UV curable coatings having improved weatherability
First Claim
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1. A UV curable coating composition comprising:
- a) at least one photoinitiator selected from the group consisting of acylphosphine oxides, Michler'"'"'s ketone, benzil, 2-chlorothioxanthone, and mixtures thereof;
b) at least one photopolymerizable UV absorber having ethylenic unsaturation;
c) at least one UV curable acrylic monomer; and
d) silica;
wherein said photoinitiator has the ability to absorb a significant portion of the total energy needed to cure said coating from wavelengths in which said UV absorber does not appreciably absorb.
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Abstract
UV curable coatings comprising at least one photoinitiator and at least one photopolymerizable UV absorber, wherein the photoinitiator has the ability to absorb a significant portion of the total energy needed to cure the coating from wavelengths in which the UV absorber does not appreciably absorb.
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Citations
32 Claims
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1. A UV curable coating composition comprising:
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a) at least one photoinitiator selected from the group consisting of acylphosphine oxides, Michler'"'"'s ketone, benzil, 2-chlorothioxanthone, and mixtures thereof; b) at least one photopolymerizable UV absorber having ethylenic unsaturation; c) at least one UV curable acrylic monomer; and d) silica; wherein said photoinitiator has the ability to absorb a significant portion of the total energy needed to cure said coating from wavelengths in which said UV absorber does not appreciably absorb. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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2. The UV curable coating composition of claim I wherein said UV absorber comprises a photopolymerizable benzophenone.
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23. A UV curable coating composition comprising:
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a) a photoinitiator having the ability to absorb energy from wavelengths above 380 nm; b) a photopolymerizable UV absorber having the ability to absorb energy from the range of wavelengths of less than about 340-360 nm and does not appreciably absorb energy above about 380 nm; c) at least one UV curable acrylic monomer; and d) silica. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification