Carpet comprising a propylene-based elastomer and methods of making the same
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Solution Overview
Problem
Existing carpet backing systems lack adequate tuft bind strength, tuft lock strength, and flexibility, and they decompose when exposed to water, leading to unreliable construction and reduced service life, particularly with latex-based systems.
Innovation Solution
A carpet backing system utilizing a layer of propylene-based elastomers, which can replace both the precoat and thermoplastic laminate layers, providing enhanced tuft bind and lock strength, flexibility, and improved flame retardancy, with the option to include fillers like aluminum trihydrate for additional benefits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If latex-based precoat systems are used to affix yarn to the primary backing layer, then tuft bind strength is achieved, but the system decomposes when exposed to water, leading to reduced reliability
Solution Approach 1:
The patent changes the chemical composition parameter of the precoat layer from latex-based polymers to propylene-based elastomers. This material substitution eliminates the water decomposition issue inherent in latex systems while maintaining the necessary adhesive strength for tuft binding, thereby resolving the contradiction between achieving initial strength and maintaining long-term reliability in wet conditions.
Solution Approach 2:
The patent employs a composite material system where propylene-based elastomers are combined with inorganic fillers (such as calcium carbonate or aluminum trihydrate). This composite approach provides both the adhesive properties needed for tuft bind strength and the water resistance required for construction reliability, as the propylene-based matrix does not decompose in water unlike latex systems.
2Reliability
If traditional latex and thermoplastic laminate layers are used, then adequate backing functionality is achieved, but the carpet lacks sufficient flexibility
Solution Approach 1:
The patent modifies the material parameters by replacing rigid thermoplastic laminate layers with propylene-based elastomers. Elastomers inherently possess greater flexibility and elasticity compared to traditional thermoplastics, allowing the carpet backing to bend and flex more easily while still providing adequate structural support and functionality.
Solution Approach 2:
The patent utilizes the elastomeric properties of propylene-based materials to create a flexible backing system. The elastomer layer acts as a flexible film that can accommodate bending and deformation, thereby improving the ease of operation and installation of the carpet while maintaining necessary backing functions.
3Object-affected harmful factors
If inorganic fillers are added to latex precoat systems, then flame retardancy is improved, but the system still decomposes in water and loses effectiveness
Solution Approach 1:
The patent creates a composite material system where propylene-based elastomers serve as the matrix and inorganic fillers (such as aluminum trihydrate or calcium carbonate) are dispersed within. The propylene-based matrix provides water resistance and structural integrity in wet conditions, while the inorganic fillers contribute flame retardancy. This composite approach allows both functionalities to coexist without the decomposition issues of latex systems.
Solution Approach 2:
The patent replaces the short-lived latex binder with a durable propylene-based elastomer that does not decompose. The inorganic fillers provide the flame retardant function, while the propylene matrix ensures long-term stability in wet environments, effectively creating a system where the flame retardant properties are maintained without the water sensitivity of latex.
Data Source
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Figure 2c~2d
AI summary
Provided are carpets comprising at least one propylene-based elastomer. The presence of the propylene-based elastomer provides the carpet with improved properties, including good tuft bind strength and tuft lock strength, and reliable construction.