Metallizable ABS Coating Composition for Scratch Resistance
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Solution Overview
Problem
Existing film insert moulding technologies face challenges in achieving a coating that provides adequate blocking resistance, scratch resistance, solvent resistance, and metallizability, particularly for ABS layers in polycarbonate/ABS coextrusion films, which are inadequate in thickness and solvent resistance for advanced applications.
Innovation Solution
A coating composition comprising at least 30% thermoplastic acrylonitrile-butadiene-styrene copolymer, 30% UV-curable reactive diluent, 0.1-10 parts by weight photoinitiator, and ethylenically unsaturated groups, allowing for thermal formability and UV curing to achieve scratch-resistant and solvent-resistant surfaces that are metallizable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating composition containing thermoplastic ABS copolymer and UV-curable reactive diluent is applied, then scratch resistance and solvent resistance are improved, but the complexity of the coating system increases
Solution Approach 1:
The patent combines thermoplastic ABS copolymer and UV-curable reactive diluent into a single coating composition that can be applied in one layer. This merging of functions (blocking resistance from ABS, scratch resistance from UV-curable components, and solvent resistance from the crosslinked network) eliminates the need for separate coating layers, thereby improving reliability while managing system complexity through integration rather than multiplication of components.
Solution Approach 2:
The coating composition creates a composite material system where thermoplastic ABS copolymer provides the base matrix with blocking resistance, while UV-curable reactive diluent forms a crosslinked network that enhances scratch and solvent resistance. This composite structure allows both materials to contribute their unique properties synergistically, achieving superior performance without proportionally increasing system complexity.
2Illumination intensity
If the ABS layer thickness is reduced to improve transparency, then optical properties are improved, but solvent resistance and blocking resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the coating by incorporating UV-curable reactive diluent with specific functional groups that form a dense crosslinked network. This parameter change allows the coating to achieve enhanced solvent resistance and blocking resistance at reduced thickness, thereby maintaining transparency while improving reliability. The crosslinking density and chemical structure are optimized to provide the required performance at thinner dimensions.
Solution Approach 2:
The coating composition creates local quality variations through its dual-component structure: the thermoplastic ABS copolymer provides the bulk matrix with good optical properties, while the UV-curable reactive diluent creates a densely crosslinked local network at the surface and within the coating matrix. This localized enhancement of crosslinking density provides superior solvent and blocking resistance specifically where needed, without compromising the overall transparency of the thinner coating layer.
3Ease of manufacture
If a coating system is designed to provide blocking resistance, then film formability is improved, but scratch resistance and solvent resistance are insufficient
Solution Approach 1:
The patent designs a universal coating composition that performs multiple functions simultaneously: the thermoplastic ABS copolymer ensures blocking resistance and film formability, while the UV-curable reactive diluent provides scratch resistance and solvent resistance through crosslinking. This multi-functional coating system eliminates the need for separate specialized coatings for each property, achieving ease of manufacture through single-layer application while simultaneously providing all required reliability attributes.
Solution Approach 2:
The coating composition is formulated with pre-selected ratios of thermoplastic ABS copolymer and UV-curable reactive diluent that are optimized to provide both blocking resistance and scratch/solvent resistance from the outset. This preliminary optimization of composition parameters ensures that the coating achieves all required properties in a single application and curing cycle, improving ease of manufacture by eliminating subsequent treatment steps while ensuring reliable performance across all durability metrics.
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 coating composition enables the production of films with enhanced blocking resistance, scratch resistance, and solvent resistance, maintaining transparency and allowing for successful metallization, addressing the limitations of previous ABS layers in film insert moulding processes.
Implementation Method 1
at least one photoinitiator in a content of ≥0.1 to ≤10 parts by weight of the solids content of the coating composition
Implementation Method 2
UV-curable reactive diluent
Data Source
AI summary
The present invention relates to a coating composition comprising at least one thermoplastic acrylonitrile-butadiene-styrene copolymer in a content of at least 30% by weight of the solids content of the coating composition, at least one UV-curable reactive diluent in a content of at least 30% by weight of the solids content of the coating composition, at least one photoinitiator in a content of ≥0.1 to ≤10 parts by weight of the solids content of the coating composition and at least one organic solvent, where the proportion of ethylenically unsaturated groups is at least 3 mol per kg of the solids content of the coating composition. This is used to provide films and mouldings coated therewith, having a metallizable, scratch-resistant and solvent-resistant surface.