公开(公告)号：US11535710B2

公开(公告)日：2022-12-27

申请号：US17197887

申请日：2021-03-10

Applicant: DUPONT ELECTRONICS, INC.

Inventor： Husnu Alp Alidedeoglu ,  Thomas Edward Carney ,  Joseph Casey Johnson ,  Lin Ju ,  Michael Thomas Kwasny ,  Laila MacLaughlin ,  Grzegorz Slawinski

IPC: C08G73/10 ,  C08K3/04 ,  C08K5/00 ,  C08K5/17 ,  C08L79/08 ,  C08J5/18

Abstract: In a first aspect, a single layer polymer film includes 60 to 99 wt % of a crosslinked polyimide, having a gel fraction in the range of from 20 to 100% and a refractive index of 1.74 or less, and 1 to 40 wt % of a colorant. A surface of the single layer polymer film has been textured and has a maximum roughness (Spv) of 6 μm or more, an L* color of 30 or less and a 60° gloss of 15 or less. In a second aspect, a coverlay for a printed circuit board includes the single layer polymer film of the first aspect. In third and fourth aspects, processes are disclosed for forming a single layer polymer film including a crosslinked polyimide film including a dianhydride and a diamine.