摘要:
The present invention is directed to polymer-ceramic composites having high dielectric constants formed using polymers containing a metal acetylacetonate (acacs) curing catalyst. In particular, it has been discovered that 5 weight percent Co(III) acac can increase the dielectric constant of DER661 epoxy by about 60%. The high dielectric polymers are combined with fillers, preferably ceramic fillers, to form two phase composites having high dielectric constants. Composites having about 30 to about 90% volume ceramic loading and a high dielectric base polymer, preferably epoxy, have been discovered to have a dielectric constants greater than about 60. Composites having dielectric constants greater than about 74 to about 150 are also disclosed. Also disclosed are embedded capacitors with capacitance densities of at least 25 nF/cm2, preferably at least 35 nF/cm2, most preferably 50 nF/cm2. Methods to increase the dielectric constant of the two phase composites having high dielectric constants are also provided.
摘要翻译:本发明涉及使用含有金属乙酰丙酮(acacs)固化催化剂的聚合物形成的具有高介电常数的聚合物 - 陶瓷复合材料。 特别地,已经发现5重量%的Co(III)acac可以使DER661环氧树脂的介电常数提高约60%。 高介电聚合物与填料(优选陶瓷填料)组合以形成具有高介电常数的两相复合材料。 已经发现具有大约30至大约90体积的陶瓷负载和高电介质基础聚合物,优选环氧树脂的复合材料具有大于约60的介电常数。还公开了具有大于约74至约150的介电常数的复合材料。 还公开了具有至少25nF / cm 2,优选至少35nF / cm 2,最优选50nF / cm 2的电容密度的嵌入式电容器。 还提供了增加具有高介电常数的两相复合材料的介电常数的方法。
摘要:
Problems resulting from contamination of electronic apparatus used with silicone keypads can be eliminated or substantially reduced by soaking such keypads prior to assembly in a low molecular weight liquid hydrocarbon, particularly n-hexane. Such soaking removes low molecular weight unreactive cyclics from the keypad which might otherwise contaminate the electronic apparatus.
摘要:
In a preferred embodiment of the invention, a substrate (11) is cleaned by immersing it in an organic solvent (17) and subjecting it to acoustic energy, immersing it in alcohol, immersing it in a surfactant, subjecting it to a cascading rinse in deionized water, baking it (FIG. 3 ), and thereafter subjecting it to ultraviolet light in an ozone ambient (FIG. 4). When the foregoing steps are followed, the contact angle is significantly reduced, and an encapsulant (14) that is thereafter applied provides more reliable protection to an encapsulated device (12) from outside contaminants.
摘要:
A silicone gel encapsulated integrated circuit (12) is placed in a container, the container being partially filled with a silicone elastomer (16) which is much more rugged than the gel. After the elastomer (16) hardens, it completely covers the gel encapsulation (14) and protects it and the integrated circuit device from the effects of rough handling. The gel, however, gives all of the protection from the external environment that it would in the absence of the elastomer encapsulation.
摘要:
Devices are described in which certain crosslinked silicone polymers are incorporated. These polymers have various functions such as encapsulating agents, surface protective agents or agents to index match optical components (e.g. optical fiber, optical waveguide, etc.) to other optical devices or articles. The polymer is a vinyl-terminated dimethyldiphenylsiloxane copolymer crosslinked with tri- or tetrafunctional silanes in the presence of a platinum catalyst. The phenyl group content of the crosslinked silicone copolymer is adjusted to change the index of refraction of the polymer to the optimum for the particular application contemplated. Polymer preparation procedures are described which yield good optical quality for the polymer as well as optimum physical and chemical properties.
摘要:
In an electronic device assembly comprising at least one circuit element an encapsulant therefor, wherein the encapsulant comprises a silicone resin characterized in that subsequent to the curing of said encapsulant, the resin is coated with a fine inorganic powder such as fumed or fused silica which essentially eliminates static charge and tackiness of the surface.
摘要:
In a method of cleaning a circuit board having a silicone encapsulated hybrid integrated circuit thereon, subsequent to aqueous solder flux residue removal with an ionic detergent, the board is cleaned with a low molecular weight organic acid such as formic, acetic or oxalic acid.
摘要:
A mask for selectively transmitting therethrough a desired light radiant energy is disclosed. The mask comprises a stress-relieved, essentially dimensionally stable base, comprising a copolymer of tetrafluoroethylene and hexafluoropropylene, which is capable of transmitting therethrough the light radiant energy. A blocking film is deposited on at least a portion of the base for blocking the transmission of the light radiant energy through the portion of the base.
摘要:
A method of repairing pin holes in a defective photomask such as one comprising a patterned chromium film on a glass substrate comprises depositing an adhesion promoting film such as siloxane on the surface of the photomask, then depositing a solvent soluble layer such as a photoresist layer over the adhesion promoting layer, a window is then formed through the layers and underlying photomask in the area of the pin hole by burning through these layers by means of a laser. The exposed areas of the window are etched and a metallic film is deposited over the exposed surfaces. Finally, the photomask is treated with solvent for removing the solvent soluble photoresist which also causes the metal film deposited thereon to be removed in all areas except the area of the window.
摘要:
A no-flow reworkable epoxy underfill is provided for use in an electronic packaged system which incorporates an integrated circuit, an organic printed wire board, and at least one eutectic solder joint formed therebetween. An exemplary embodiment of the encapsulant includes: a cycloaliphatic epoxide; an organic hardener; a curing accelerator; and a fluxing agent wherein said cycloaliphatic epoxide includes a carbonate or carbamate group. The encapsulant can also include a filler, such as a silica filler. A method is also provided for forming the aforementioned reworkable epoxy underfills.