SILICONE COMPOSITION, DISTRIBUTED COMPOSITION OF CURABLE SILICONE COMPOSITION AND MANUFACTURING METHOD OF CURED PRODUCT THEREOF AND CURED PRODUCT TO BE OBTAINED, AND LIGHT TRANSMITTANCE ADJUSTMENT METHOD
To provide a silicone composition whose light transmittance after storage is a constant value or more at the temperature of 5°C or lower, and causes no white turbidness, or a distributed composition of a curable silicone composition, and a manufacturing method of obtaining a highly transparent cured...
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Zusammenfassung: | To provide a silicone composition whose light transmittance after storage is a constant value or more at the temperature of 5°C or lower, and causes no white turbidness, or a distributed composition of a curable silicone composition, and a manufacturing method of obtaining a highly transparent cured product.SOLUTION: A silicone composition containing no fine powdery silica contains: (A) a mixture of (A-1) organopolysiloxane which has viscosity at 25°C of a predetermined upper limit value or less, and has alkenyl group, and (A-2) linear organopolysiloxane having alkenyl group in which the viscosity at 25°C is larger than a predetermined upper limit value of the (A-1) component, and the content of OH group binding to silicon atoms is 0.5 to 250 mass ppm; (B) silicone resin having alkenyl group; and (C) organohydrogensiloxane, where the silicone composition contains a constant amount or more of component (A-2) for silicone resin of component (B), and light transmittance after storage at a predetermined temperature or less is a predetermined value or more in a predetermined wavelength region.SELECTED DRAWING: Figure 3
【課題】5℃以下の温度で保管後の光透過率が一定値以上であり、白濁しない、シリコーン組成物、あるいは、硬化性シリコーン組成物の分配組成物と、高透明な硬化物を得る製造方法を提供する。【解決手段】(A)(A-1)25℃における粘度が所定上限値以下で、アルケニル基を有するオルガノポリシロキサンと、(A-2)25℃における粘度が、前記(A-1)成分の所定上限値より大きく、ケイ素原子に結合するOH基の含有量が0.5~250質量ppmである、アルケニル基を有する直鎖状オルガノポリシロキサンとの混合物と、(B)アルケニル基を有するシリコーンレジンと、(C)オルガノハイドロジェンシロキサン、を含む、微粉末シリカを含まないシリコーン組成物であって、(B)成分のシリコーンレジンに対して一定量以上の(A-2)成分を含み、所定温度以下で保管後の光透過率が、所定波長領域で所定数値以上である、シリコーン組成物。【選択図】図3 |
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