Polypropylene-Silica Wear Layer for PVC-Free Resilient Flooring
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Solution Overview
Problem
Existing luxury vinyl tile (LVT) wear layers face challenges in achieving a balance of scratch/abrasion resistance, optical clarity, flexibility, and adhesion while being PVC-free, recyclable, and halogen-free to prevent hazardous combustion products.
Innovation Solution
A composition comprising at least 50 wt% of a propylene/ethylene-based polymer with specific properties and 0.5 to 10.0 wt% silica filler, used as the top layer in LVT flooring, providing excellent abrasion resistance and optical clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If plasticized polyvinyl chloride (P-PVC) is used in LVT wear layers, then scratch/abrasion resistance and flexibility are improved, but environmental harm increases due to plasticizer emissions and hazardous combustion products
Solution Approach 1:
The patent removes PVC and its harmful plasticizers from the wear layer composition entirely, extracting the problematic substance while maintaining the essential wear resistance function through alternative materials (polyester polymer with silica filler)
Solution Approach 2:
The patent changes the fundamental chemical composition parameters by substituting PVC-based materials with polyester polymer-based materials, fundamentally altering the material system to eliminate harmful emissions while maintaining performance
2Adaptability or versatility
If polypropylene/inorganic particle blend compositions are used, then PVC-free and recyclable properties are achieved, but scratch/abrasion resistance and optical clarity are insufficient
Solution Approach 1:
The patent creates a composite material system combining polyester polymer with silica filler particles, where the polyester provides flexibility and adhesion while the silica provides scratch resistance and optical clarity, achieving a synergistic effect that satisfies all performance requirements
3Strength
If higher filler content is added to improve scratch resistance, then abrasion resistance increases, but optical clarity and flexibility deteriorate
Solution Approach 1:
The patent optimizes the filler content parameter to a specific range (0.5 to 10.0 wt%) and uses silica particles with controlled morphology and size distribution, changing the physical parameters of the filler to achieve both scratch resistance and optical clarity simultaneously
Data Source
Figure 1~2
AI summary
Embodiments of this invention relate to a composition composed of at least (A) a propylene-based polymer, and (B) a filler dispersed within the propylene-based polymer, which can be used as a wear layer on a resilient flooring or other substrate, among other uses.