Polymeric Formulation Dirt Pick-Up Resistance Roofing Membranes
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Solution Overview
Problem
Existing materials for applications exposed to contamination, such as roofing membranes, require coatings or secondary production processes to achieve adequate dirt pick-up resistance, which is not ideal for simplicity and efficiency.
Innovation Solution
A polyolefin-based composition comprising an ethylene/acrylate interpolymer, an ethylene/α-olefin multi-block copolymer, and a flame retardant, which provides improved dirt pick-up resistance without the need for coatings or secondary processes, specifically formulated for use in roofing membranes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coatings or surface modification techniques are applied to achieve dirt pick-up resistance, then DPUR is improved, but device complexity and manufacturing process complexity increase
Solution Approach 1:
The patent combines multiple functions (dirt pick-up resistance, flame retardance, flexibility) into a single polyolefin-based composition. The composition integrates polymers (ethylene/acrylate interpolymer, ethylene/α-olefin multi-block copolymer) and flame retardants into one material system, eliminating the need for separate coatings or surface modification processes while achieving DPUR ≥ 4.0.
Solution Approach 2:
The invention uses a composite polyolefin-based composition comprising multiple polymer components and flame retardants. Specifically, it combines ethylene/acrylate interpolymer (5-30 wt%), ethylene/α-olefin multi-block copolymer (20-50 wt%), and flame retardant (20-50 wt%) to create a multi-functional material that provides DPUR, flame resistance, and flexibility without additional processing steps.
2Reliability
If coatings or secondary production processes are used to achieve dirt pick-up resistance, then DPUR is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent merges the dirt pick-up resistance function with the base polymer composition itself. The polyolefin-based composition is formulated to inherently provide DPUR ≥ 4.0 through its polymer structure and composition, allowing it to be manufactured using standard extrusion and molding processes without requiring separate coating or surface treatment operations.
Solution Approach 2:
The polyolefin-based composition provides dirt pick-up resistance as an inherent property of the material itself, rather than requiring external coatings or treatments. The composition 'serves itself' by incorporating flame retardants and polymers that collectively provide DPUR, flame resistance, and flexibility within the bulk material structure.
3Object-affected harmful factors
If flame retardants are added to achieve flame retardance, then fire safety is improved, but productivity may deteriorate due to additional processing steps
Solution Approach 1:
The patent combines flame retardant functionality with the polymer composition in a single manufacturing process. The polyolefin-based composition incorporates flame retardants (20-50 wt%) directly into the material formulation, allowing simultaneous production of flame-retardant and high-DPUR roofing membranes through standard extrusion processes without additional treatment steps.
Data Source
AI summary
The present disclosure provides a composition. In an embodiment, the composition includes A) an ethylene/acrylate interpolymer or an ethylene/acetate interpolymer; B) an ethylene/α-olefin multi-block copolymer; and C) a flame retardant. In an embodiment, the ethylene/acrylate interpolymer is a functionalized ethylene/acrylate interpolymer. The present composition exhibits improved dirt pick-up resistance.