Isotactic Polyolefin Flooring Binders for Penetration and Adhesion
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Solution Overview
Problem
Existing floor coverings, such as carpets and artificial turf, face challenges in achieving a combination of low melt viscosity, high tensile strength, flexibility, and adhesive shear strength, particularly on untreated polyolefin surfaces, due to the limitations of amorphous polyolefins used in current production methods.
Innovation Solution
The use of polyolefins with specific isotactic structural elements, containing up to 20% ethylene, 70-100% propylene, or 80-100% 1-butene, with triad distributions that prioritize isotactic and atactic proportions for optimal cohesion and adhesion, enabling low melt viscosity and high tensile strength while ensuring flexibility and good adhesion on untreated polyolefin surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If amorphous polyolefins with high melt viscosity are used, then tensile strength and flexibility are improved, but penetration of carpet raw material and adhesion are insufficient
Solution Approach 1:
The patent changes the molecular structure parameters of polyolefins by introducing specific isotactic structural elements while controlling ethylene content (5-20 wt%) and propylene content (80-95 wt%). This creates a unique polymer structure that achieves both low melt viscosity (500-5000 mPa·s at 190°C) for good penetration and high tensile strength through controlled crystallinity from isotactic sequences.
Solution Approach 2:
The patent creates a composite polymer system combining isotactic structural elements (for strength and crystallinity) with ethylene copolymer components (for flexibility and low viscosity). This composite approach at the molecular level allows simultaneous achievement of penetrating ability and mechanical strength that neither component could provide alone.
2Strength
If amorphous polyolefins with high melt viscosity are used, then tensile strength is improved, but adhesive shear strength on untreated polyolefin surfaces is insufficient
Solution Approach 1:
The patent modifies the surface interaction parameters by controlling the isotactic triad distribution (70-90%) and comonomer composition. This creates a polymer with optimal balance between crystalline regions (providing strength) and amorphous regions with exposed functional groups (providing adhesion to untreated polyolefin surfaces without requiring extensive formulation additives).
3Productivity
If low application weight is achieved, then productivity and economy are improved, but sufficient penetration and integration of nubs and filaments cannot be ensured
Solution Approach 1:
The patent optimizes the rheological parameters by controlling melt viscosity to 500-5000 mPa·s at 190°C through specific isotactic structure design. This low viscosity enables complete penetration at reduced application weights while the controlled isotactic content ensures rapid crystallization and strong bonding upon cooling, achieving both productivity and reliability.
4Use of energy by moving object
If complex formulation of amorphous polyolefins is used, then adhesive shear strength is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The patent extracts and eliminates the need for complex multi-component formulations by incorporating adhesive functionality directly into the polyolefin backbone through isotactic structural elements. This single-polymer solution replaces complex blends of amorphous polyolefins with additives, simplifying the formulation while maintaining high adhesive shear strength on untreated surfaces.
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
This approach allows for the production of floor coverings with improved properties, including complete penetration of carpet raw material, effective nub and filament integration, and economical manufacturing, while maintaining high adhesive shear strength and flexibility.
Implementation Method 1
low melt viscosity at the application temperature
Implementation Method 2
low melt viscosity ensures good and complete penetration of the carpet raw material through the hot melt adhesive
Implementation Method 3
high adhesive shear strength on untreated polyolefin surfaces
Data Source
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AI summary
The invention relates to the use of polyolefins having isotactic structural elements in flooring materials, especially in carpets or artificial turf.