Olefin Polymer Carpet Backing Composition for High Filler Loading
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Solution Overview
Problem
Current polymer compositions for carpet backing face challenges with high viscosity and deteriorated mechanical properties due to increased filler content, necessitating novel formulations that balance tensile elongation and viscosity while being recyclable and suitable for high filler loading.
Innovation Solution
A composition comprising a first and second ethylene/alpha-olefin interpolymer with a significant difference in melt index, combined with a filler present in at least 50 wt% and a tackifier, maintaining low melt viscosity and excellent mechanical properties, allowing for recyclability and effective processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If filler content is increased to improve dimensional stability and reduce cost, then manufacturing cost decreases and dimensional stability improves, but viscosity increases significantly and mechanical properties deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer matrix by using specific ethylene/alpha-olefin copolymer ratios with controlled melt indices (I2 values). This parameter optimization allows the formulation to accommodate high filler loads (≥50 wt%) while maintaining manageable viscosity levels and acceptable mechanical properties, directly resolving the contradiction between filler content and viscosity.
Solution Approach 2:
The patent creates a composite material system consisting of ethylene/alpha-olefin copolymers combined with inorganic fillers and tackifiers. This composite approach allows the synergistic interaction between polymer matrix and filler particles to achieve dimensional stability and cost reduction while the polymer composition is specifically designed to prevent excessive viscosity increase, thus resolving the technical contradiction.
2Stability of the object's composition
If filler content is increased to improve dimensional stability, then dimensional stability improves, but tensile elongation at break deteriorates
Solution Approach 1:
The patent optimizes the polymer matrix parameters by selecting ethylene/alpha-olefin copolymers with specific melt index ranges and copolymer ratios. This parameter control ensures that the polymer matrix maintains sufficient flexibility and elongation capacity even when containing ≥50 wt% filler, thereby resolving the contradiction between dimensional stability and tensile elongation at break.
Solution Approach 2:
The polymer matrix acts as an intermediary between the filler particles and the mechanical loading. By carefully designing the polymer composition (ethylene/alpha-olefin copolymers with controlled properties), the matrix effectively transfers and distributes stress around filler particles, preventing stress concentration that would lead to premature failure, thus maintaining both dimensional stability and tensile elongation.
3Quantity of substance
If filler content is increased to reduce cost, then manufacturing cost decreases, but mechanical properties deteriorate
Solution Approach 1:
The patent changes the formulation parameters by using specific ratios of ethylene/alpha-olefin copolymers with different melt indices and incorporating tackifiers. This optimized parameter set allows the system to achieve high filler loading (≥50 wt%) for cost reduction while the polymer matrix composition is specifically tuned to maintain mechanical integrity, resolving the contradiction between cost reduction and mechanical property preservation.
Data Source
AI summary
A composition comprising the following components: A) a first ethylene/alpha-olefin interpolymer with a melt index I2A; B) a second ethylene/alpha-olefin interpolymer with a melt index I2B; and wherein the difference in melt index (I2): (I2A−I2B)≥400, and wherein I2B≤100 g/10 min; C) a filler, and wherein the filler is present in an amount ≥50 wt %, based on the weight of the composition; D) a tackifier; and wherein the melt viscosity, at 165 C, of the composition, excluding the filler (component C), is ≤30,000 cP.