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Addition curing type silicone composition and optical element

A silicone composition, addition curing technology, applied in the field of addition curing silicone composition and optical elements, can solve the problem that the transparency, refractive index and elasticity cannot be fully satisfactory, and the performance of optical elements cannot be solved. Satisfactory enough, difficulty in polysiloxane synthesis, etc., to achieve excellent light extraction efficiency, good rubber properties and strength properties, and good strength properties

Inactive Publication Date: 2013-01-02
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the polysiloxane is relatively difficult to synthesize, and the polysiloxane is considered to be able to obtain a cured product with a refractive index of 1.54 or more.
In addition, polysiloxane obtained by branching polysiloxane and introducing phenyl groups can have a cured product with a refractive index of about 1.53 to 1.54, but the obtained cured product is in the form of a relatively hard resin, and not elastic
Therefore, a composition is also proposed, which is formed by combining a branched chain organopolysiloxane and a linear organopolysiloxane (organopolysiloxane), but the transparency, refractive index, elasticity, etc. of the composition are not Unsatisfactory enough (Patent Document 1 to Patent Document 7)
[0005] Therefore, in Patent Document 8, an addition-curable silicone composition capable of obtaining high transparency and high refractive index and good strength characteristics and a sealing material for an optical element are proposed. The cured product of the optical element sealing material is composed of the composition, but the performance of the obtained optical element is not sufficiently satisfactory
[0006] And, previously, especially at 25°C, the light transmittance at a wavelength of 400nm was poor

Method used

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  • Addition curing type silicone composition and optical element
  • Addition curing type silicone composition and optical element
  • Addition curing type silicone composition and optical element

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Embodiment

[0109] Hereinafter, the present invention will be specifically described by showing production examples, examples, and comparative examples, but the present invention is not limited to the following examples.

[0110] In addition, in the following examples, the viscosity means the value measured at 23 degreeC using a rotational viscometer.

[0111] The refractive index refers to the refractive index at 589 nm measured at 25°C using a digital refractometer RX-5000 manufactured by Japan Atago Co., Ltd. (ATAGO CO., LTD.). The hardness, elongation at break and tensile strength are Measured according to JIS-K6249.

[0112] The light transmittance is the transmittance to light having a wavelength of 400 nm measured at 25° C. using a spectrophotometer about a cured product obtained by forming the composition into a thin plate with a thickness of 2 mm and curing it.

[0113] In addition, in the following examples, the symbols representing the average composition of the linear organop...

preparation example 1

[0124] [Preparation Example 1] Preparation of platinum catalyst (catalyst A)

[0125] The reaction product of chloroplatinic acid and sym-tetramethyldivinyldisiloxane was diluted with toluene so that the platinum content was 1.0% by mass, thereby preparing the platinum catalyst (catalyst A) used in the present example and the comparative example. .

preparation example 2

[0126] [Preparation Example 2] Synthesized from D Vi / T F1 Organopolysiloxane with branched structure represented by =2 / 8

[0127] 160 g of hexafluoro-m-xylene, 290 g of water and 323 g of concentrated hydrochloric acid were added to a 2 L flask, and the temperature was raised to 70° C. while stirring. After the temperature was raised, 175 g (0.8 mol) of trifluoropropyltrimethoxysilane, 26 g (0.2 mol) of methylvinyldimethoxysilane, and 40 g of hexafluorom-xylene were added dropwise. After dripping, it aged at 75 degreeC for 2 hours. After aging, the hydrochloric acid water in the upper layer was removed, and then the organic layer was washed with water, and the washing was repeated until the washed water became neutral. 0.1 g of potassium hydroxide was added to the washed organic layer, the temperature was raised to 120° C., and a dehydration condensation reaction was performed. After the completion of the reaction, 1 g of potassium acetate and 0.23 g of trimethylchlorosil...

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Abstract

The present invention provides an addition curing type silicone composition capable of obtaining a cured substance having a very high transparency, a good strength characteristic, and excellent optical element properties such as light extraction efficiency and so on. The present invention also provides an optical element which is sealed by using the cured substance of the composition. The addition curing type silicone composition of the present invention at least comprises: (A) 100 parts by mass of linear chain shaped organopolysiloxane; (B) 1-100 parts by mass of organopolysiloxane having a branched chain structure, wherein the branched chain structure contains a siloxane unit represented by SiO4 / 2 and / or RSiO3 / 2; (C) organosilicon compound of which one molecule has more than two hydrogen atoms bonded to a silicon atom, wherein a molar ratio between a total aliphatic series unsaturated group of the (A) composition and the (B) composition and a SiH group of the (C) composition is 0.2 <= SiH group / aliphatic series unsaturated group <= 5.0; and (D) effective dose of platinum group metal catalyst.

Description

technical field [0001] The present invention relates to an addition-curable silicone composition and an optical element, in particular to an addition-curable silicone composition and an optical element, the addition-curable silicone composition can obtain rubber properties and strength properties A good cured product having a low refractive index, the optical element is sealed with the cured product of the composition. Background technique [0002] The addition-curable silicone composition includes an organopolysiloxane containing an aliphatic unsaturated group such as an alkenyl group, and can be cured by a hydrosilylation reaction to obtain a cured product. The cured product obtained in this way is excellent in heat resistance, cold resistance and electrical insulation, and is transparent, so it is used as a sealing material for various optical applications. [0003] The organopolysiloxane composition used in optical applications and the sealing material for optical eleme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05G02B1/04
Inventor 岩田充弘小材利之茂木胜成
Owner SHIN ETSU CHEM IND CO LTD
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