Curable silicone resin composition, cured product thereof, and opaque silicone adhesive sheet formed from the composition
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A resin composition, silicone technology, applied in nonlinear optics, optics, adhesives, etc., can solve problems such as poor practicability, increased cost, and reduced internal curability, and achieves difficult separation and sedimentation, prevents wrong operation, and has good shading properties. Effect
Active Publication Date: 2010-03-17
SHIN ETSU CHEM IND CO LTD
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As such an electrode protective agent, solvent-based or dealcohol-type resins are usually used, but these resins take a long time to cure, and their cured products have the disadvantage of strong surface stickiness.
In order to overcome this disadvantage, electrode protectors using ultraviolet curable resins with fast curing speed and high reliability have also been developed, but due to the addition of light-shielding pigments, the internal curing properties are reduced, and the practicability is poor.
Therefore, a method of covering the liquid crystal electrode with an ultraviolet curable resin and curing it with a light-shielding tape has been developed. However, because the process is long and complicated, the productivity is likely to decrease, and there is a problem of increased cost. question
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[0112] Hereinafter, the present invention will be specifically described by giving synthesis examples, examples, and comparative examples, but the present invention is not limited by the following examples. In addition, the weight average molecular weight in the following example is the polystyrene conversion value measured by gel permeation chromatography (GPC).
Synthetic example 1
[0114] -Organopolysiloxane resin containing vinyl group (A1)-
[0117] MeViSiCl 2 : 84.6 g (9.7 mol %) was dissolved in toluene solvent, added dropwise to water, co-hydrolyzed, washed with water, neutralized by alkaline washing, dehydrated and then desolventized to synthesize vinyl-containing resin (A1) . This resin is a solid having a weight average molecular weight of 62,000 and a melting point of 60°C. The resin had a vinyl content of 0.05 mol / 100 g.
Synthetic example 2
[0119] -Organopolysiloxane resin (B1) containing hydrosilyl group (Hiderosilyl)-
[0122] MeHSiCl 2 : 69g (9.7 mol %) dissolved in toluene solvent, added dropwise to water, co-hydrolyzed (co-hydrolyzed), then washed with water, neutralized by alkali washing, dehydrated and desolventized, and synthesized containing hydrosilane base resin (B1). This resin is a solid having a weight average molecular weight of 58,000 and a melting point of 58°C. The silyl group content of this resin was 0.05 mol / 100 g.
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Abstract
Disclosed are a curable silicone resin composition, a cured product thereof, and the opaque silicone adhesive sheet formed from the conposition. The curable silicone resin composition is solid at roomtemperature, the composition including: (A) an organopolysiloxane having a resin structure consisting of specific siloxane units, (B) an organohydrogenpolysiloxane having a resin structure consistingof specific siloxane units, (C) a platinum group metal-based catalyst, (D) either one or both of an opaque pigment and an opaque dye, and (E) a reaction retarder, in which a layer of thickness 100 [mu]m formed from a cured product of the composition exhibits a light transmittance of not more than 5% across the entire visible light range. The composition is solid at room temperature and thereforeeasy to handle. Further, the composition is useful for producing an opaque silicone adhesive sheet. A cured product obtained by curing the composition can be used to protect a liquid crystal electrodeand shield the electrode from light, thereby preventing malfunction of the driver IC, and also exhibits excellent mechanical properties and flexibility, and displays minimal surface tack.
Description
technical field [0001] The present invention relates to a curable silicone resin composition, its cured product, and a light-shielding silicone adhesive sheet made of the composition. Background technique [0002] Generally, in a liquid crystal display (hereinafter, sometimes simply referred to as LCD), a driver IC is mounted on an electrode on which a chip on glass (chipon glass) is mounted. This driver IC is known to malfunction when exposed to strong light. Especially for mobile phones with cameras, the driver IC is prone to misoperation due to strong light such as camera flashes. Conventionally, in order to protect LCD electrodes (hereinafter, sometimes referred to as liquid crystal electrodes) and light-shielding, and to prevent driver IC malfunctions, electrode protective agents added with light-shielding pigments have been developed. As such an electrode protecting agent, solvent-based or dealcohol-type resins are generally used, but these resins take a long time to...
Claims
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