Packaging material composition

Abstract

The invention provides a packaging material composition, which comprises (a) 20 to 60wt% non-siloxane epoxy resin; (b) 5 to 50wt% siloxane epoxy resin containing aromatic siloxane 1 to 45wt%; and (c) 27 to 45wt% anhydride hardener. Additionally, the invention also provides another packaging material composition, which contains (a) 30 to 50wt% non-siloxane epoxy resin; (b) 5 to 50wt% alicyclic siloxane anhydride hardener; and (c) 27 to 45wt% anhydride hardener. The packaging material composition of the invention can be used for the transparent package material of a solid light emitting device, achieving the effect of long-time resistance to yellowing at high temperature.

Description

technical field [0001] The invention relates to an encapsulation material composition, in particular to an anti-thermal yellowing encapsulation material composition, which can be used as a transparent encapsulation material for solid-state light-emitting devices. Background technique [0002] In recent years, light emitting diodes (LEDs for short) have been gradually used in display backlights, vehicle light sources, large display panels and general lighting sources, and the demand for high-brightness LEDs is increasing day by day. Since the packaging materials for light-emitting devices must have homogeneity and high optical transmittance, and must pass long-term high-temperature storage and storage tests, the packaging materials for high-brightness LEDs must overcome the thermal yellowing caused by the high operating temperature derived from high current and other issues, and the epoxy resin currently used in LED packaging materials has a serious problem of thermal yellowi...

AI Technical Summary

Problems solved by technology

Since the packaging materials for light-emitting devices must have homogeneity and high optical transmittance, and must pass long-term high-temperature storage and storage tests, the packaging materials for high-brightness LEDs must overcome the thermal yellowing caused by the high operating temperature derived from high current and other issues, and the epoxy resin currently used in LED packaging materials has a serious problem of thermal yellowing. In the long term thermal aging test (Long term thermal aging), the yellowing of the packaging material will cause a significant drop in short-wavelength light penetration , affect the light transmittance of the material and cause color shift, so the application of epoxy resin has great limitations in the environment of high power and high operating temperature

[0003] The anti-yellowing method of traditional transparent packaging materials such as epoxy resin is to add antioxidants, which function to remove peroxide radicals in the oxidation process to terminate the chain reaction, or decompose hydroperoxides in the oxidation process to slow down high Molecular cracking speed, but LEDs have long-term use requirements. It is found in experiments that antioxidants alone are not enough to solve the problem of high-temperature and long-term thermal yellowing resistance of LED packaging materials, and are suitable for the use of antioxidants in LED transparent packaging products. There are few types of selectivity, and some types of antioxidants are highly volatile, and migration is prone to occur in materials

[0004] In addition to antioxidants, US Patent Nos. 6,632,592B2 and 2005 / 0282976A1 also mention silicone epoxy as a packaging material, but the content of the silicone epoxy resin used is very high (high 40% by weight), because the material of organosilicon epoxy resin is expensive, it is a bottleneck in practical application and cost; The glass transition temperature (Tg) is not high, and the protection of LED devices is insufficient, so it is not conducive to the packaging of high-brightness LEDs

[0005] In addition, in U.S. Patent 6,507,049B1, it is proposed to use boroxine (boroxine) as a catalyst to replace the anhydride hardener in the general packaging material formulation, which can effectively reduce the yellowing of the material after hardening due to the anhydride hardener, and reduce yellowing. Variable coefficient and absorbance in the low-wavelength band of visible light (400-530nm), but the curing conditions of the packaging material containing this catalyst must be precured at 25°C for 16 hours. This curing time is too long, which is not conducive to mass production. , it is difficult to apply

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