High-reflectivity polyester coating
View Patent ↗The present invention provides a high reflectivity lighting fixture, comprising a coated reflector and a light source. The reflector is coated with a composition that includes a cycloaliphatic group containing polyester resin and a pigment. The present invention also provides coating compositions that may be used on other articles where high reflectivity is desired.
1. A lighting fixture article, comprising: a reflector, and a light source,
wherein the reflector comprises a substrate coated with a coating composition comprising:
a binder comprising a polyester resin that includes a cycloaliphatic group, wherein the binder comprises less than 40 weight percent aromatic group containing compound, and
a pigment,
wherein the weight ratio of pigment to binder is greater than 0.9:1 and wherein the presence of the cycloaliphatic group provides improved reflectivity when the binder is blended with rutile TiO 2 at a solids loading of 50 weight percent and coated to a dried film thickness of 0.00254 cm.
2. The article of claim 1 , wherein the binder, when blended with rutile TiO 2 at a solids loading of 50 weight percent and coated to a dried film thickness of 0.00254 cm, exhibits a Y-value of at least 85.5.
3. The article of claim 2 , wherein the polyester comprises less than 15 weight percent aromatic group containing compound.
4. The article of claim 1 , wherein the polyester resin is formed from the reaction of a di- or poly-functional alcohol compound with a di- or poly-functional compound selected from the group consisting of acid, anhydride and ester compounds, wherein at least a portion of the acid, anhydride or ester compound comprises a cycloaliphatic group.
5. The article of claim 4 , wherein at least a portion of the acid, anhydride or ester compound comprises an aliphatic acid, ester or anhydride compound.
6. The article of claim 4 , wherein at least a portion of the acid, anhydride or ester compound comprises an aromatic acid, ester or anhydride compound.
7. The article of claim 4 , wherein the polyol comprises a cycloaliphatic group.
8. The article of claim 1 , wherein the polyester resin is formed from the reaction of polyols and a compound selected from the group consisting of cycloaliphatic polycarboxylic acids, esters and anhydrides.
9. The article of claim 1 , wherein the polyester resin is formed from the reaction of polyols and a compound selected from the group consisting of cyclohexanedicarboxylic acids, esters and anhydrides.
10. The article of claim 9 , wherein the binder comprises less than 20 weight percent aromatic group containing compound.
11. The article of claim 9 , wherein the pigment:binder weight ratio is at least 0.95:1.
12. The article of claim 1 , wherein the polyester resin is formed from the reaction of polyols and a compound selected from the group consisting of 1,2-, 1,3- and 1,4-cyclohexanedicarboxylic acids and their methyl esters; 1,2- isomer anhydrides; and derivatives of these compounds.
13. The article of claim 12 , wherein the binder, when blended with rutile TiO 2 at a solids loading of 50 weight percent and coated to a dried film thickness of 0.00254 cm, exhibits a Y-value of at least 86.5.
14. The article of claim 1 , wherein the polyester comprises less than 20 weight percent aromatic group containing compound.
15. The article of claim 14 , wherein the binder, when blended with rutile TiO 2 at a solids loading of 50 weight percent and coated to a dried film thickness of 0.00254 cm, exhibits a Y-value of at least 87.5.
16. The article of claim 1 , wherein the polyester comprises less than 10 weight percent aromatic group containing compound.
17. The article of claim 1 , wherein the binder further comprises a crosslinker compound.
18. The article of claim 17 , wherein the crosslinker compound is non-aromatic.
19. The article of claim 9 , wherein the pigment:binder weight ratio is at least 1:1 and less than 1.4:1.
20. The article of claim 1 , wherein the pigment comprises rutile TiO 2 .
21. A coated substrate article, comprising
a substrate coated with a coating composition, wherein the coating composition comprises:
a binder comprising a polyester resin that includes a cycloaliphatic group, wherein the binder comprises less than 40 weight percent aromatic group containing compound, and
a pigment,
wherein the weight ratio of pigment to binder is greater than 0.9:1, and
wherein the binder, when blended with rutile TiO 2 at a solids loading of 50 weight percent and coated to a dried film thickness of 0.00254 cm, exhibits a Y-value of at least 85.5.
22. A coating composition, comprising:
a binder comprising a polyester resin tat includes a cycloaliphatic group, wherein the binder comprises less than 40 weight percent aromatic group containing compound, and
a pigment,
wherein the weight ratio of pigment to binder is greater than 0.9:1, and
wherein the binder, when blended with rutile TiO 2 at a solids loading of 50 weight percent and coated to a dried film thickness of 0.00254 cm, exhibits a Y-value of at least 85.5.