| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject paste capable of being easily coated and having a low viscosity even with a high solid ratio by bringing the paste to contain dielectric powder in a specific polyimide precursor varnish. SOLUTION: The objective paste is obtained by bringing 100 pts.wt. of (A) a polyimide precursor varnish obtained by dissolving 5-80 wt.% of a mixture, which constitutes a polyimide precursor, of (i) a diamine expressed by formula I [R1 and R2 are each formula II or the like, formula III or the like; R3 and R4 are each H or a 1-5C alkyl; (m) is 0-10] with (ii) a tetracarboxylic acid (ester) expressed by formula IV (R5 to R8 are each H or a 1-5C alkyl) to contain preferably 0.5-200 pts.wt., more preferably 10-150 pts.wt. of (B) dielectric powder having preferably 0.05-10μm. The blended amount of the ingredient (i) in 100 pts.wt. of the mixture of the ingredient (i) with the ingredient (ii) is preferably 20-99 pts.wt. As the ingredient B, barium titanate, strontium titanate, etc., are cited.
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