes (SKCD 81 C 170 I HD from Semikron) on a DCB substrate in the form of a square glob -tops (19 x 18 x 3 mm 3 ) used. After casting, the parts were stored for 1 hour in a closed container at 60 ° C and then cured for 3 hours at 160 ° C in a drying oven.
- aluminum bonding wires 400 ⁇ AI-H14CR Soft from Heraeus
- semiconductor diodes SKCD 81 C 170 I HD from Semikron
- the occurrence of leakage currents or their strength was measured by applying a voltage applied to both diode poles blocking voltage of 500 V with an ESD test multimeter (Hochohmmeter Metriso 2000 from the company Warm beer) from the corresponding resistors.
- the corresponding non-cast diode with a blocking current of 5 ⁇ served as a reference.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Sealing Material Composition (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17200564 | 2017-11-08 | ||
PCT/EP2018/067535 WO2019091604A1 (en) | 2017-11-08 | 2018-06-29 | Composition for producing an aqueous coating compound |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3707113A1 true EP3707113A1 (en) | 2020-09-16 |
Family
ID=60452366
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18733297.8A Withdrawn EP3707113A1 (en) | 2017-11-08 | 2018-06-29 | Composition for producing an aqueous coating compound |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3707113A1 (en) |
WO (1) | WO2019091604A1 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4786328A (en) * | 1987-07-16 | 1988-11-22 | American Stone-Mix, Inc. | Magnesium phosphate cement systems |
EP2958139B1 (en) | 2014-06-18 | 2020-08-05 | Heraeus Deutschland GmbH & Co. KG | Method of manufacturing a semiconductor module |
-
2018
- 2018-06-29 EP EP18733297.8A patent/EP3707113A1/en not_active Withdrawn
- 2018-06-29 WO PCT/EP2018/067535 patent/WO2019091604A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2019091604A1 (en) | 2019-05-16 |
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