E.i. Dupont De Nemours and Company

Other

Mark R McKeever

Haixin Yang

Karuppiah Chandrasekaran

James William O'Neil

Thomas Kevin Foreman

The invention is directed to a photoimageable composition comprising:

Cationically polymerizable photoimageable thick film compositions, electrodes, and methods of forming thereof

The invention is directed to a photo-imageable composition precursor, the precursor composition comprising:

Aqueous developable photoimageable compositions for use in photo-patterning methods

A polymeric film composition, which can readily be applied to a sheet-configured substrate and which resists creep at room temperature, even when the sheet/film combination is stored as a roll, is disclosed. The polymeric film composition has a viscosity of at least 3&times;10 Pa-s at a predetermined first lower temperature and at a shear stress of 10,000 Pa and a viscosity no greater than 1&times;10 Pa-s at a predetermined second higher temperature and at a shear stress of 50,000 Pa.

Polymeric film compositions having controlled viscosity response to temperature and shear

Photopolymerizable compositions having improved sidewall geometry and development latitude

Minimization of developed photosensitive compositions is realized through use of a photoinitiator of hexaarylbiimidazole compound having at least one hydrophilic group.

Process for the continuous liquid processing of photosensitive compositions having reduced levels of residues

Photopolymerizable compositions and associated elements and processes are disclosed herein that upon imaging afford improved sidewall geometry and development latitude. These compositions contain a polymeric binder having the formula:

Photopolymerizable compositions having improved sidewall geometry and

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.

A photosensitive composition comprising a photooxidant, leuco dye and a substituted hydroxylamine compound of the formula R.sub.1 R.sub.2 NOH wherein R.sub.1 and R.sub.2, e.g., are alkyl, cyclic alkyl, aryl, aralkyl, alkaryl and R.sub.1 and R.sub.2 taken together form a heterocyclic ring of 5 to 7 carbon atoms. Optionally monomers and polymeric binders can be present. The compositions are useful for photoimaging and in solvent and aqueous developable resist-forming films.

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Sayre, PA, United States of America

Mark R McKeever