Conductive Paste Composition for Smooth MLCC Electrode Printing
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Solution Overview
Problem
Conventional polyvinyl acetal resins used in conductive pastes for multilayer ceramic capacitors leave finer undissolved matter that is difficult to remove, leading to reduced productivity and lower electrical characteristics due to voids and dispersibility issues during the debinding and firing steps.
Innovation Solution
A conductive paste containing a polyvinyl acetal resin with specific IR absorption spectrum characteristics and hydroxy group content, optimized to minimize undissolved matter when dissolved in organic solvents, ensuring improved filtration and printability, and achieving excellent surface smoothness after printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polyvinyl acetal resin is used in conductive paste, then the paste can be formulated with standard materials, but fine undissolved matter remains that is difficult to remove by filtration
Solution Approach 1:
The patent changes the chemical parameters of the polyvinyl acetal resin by controlling the degree of polymerization (50-200) and hydroxy group content (15-30 mol%), which fundamentally alters the resin's solubility characteristics and eliminates fine undissolved matter during filtration
Solution Approach 2:
The patent creates an optimized composite system by combining polyvinyl acetal resin with specific conductive powder particles, where the resin's modified properties ensure complete dissolution and uniform distribution of conductive particles without leaving undissolved matter
2Adaptability or versatility
If conventional polyvinyl acetal resin is used, then material selection is simple, but filtration time increases due to fine undissolved matter
Solution Approach 1:
By adjusting the degree of polymerization to 50-200 and hydroxy group content to 15-30 mol%, the resin achieves optimal solubility that eliminates fine undissolved matter, thereby reducing filtration time and increasing productivity without limiting material versatility
3Ease of manufacture
If conventional polyvinyl acetal resin is used, then the paste can be prepared easily, but voids form during debinding and firing steps
Solution Approach 1:
The controlled degree of polymerization (50-200) and hydroxy group content (15-30 mol%) ensure complete resin dissolution and uniform paste composition, preventing void formation during debinding and firing while maintaining easy paste preparation
Solution Approach 2:
The resin's optimized properties prevent undissolved matter formation before the debinding step, eliminating the source of potential voids in advance and ensuring uniform electrical characteristics in the final product
4Ease of manufacture
If conventional polyvinyl acetal resin is used, then formulation is straightforward, but conductive powder dispersibility decreases
Solution Approach 1:
By optimizing the degree of polymerization to 50-200 and hydroxy group content to 15-30 mol%, the resin achieves balanced solubility and adhesion properties that enable uniform conductive powder dispersal throughout the paste while maintaining straightforward formulation procedures
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The optimized polyvinyl acetal resin reduces fine undissolved matter, enhancing filtration efficiency, printability, and surface smoothness, resulting in improved electrical characteristics and productivity for multilayer ceramic capacitors.
Implementation Method 1
a polyvinyl acetal resin; an organic solvent; and a conductive powder, the polyvinyl acetal resin having: a wavenumber A (cm−1) of a peak within a range of 3,100 to 3,700 cm−1 in an IR absorption spectrum
Data Source
AI summary
The present invention provides a conductive paste which leaves less fine undissolved matter when dissolved in an organic solvent and thus can be easily filtrated, which has excellent printability, and which can exhibit excellent surface smoothness after printing. Provided is a conductive paste used for forming an electrode of a multilayer ceramic capacitor, the conductive paste containing: a polyvinyl acetal resin; an organic solvent; and a conductive powder, the polyvinyl acetal resin having a wave number A (cm−1) of a peak within a range of 3,100 to 3,700 cm−1 in an IR absorption spectrum measured using an infrared spectrophotometer; and a hydroxy group content (mol %), the wavenumber A of the peak and the hydroxy group content satisfying relations of the following formulas (1) and (2):[(3,470−A)/Hydroxy group content]≤5.0 (1)(3,470−A)≤150 (2)wherein A is a wavenumber which is lower than 3,470 cm−1 and at which a transmittance a (%) satisfying [100−(100−X)/2] is exhibited, where X (%) is s minimum transmittance of the peak within the wavenumber range of 3,100 to 3,700 cm−1.