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This solvent system consists of a mixture of two solvents, each solvent having a different absorption rate into the green sheet.
English (United States)
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Synergistic Paste Solvent System For Fine Line Screening on Green
This solvent system consists of a mixture of two solvents, each solvent
having a different absorption rate into the green sheet.
The conductive paste formulation is very critical for fine line screening of
patterns on green ceramic sheets. In screening, via diameter, line height and
width uniformity must be controlled while maintaining a low defect level.
In this solvent system for a conductive paste, the system
consists of a mixture of two solvents, i.e., a first solvent with a
slow absorption rate into the supporting green sheet and a second
solvent with a fast absorption rate into the green sheet. A solvent
having the necessary slow absorption rate is TEXANOL*. A solvent
having a fast absorption rate into the green sheet is butyl
CARBITOL** acetate. Both of the solvents must be compatible with the
resin used for the paste, for example, ethyl cellulose resin. The
proportion of the solvents can be varied to optimize the results
depending on the line density, the mask type, and the green sheet
* Trademark of Eastman Chemical Co.
**Trademark of Union Carbide Corp.