Patent ID: 11878487
Assignee: NITTO DENKO CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC B  C  H | IPC B  C  H

Claim 0:
1. A porous polyimide resin film for a metal layer laminate board used in lamination of a metal layer having
a minimum thermal expansion coefficient X in a plane direction perpendicular to a thickness direction and a thermal expansion coefficient Z in the thickness direction,
wherein the porous polyimide resin film is a reaction product of a diamine component and an acid dianhydride component,
wherein the diamine component includes a plurality of aromatic rings and an ester bond disposed between the aromatic rings, and
wherein a ratio (Z/X) of the thermal expansion coefficient Z in the thickness direction to the minimum thermal expansion coefficient X is 3.5 or less.