Waterborne photoresists made from urethane acrylates
AssigneeAdvanced Coatings International
InventorSteven M. Johnson
Life of this patent
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Abstract
A waterborne photoimageable composition or photoresist comprises a latex binder polymer based on a waterborne dispersion of a photopolymerizable urethane acrylate oligomer having sufficient carboxylic acid functionality to render it develop able in alkaline aqueous solution and a photo initiator chemical system and other components to produce an aqueous coatable and alkali develop able photoresist composition.
Claims35
A method of forming a photoimageable photoresist comprising the steps of:
- coating a substrate to form a film with a waterborne photoimageable composition, wherein said composition comprises by weight about 30-98% of a waterborne dispersion of an aliphatic urethane acrylate oligomer, about 1-25% photoinitiator, about 1-40% neutralizing base and an effective amount of a water soluble diacrylate monomer, wherein said aliphatic urethane acrylate oligomer and said diacrylate monomer form a latex;
- and
- drying said coated substrate.
A method of forming a photoimageable photoresist comprising the steps:
- coating a substrate to form a film with a waterborne photoimageable composition comprising between about 30 percent and about 98 percent by weight of a waterborne dispersion of an aliphatic urethane acrylate oligomer having both anionic and non-ionic moieties, said anionic moieties comprising carboxylic acid;
- an effective amount of a photoinitiator which generates free radicals upon exposure to light;
- a neutralizing base;
- and an acid functionalized methacrylate oligomer neutralized with said base, said aliphatic urethane acrylate oligomer and said methacrylate oligomer form a latex;
- and
- allowing the coated substrate to dry.
A method of forming a photoimageable photoresist comprising the steps:
- coating a substrate to form a film with a waterborne photoimageable composition comprising between about 30 percent and about 98 percent by weight of a waterborne dispersion of an aliphatic urethane acrylate oligomer having both anionic and non-ionic moieties, said anionic moieties comprising carboxylic acid;
- an effective amount of a photoinitiator which generates free radicals upon exposure to light;
- a neutralizing base;
- and an effective amount of colorant;
- and
- drying the photoimageable composition.
Dependencies are inferred from the claim text.