Transparent Multilayer Sheet with Conductive Polyurethane Surface
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Solution Overview
Problem
Existing transparent multilayer sheets face challenges in maintaining anti-static properties while ensuring transparency, as low-molecular weight anti-static agents degrade under high temperatures and have compatibility issues, and conductive polymer coatings peel off easily, leading to hot spots and mechanical property deterioration.
Innovation Solution
A transparent multilayer sheet is developed with a surface layer comprising a conductive thermoplastic polyurethane or polyurea resin containing ethylene oxide, combined with a back layer of a transparent non-conductive polymer resin, enhancing compatibility and electrostatic dissipative properties without the risks of elution or peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low-molecular weight anti-static agent is added to polymer materials, then electrostatic dissipative properties are improved, but thermal resistance deteriorates causing degradation under high-temperature processing conditions
Solution Approach 1:
The patent uses a composite structure combining a conductive polymer layer (with inherently dissipative polymer IDP) and a transparent polymer layer. This composite approach allows the conductive layer to provide electrostatic dissipative properties while the transparent layer maintains optical clarity and thermal stability, avoiding the thermal degradation issues of low-molecular weight anti-static agents.
2Reliability
If a conductive polymer coating is applied to plastic surface, then electrostatic dissipative properties are improved, but adhesion deteriorates causing peeling off and hot spot generation
Solution Approach 1:
The patent merges the conductive polymer layer and transparent polymer layer into a single integrated multilayer sheet structure. The layers are bonded together through compatible material selection and processing, eliminating peeling issues. The conductive polymer IDP is combined with a binder material in solvent to form a cohesive coating that adheres properly to the substrate.
3Reliability
If organic or inorganic filler is mixed with polymer resin, then electrostatic dissipative properties are improved, but mechanical properties deteriorate due to excess filler content
Solution Approach 1:
The patent changes the approach from using inorganic/organic fillers to using inherently dissipative polymers (IDP) as the conductive component. This parameter change allows achieving electrostatic dissipative properties without the mechanical property deterioration caused by high filler content (more than 10% by weight). The IDP-based conductive layer provides sufficient conductivity while maintaining mechanical integrity.
4Reliability
If carbon black is used as filler in polymer composite resin, then electrostatic dissipative properties are improved, but surface contamination occurs due to elution
Solution Approach 1:
The patent extracts carbon black and other inorganic/organic fillers from the polymer composite resin, replacing them with inherently dissipative polymers (IDP). This extraction eliminates the elution problem that causes surface contamination of packaged products while maintaining electrostatic dissipative properties through the IDP-based conductive layer.
5Reliability
If inherently dissipative polymer is blended with another resin, then electrostatic dissipative properties are improved, but transparency deteriorates due to refractive index difference
Solution Approach 1:
The patent segments the sheet into multiple layers: a conductive polymer layer containing IDP for electrostatic dissipative properties, and a separate transparent polymer layer for optical clarity. This segmentation allows each layer to optimize its specific function without compromising the other, avoiding the transparency deterioration that occurs when IDP is blended with other resins due to refractive index differences.
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 provides superior transparency and permanent electrostatic dissipative properties, reducing the risk of peeling between layers and maintaining mechanical integrity, making it suitable for applications requiring both transparency and anti-static performance.
Implementation Method 1
a surface layer which comprises a conductive thermoplastic polyurethane or polyurea resin containing ethylene oxide
Implementation Method 2
there is little fear of peel-off between a conductive polymer layer and a non-conductive polymer layer because compatibility therebetween is excellent
Data Source
AI summary
Disclosed is a transparent multilayer sheet that is excellent in antistatic properties, as well as transparency. The transparent multilayer sheet includes a surface layer comprising a conductive thermoplastic polyurethane or polyurea resin containing ethylene oxide; and a back layer attached to the surface layer and comprising a transparent non-conductive polymer resin. Preferably, the polyurethane or polyurea resin is a polymerization product of (a) a polyether-based polymer containing ethylene oxide and reacting with an isocyanate group; (b) an aromatic or aliphatic diisocyanate compound; and (c) a chain extender C2 to C10 containing a primary hydroxyl group or an amine group, and the transparent non-conductive polymer resin is selected from the group consisting of polyethylene terephthalate, glycol modified polyethylene tereph-thalate, glycol modified polycyclohexaneterephthalate, polymethylmethacrylate, polycarbonate, transparent acrylonitrile-butadiene-styrene (ABS), and mixtures thereof.