Grain Retention Polymer Composition for Automotive Foils
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Solution Overview
Problem
Existing polymer foils used in automotive interiors require irradiation treatments for grain stability, which hinders recyclability and affects physical properties.
Innovation Solution
A polymer composition with a gel content of less than 30% that does not require additional crosslinking treatments, maintaining excellent grain stability, elasticity, and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If irradiation treatment is applied to form covalent crosslinks in the foil, then grain stability is improved, but recyclability deteriorates and physical properties are adversely affected
Solution Approach 1:
The patent changes the chemical structure parameters by using polymers with specific molecular weights and compositions that provide inherent grain stability without requiring covalent crosslinks. The composition specifies particular polymer ratios and molecular characteristics that enable stable grain retention through physical rather than chemical bonding, thus maintaining recyclability.
Solution Approach 2:
The patent replaces the chemical crosslinking mechanism (covalent bonds formed by irradiation) with a physical mechanism based on polymer morphology and molecular entanglement. The grain stability is achieved through the physical structure of the polymer chains and their arrangement, eliminating the need for chemical crosslinks and subsequent irradiation treatments.
2Stability of the object's composition
If covalent crosslinks are formed by irradiation treatment, then grain stability is improved, but the physical properties of the foil are adversely affected
Solution Approach 1:
The patent optimizes polymer parameters including molecular weight distribution, composition ratios, and crystallinity to achieve grain stability without excessive crosslinking. By carefully controlling these parameters, the material maintains both stable grain structure and desirable physical properties such as elasticity and flexibility.
Solution Approach 2:
The patent uses composite polymer systems combining different polymer types with complementary properties. The composition includes specific ratios of polymers that work together to provide grain stability through their combined physical structure rather than through crosslinking, thereby preserving overall physical properties.
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 composition allows for high thermoforming stretches at higher temperatures than conventional uncrosslinked formulations, enabling complex geometry formation and improved recyclability.
Implementation Method 1
The embossed foil needs to have a high gel content to have sufficient grain stability during the subsequent step of positive thermoforming
Implementation Method 2
The polymers in the foil are covalently crosslinked by the irradiation treatment
Implementation Method 3
a step of positive thermoforming the embossed foil
Implementation Method 4
The composition is thermoformable at a thermoforming temperature in the range of 120 °C to 150 °C
Implementation Method 5
the composition shows facilitated processability and recyclability as well as an excellent balance of physical properties such as grain stability, elasticity, and flexibility
Data Source
AI summary
A composition containing polymers, having a gel content of less than 30 %, and having at least one of the following properties (a) to (c) in a test according to ISO 6721-10:2015 at 130 °C: (a) the tanδ is less than 0.35, (b) the maximum creep deformation is less than 5 %, (c) the slope of the creep is less than 0.0080 in the plateau at 100 to 300 s; a sheet consisting of a foil or comprising the foil, wherein the foil is made of the composition; a process of producing an embossed and thermoformed sheet; the use of a sheet as a surface material in the interior of a vehicle.