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US 11,453,793 B2Granted
Solder mask inkjet inks for manufacturing printed circuit boards
AssigneesAgfa-Gevaert, Electra Polymer Ltd.
InventorsRita Torfs, Marion Sauvageot, Johan Loccufier
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Abstract
The invention provides an inkjet method for producing a solder mask in the manufacture of a Printed Circuit Board. By using a solder mask inkjet ink containing at least one photoinitiator, at least one free radical polymerizable compound and at least one mercapto functionalized carboxylic acid as adhesion promoter, a high quality solder mask withstanding the high thermal stress during the soldering process while maintaining excellent physical properties, may be produced.
Claims12
A radiation curable solder mask inkjet ink comprising:
- a photoinitiator;
- a radical polymerizable compound;
- and
- an adhesion promoter;
- wherein
- the adhesion promoter has a chemical formula according to Formula II:
- wherein
- L2 represents an optionally substituted o+p-valent linking group including 1 to 10 carbon atoms;
- o and p independently represent an integer from 1 to 4;
- and
- Q represents atoms that form an optionally substituted 5 or 6 membered heteroaromatic ring.
8 more elements
Dependencies are inferred from the claim text.