An inter-laminar adhesive film is provided for multi-layer printed wiring boards, the film being attached to an internal-layer circuit board where the film is embedded in an internal-layer circuit. A process of producing a multi-layer printed wiring board using the film is also provided.
The adhesive film facilitates simultaneous and integral coating of an internal-layer circuit pattern and resin filling into through-holes and/or superficial via holes in a build-up process of producing a multi-layer printed wiring board in which a conductor circuit layer and an insulation layer are alternately laminated together.
The adhesive film for multi-layer printed wiring boards, comprises a support film base and a resin composition which is solid at ambient temperature, both to be laminated on an internal-layer circuit board, wherein the resin composition which is solid at ambient temperature contains at least 10% by weight of a resin with a lower softening point than the lamination thickness of the conductor in the internal-layer circuit and the resin flow of the resin composition at the lamination temperature is at least of the thickness of the conductor of the internal-layer circuit, or is of the depth of a superficial via hole if present in the internal-layer circuit, or is 1/2 fold or more the depth of a through-hole in the internal-layer circuit singly or in combination with a superficial via hole.
提供了一种用于多层印刷线路板的层间粘合薄膜,该薄膜附着在内层电路板上,薄膜嵌入内层电路中。此外,还提供了一种使用该薄膜生产多层印刷线路板的工艺。
在生产导体电路层和绝缘层交替层压在一起的多层印刷电路板的堆积过程中,该胶膜有助于同时整体涂覆内层电路图案,并将
树脂填充到通孔和/或表面通孔中。
用于多层印刷线路板的粘合膜包括支撑膜基和在环境温度下为固态的
树脂组合物,两者都要层压在内层线路板上,其中在环境温度下为固态的
树脂组合物含有至少 10%(按重量计)的
树脂,其软化点低于内层线路中导体的层压厚度,
树脂组合物在层压温度下的
树脂流动至少为内层线路中导体的厚度、或相当于表层通孔的深度(如果内层电路中存在表层通孔),或相当于内层电路中单独或与表层通孔组合的通孔深度的 1/2 倍或以上。