UV-curable silicone compositions and anti-dust coating compositions containing same

Patent metadata

Field	Value
Publication number	US-9976041-B2
Application number	US-201415037063-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Dec 23, 2013
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

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.

First claim

The invention claimed is:

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 .

Assignees

• Dow Corning
• Dow Silicones Corp

Inventors

• Fu Peng-Fei
• Moyer Eric
• Rong Wei

Classifications

• C08G2150/00

  Compositions for coatings · CPC title

• H01L33/56

  Electricity · mapped topic

• C08G77/14 Primary

  containing silicon bound to oxygen-containing groups · CPC title

• C09D5/1675 Primary

  Polyorganosiloxane-containing compositions · CPC title

• C09D183/06

  containing silicon bound to oxygen-containing groups (C09D183/12 takes precedence) · CPC title