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Method for producing chain-like metal powder, chain-like metal powder produced by the method and anisotropy electric conductive film using the powder

A technology of metal powder and manufacturing method, applied in the field of chain metal powder, can solve the problems of not very high insulation resistance, uncontrollable chain length, uneven chain length, etc., achieving less branches, improving sphericity and affinity improved effect

Inactive Publication Date: 2007-06-06
SUMITOMO ELECTRIC IND LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0022] However, even the chain-shaped metal powders produced by these methods have more or less branches, and cannot be completely branchless.
In addition, since the chain length cannot be controlled by the above method, the produced chain metal powder becomes a product with irregular chain lengths mixed with extremely long chain lengths to extremely short chain lengths.
[0023] Therefore, for example, when using a chain-shaped metal powder with somewhat branched and irregular chain lengths as the conductive component of the anisotropic conductive film, even if the chain-shaped metal powder is oriented in the thickness direction of the film, there may be a problem in the direction of the film surface. The insulation resistance is not very high

Method used

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  • Method for producing chain-like metal powder, chain-like metal powder produced by the method and anisotropy electric conductive film using the powder
  • Method for producing chain-like metal powder, chain-like metal powder produced by the method and anisotropy electric conductive film using the powder
  • Method for producing chain-like metal powder, chain-like metal powder produced by the method and anisotropy electric conductive film using the powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～13

[0243] 91.5 g (0.30 mol) of trisodium citrate dihydrate and 11.0 g (0.04 mol) of nickel sulfate hexahydrate were dissolved in 715 ml of pure water to prepare an aqueous metal ion solution. In addition, as a reducing agent aqueous solution, a 20% by weight titanium tetrachloride acidic aqueous solution (pH 4) of hydrochloric acid was injected into one of the two-cell electrolytic cells separated by an anion exchange membrane manufactured by Asahi Glass Co., Ltd. Add an aqueous sodium sulfate solution with a molar concentration of 0.1M in another tank, and impregnate a graphite felt electrode (Carbon Felt Electrode) in each solution. ), with the aqueous solution side of titanium tetrachloride as the cathode, and the aqueous solution of sodium sulfate as the anode, a direct current of 3.5V is passed through under constant voltage control, and the aqueous solution is subjected to cathodic electrolytic treatment, thereby preparing to reduce a part of Ti(IV) 80.0 g of the liquid...

Embodiment 14

[0268] Two kinds of solid epoxy resins (models 6099 (resin A) and 6144 (resin B) manufactured by Asahi Kasei Co., Ltd.) and microcapsule latent curing agent [model HX3721 (curing agent) manufactured by Asahi Kasei Co., Ltd. Ratio with the ratio of resin A / resin B / curing agent=70 / 30 / 40, be dissolved in the mixed solvent that the weight ratio of butyl acetate and methyl isobutyl ketone is 75 / 25, prepare resin component, namely resin A . A resin solution in which the total concentration of the components of resin B and curing agent 3 is 40% by weight.

[0269] The chain-shaped metal powder produced in Example 10 was mixed with the resin solution to make the filling rate 0.5% by volume, and stirred and uniformly dispersed using a centrifugal mixer, thereby producing a liquid compound for anisotropic conductive film. Material.

[0270] After coating the above composite material on the PET film with a doctor blade, heat at 80°C for 5 minutes while applying a 40mT magnetic fie...

Embodiment 15

[0282] After dissolving 60.0 ml of 25% ammonia water and 1.0 g of Celna D-735 in pure water, if necessary, add pure water to adjust the total amount to 200 ml to prepare an aqueous dispersant solution. In addition, in order to adjust the pH of the entire reaction solution to 10, the amount of ammonia water was adjusted to an optimum value.

[0283] Mix all the same metal ion aqueous solution produced in Example 1 with all the same reducing agent aqueous solution produced in Example 1, stir at 23 ± 1° C. for 20 minutes, and then put it into the container placed between a pair of opposing magnets. In the reaction tank, continuously apply a 100mT magnetic field to the liquid while maintaining the liquid temperature at 35°C. In this state, use a stirring bar to stir the liquid in the reaction tank for 4 to 5 times, and at the same time add the liquid in advance at one time. Temperature rises to 35 ℃ of all above-mentioned dispersant aqueous solution, after making the reaction ...

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Abstract

A chain metal powder, which is free from branches and has a small distribution of the chain length, can be produced by a process of reducing metal ions contained in an aqueous solution, while applying a magnetic field to the solution containing ferromagnetic ions, in the presence of a polymer compound comprising repeating units of the formula (1): and repeating unit of the formula (2): or repeating unit of the formula (4); or a process which comprises the steps of reducing metal ions contained in an aqueous solution, while applying a magnetic filed to the solution, in the presence of both a reducing agent capable of generating a gas during the reduction of metal ions and a foamable water soluble compound, through the generation of a gas, a bubble layer on the surface of the aqueous solution to form a chain metal powder, separating the bubble layer formed on the surface of the aqueous solution from the solution, and collecting the chain metal powder contained in the bubble layer.

Description

technical field [0001] The present invention relates to a method for producing a chain-shaped metal powder having a shape in which many fine metal particles are connected in a chain, a chain-shaped metal powder produced by the method, and an anisotropic conductive film using the chain-shaped metal powder . technical background [0002] In a method of electronic mounting that mounts a semiconductor component (パツケージ) on a printed wiring board or electrically connects conductor circuits formed on the surfaces of two printed wiring boards, and simultaneously fixes the two printed wiring boards to each other, there is A method using an anisotropic conductive film in the form of a thin film. [0003] For example, when mounting a semiconductor package, prepare a semiconductor package in which a plurality of electrodes called bumps are arranged on the mounting surface of the printed wiring board to form a connection portion and a printed wiring board as follows: In the semiconduct...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00H01B5/16H01B5/00B82B3/00C08F222/02H01F1/06
Inventor 桑原铁也年冈英昭柏原秀树小山惠司坂井隆
Owner SUMITOMO ELECTRIC IND LTD
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