Polyolefin Carpet Backing for Low-Weight High-Adhesion Flooring
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Solution Overview
Problem
Current polyolefin-based floor coverings, such as carpets and artificial turf, face challenges in achieving low application weights with high tensile strength, flexibility, and adhesive shear strength due to the material properties of atactic polypropylene and amorphous olefin polymers, which also pose issues in recyclability and toxicity.
Innovation Solution
The use of polyolefins with specific triad distributions, including atactic, syndiotactic, and isotactic proportions, as determined by 13<C-NMR, to achieve optimal adhesion, flexibility, and heat resistance, allowing for the integration of nubs and filaments while ensuring low melt viscosity and high adhesive shear strength on untreated polyolefins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If amorphous olefin polymers or atactic polypropylene are used for carpet production, then the material can be processed, but the application weight is high and tensile strength is insufficient
Solution Approach 1:
The patent changes the molecular parameters of the polyolefin by controlling the comonomer content (5-20 mol%) and molecular weight (10,000-100,000 g/mol) to achieve optimal balance between melt viscosity, tensile strength, and application weight. This parameter optimization allows low application weights while maintaining high tensile strength.
Solution Approach 2:
The patent uses copolymers of ethylene and higher olefins (propylene, 1-butene, 1-pentene) to create composite material structures that combine the advantages of different monomers, achieving both low melt viscosity for penetration and high tensile strength for durability.
2Adaptability or versatility
If hot melt adhesives based on poly(ethylene-co-vinyl acetate) are used, then carpet backing can be produced, but simultaneous nub and filament integration is not achieved
Solution Approach 1:
The patent optimizes the molecular weight and comonomer content parameters of the polyolefin to achieve the right balance between melt viscosity (for penetration) and adhesive strength (for reliable bonding). This enables the adhesive to simultaneously bond both nubs and filaments effectively.
Solution Approach 2:
The patent creates different local properties within the adhesive material by controlling the molecular weight distribution and comonomer distribution, allowing the adhesive to exhibit both good flow characteristics for penetration and high strength for bonding different carpet elements.
3Quantity of substance
If amorphous polyolefins with high melt viscosity are used, then filler content can be high, but penetration of raw carpet material is insufficient
Solution Approach 1:
The patent reduces the melt viscosity parameter by optimizing molecular weight and comonomer content, enabling the adhesive to penetrate raw carpet material effectively while still maintaining the capacity to carry high filler loads for backing reinforcement.
Solution Approach 2:
The patent creates a dynamic viscosity characteristic where the adhesive has low viscosity at application temperature for good penetration, but develops sufficient viscosity after cooling to support high filler content and provide structural stability.
4Ease of manufacture
If atactic polypropylene is used, then carpet production is possible, but recyclability is poor and toxicological concerns arise
Solution Approach 1:
The patent uses polyolefins with controlled molecular weight and comonomer content that maintain processability while improving recyclability. The optimized material structure allows for better recycling performance and reduced toxicological concerns compared to conventional atactic polypropylene.
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 enables the production of floor coverings with improved material properties, including complete penetration of carpet raw materials, enhanced adhesion, and economic viability, while minimizing environmental impact and toxicity concerns.
Implementation Method 1
enhanced adhesion
Implementation Method 2
low melt viscosity
Implementation Method 3
high adhesive shear strength on untreated polyolefins
Data Source
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AI summary
The present invention relates to the use of polyolefins comprising atactic structural elements in floor coverings, in particular in rugs or artificial lawns.