Single layer polymer films and electronic devices

US11535710B2 · kind B2 · utility

Assignee

• DUPONT ELECTRONICS, INC. · US

Inventors

• Husnu Alp Alidedeoglu · Newburgh, US
• Thomas Edward Carney · Harrisburg, US
• Joseph Casey Johnson · Pickerington, US
• Lin Ju · Grove City, US
• Michael Thomas Kwasny · Columbus, US
• LAILA MACLAUGHLIN · Stoutsville, US
• Grzegorz Slawinski · Fairborn, US

Key dates

• Filing date: Mar 10, 2021
• Grant date: Dec 27, 2022
• Expiry date: Jul 1, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2203/206
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.