Polyvinyl Acetal Binder Resin for Low-Temperature Firing
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Solution Overview
Problem
Existing binder resins used in electronic device production, such as ethyl cellulose, have poor thermal decomposition properties, leading to high firing temperatures, deformation, and residual ash issues, which affect conductivity and printing precision.
Innovation Solution
A composition containing a miscible material of a specific compound (1) and a fluid organic material (A), which maintains moderate viscosity and stability, allowing for low-temperature firing and reduced ash residue, preventing precipitation and aggregation of electrical property-imparting materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ethyl cellulose is used as binder resin, then moderate viscosity is achieved for printing, but high firing temperature is required and ash residue increases
Solution Approach 1:
The invention changes the chemical composition parameters of the binder resin by using poly(vinyl acetal) resin with specific acetal content (5-30 mol%) instead of conventional ethyl cellulose. This parameter change enables the paste to achieve moderate viscosity for precise printing while simultaneously allowing low-temperature firing and reducing ash residue, thus resolving the contradiction between printing precision and firing temperature requirements.
Solution Approach 2:
The invention creates a composite binder resin system by combining poly(vinyl acetal) resin with specific additives and solvents. This composite material approach allows the paste to exhibit both good coating properties (moderate viscosity) and improved thermal decomposition characteristics (low firing temperature, reduced ash), simultaneously addressing both requirements that were previously contradictory.
2Ease of operation
If ethyl cellulose is used as binder resin, then coating properties are maintained, but deformation occurs at high temperature
Solution Approach 1:
The invention changes the thermal stability parameters of the binder resin by selecting poly(vinyl acetal) resin with controlled acetal content. This parameter modification allows the paste to maintain moderate viscosity for good coating properties while simultaneously improving resistance to thermal deformation during firing, thus resolving the contradiction between ease of coating and shape stability.
3Loss of substance
If poly(vinyl acetal) resin is used instead of ethyl cellulose, then ash amount is reduced, but viscosity control becomes insufficient
Solution Approach 1:
The invention precisely controls the acetal content parameter of poly(vinyl acetal) resin within 5-30 mol% range. This parameter optimization achieves the dual benefit of reducing ash amount while maintaining adequate viscosity for proper coating properties, resolving the contradiction between substance loss reduction and manufacturing precision.
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 composition achieves improved printing precision, reduced ash residue, and enhanced electrical properties by maintaining uniformity and stability, enabling low-temperature processing without deformation.
Implementation Method 1
a composition containing a miscible material of a compound (1) and a compound (A), the compound (1) being represented by Formula (1)
Implementation Method 2
the composition can be fired at lower temperatures compared to a binder resin, such as ethyl cellulose, and residual amount of ash after firing can be extremely reduced
Data Source
AI summary
Provided is a composition having moderate viscosity for coating properties and ejection properties, being applicable for firing at low temperatures, and leaving an extremely small amount of ash after firing. The composition of the present disclosure contains a miscible material of a compound represented by Formula (1) below and a compound (A) represented by Formula (A) below. In Formula (1) below, R1 represents a linear aliphatic hydrocarbon group having from 10 to 25 carbons; R2 and R3 are identical or different and represent an aliphatic hydrocarbon group having 2, 4, 6, or 8 carbons; R4 represents an aliphatic hydrocarbon group having from 1 to 8 carbons; R5 and R6 are identical or different and represent an aliphatic hydrocarbon group having from 1 to 3 carbons or a hydroxyalkyl ether group; and L1 to L3 represent an amide bond. In Formula (A) below, in the formula, Ra and Rc are identical or different and represent a hydrogen atom or an aliphatic hydrocarbon group that has from 1 to 12 carbons and may have a substituent; Rb represents an aliphatic hydrocarbon group that has from 1 to 12 carbons and may have a substituent; and the substituents are each an amino group and/or a hydroxyl group.