Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Reexamination Certificate
2006-12-20
2009-11-17
Berman, Susan W (Department: 1796)
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Radiation sensitive composition or product or process of making
C522S115000, C522S083000, C522S088000, C522S071000, C522S076000, C522S078000, C522S064000, C430S286100
Reexamination Certificate
active
07618766
ABSTRACT:
The present invention is directed to phosphorus containing (or “halogen free”) flame retardant photoimagable compositions useful as a coverlay material in a flexible electronic circuitry package. These compositions are generally photosensitive and comprise phosphorus containing acrylates and phosphorus-containing photo-initiators mixed with a polymer binder. The compositions of the present invention typically comprise elemental phosphorus in an amount between, and including, any two of the following numbers 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.4, 3.6, 3.8, 4.0, 4.2, 4.4, 4.6, 4.8, 5.0, 5.2, 5.4, 5.6, 5.8 and 6.0 weight percent.
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Berman Susan W
E. I. du Pont de Nemours and Company
Kaeding Konrad S.
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