Radiation curable inkjet ink for manufacturing printed circuit boards

Patent metadata

Field	Value
Publication number	US-2022010156-A1
Application number	US-201917295288-A
Country	US
Kind code	A1
Filing date	Nov 15, 2019
Priority date	Nov 20, 2018
Publication date	Jan 13, 2022
Grant date	—

Abstract

A radiation curable inkjet ink comprising a polymerizable compound and an adhesion promoter characterized in that the adhesion promoter has a chemical structure according to Formula I,whereinR1 is selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group and a substituted or unsubstituted aryl or heteroaryl group,R2 and R3 are independently selected from the group consisting of a hydrogen and a substituted or unsubstituted alkyl group,L represents an n+m+o valent linking group,n represents an integer ranging from 1 to 9,m represents an integer ranging from 1 to 9,o represents an integer ranging from 0 to 8, with the proviso that n+m+o is less than or equal to 10,X represents an oxygen or NR4,R4 is selected from the group consisting of a hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group and a substituted or unsubstituted aryl or heteroaryl group.

First claim

1 .- 15 (canceled)

16 . A radiation curable inkjet ink comprising a polymerizable compound and an adhesion promoter, wherein the adhesion promoter has a chemical structure according to Formula I,

wherein
R 1 is selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group and a substituted or unsubstituted aryl or heteroaryl group,
R 2 and R 3 are independently selected from the group consisting of hydrogen and a substituted or unsubstituted alkyl group,
L represents an n+m+o valent linking group, wherein
n represents an integer ranging from 1 to 9,
m represents an integer ranging from 1 to 9,
o represents an integer ranging from 0 to 8, and
n+m+o is less than or equal to 10,

X represents oxygen or NR 4 , and
R 4 is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group and a substituted or unsubstituted aryl or heteroaryl group.

17 . The radiation curable inkjet ink according to claim 16 , wherein R 1 is a substituted or unsubstituted alkyl group.

18 . The radiation curable inkjet ink according to claim 16 , wherein R 2 and R 3 are independently selected from the group consisting of hydrogen and a methyl group.

19 . The radiation curable inkjet ink according to claim 16 , wherein X represents oxygen.

20 . The radiation curable inkjet ink according to claim 16 , wherein n+m+o is 3 or 4 .

21 . The radiation curable inkjet ink according to claim 16 , wherein n and m are each independently 1 or 2.

22 . The radiation curable inkjet ink according to claim 16 , wherein the polymerizable compound is selected from the group consisting of acryloyl morpholine, cyclic trimethyl propene formol acrylate, isobornyl acrylate, dipropylene glycol diacrylate, trimethylol propane tri acrylate, 2-(vinylethoxy)ethyl acrylate, and combinations thereof.

23 . The radiation curable inkjet ink according to claim 16 , further comprising a phenolic resin or a hydroxystyrene based resin.

24 . The radiation curable inkjet ink according to claim 16 , further comprising a colorant.

25 . The radiation curable inkjet ink according to claim 16 , further comprising a flame retardant.

26 . A method of manufacturing a Printed Circuit Board (PCB) comprising an inkjet printing step wherein a radiation curable inkjet ink as defined in claim 16 is jetted and cured on a substrate.

27 . The method according to claim 26 , wherein curing is carried out using UV radiation.

28 . The method according to claim 26 , wherein an etch resist is provided on a metal surface in the inkjet printing step.

29 . The method according to claim 26 , wherein a solder mask is provided in the inkjet printing step.

30 . The method according to claim 29 , further comprising a heating step.

31 . A method of manufacturing comprising:
inkjet printing, including jetting a radiation curable inkjet ink onto a substrate; and curing the radiation curable inkjet ink on the substrate; wherein the radiation curable inkjet ink comprises a polymerizable compound and an adhesion promoter, and wherein the adhesion promoter has a chemical structure according to Formula I,

wherein
R 1 is selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group and a substituted or unsubstituted aryl or heteroaryl group,
R 2 and R 3 are independently selected from the group consisting of hydrogen and a substituted or unsubstituted alkyl group,
L represents an n+m+o valent linking group, wherein
n represents an integer ranging from 1 to 9,
m represents an integer ranging from 1 to 9,
o represents an integer ranging from 0 to 8, and
n+m+o is less than or equal to 10,

X represents oxygen or NR 4 , and
R 4 is selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group, a substituted or unsubstituted alkaryl group, a substituted or unsubstituted aralkyl group and a substituted or unsubstituted aryl or heteroaryl group.

32 . The method according to claim 31 , wherein curing comprises applying UV radiation to the radiation curable inkjet ink on the substrate.

33 . The method according to claim 31 , wherein the substrate is metal and wherein the inkjet printing comprises applying an etch resist on a surface of the metal substrate to form a protected area thereon.

34 . The method according to claim 31 , wherein the substrate is a dielectric substrate and wherein the inkjet printing comprises applying a solder mask on a surface of the dielectric substrate to form a protected area thereon.

35 . The method according to claim 34 , further comprising applying a heat treatment to the solder mask.

Assignees

• Agfa Gevaert Nv

Inventors

• Loccufier Johan
• Torfs Rita
• Sauvageot Marion

Classifications

• H05K3/125

  by ink-jet printing · CPC title

• C09D11/101 Primary

  Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing · CPC title

• H05K3/061

  Etching masks · CPC title

• C09D11/38 Primary

  characterised by non-macromolecular additives other than solvents, pigments or dyes · CPC title

• C09D11/52

  Electrically conductive inks · CPC title