Clear-Layer Laminate Composition for Stretchability and Solvent Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing laminates struggle to achieve both stretchability and solvent resistance, which are essential for effective surface protection, particularly in automotive exterior parts.
Innovation Solution
A laminate comprising a base film and a clear layer formed by curing a composition containing a fluorinated polymer with hydroxy or carboxy groups, a non-fluorinated polymer, and a curing agent, where the fluorinated polymer content is limited to at most 30% of the total, with specific molecular weight and hydroxy or acid value ranges, enhancing both stretchability and solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sheet for coating film protection with adhesive layer is used, then solvent resistance is improved, but stretchability deteriorates
Solution Approach 1:
The invention uses a composite clear layer comprising a fluorinated polymer and a non-fluorinated polymer in specific proportions (fluorinated polymer: 1-30 mass%, non-fluorinated polymer: 70-99 mass%). The fluorinated polymer provides solvent resistance while the non-fluorinated polymer provides stretchability, achieving both properties simultaneously through material composition rather than single-material solutions.
Solution Approach 2:
The invention optimizes specific parameters including the fluorinated polymer content (1-30 mass%), hydroxy value or acid value (20-400 mgKOH/g), and number average molecular weight (at most 6,000). These parameter adjustments balance the competing requirements of solvent resistance and stretchability by fine-tuning the polymer composition and structure.
2Reliability
If fluorinated polymer content is increased to improve solvent resistance, then solvent resistance is improved, but stretchability deteriorates
Solution Approach 1:
The invention establishes an optimal parameter range for fluorinated polymer content (1-30 mass%, preferably 1-10 mass%). Within this range, sufficient solvent resistance is achieved while maintaining adequate stretchability. The specific parameter optimization prevents the trade-off from becoming a contradiction by identifying the optimal balance point.
Solution Approach 2:
The invention assigns different functional roles to different polymer components within the clear layer. The fluorinated polymer (minor component) provides localized solvent resistance, while the non-fluorinated polymer (major component) provides localized stretchability. This functional differentiation allows both properties to coexist without mutual interference.
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 laminate exhibits improved stretchability and solvent resistance, making it suitable for applications requiring both properties, such as automotive exterior parts.
Implementation Method 1
a curing agent having functional groups that react with the hydroxy or carboxy groups
Data Source
AI summary
To provide a laminate excellent in stretchability and solvent resistance. A laminate comprising a base film and a clear layer, wherein the clear layer is a layer formed by curing a composition containing a fluorinated polymer having hydroxy or carboxy groups, a non-fluorinated polymer, and a curing agent having functional groups that react with the hydroxy or carboxy groups, and the hydroxy value or acid value of the fluorinated polymer is at least 20 mgKOH/g, and the content of the fluorinated polymer is at most 30 mass % to the total content of the fluorinated polymer and the non-fluorinated polymer.