Methyl oxirane dibenzoylresorcinol UV absorbers
First Claim
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1. A compound having the formula ##STR3## where Ar1 and Ar2 are independently substituted or unsubstituted monocyclic or polycyclic aryl groups, R is hydrogen, or an aliphatic group having from 1 to 8 carbon atoms, and A is ##STR4##
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Abstract
An epoxylated DBR, dibenzoylresorcinol and various derivatives thereof have been prepared to show usefulness in coatings due to compatibility and solubility. Such coatings can be acrylics, epoxies, or silicone hardcoats which are thermally or photo cured thermoset, or thermoplastic coating materials in a variety of solvent types. The disclosed UV absorber also has the advantage of a higher molecular weight and lower volatility than DBR alone thus providing processing advantages.
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Citations
15 Claims
- 1. A compound having the formula ##STR3## where Ar1 and Ar2 are independently substituted or unsubstituted monocyclic or polycyclic aryl groups, R is hydrogen, or an aliphatic group having from 1 to 8 carbon atoms, and A is ##STR4##
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7. A compound having the formula
- 8. A UV absorbing coating composition comprising a transparent thermoplastic or thermosetting polymeric matrix material and a UV absorbing compound selected from the group consisting of 2-(methyloxirane)-4,6-dibenzoylrescorcinol, 2-(3-hydroxy-2-methoxypropyl)-4,6-dibenzoylresorcinol, 2-(2-hydroxy-3-methoxypropyl)-4,6-dibenzoylresorcinol, 2-hydroxymethyl-5-hydroxy-6,8-dibenzoyl-2,3-dihydrobenzofuran, 2-(2,3-dihydroxypropyl)-4.6-dibenzoylresorcinol, and 2,2-dimethyl-5- (2,6-dihydroxy-3,5-dibenzoylphenyl)methyl!-1,3-dioxolane.
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14. A UV absorbing coating composition comprising a transparent thermoplastic or thermosetting polymer matrix material and 2-hydroxymethyl-5-hydroxy-6,8-dibenzoyl-2,3-dihydrobenzofuran.
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15. A coated article comprising a solid substrate and coating on the surface thereof comprising a thermoplastic or thermosetting transparent matrix material and a UV absorbing compound selected from the group consisting of 2-(methyloxirane)-4,6-dibenzoylrescorcinol, 2-(3-hydroxy-2-methoxypropyl)-4,6-dibenzoylresorcinol, 2-(2-hydroxy-3-methoxypropyl)-4,6-dibenzoylresorcinol, 2-hydroxymethyl-5-hydroxy-6,8-dibenzoyl-2,3-dihydrobenzofuran, 2-(2,3-dihydroxypropyl)-4,6-dibenzoylresorcinol, and 2,2-dimethyl-5- (2,6-dehydroxy-3,5-dibenzoylphenyl)methyl!-1,3-dioxolane.
Specification