Radiation curable Michael addition resins having built-in photoinitiators
View Patent ↗The liquid, uncrosslinked, UV-curable Michael addition resins and blends of the present invention exhibit performance properties that make them very effective coating materials and these properties can be modified greatly depending upon composition. Michael donors and acceptors can be constructed from Type I and/or Type II photoinitiators and can be included in the coating compositions disclosed to make UV-curable coatings with extraordinary photoreactivity and properties. Resins can be produced that show excellent adhesion to metals, plastics, wood, paper and glass. They exhibit wide ranges of hardness, toughness, flexibility, tensile strength, stain resistance, scratch resistance, impact resistance, solvent resistance, etc. Almost any desired coating performance parameter can be attained by proper selection of raw material building blocks.
1. A liquid, uncrosslinked, UV-curable Michael addition product, comprising a reaction product of multifunctional acrylate Michael acceptor and a Type I and/or Typo II photoinitiator-modified β-dicarbonyl Michael donor selected from the group consisting of
a. a Michael donor containing a Type I photoactive moiety having the mixed structures
b. a Michael donor containing a Type II photoactive moiety having the structure, including isomers
where W, X, Y and/or Z are, independent of each other, a halogen, hydrogen, alkyl alkoxy, aryl, amino, alkylamino, nitrile, nitro, sulpho-, or phospho-group;
c. a Michael donor containing a Type II photoactive moiety having the structure, including isomers
where W, X, Y and/or Z are, independent of each other, a halogen hydrogen, alkyl, alkoxy, aryl, amino, alkylamino, nitrile, nitro, sulpho-, or phospho-group;
d. a Michael donor containing a Type II photoactive moiety having the structure, including isomers
where W, X, Y and/or Z are, independent of each other, a halogen, hydrogen, alkyl, alkoxy, aryl, amino, alkylamino, nitrile, nitro, sulpho-, or phospho-group, and R is a simple alkyl or aryl group;
e. a Michael donor containing a Type II photoactive moiety having the structure, including isomers
where W, X, Y and/or Z are, independent of each other, a halogen, hydrogen, alkyl, alkoxy, aryl, amino, alkylamino, nitrile, nitro, sulpho-, or phospho-group; and
f. a modified Michael donor containing a Type II photoactive moiety having the structure, including isomers
where W, X, Y and/or Z are, independent of each other, a halogen, hydrogen, alkyl, alkoxy, aryl, amino, alkylamino, nitrile, nitro, sulpho-, or phospho-group.
2. The Michael addition product of claim 1 wherein the Michael acceptor is a photo-initiator modified Michael acceptor.
3. The Michael addition product of claim 1 , wherein the Michael acceptor is a mixture of a multifunctional acrylate and a multifunctional acrylate.
4. The Michael addition product of claim 1 , wherein the Michael acceptor is a diacrylate, a triacrylate, a tetreacrylate or mixtures thereof.
5. A composition comprising the Michael addition product of claim 1 and an amine synergist
6. A composition comprising the Michael addition product of claim 1 and a catalyst.
7. A composition comprising the Michael addition product of claim 1 and a reactive diluent.
8. The coating comprising the cured, crosslinked residue of the Michael addition product of claim 1 .
9. The coating of claim 8 , wherein the Michael addition product is cured by exposure to actinic radiation.
10. An article, comprising;
A. a substrate, and
B. a cured, crosslinked residue of the Michael addition product of claim 1 .
11. The article of claim 10 , wherein the substrate is metal, plastic, wood, paper or glass.
12. The Michael addition product of claim 1 , having an excess of Michael acceptor equivalents relative to Michael donor equivalents.
13. A modified β-dicarbonyl Michael donor containing a Type I and/or Type II photoactive moiety selected from the group consisting of
a. a Michael donor containing a Type I photoactive moiety having the mixed structures
b. a Michael donor containing a Type II photoactive moiety having the structure, including isomers
where W, X, Y and/or Z are , independent of each other, a halogen, hydrogen, alkyl, alkoxy, aryl, amino, alkylamino, nitrile, nitro, sulpho-, or phospho-group;
c. a Michael donor containing a Type II photoactive moiety having the structure, including isomers
where W, X, Y and/or Z are, independent of each other, a halogen hydrogen, alkyl, alkoxy, aryl, amino, alkylamino, nitrite, nitro, sulpho-, or phospho-group;
d. a Michael donor containing a Type II photoactive moiety having the structure, including isomers
where W, X, Y and/or Z are, independent of each other, a halogen, hydrogen, alkyl, alkoxy, aryl, amino, alkylamino, nitrile, nitro, sulpho-, or phospho-group, and R is a simple alkyl or and group;
e. a Michael donor containing a Type II photoactive moiety having the structure, including isomers
where W, X, Y and/or Z are, independent of each other, a halogen, hydrogen, alkyl, alkoxy, aryl, amino, alkylamino, nitrile, nitro, sulpho-, or phospho-group; and
f. a modified Michael donor containing a Type II photoactive moiety having the structure, including isomers
where W, X, Y and/or Z are, independent of each other, a halogen, hydrogen, alkyl, alkoxy, aryl, amino, alkylamino, nitrile, nitro, sulpho-, or phospho-group.