Photoresist composition
AssigneeShipley Company, L.L.C.
InventorsStephen H. Wheeler, Randall W. Kautz, Robert K. Barr
Life of this patent
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Abstract
Disclosed are photoimageable compositions having improved stripping properties as well as methods for manufacturing printed wiring boards using such photoimageable compositions.
Claims18
A photoresist composition comprising a branched polymeric binder, a monomer and a photoactive component, wherein the branched polymeric binder comprises as polymerized units one or more difunctional branch-point monomers having two polymerizable end groups and a backbone comprising 2 or more base cleavable functionalities, provided that if the difunctional branch-point monomer is free of urethane linkages and both polymerizable end groups are (meth)acrylate esters the difunctional branch-point monomer has a molecular weight of ≧450.
A method of manufacturing a printed wiring board comprising the steps of:
- a) disposing on a printed wiring board substrate a photoresist composition comprising a branched polymeric binder, a monomer and a photoactive component, wherein the branched polymeric binder comprises as polymerized units one or more difunctional branch-point monomers having two polymerizable end groups and a backbone including 2 or more base cleavable functionalities, provided that if the difunctional branch-point monomer is free of urethane linkages and both polymerizable end groups are (meth)acrylate esters the difunctional branch-point monomer has a molecular weight of ≧450;
- b) imaging the photoresist;
- and c) developing the photoresist.
A method for forming a relief image comprising the steps of:
- a) disposing on a printed wiring board substrate a photoresist composition comprising a branched polymeric binder, a monomer and a photoactive component, wherein the branched polymeric binder comprises as polymerized units one or more difunctional branch-point monomers having two polymerizable end groups and a backbone comprising 2 or more base cleavable functionalities, provided that if the difunctional branch-point monomer is free of urethane linkages and both polymerizable end groups are (meth)acrylate esters the difunctional branch-point monomer has a molecular weight of ≧450;
- b) imaging the photoresist;
- and c) developing the photoresist.
Dependencies are inferred from the claim text.