Radiation crosslinkable polyesters and polyesterethers
AssigneeE. I. Du Pont de Nemours and Company
InventorMarion Burg
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Abstract
Solvent-soluble polymeric esters and polymeric esterethers with radiation-crosslinkable ethylenic unsaturation in the linear polymeric structure, and recurring pendant hydroxyl groups, are derived from monomers which include diepoxides and monomers with at least one .alpha.,.beta.-unsaturated carboxylic acid group. These polymeric products react with cyclic anhydrides to form aqueous alkaline-soluble polymers which are useful as films for photomechanical processes, including lithographic applications and as photoresists.
Claims22
A class of condensation polymers composed of radiation-sensitive, film-forming, linear polyesters and polyesterethers having within the polymeric backbone a multiplicity of repeating units of the formula:
- ##STR7## wherein R.sub.2 is a divalent aryl, alkyl, aralkyl, or cycloalkyl radical having two to twenty carbon atoms, which radical may be substituted with a C.sub.1 to C.sub.10 alkyl or cycloalkyl, aryl, or halogen group;
- and wherein R.sub.3 is a divalent aryl, aroyl, arylacryloyl, furylacryloyl, pyridylacryloyl, or thienylacryloyl group in which the aromatic unit for aryl is phenyl, biphenyl, or naphthyl and wherein one of the of the R.sub.3 cyclic carbon atoms is directly attached to the .beta.-carbon of the .alpha.,.beta.-ethylenic ester group of the repeating unit, and wherein the aromatic unit of the R.sub.3 group can be substituted with a C.sub.1 to C.sub.8 alkyl or cycloalkyl, aryl, aralkyl, or halogen group.
A process for preparing a photosensitive polymer which comprises reacting equimolar amounts of 1,4-phenylenediacrylic acid and resorcinol diglycidyl ether, under anhydrous conditions, in the presence of a basic catalyst, followed by reacting said polyester with succinic anhydride to form a semi-ester.
Dependencies are inferred from the claim text.