Dupont Electronics, Inc.

Michael Thomas Kwasny

Kostantinos Kourtakis

Joseph Casey Johnson

Michael Henry Howard, Jr

Thomas Edward Carney

Gene M Rossi

Husnu Alp Alidedeoglu

Kenneth Hernandez

Laila MacLaughlin

Grzegorz Slawinski

Benjamin Samson

Michael Mulzer

Lin Ju

In a first aspect, a coating solution includes a soluble polymer and a crosslinking precursor. The soluble polymer includes an imide group. The crosslinking precursor includes a first amine group that is either reactive or passivated towards crosslinking and one or more additional amine groups, wherein the one or more additional amine groups has been passivated towards crosslinking such that the crosslinking precursor can be chemically converted, thermally converted, photo-converted or dissociated to form at least two reactive amines. In a second aspect, a process for forming a polymer film includes: (a) casting a coating solution, (b) activating the crosslinking precursor using an external stimulus to form at least two reactive amines and crosslink the polymer, and (c) drying the polymer film. The coating solution includes a soluble polymer, including an imide group, and a crosslinking precursor.

Coating solutions and crosslinked polymer films

In a first aspect, a polymer composition includes a first polymer derived from a soluble polymer composition having an imide group and a Treducing compound having an amine group. The first polymer has a glass transition temperature that is lower than a second polymer derived from the same soluble polymer composition, but without a Treducing compound having an amine group. In a second aspect, a coating solution includes a soluble polymer having an imide group and a Treducing compound having an amine moiety that can be an amine or a first masked amine that can be converted to an amine, wherein the first masked amine can be chemically converted, thermally converted, photo-converted or dissociated.

Polymer compositions and coating solutions

In a first aspect, a polyimide film includes a dianhydride and a diamine. The dianhydride, the diamine or both the dianhydride and the diamine include an alicyclic monomer, an aliphatic monomer or both an alicyclic monomer and an aliphatic monomer. The polyimide film has a b* of 1.25 or less and a yellowness index of 2.25 or less for a film thickness of 50 &#x3bc;m. The polyimide film is formed by: (a) polymerizing the dianhydride and the diamine in the presence of a first solvent to obtain a polyamic acid solution; (b) imidizing the polyamic acid solution to form a substantially imidized solution; (c) casting the substantially imidized solution to form a film; and (d) drying the film.

Polyimide 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.

Single layer polymer films and electronic devices

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Columbus, OH, United States of America

Michael Thomas Kwasny