Optical Laminate Antistatic Layer Conductive Polymer Composition
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Solution Overview
Problem
Existing optical laminates for image display devices face challenges in achieving high antistatic properties and scar resistance while maintaining surface quality, particularly due to issues with conductivity, transparency, and durability when using conductive materials like metal oxides or conductive polymers, and are prone to conductivity loss during saponification treatments.
Innovation Solution
The development of an optical laminate with an antistatic layer composed of a hydrophobilized conductive polymer composition containing a π-conjugated system conductive polymer and an anion group-containing polymer dopant, combined with inorganic or organic fine particles and an ionizing radiation curable compound, which enhances conductivity and durability while maintaining surface uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive polymer is added in a layer to be provided on the outermost surface of an optical laminate, then antistatic properties are improved, but curing of the binder is impaired and physical strengths are lowered
Solution Approach 1:
The patent changes the chemical structure parameters of the conductive polymer by introducing specific functional groups (carboxyl, hydroxyl, or amino groups) that can interact with the binder. This parameter change allows the conductive polymer to maintain compatibility with the binder system, enabling proper curing while preserving physical strength, thus resolving the contradiction between improving antistatic properties and maintaining strength
Solution Approach 2:
The patent creates a composite material system where the conductive polymer is chemically integrated with the binder through specific functional group interactions. This composite approach allows the conductive polymer to be embedded within the cured binder matrix, maintaining both the antistatic function and the mechanical integrity of the coating layer
2Reliability
If the amount of conductive material is increased until sufficient conductivity is obtained, then antistatic properties are improved, but coloration and costs increase
Solution Approach 1:
The patent changes the intrinsic conductivity parameters of the polymer by selecting highly conductive polymer types (polyaniline, polypyrrole, polythiophene and their copolymers) and optimizing their molecular structure. This allows achieving sufficient conductivity with lower material concentrations, reducing both coloration issues and manufacturing costs while maintaining antistatic performance
3Length of stationary object
If a volatile solvent-containing composition containing only a conductive polymer composition and an ionizing radiation curable compound is coated to prepare a thin film, then film thickness is reduced, but liquid viscosity is low so surface properties become non-uniform
Solution Approach 1:
The patent changes the viscosity parameters of the coating composition by carefully selecting the volatile solvent type and concentration. The solvent system is optimized to provide appropriate viscosity for thin film coating, ensuring uniform surface properties while enabling formation of films with thickness of 1 μm or less. The functional groups on the conductive polymer also contribute to proper wetting and uniform distribution
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 solution achieves high antistatic properties and scar resistance with improved surface uniformity and durability, preventing conductivity loss during saponification treatments, and allows for the use of the optical laminate in polarizing plates and image display devices.
Implementation Method 1
an ionizing radiation curable compound
Data Source
AI summary
An optical laminate includes a support and an antistatic layer formed from a composition containing the following (A) to (C) and having an average thickness of from 0.03 to 0.40 μm: (A) a hydrophobilized conductive polymer composition containing a π-conjugated system conductive polymer and an anion group-containing polymer dopant; (B) an inorganic particle having an average particle size of from 1 to 300 nm; and (C) an ionizing radiation curable compound.