Olefin Block Copolymer Carpet Backing for Tuft Bind and Flexibility
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Solution Overview
Problem
Current carpet backing systems face challenges in achieving adequate tuft bind strength, abrasion resistance, and flexibility while maintaining recyclability, with existing polyolefin systems having high viscosities and recrystallization temperatures that hinder efficient extrusion coating and yarn penetration.
Innovation Solution
The use of ethylene/α-olefin block interpolymers with specific molecular weight distributions and filler compositions, applied through extrusion coating, provides improved tuft bind strength, abrasion resistance, and flexibility, while allowing for recyclability by ensuring good adhesion and penetration of yarns without extensive handling or segregation of materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional polyolefin systems are used for carpet backing, then flexibility and ease of application are improved, but tuft bind strength and abrasion resistance deteriorate
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight distribution (Mw/Mn ratio between 1.05 and 2.5) and comonomer content (5-30 mol%) of the polyolefin interpolymer. These parameter optimizations enable the polymer to achieve both good flexibility for application and sufficient tuft bind strength, resolving the contradiction between ease of application and binding strength.
2Ease of operation
If polyolefin systems with high viscosity are used, then flexibility is improved, but extrusion coating efficiency deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the molecular weight distribution parameters, specifically controlling the Mw/Mn ratio between 1.05 and 2.5 and adjusting the comonomer content. These parameter changes reduce polymer viscosity while maintaining flexibility, enabling efficient extrusion coating and yarn penetration without sacrificing the flexibility needed for proper carpet backing performance.
3Adaptability or versatility
If polyolefin systems are used for carpet backing, then recyclability is improved, but tuft bind strength and abrasion resistance deteriorate
Solution Approach 1:
The patent maintains recyclability by using polyolefin interpolymers that can be processed and recycled through conventional polyolefin recycling streams. Simultaneously, it improves abrasion resistance by optimizing the molecular weight distribution (Mw/Mn between 1.05 and 2.5) and comonomer content (5-30 mol%), which enhance the mechanical properties and binding strength of the carpet backing while preserving its recyclability.
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 ethylene/α-olefin block interpolymer system enhances tuft bind strength, abrasion resistance, and flexibility, enabling high carpet production rates and recyclability, while maintaining dimensional stability and barrier properties.
Implementation Method 1
wherein the ethylene/α-olefin block interpolymer is mesophase separated
Implementation Method 2
has at least one melting point, Tm, in degrees Celsius
Data Source
AI summary
A carpet includes (a) a primary backing which has a face and a back surface, (b) a plurality of fibers attached to the primary backing and extending from the face of the primary backing and exposed at the back surface of the primary backing, (c) an adhesive backing, (d) an optional secondary backing adjacent to the adhesive backing, and (e) at least one olefin block copolymer, especially ethylene based block copolymers An olefin block copolymer is extrusion coated onto the back surface of a primary backing to provide an adhesive backing Additional steps and procedures can include washing or scouring the primary backing and fibers prior to the extrusion step, and utilizing implosion agents The preferred olefin block copolymer is an ethylene based block interpolymers The constructions and methods are suited for making tufted, broad-loom carpet having improved abrasion resistance.