Curable composition for ink-jet printing, cured object, and printed wiring board
Provided are a curable composition for inkjet, which not only allows surface curability in formation of a coating film by an inkjet system to be enhanced, but also is not reduced in characteristics conventionally provided, such as solder heat resistance and gold plating resistance, and a cured product and a printed wiring board using the curable composition. The curable composition for inkjet of the present invention includes (A) an alkylene chain-containing bifunctional (meth)acrylate compound, (B) an α-aminoalkylphenone-based photopolymerization initiator, and (C) an acylphosphine oxide-based photopolymerization initiator, wherein, when the thickness is 10 μm, the absorbance at a wavelength of 365 nm is 0.08 to 0.8 and the absorbance at a wavelength of 385 nm is 0.05 to 0.3.
1. A curable composition for inkjet, comprising:
an alkylene chain-containing bifunctional (meth)acrylate compound;
an α-aminoalkylphenone-based photopolymerization initiator;
an acylphosphine oxide-based photopolymerization initiator;
a bisphenol type epoxy (meth)acrylate compound;
a hydroxyl group-containing (meth)acrylate compound; and
a thermosetting component comprising a block isocyanate,
wherein the hydroxyl group-containing (meth)acrylate compound comprises at least one monofunctional (meth)acrylate compound selected from the group consisting of 2-hydroxy-3-phenoxyethyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, and 1,4-cyclohexane dimethanol monoacrylate, the α-aminoalkylphenone-based photopolymerization initiator has a compounding rate that is higher than a compounding rate of the acylphosphine oxide-based photopolymerization initiator such that when the thickness is 10 μm, the curable composition has an absorbance which is 0.17 to 0.8 at a wavelength of 365 nm and 0.09 to 0.3 at a wavelength of 385 nm.
2. The curable composition for inkjet according to claim 1 , wherein the alkylene chain-containing bifunctional (meth)acrylate compound has an alkylene chain including 4 to 12 carbon atoms.
3. The curable composition for inkjet according to claim 1 , wherein the block isocyanate of the thermosetting component is in an amount of 1 to 30 parts by mass with respect to 100 parts by mass of the curable composition.
4. The curable composition for inkjet according to claim 1 , wherein the curable composition has a viscosity at 50° C. of 50 mPa·s or less.
5. A cured product obtained by a process including curing the curable composition for inkjet according to claim 1 .
6. A printed wiring board, comprising:
the cured product of claim 5 .
7. A cured product obtained by a process including curing the curable composition for inkjet according to claim 2 .
8. A cured product obtained by a process including curing the curable composition for inkjet according to claim 3 .
9. A cured product obtained by a process including curing the curable composition for inkjet according to claim 4 .
10. A printed wiring board, comprising:
the cured product of claim 7 .
11. A printed wiring board, comprising:
the cured product of claim 8 .
12. A printed wiring board, comprising:
the cured product of claim 9 .
13. The curable composition for inkjet according to claim 1 , wherein the block isocyanate of the thermosetting component is in an amount of 1 to 30 parts by mass with respect to 100 parts by mass of the curable composition and comprises a trifunctional block isocyanate.
14. The curable composition for inkjet according to claim 1 , wherein the compounding rate of the α-aminoalkylphenone-based photopolymerization initiator is in a range of 1 to 10 parts by mass with respect to 100 parts by mass of the curable composition.
15. The curable composition for inkjet according to claim 1 , wherein the alkylene chain-containing bifunctional (meth)acrylate compound has a compounding rate in a range of 20 to 90 parts by mass with respect to 100 parts by mass of the curable composition, and the compounding rate of the α-aminoalkylphenone-based photopolymerization initiator is in a range of 1 to 10 parts by mass with respect to 100 parts by mass of the curable composition.
16. The curable composition for inkjet according to claim 1 , wherein the bisphenol type epoxy (meth)acrylate compound has a compounding rate in a range of 5 to 30 parts by mass with respect to 100 parts by mass of the curable composition, the alkylene chain-containing bifunctional (meth)acrylate compound has a compounding rate in a range of 20 to 90 parts by mass with respect to 100 parts by mass of the curable composition, and the compounding rate of the α-aminoalkylphenone-based photopolymerization initiator is in a range of 1 to 10 parts by mass with respect to 100 parts by mass of the curable composition.
17. The curable composition for inkjet according to claim 1 , wherein the bisphenol type epoxy (meth)acrylate compound has a compounding rate in a range of 5 to 30 parts by mass with respect to 100 parts by mass of the curable composition, the hydroxyl group-containing (meth)acrylate compound has a compounding rate in a range of 1 to 20 parts by mass with respect to 100 parts by mass of the curable composition, the alkylene chain-containing bifunctional (meth)acrylate compound has a compounding rate in a range of 20 to 90 parts by mass with respect to 100 parts by mass of the curable composition, and the compounding rate of the α-aminoalkylphenone-based photopolymerization initiator is in a range of 1 to 10 parts by mass with respect to 100 parts by mass of the curable composition.
18. The curable composition for inkjet according to claim 1 , wherein the bisphenol type epoxy (meth)acrylate compound has a compounding rate in a range of 5 to 30 parts by mass with respect to 100 parts by mass of the curable composition, the hydroxyl group-containing (meth)acrylate compound has a compounding rate in a range of 2 to 10 parts by mass with respect to 100 parts by mass of the curable composition, the alkylene chain-containing bifunctional (meth)acrylate compound has a compounding rate in a range of 20 to 90 parts by mass with respect to 100 parts by mass of the curable composition, and the compounding rate of the α-aminoalkylphenone-based photopolymerization initiator is in a range of 1 to 10 parts by mass with respect to 100 parts by mass of the curable composition.
19. The curable composition for inkjet according to claim 1 , wherein the alkylene chain-containing bifunctional (meth)acrylate compound has a viscosity at 25° C. in a range of 5 to 50 mPa·s.
20. The curable composition for inkjet according to claim 17 , wherein the alkylene chain-containing bifunctional (meth)acrylate compound has a viscosity at 25° C. in a range of 5 to 50 mPa·s.