E.i. Dupont De Nemours and Company

Other

Karuppiah Chandrasekaran

Mark R McKeever

James William O'Neil

The durability of ink jet print heads is improved when the intermediate photoresist layer contains a poly(amic acid) prepared from at least one dianhydride and at least one aliphatic diamine.

Ink jet heads having photoresist layer containing poly (amic acid)

The ink jet print head has a sandwich structure of a top plate, a bottom plate, and a dry film photoresist intermediate layer that defines liquid pathways and discharge orifices. The photoresist layer contains a phosphorus compound having substituted or unsubstituted alkyl or aryl groups having 6 to 10 carbons. The ink jet print head photoresist layers containing these phosphorus compounds exhibit durable bonds to the top and bottom plates of the print head and excellent ink resistance.

Ink jet print head photoresist layer having durable adhesion

The use of a two layer photoimageable, aqueous processable, resist with a hydrophic binder in the outermost layer provides a permanent coating highly resistant to printed circuit processing chemicals. This resistance results in levels of adsorbed or absorbed ionic contamination less than 14 micrograms per square inch.

Aqueous processable, multilayer, photoimageable permanent coatings for

The use of a two layer photoimageable, aqueous processable, resist with an amphoteric binder in the layer laminated directly to a printed circuit board provides a permanent coating with improved adhesion throughout the lamination process while maintaining other desirable properties such as storage stability and circuit encapsulation.

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Sayre, PA, United States of America

Karuppiah Chandrasekaran