Dupont Electronics, Inc.

Laila MacLaughlin

Thomas Edward Carney

Joseph Casey Johnson

Husnu Alp Alidedeoglu

Scott John Herrmann

Christopher Robert Becks

Michael Thomas Kwasny

Grzegorz Slawinski

Lin Ju

In one aspect, a single layer polymer film includes 25 to 97.5 wt % of a polyimide having a refractive index of 1.74 or less, 0.5 to 20 wt % of a matting agent and 1 to 30 wt % of a black colorant. On an air side, the single layer polymer film has an L* color of 33 or less and a 60&#xb0; gloss of 10 or less. In another aspect, a single layer polymer film includes 80 to 99 wt % of a polyimide having a refractive index of 1.74 or less and 1 to 30 wt % of a black colorant. A surface of the single layer polymer film has been textured and has a maximum roughness (S) of 7 &#x3bc;m or more, an L* of 33 or less and a 60&#xb0; gloss of 10 or less.

Single layer polymer films and electronic devices

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 (S) of 6 &#x3bc;m or more, an L* color of 30 or less and a 60&#xb0; 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.

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Stoutsville, OH, United States of America

Laila MacLaughlin