Acrylate Adhesive Antistatic Composition
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Solution Overview
Problem
Existing antistatic pressure-sensitive adhesive compositions for surface protecting films in the electronics industry face challenges with static electricity generation and staining issues, particularly when peeling from optical members like polarizing plates, as previous solutions like low-molecular surfactants and polyether polyol compounds lead to bleeding and reduced adhesion reliability.
Innovation Solution
A pressure-sensitive adhesive composition comprising a (meth)acryl-based polymer with 5-100% acrylic acid alkylene oxide adduct, 0-95% (meth)acryl monomers with alkyl groups, and an alkali metal salt, where the acid value is 10 or lower, preventing electrification and staining by crosslinking the polymer and using lithium salts for enhanced antistatic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low-molecular surfactant is added to the pressure-sensitive adhesive to prevent static electrification, then antistatic property is improved, but the surfactant bleeds on the adhesive layer surface causing staining of the optical member and deterioration of optical properties
Solution Approach 1:
The patent changes the molecular weight parameter of the surfactant from low-molecular to high-molecular (polymer-type), which fundamentally alters the bleeding behavior. The high-molecular surfactant remains embedded in the adhesive matrix due to its size, preventing surface bleeding while maintaining antistatic functionality through charge transfer mechanisms.
Solution Approach 2:
The patent creates a composite system combining high-molecular surfactant with pressure-sensitive adhesive polymer matrix. This composite structure allows the surfactant to function as an antistatic agent while being physically constrained within the polymer network, preventing migration to the surface and subsequent staining of the optical member.
2Reliability
If an antistatic agent comprising polyether polyol compound and alkali metal salt is added to prevent bleeding, then adhesion reliability is improved, but the agent still bleeds over time or under high temperature conditions causing partial peeling
Solution Approach 1:
The patent changes the molecular weight parameter from low-molecular to high-molecular surfactant, which fundamentally alters the thermal stability and bleeding resistance. The high-molecular surfactant's larger size and stronger interactions with the polymer matrix prevent migration even under elevated temperature conditions, maintaining adhesion reliability.
Solution Approach 2:
The patent replaces the unstable low-molecular surfactant system with a stable high-molecular surfactant system that functions as a permanent antistatic agent within the adhesive matrix, eliminating the need for additional stabilizing additives and preventing long-term degradation.
3Ease of manufacture
If plastic materials are used for optical member, pressure-sensitive adhesive, and surface protecting film to achieve desired mechanical properties, then ease of manufacture is improved, but static electricity is generated upon friction or peeling
Solution Approach 1:
The patent incorporates the antistatic function directly into the pressure-sensitive adhesive composition itself, making the adhesive system self-sufficient for static control. The high-molecular surfactant within the adhesive provides continuous charge transfer capability during application and peeling operations, eliminating the need for separate antistatic treatments on individual plastic components.
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 prevents static electrification and reduces staining on optical members during peeling, maintaining strong adhesion and heat resistance, making it suitable for high-demand applications in the electronics industry.
Implementation Method 1
it has been found out that the aforementioned object can be attained by a pressure-sensitive adhesive composition shown below, which resulted in completion of the present invention... by coordination of an ether group in an acrylic acid alkylene oxide adduct with an alkali metal salt, bleeding of an alkali metal salt becomes difficult
Implementation Method 2
by coordination of an ether group in an acrylic acid alkylene oxide adduct with an alkali metal salt, bleeding of an alkali metal salt becomes difficult
Data Source
AI summary
An object of the present invention is to provide a pressure-sensitive adhesive composition which is excellent in antistatic property of a non-electrification-prevented adherend (a subject to be protected) upon peeling, and has reduced stainability in an adherend and is excellent in adhesion reliance, and electrification preventing pressure-sensitive adhesive sheets and surface protecting films using the same. There is provided a pressure-sensitive adhesive composition, which comprises a (meth)acryl-based polymer containing, as a monomer component, 5 to 100% by weight of a (meth)acrylic acid alkylene oxide adduct, 0 to 95% by weight of a (meth)acryl-based monomer having an alkyl group of a carbon number of 1 to 14 other than the adduct, and 0 to 95% by weight of other polymerizable monomer, and an alkali metal salt, wherein an acid value of the (meth)acryl-based polymer is 10 or lower.