Adhesive Composition Storage Stability via Preliminary Action
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Solution Overview
Problem
Existing adhesive compositions for optical applications face challenges in simultaneously achieving excellent water resistance, adhesive force, and storage stability while maintaining optical properties.
Innovation Solution
An adhesive composition comprising a polyvinyl alcohol binder, a crosslinking agent, and a compound of the formula HO—SO2—R, where R is an alkyl, haloalkyl, or haloalkylaryl group, is used, with the compound improving storage stability and crosslinking efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive compositions are used to achieve water resistance and adhesive force, then bonding performance is improved, but storage stability deteriorates due to premature crosslinking or degradation
Solution Approach 1:
The patent applies preliminary action by incorporating a crosslinking agent into the adhesive composition in advance, but designing it to remain dormant during storage and only activate when exposed to moisture from the polarizer or during the bonding process. This allows the adhesive to maintain stability during storage while ensuring crosslinking occurs at the appropriate time for optimal water resistance and adhesive force.
Solution Approach 2:
The patent employs beforehand cushioning by using specific stabilizers and controlling the chemical environment to prevent premature crosslinking or degradation of the adhesive during storage. This cushioning effect protects the adhesive composition from deteriorating before use, ensuring it remains stable until the bonding operation occurs.
2Reliability
If crosslinking agents are added to improve water resistance, then water resistance is improved, but storage stability worsens due to premature crosslinking reactions
Solution Approach 1:
The crosslinking agent is introduced into the adhesive composition in advance but designed to remain inactive during storage. The crosslinking reaction is triggered only when the adhesive contacts moisture from the polarizer or undergoes heating during the bonding process, ensuring water resistance is achieved without premature crosslinking that would compromise storage stability.
Solution Approach 2:
The patent utilizes parameter changes by controlling temperature, moisture exposure, and pH conditions to regulate when crosslinking occurs. During storage, parameters are maintained to prevent crosslinking, while during bonding, parameter changes (such as heating or moisture exposure) trigger the crosslinking reaction to achieve the desired water resistance.
3Strength
If high reactivity crosslinking agents are used to enhance adhesive force, then adhesive force is improved, but storage stability deteriorates due to increased risk of premature reaction
Solution Approach 1:
High reactivity crosslinking agents are incorporated into the adhesive composition in advance, but their reactivity is controlled through the chemical environment and physical conditions. The crosslinking reaction remains dormant during storage and activates only when exposed to moisture or heat during bonding, allowing high adhesive force to be achieved without premature reaction that would reduce storage stability.
Solution Approach 2:
The patent uses moisture from the polarizer or controlled heating as an intermediary trigger to initiate the crosslinking reaction. This intermediary mechanism allows high reactivity crosslinking agents to remain stable during storage while ensuring they activate at the appropriate time to achieve maximum adhesive force.
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 adhesive composition achieves enhanced water resistance, adhesive force, and storage stability, effectively addressing the limitations of previous compositions.
Implementation Method 1
a crosslinking agent and a compound of Formula 1 below: HO—SO2—R
Implementation Method 2
a polyvinyl alcohol binder... excellent transparency, water resistance, adhesiveness
Implementation Method 3
excellent transparency, water resistance, adhesiveness and storage stability
Data Source
AI summary
An adhesive composition includes a polyvinyl alcohol binder, a crosslinking agent and a compound of Formula 1 below,HO—SO2—R [Formula 1]wherein in Formula 1, R is an alkyl group, a haloalkyl group or a haloalkylaryl group. The adhesive composition may have excellent water resistance, adhesive force and other optical properties as well as greatly improved storage stability.