Multi-layer Decorative Film with Polycarbonate Acrylic Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current decorative molding films, such as acrylic and polycarbonate films, fail to simultaneously achieve excellent heat resistance, surface hardness, transparency, and trimming properties, with existing multi-layer films being unsatisfactory in terms of thermoformability and appearance.
Innovation Solution
A multi-layer film comprising a polycarbonate resin layer with a viscosity average molecular weight of 13,000 to less than 20,000, combined with acrylic resin layers on both sides, where the polycarbonate layer accounts for 5 to 30% of the total thickness, and produced through coextrusion to achieve improved heat resistance, surface hardness, and trimming properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If acrylic films are used as base films for decorative molding, then transparency and weather resistance are improved, but heat resistance deteriorates and brittleness increases making them easily broken
Solution Approach 1:
The patent uses a multi-layer composite structure combining acrylic resin layers (providing transparency and weather resistance) with polycarbonate resin layers (providing heat resistance and reduced brittleness). This composite approach allows the film to simultaneously achieve high transparency, excellent weather resistance, and improved heat resistance without excessive brittleness.
2Illumination intensity
If acrylic films are used as base films for decorative molding, then transparency and weather resistance are improved, but trimming properties worsen due to high brittleness causing easy breaking
Solution Approach 1:
The multi-layer composite structure combines acrylic resin (providing transparency) with polycarbonate resin (providing improved toughness and trimming properties). The polycarbonate layer reduces overall brittleness while maintaining the transparency characteristics of the acrylic layer, enabling easier trimming without breaking.
3Temperature
If polycarbonate films are used as base films for decorative molding, then heat resistance is improved, but trimming properties worsen due to high ductility making them hardly broken
Solution Approach 1:
The patent combines polycarbonate resin layers (providing heat resistance) with acrylic resin layers (providing improved trimming properties through controlled brittleness). This composite structure maintains the heat resistance of polycarbonate while the acrylic components enhance trimmability by reducing excessive ductility.
4Temperature
If multi-layer films with acrylic resin on polycarbonate resin are used, then heat resistance and surface hardness are improved, but trimming properties and transparency deteriorate
Solution Approach 1:
The patent optimizes the molecular weight parameters of the polycarbonate resin (viscosity average molecular weight of 20,000 to 50,000) and controls the thickness ratios of different layers (polycarbonate layer thickness ratio of 10-40%). These parameter optimizations improve transparency while maintaining heat resistance, unlike conventional multi-layer films that sacrifice transparency for heat resistance.
5Strength
If multi-layer films with acrylic resin on polycarbonate resin are used, then surface hardness is improved, but trimming properties worsen
Solution Approach 1:
The patent changes the molecular weight parameter of polycarbonate resin to a specific range (20,000 to 50,000 viscosity average molecular weight) and optimizes layer thickness ratios. This parameter optimization achieves a balance where surface hardness is improved through the polycarbonate layer while trimming properties are maintained through controlled brittleness from the overall structure.
Data Source
AI summary
A multi-layer film having excellent surface hardness and transparency, a small heat shrinkage factor and such high brittleness that it is easily trimmed after decorative molding. The multi-layer film comprises a layer (layer A) which contains a polycarbonate resin having a viscosity average molecular weight of 13,000 or more to less than 20,000 and layers (layer B-1 and layer B-2) which contain an acrylic resin and are formed on both sides of the layer A, respectively, wherein the total thickness of the multi-layer film is 50 to 200 μm, and the thickness of the layer A accounts for 5 to 30 $ of the total thickness.