# US 8,772,430 B2 · Silicone resin, sealing material, and optical semiconductor device

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- Number: US 8,772,430 B2
- Document ID: US8772430B2
- Status: Granted
- Kind: B2
- Application number: 13/273,664
- Filed: 2011-10-14
- Published: 2012-05-10
- Granted: 2014-07-08
- Earliest claimed: 2010-11-05
- Assignees: Nitto Denko Corporation
- Applicants: Haruka Fujii; Hiroyuki Katayama
- Inventors: Haruka Fujii; Hiroyuki Katayama
- Web page: https://patentgrep.com/patent/US8772430B2

## CPC

- G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence)
- C08L 83/04: Polysiloxanes
- H10W 74/476: {Organic materials comprising silicon}
- C08G 77/045: {containing less than 25 silicon atoms}
- C08G 77/12: containing silicon bound to hydrogen
- C08G 77/20: containing silicon bound to unsaturated aliphatic groups
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS

## Abstract

A silicone resin is obtained by allowing a cage octasilsesquioxane having a group represented by formula (1) below, to react with an alkenyl group-containing polysiloxane containing an alkenyl group having a molarity smaller than the molarity of the hydrosilyl group of the cage octasilsesquioxane in the presence of a hydrosilylation catalyst: (where R1 represents a monovalent hydrocarbon group, R2 represents hydrogen or a monovalent hydrocarbon group, and the molar ratio of monovalent hydrocarbon group: hydrogen in R2 in the cage octasilsesquioxane as a whole is, as an average value, in a range of 6.5:1.5 to 5.5:2.5).

## Claims

### Claim 1

A silicone resin obtained by allowing a cage octasilsesquioxane having a group represented by formula (1) below, to react with
an alkenyl group-containing polysiloxane containing an alkenyl group in the presence of a hydrosilylation catalyst such that a hydrosilyl group of the cage octasilsesquioxane remains in a ratio at which a molar ratio of an alkenyl group of the alkenyl group-containing polysiloxane to the hydrosilyl group of the cage octasilsesquioxane is below 1:
(where R1 represents a monovalent hydrocarbon group, R2 represents hydrogen or a monovalent hydrocarbon group, and the molar ratio of monovalent hydrocarbon group: hydrogen in R2 in the cage octasilsesquioxane as a whole is, as an average value, in a range of 6.5:1.5 to 5.5:2.5).

### Claim 2 (depends on 1)

The silicone resin according to claim 1, wherein the cage octasilsesquioxane is represented by formula (2) below:
(where R1 and R2 are as defined in claim 1, and the molar ratio of monovalent hydrocarbon group: hydrogen in R2 is as defined in claim 1).

### Claim 3 (depends on 1)

The silicone resin according to claim 1, wherein the alkenyl group-containing polysiloxane is represented by formula (3) below:
(where R3 represents a monovalent hydrocarbon group, R4 represents an alkenyl group, and “a” represents an integer of 1 or more).

### Claim 4 (depends on 1)

A sealing material comprising the silicone resin according to claim 1, for use in sealing in an optical semiconductor element.

### Claim 5

An optical semiconductor device including
an optical semiconductor element, and
a sealing material comprising a silicone resin, the sealing material sealing in the optical semiconductor element
wherein the silicone resin is obtained by allowing
a cage octasilsesquioxane having a group represented by formula (1) below to reach with
an alkenyl group-containing polysiloxane containing an alkenyl group having a molarity smaller than the molarity of a hydrosilyl group of the cage octasilsesquioxane
in the presence of a hydrosilylation catalyst,
such that a hydrosilyl group of the cage octasilsesquioxane remains in a ratio at which a molar ratio of an alkenyl group of the alkenyl group-containing polysiloxane to the hydrosilyl group of the cage octasilsesquioxane is below 1:
(where R1 represents a monovalent hydrocarbon group, R2 represents hydrogen or a monovalent hydrocarbon group, and the molar ratio of monovalent hydrocarbon group: hydrogen in R2 in the cage octasilsesquioxane as a whole is, as an average value, in a range of 6.5:1.5 to 5.5:2.5).