申请人:Sekisui Chemical Co., Ltd.
公开号:EP3121829A1
公开(公告)日:2017-01-25
The present invention provides a conductive paste that has excellent printability, that can provide a printed electrode with a smooth surface, and that is excellent in storage stability. The present invention relates to a conductive paste used for formation of an electrode of a multilayer ceramic capacitor, the conductive paste including: a polyvinyl acetal resin that contains a carboxylic acid-modified polyvinyl acetal resin; an organic solvent; and a conductive powder, the polyvinyl acetal resin having an average degree of polymerization of 200 to 800, an carboxyl group content of 0.05 to 1 mol%, a hydroxy group content of 16 to 24 mol%, an acetyl group content of 0.1 to 3 mol%, and an acetoacetal group content of not more than 25 mol%, the carboxylic acid-modified polyvinyl acetal resin having at least one of a structural unit that has a carboxyl group represented by the formula (1-1) and a structural unit that has a carboxyl group represented by the formula (1-2):
in the formula (1-1), R1 and R2 each independently representing a C0-C10 alkylene group, X1 and X2 each independently representing a hydrogen atom, a metal atom, or a methyl group, in the formula (1-2), R3, R4, and R5 each independently representing a hydrogen atom or a C1-C10 alkyl group, R6 representing a C0-C10 alkylene group, X3 representing a hydrogen atom, a metal atom, or a methyl group.
本发明提供了一种导电浆料,该浆料具有优异的印刷性,可以提供表面光滑的印刷电极,并且具有优异的储存稳定性。本发明涉及一种用于形成多层陶瓷电容器电极的导电浆料,该导电浆料包括:含有羧酸改性聚乙烯醇缩醛树脂的聚乙烯醇缩醛树脂;有机溶剂;以及导电粉末,聚乙烯醇缩醛树脂的平均聚合度为 200 至 800,羧基含量为 0.羧基含量为 0.05 至 1 摩尔%,羟基含量为 16 至 24 摩尔%,乙酰基含量为 0.1 至 3 摩尔%,乙酰乙醛基含量不超过 25 摩尔%,羧酸改性聚乙烯醇缩醛树脂具有至少一种具有由式 (1-1) 表示的羧基的结构单元和具有由式 (1-2) 表示的羧基的结构单元:
在式 (1-1) 中,R1 和 R2 各自独立地代表一个 C0-C10 亚烷基,X1 和 X2 各自独立地代表一个氢原子、一个金属原子或一个甲基,在式 (1-2) 中,R3、R4 和 R5 各自独立地代表一个氢原子或一个 C1-C10 亚烷基,R6 代表一个 C0-C10 亚烷基,X3 代表一个氢原子、一个金属原子或一个甲基。