A method for making an optical assembly comprising depositing a solid silicone-containing hot melt composition in powder form and forming an encapsulant thereof
A technology of optical components and organic silicon, which is applied in the direction of optical components, optical components, electric solid devices, etc., and can solve problems such as degradation of optical devices
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[0184] Containing at least 60 mole % of [R 2 SiO 3 / 2 ] Organosiloxane resins having siloxy units and methods for their preparation are known in the art. They are usually prepared by hydrolyzing organosilanes with three hydrolyzable groups, such as halogen or alkoxy groups, on the silicon atom in an organic solvent. Representative examples for preparing silsesquioxane resins can be found in US Patent No. 5,075,103. Additionally, many organosiloxane resins are commercially available and sold as solids (flakes or powders) or dissolved in organic solvents. Suitable non-limiting commercially available organosiloxane resins that may be used as component b) include: Dow 217 flake resin, 233 flake, 220 flake, 249 flake, 255 flake, Z-6018 flake (Dow Corning Corporation, Midland MI, USA).
[0185] Those skilled in the art also recognize that containing such high amounts of [R 2SiO 3 / 2 ]Organosiloxane resins with siloxy units and silanol content can also retain water molecules, es...
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[0212] A series of examples including solid compositions and organosiloxane block copolymers were formed according to the invention. A series of comparative examples was also formed, but not according to the invention. After forming, the examples and comparative examples were formed into sheets, and the sheets were then further evaluated.
example 1
[0214] A 500 mL 4-necked round bottom flask was charged with toluene (65.0 g) and phenyl-T resin (FW = 136.6 g / mol Si; 35.0 g, 0.256 mol Si). The flask was equipped with a thermometer, a Teflon stirring paddle and a DeanStark apparatus pre-filled with toluene and attached to a water-cooled condenser. A nitrogen blanket was then applied. The flask was heated at reflux for 30 minutes using an oil bath. Subsequently, the flask was cooled to about 108°C (pot temperature).
[0215]A solution of toluene (35.0 g) and silanol-terminated PhMe siloxane (140 dp, FW = 136.3 g / molSi, 1.24 mol% SiOH, 65.0 g, 0.477 mol Si) was then prepared and incubated under nitrogen in a glove box (the same day ) capped the siloxane with 50 / 50 MTA / ETA (average FW = 231.2 g / mol Si, 1.44 g, 0.00623 mol) by adding 50 / 50 MTA / ETA to the siloxane and mixing at room temperature for 2 hours. The blocked siloxane was then added to the phenyl-T resin / toluene solution at 108°C and refluxed for about 2 hours.
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