Curable particulate silicone composition, optically reflective material comprising curable particulate silicone composition, and production method for optically reflective material comprising curable particulate silicone composition

A silicone, curable technology, used in semiconductor/solid-state device manufacturing, optical components, other household appliances, etc., which can solve the problem of reduced linear expansion coefficient, handling workability, insufficient curing characteristics and gap filling, flexibility and Insufficient strength and toughness, etc., to achieve the effects of excellent flexibility and toughness, excellent handling workability, and excellent curing characteristics

Inactive Publication Date: 2019-06-04
DOW CORNING TORAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these liquid or slurry curable silicone compositions are not sufficient in handling, curing properties, and gap filling properties, and the cured product has insufficient flexibility and toughness at high temperatures from room temperature to about 150°C. Insufficient, especially due to insufficient flexibility of the cured product, warping or breakage may sometimes occur
[0005] On the other hand, in Patent Document 5 and Patent Document 6, a hot-melt curable composition using a mixed filler containing coarse particles is disclosed, but the storage elastic modulus of the cured product at room temperature is extremely high (for example, In Patent Document 5, it is 5000 MPa or more), and the flexibility is insufficient, so it is difficult to apply to applications subject to deformation or bending at room temperature
In addition, since the reduction of the coefficient of linear expansion due to the high filling of the filler suppresses warpage after integral molding with the lead frame, it is not possible to add a large amount of white pigment
Therefore, in these inventions, there is a problem that high reflectance in thin films cannot be achieved

Method used

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  • Curable particulate silicone composition, optically reflective material comprising curable particulate silicone composition, and production method for optically reflective material comprising curable particulate silicone composition

Examples

Experimental program
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Effect test

Embodiment

[0234] Next, the curable granular silicone composition of the present invention and its manufacturing method will be described in detail through examples and comparative examples. In addition, in the formula, Me, Ph, and Vi represent a methyl group, a phenyl group, and a vinyl group, respectively. In addition, for the curable silicone composition of each Example and Comparative Example, the softening point, melt viscosity, moldability, warpage of the molded product, storage elastic modulus and total light reflectance of the cured product were measured as follows, and the results were As shown in Table 1.

[0235] [Softening point of hot-melt silicone]

[0236] The heat-fusible silicone was placed on a hot plate set at 25° C. to 100° C., and the temperature at which it became liquefied was used as the softening point while checking the state with a scraper.

[0237] [Softening point of curable granular silicone composition]

[0238] The curable granular silicone composit...

reference example 1

[0248] When put into a 1L flask at 25°C, it is a white solid, with an average unit formula:

[0249] (PHSiO 3 / 2 ) 0.80 (Me 2 ViSiO 1 / 2 ) 0.20

[0250] 55 mass %-toluene solution 270.5 g of the represented resinous organopolysiloxane, with the formula:

[0251] HMe 2 SiO(Ph 2 SiO)SiMe 2 h

[0252]21.3 g (with respect to the resin 1 mole of vinyl groups in organopolysiloxane, 0.5 moles of silicon atoms bonded to hydrogen atoms in this component), and 1,3-divinyltetramethyldisiloxane complex of platinum 0.034 g of 1,3-diethylenetetramethyldisiloxane solution (content of platinum metal = about 4000 ppm) (the amount of platinum metal is 10 ppm by mass relative to this liquid mixture) was uniformly stirred at room temperature. Then, the temperature in the flask was raised to 100°C using an oil bath, and stirred for 2 hours under reflux of toluene to prepare a resinous organosiloxane derived from the above-mentioned resinous organopolysiloxane and a resinous organopolysilo...

reference example 2

[0254] Into a 500 mL four-neck round bottom flask equipped with a Dean-Stark apparatus connected to a thermometer, a Teflon (registered trademark) stirring blade, and a water-cooled condenser, and filled with toluene in advance, the average Unit type:

[0255] (PhSiO 3 / 2 ) n

[0256] (wherein, n is the positive number that the weight average molecular weight of this organopolysiloxane is 1500)

[0257] 318.6 g of the 56.5% by mass-toluene solution of the indicated organopolysiloxane. Heating at the reflux temperature of toluene for 30 minutes removed 0.54 g of water. Next, cool to 108°C, add 4.24 g (0.0187 mol) of a mixture of methyltriacetylsilane / ethyltriacetylsilane with a molar ratio of 1:1 and silanol-terminated methylbenzene at both ends of the molecular chain. 220 g (1.614 mol) of phenylpolysiloxane (polymerization degree = 181) was reacted at room temperature for 1 hour with 224.24 g of a methylphenylpolysiloxane mixture. The reaction mixture was heated under nit...

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Abstract

Provided is a curable particulate silicone composition that is hot-meltable, that has excellent handling workability and curing properties, and that gives cured objects that have high optical reflectance for the visible wavelength range and excellent flexibility and resilience from room temperature to high temperatures of about 150DEG C. Also provided is a use for the curable particulate siliconecomposition. A curable particulate silicone composition that is characterized by containing: (A) hot-meltable silicone fine particles that have a softening point of 30DEG C or higher and that have a hydrosilylatable group and / or a radical-reactive group; (B) an inorganic filler that does not substantially include coarse particles that have an average particle diameter of 5 mum or higher; and (C) acuring agent. The curable particulate silicone composition is also characterized in that, when cured, the curable particulate silicone composition gives a cured object that has a storage modulus of 2000 MPa or lower at 25DEG C and of 100 MPa or lower at 50DEG C and that, at a thickness of 100 mum, has an optical reflectance of 90% or higher at wavelengths of 450 nm and, ideally, 700 nm. A use forthe curable particulate silicone composition.

Description

technical field [0001] The present invention relates to a curable granular silicone composition and particles molded from the curable granular silicone composition. Further, the present invention relates to a cured product using the curable granular silicone composition or particles, or a sheet, a molding method of the cured product, a light reflective material composed of the cured product, and a semiconductor device including the cured product. Background technique [0002] The curable silicone composition is cured to form a cured product having excellent heat resistance, cold resistance, electrical insulation, weather resistance, hydrophobicity, and transparency, and thus is widely used in industrial fields. The cured product of such a curable silicone composition is less likely to be discolored than other organic materials and has less decrease in physical properties, so it is also suitable as an optical material. [0003] In Patent Document 1 and Patent Document 2, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08J5/00C08K3/013H01L21/56H01L33/60
CPCC08K3/00H01L21/56H01L33/60C08L83/04C08G77/12C08G77/20C08K3/22C08G77/70C08K3/011C08K3/013C09D183/04C08J2383/04C08J3/244C08K5/56C08L83/00C08J3/24C08K2201/005C08J5/00B29C45/0001B29C45/0013B29C2045/0091B29K2083/00B29K2509/02B29K2995/003B29L2011/0083C08G77/80C08K2003/2241C08L2203/20C08L2205/025C08L2205/18H01L33/501
Inventor 山崎亮介
Owner DOW CORNING TORAY CO LTD
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