Synthetic Shingle Polymer Blends for Cold-Impact Resistance
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Solution Overview
Problem
Traditional synthetic shingles fail to meet desired impact resistance metrics, especially at cold temperatures, due to their composition of polyethylene and polypropylene blended with CaCO3 filler.
Innovation Solution
Incorporation of elastomers and/or plastomers, functionalized polyolefins, and specific polyethylenes in the shingle composition to enhance impact resistance and structural rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional synthetic shingles use polyethylene and polypropylene blended with CaCO3 filler to maintain low cost and structural rigidity, then manufacturing cost is reduced and stiffness is improved, but impact resistance deteriorates especially at cold temperatures
Solution Approach 1:
The patent applies composite materials by blending polyethylene with elastomers (such as polypropylene elastomer, polyethylene elastomer) and/or plastomers to create a multi-phase polymer system. This composite approach allows the shingle to combine the low cost and rigidity of polyethylene with the impact resistance properties of elastomers and plastomers, resolving the contradiction between manufacturing cost and impact resistance
Solution Approach 2:
The patent changes the compositional parameters of the polymer blend by specifying precise weight percentages of each component (e.g., polyethylene 40-70%, elastomer 10-30%, plastomer 5-20%, CaCO3 filler 5-20%). By optimizing these parameters, the formulation achieves both cost-effectiveness and improved impact resistance, particularly at cold temperatures
2Strength
If traditional synthetic shingles use polyethylene and polypropylene with CaCO3 filler to achieve structural rigidity, then stiffness is improved, but impact resistance at cold temperatures deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating elastomers and plastomers in specific proportions (elastomer 10-30%, plastomer 5-20%) within the polyethylene matrix. This compositional parameter change enables the material to maintain flexibility and impact resistance at cold temperatures while preserving structural rigidity through the CaCO3 filler (5-20%)
Solution Approach 2:
The patent creates a composite polymer system where elastomers and plastomers are blended with polyethylene to form a multi-phase material. This composite structure allows the shingle to exhibit both rigidity (from polyethylene and CaCO3) and cold-temperature impact resistance (from elastomer/plastomer phases), resolving the temperature-performance contradiction
3Strength
If traditional synthetic shingles use high filler content to increase stiffness, then structural rigidity is improved, but impact resistance deteriorates
Solution Approach 1:
The patent applies composite materials by creating a multi-phase blend where elastomers and plastomers are distributed within the polyethylene matrix containing CaCO3 filler. This composite structure allows the filler to provide stiffness (maintaining shape) while the elastomeric phases provide impact resistance, resolving the contradiction between stiffness and impact resistance that plagues traditional single-phase formulations
Solution Approach 2:
The patent optimizes the parameter distribution by limiting CaCO3 filler to 5-20% while allocating 10-30% to elastomers and 5-20% to plastomers. This parameter optimization ensures sufficient stiffness from the filler-polyethylene framework while maintaining adequate impact resistance through the elastomeric phases, unlike traditional formulations that use excessive filler
Data Source
AI summary
According to some embodiments, a synthetic shingle may comprise a polymer blend. The polymer blend may comprise an elastomer, a plastomer, or both, the elastomer, the plastomer, or both having a density of from 0.855 to 0.905 g/cc; an inorganic filler; a functionalized polyolefin comprising: a polyolefin grafted with ethylenically unsubstituted dicarboxylic acid or a derivative thereof; or a polyolefin comprising at least one α-olefin copolymerized with ethylenically unsubstituted dicarboxylic acid or a derivative thereof; a first polyethylene having a density of from 0.935 to 0.970 g/cc; and a second polyethylene having a density of 0.905-0.935 g/cc and a melt index (12) of 3-10 g/10 min.