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Addition curing type organosilicon composition, cured product thereof, sheet and optical element

An addition curing type, optical component technology, applied in the direction of optical components, optics, instruments, etc., can solve the problems of easy cracking, etc., and achieve the effect of sufficient bending resistance, sufficient hardness, and excellent bending resistance

Active Publication Date: 2021-03-12
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]However, although these high-hardness and high-transparency silicone resins have excellent scratch resistance and crack resistance, they are When the thin sheet is bent, there is a disadvantage that it is easy to break

Method used

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  • Addition curing type organosilicon composition, cured product thereof, sheet and optical element
  • Addition curing type organosilicon composition, cured product thereof, sheet and optical element
  • Addition curing type organosilicon composition, cured product thereof, sheet and optical element

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0078] As an example of the production method of (B) component,

[0079] By [1] subjecting an organopolysiloxane having an alkenyl group bonded to a silicon atom to a hydrosilylation reaction with dimethylchlorosilane,

[0080] [2] It is obtained by reacting the composition obtained in [1] with a hydroxyalkyl (meth)acrylate such as 2-hydroxyethyl acrylate in the presence of triethylamine.

[0081] As a preferable example of (B) component, the organopolysiloxane represented by following formula (3) is mentioned.

[0082]

[0083] In the formula, p is a positive number of 1 to 1,000, q is a positive number of 1 to 100, r is 2 or 3, and the arrangement of the siloxane units enclosed in parentheses may be arbitrary.

[0084] Among them, q / (p+q) is preferably 0.25-1, more preferably 0.3-1.

[0085] As a specific example of (B) component, the component represented by the following formula is mentioned.

[0086]

[0087] In the formula, the arrangement of the siloxane units ...

Embodiment 1～4 and comparative example 1～3

[0164] The above-mentioned (A)-(E) components were mixed in the compounding quantity (parts by mass) shown in Table 1, and the addition-curable silicone composition was prepared. In addition, the value of [Si-H] / [aliphatic unsaturated hydrocarbon group] (hereinafter also referred to as "SiH ratio") is the number of SiH groups in (C) component relative to (A) component and (B) component The number of aliphatic unsaturated hydrocarbon groups in , that is, the ratio of the total number of alkenyl groups and (meth)acrylic groups is calculated.

[0165]

[0166] The addition-curable silicone compositions obtained in Examples 1-4 and Comparative Examples 1-3 were heat-cured at 150°C for 1 hour using a metal mold to produce colorless and transparent sheets with a thickness of 2 mm and 0.2 mm. . The following evaluations were performed on the obtained sheet, and the results are shown in Table 2.

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Abstract

The present invention provides an addition curable silicone composition that provides a cured product having excellent bending resistance. The addition curable silicone composition contains: (A) an organopolysiloxane represented by the following average composition formula (1), R1n(C6H5)mSiO(4-n-m) / 2 (1) formula, wherein, R1 is a monovalent hydrocarbon group, an alkoxy group or a hydroxyl group, and 0.1-80 mol% of all R1 is an alkenyl group; (B) a linear organopolysiloxane having at least two (meth)acrylic groups and at least one phenyl group bonded to a silicon atom in one molecule; (C) organohydrogen polysiloxane containing at least 2 hydrogen atoms bonded to silicon atoms in one molecule represented by the following average composition formula (2), R2aHbSiO(4-a-b) / 2. In the formula, R2is a monovalent hydrocarbon group other than the aliphatic unsaturated hydrocarbon group; and (D) a hydrosilylation reaction-containing catalyst.

Description

technical field [0001] The present invention relates to an addition-curable silicone composition, its cured product, a sheet using the cured product, and an optical element. Background technique [0002] Silicone resins are known as resins excellent in heat and cold resistance, electrical insulation, weather resistance, water resistance, and transparency, and are used in various fields such as electrical and electronic equipment, OA equipment, automobiles, precision equipment, and building materials. middle. [0003] In recent years, especially in the field of LEDs, organic materials have been exposed to high temperatures and high luminosity for a long period of time due to the miniaturization of optical components and the increase in brightness of light sources. Transparent organic resins and silicone resins are not only excellent in heat resistance and transparency, but also less prone to discoloration and physical deterioration. They have been confirmed to be superior to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08K5/14C08K5/5419C08J5/18G02B1/04
CPCC08L83/04C08J5/18G02B1/04C08L2205/025C08L2205/03C08J2383/07C08J2483/05C08K5/5419C08K5/14
Inventor 山川直树田中将太
Owner SHIN ETSU CHEM IND CO LTD