UV-curable silicone compositions and anti-dust coating compositions containing same
View Patent ↗Provided in various embodiments are methods for making ultraviolet radiation curable (UV-curable) silicone compositions and the UV-curable silicone compositions prepared by such methods. Provided in various embodiments are methods for making anti-dust coatings using such UV-curable silicone compositions and the anti-dust coatings using such UV-curable silicone compositions prepared by such methods. The UV-curable silicone compositions may be used in the coating of silicone-based articles for LED packages, encapsulants, lamps, luminaires, optical articles and the like, substantially reducing and/or eliminating the pick-up of dust and improving optical properties of the silicone-based articles.
1. A UV-curable silicone composition comprising:
(a) a silicone resin having the general formula:
((CH 3 ) 3 SiO 1/2 ) x [(RSiO 3/2 ) a (RR 1 SiO 2/2 ) b (RR 1 R 2 SiO 1/2 ) c ] y (SiO 4/2 ) z
wherein each R is an epoxy group, R 1 and R 2 are each independently an alkyl group or an aryl group, x, y, z>0, x+y+z=1, a+b+c=y, 0≤a≤y, 0≤b≤y, and 0≤c≤y, a+b>0, and a+b≤y; and
(b) a cationic photoinitiator.
2. The UV-curable silicone composition of claim 1 , wherein R is an epoxy group containing a three member oxirane ring selected from a 3-glycidoxypropyl group or a 2-(3,4-epoxycyclohexyl)ethyl group.
3. The UV-curable silicone composition of claim 1 , wherein the UV-curable silicone composition is mixed with one or more epoxy monomers or polymers.
4. The UV-curable silicone composition of claim 1 , wherein the UV-curable silicone composition includes a filler.
5. A cured composition comprising the UV-curable silicone composition of claim 1 .
6. A substrate coated with the cured composition of claim 5 , wherein the substrate is an optically clear silicone substrate.
7. A method for preparing an anti-dust coating comprising spray coating, dip coating, or spin coating the UV-curable silicone composition according to claim 1 on a surface of a substrate to form a liquid coating thereon, and curing the coating by ultraviolet radiation.
8. An anti-dust coating prepared by the method of claim 7 .
9. An article comprising the anti-dust coating of claim 8 , wherein the article is an LED package, encapsulant, lamp, luminaire, or optical article.
10. A UV-curable silicone composition according to claim 1 applied onto an optically clear substrate as an anti-dust coating to reduce dust attraction.
11. A method of coating a substrate with an anti-dust coating comprising
a. applying the UV-curable silicone composition of claim 1 onto a substrate to form a liquid coating thereon, and
b. curing the liquid coating to form the anti-dust coating, wherein the anti-dust coating has a pencil hardness greater than H.
12. The method of claim 11 , wherein the substrate is an optically clear silicone substrate which is a silicone-based moldable LED encapsulant or a secondary optical article.
13. The method of claim 12 , wherein the anti-dust coating has a higher hardness than a hardness of the optically clear silicone substrate.
14. A method of forming a cured silicone anti-dust coating composition comprising:
(a) mixing a silicone resin having the general formula:
((CH 3 ) 3 SiO 1/2 ) x [(RSiO 3/2 ) a (RR 1 SiO 2/2 ) b (RR 1 R 2 SiO 1/2 ) c ] y (SiO 4/2 ) z
wherein each R is an epoxy group, R 1 and R 2 are each independently an alkyl group or an aryl group, x, y, z>0, x+y+z=1, a+b+c=y, 0≤a≤y, 0≤b≤y, and 0≤c≤y, a+b>0, and a+b≤y;
with a cationic photoinitiator to form a UV-curable silicone composition; and
(b) applying the UV-curable silicone composition onto a substrate to form a liquid coating thereon; and
(c) curing the liquid coating by ultraviolet radiation to form the cured silicone anti-dust coating composition.
15. The cured silicone anti-dust coating composition formed using the method of claim 14 .