Formable Anti-glare Polymer Films for IMD
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Solution Overview
Problem
Existing anti-glare polymer films are not suitable for forming processes like in-mold decoration due to poor formability and susceptibility to cracking, especially at the edges of formed samples, despite having good scratch, solvent, and chemical resistance.
Innovation Solution
A formable anti-glare polymer film with a textured surface coated using a composition containing difunctional (meth)acrylic monomers and multifunctional (meth)acrylates, achieving a specific crosslinking density range that balances formability with pencil hardness and chemical resistance, allowing the film to be formed without edge damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating with high crosslinking density is applied to improve scratch and chemical resistance, then surface hardness and chemical resistance are improved, but formability deteriorates and cracking occurs during forming
Solution Approach 1:
The patent applies parameter changes by carefully controlling the crosslinking density within a specific range (0.5-5.0 mmol/g) rather than maximizing it. This optimized parameter range achieves the balance between surface hardness/scratch resistance and formability, preventing cracking while maintaining protective properties.
Solution Approach 2:
The patent uses composite materials by combining specific binder types (polyester acrylate, polyether acrylate, or urethane acrylate with specified viscosity ranges) with controlled crosslinking agents. This composite coating formulation achieves both durability and formability that single-component systems cannot provide.
2Reliability
If a coating with high crosslinking density is applied to improve solvent and chemical resistance, then chemical resistance is improved, but formability deteriorates and edge damage occurs
Solution Approach 1:
The patent applies parameter changes by controlling the crosslinking density within the optimized range of 0.5-5.0 mmol/g and selecting binders with specific viscosity ranges (100-10,000 cP). These parameter optimizations ensure the coating maintains chemical resistance while remaining formable without edge damage during processing.
Solution Approach 2:
The patent uses composite materials through the specific combination of polyester acrylate, polyether acrylate, or urethane acrylate binders with controlled molecular weights and viscosities, combined with appropriate crosslinking agents. This composite system provides both chemical resistance and formability.
3Strength
If the coating layer thickness is increased to improve protective properties, then scratch and chemical resistance are improved, but formability deteriorates and cracking susceptibility increases
Solution Approach 1:
The patent applies parameter changes by optimizing the coating thickness within the range of 1-10 μm. This controlled thickness parameter ensures sufficient protective properties while maintaining formability and preventing cracking during subsequent forming operations.
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 film achieves anti-glare properties combined with good formability, pencil hardness, solvent, and chemical resistance, enabling successful formation in processes like in-mold decoration without edge defects.
Implementation Method 1
The coating composition comprises a binder comprising at least one polyester acrylate, at least one polyether acrylate, or at least one urethane acrylate; and a crosslinking agent
Data Source
Figure 1
AI summary
Provided is a formable anti-glare polymer film wherein a thermoplastic polymeric film having at least one textured surface and a coating on the textured surface said coating being obtainable by coating with a coating composition comprising (a) a binder, comprising at least one difunctional (meth)acrylic monomer and/or difunctional (meth) acrylate oligomer; and (b) a crosslinking agent, comprising at least one multifunctional (meth) acrylic monomer, wherein said coating composition has a theoretical crosslinking density in the range of from <2.0•10 -3, preferably of from ≤1.99•10 -3to ≥0.1•10 -3, more preferably of from≤1.85•10 -3to ≥0.2•10 -3, and a process for producing such film. Furthermore it relates to molded articles, particularly molded articles obtainable by in-mold decoration (IMD) processes, and the use of the formable anti-glare films for the manufacture of molded articles.