Dispensable Getter Paste for Moisture and VOC Control
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Solution Overview
Problem
Existing getter materials for sealed electronic and optoelectronic devices face challenges in simultaneously controlling moisture and organic gases, as they often experience reduced effectiveness when competing with each other, leading to decreased performance.
Innovation Solution
A dispersible getter composition combining Faujasite (FAU) zeolites or a mixture of FAU and Linde Type A (LTA) zeolites with polyphenylene oxide (PPO) or Poly(2,6-diphenyl-p-phenylene oxide) (PPPO) in specific ratios, which maintains water adsorption capacity while reducing the negative impact of VOCs, is used in conjunction with an epoxy or phenolic resin to form a dispensable paste for effective moisture and VOC removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If getter materials are placed inside sealed devices, then contaminant removal is improved, but device complexity increases
Solution Approach 1:
The patent merges the getter material with the sealing structure by integrating the composite getter particles into the sealant composition. The sealant contains 1-50 wt% of the composite getter particles (zeolite and activated carbon combination), allowing the sealing function and contaminant absorption function to be combined in a single component. This eliminates the need for separate getter chambers or additional structural elements, thereby maintaining device simplicity while ensuring effective contaminant removal.
Solution Approach 2:
The sealant composition serves multiple functions simultaneously: it provides hermetic sealing to prevent contaminant ingress, acts as an adhesive to bond device components, and functions as a getter material to absorb water and VOCs. This multi-functionality is achieved by incorporating the composite getter particles (zeolite + activated carbon) directly into the sealant matrix, allowing a single material to fulfill multiple protective roles without increasing device complexity.
2Reliability
If desiccant fillers are used as moisture scavenging features, then moisture barrier performance is improved, but dispensability deteriorates
Solution Approach 1:
The patent optimizes the particle size parameters of the desiccant fillers to improve dispensability while maintaining moisture barrier performance. The zeolite particles have a size range of 0.1-10 μm and the activated carbon particles have a size range of 0.1-5 μm. These carefully controlled particle size parameters ensure that the composite getter material can be evenly dispersed in the sealant matrix and properly dispensed through standard dispensing equipment, while still providing effective moisture and VOC adsorption capabilities.
Solution Approach 2:
The composite material combining zeolite and activated carbon particles in optimized ratios and size distributions provides both superior adsorption performance and improved dispensability. The combination of different particle types with complementary size ranges allows for better flow characteristics and easier dispensing compared to using single large-particle desiccants, while the high surface area of both components ensures effective contaminant removal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition effectively maintains water adsorption capacity despite the presence of VOCs and vice versa, with improved dispensability and adsorption performance, allowing for efficient removal of both moisture and organic compounds from electronic devices.
Implementation Method 1
the placing of an absorbent or adsorbent getter material inside the sealed device in order to remove the contaminants into its internal sealed volume
Implementation Method 2
powdered zeolites (such as 4A and 3A molecular sieves)
Implementation Method 3
the desiccant effect is reached by using a variety of sorbent media such as activated carbon
Implementation Method 4
a variety of sorbent media such as activated carbon, alumina and other metal oxides, zeolites
Data Source
AI summary
Getter composition to be used for controlling the amount of moisture and organic gases in sealed electronic or optoelectronic devices, said composition comprising a blend of first getter and second getter powders in a weight ratio comprised between 0.1 and 5.0, wherein the first getter is polyphenylene oxide (PPO) or Poly(2,6-diphenyl-p-phenylene oxide) (PPPO) and the second getter is a Faujasite (FAU) zeolite or a mixture of a Faujasite (FAU) zeolite and a Linde Type A (LTA) zeolite with a ratio comprised between 0.1 and 5.0. The invention also relates to a dispensable paste comprising a resin and the getter composition.