Hoechst Celanese Corporation

Debasish Kuila

Michael T Sheehan

Richard Vicari

Olan S Fruchey

Mohammad Aslam

George Kvakovszky

James R Sounik

Mark A Murphy

Joseph A McDonough

Kathleen Nelson Juneau

Ahamed M Tafesh

John R Fritsch

A new class of 3,4-dihydrocoumarin derivatives which are useful as photoactive compounds in a wide variety of applications including photoresists and other opto-electronic applications are disclosed and claimed. Preferred embodiments include ether, ester, carbonate, and sulfonate derivatives of 5-hydroxy, 6-hydroxy, and 7-hydroxy-3-diazo-4-oxo-3,4-dihydrocoumarins. These compounds exhibit very high photosensitivity in the deep ultraviolet (DUV) region (ca. 250 nm), and therefore, are useful as photoactive compounds in DUV photoresist formulations.

Photoactive coumarin derivatives

Novel processes for the preparation of a new class of coumarin derivatives, which are useful as photoactive compounds in a wide variety of applications including photoresists and other opto-electronic applications, are disclosed and claimed. The process involves a multi-step synthetic method for the preparation of ether, ester, carbonate, or sulfonate derivative of 5-hydroxy, 6-hydroxy, or 7-hydroxy-3-diazo-4-oxo-3,4-dihydrocoumarin starting from the corresponding dihydroxyacetophenone. The compounds formed from the process of the present invention exhibit very high photosensitivity in the deep ultraviolet (DUV) region (ca. 250 nm), and therefore, are useful as photoactive compounds in DUV photoresist formulations.

Process for preparing photoactive coumarin derivatives

The present invention provides novel substituted pyrazines or pyrazine derivatives ('NPD') which are functional and have useful application as a monomer for a variety of high performance polymers such as polyester, polyarylate, polycarbonate, polyetherketones, epoxides, polyimides, polyamides, and polyamides-imides. These NPD have the general formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are defined herein.

Substituted pyrazines

Compounds useful as polymer stabilizers which are polymerizable into condensation polymer systems are disclosed and claimed. A particularly preferred embodiment is 1-(3'-(benzotriazol-2'-yl)-4'-hydroxyphenyl)-1,1-bis(4-hydroxyphenyl)ethan e.

Functionalized tris(hydroxyphenyl) compounds

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Corpus Christi, TX, United States of America

Debasish Kuila