Manufacturing printed circuit boards using uv free radical curable inkjet inks

A manufacturing method for a printed circuit board comprising the steps of:

• inkjet printing a UV free radical curable inkjet ink onto a substrate;
• UV curing the UV free radical curable inkjet ink on the substrate;
• and
• applying a thermal treatment to the UV free radical curable inkjet ink printed and cured on the substrate;
• wherein
• the UV free radical curable inkjet ink includes at least a colorant, a free radical photoinitiator, a difunctional monomer or oligomer, a polyfunctional monomer or oligomer, and 1 to 15 wt % of a silane compound according to Formula (I):
• wherein
• the linking group L represents a —CH2— group or an aliphatic chain having 2 to 10 carbon atoms optionally substituted in the aliphatic chain by nitrogen or oxygen;
• R1 represents a methoxy group;
• R2 and R3 independently represent a methoxy group or a C1- to C4-alkyl group;
• and
• R4 represents a functional group selected from the group consisting of an epoxy group, an amine group, a carbamate group, a trimethoxy silane group, and an ureido group.

A UV free radical curable inkjet ink comprising:

• a colorant;
• a free radical photoinitiator;
• a difunctional monomer or oligomer;
• a polyfunctional monomer or oligomer;
• and
• 1 to 15 wt % of a silane compound according to Formula (I):
• wherein
• the linking group L represents a —CH2— group or an aliphatic chain having 2 to 10 carbon atoms optionally substituted in the aliphatic chain by nitrogen or oxygen;
• R1 represents a methoxy group;
• R2 and R3 independently represent a methoxy group or a C1- to C4-alkyl group;
• and
• R4 represents a functional group selected from the group consisting of an epoxy group, an amine group, a carbamate group, a trimethoxy silane group, and an ureido group.