Metallocene Polyethylene Film Strength and Processability
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Solution Overview
Problem
Polyethylene-based resin films containing calcium carbonate suffer from inferior bag-making processability and film strength, limiting their usability in packaging applications.
Innovation Solution
A polyethylene-based resin composition incorporating an ethylene-α-olefin copolymer polymerized with a metallocene-based catalyst, combined with an inorganic compound like calcium carbonate, ensures excellent moldability and film strength, with specific ratios of resin and inorganic compound optimizing bag-making processability and film properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If calcium carbonate is added to reduce resin usage, then resin consumption is reduced, but bag-making processability deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the resin by introducing a specific copolymer (ethylene-vinyl alcohol copolymer) with controlled vinyl alcohol content (30-80 mass%) and copolymerization ratio (20-70 mass%). This parameter adjustment allows the film to maintain good heat sealing properties and bag-making processability even with 20-60 mass% calcium carbonate addition, thus reducing resin consumption while preserving manufacturability
Solution Approach 2:
The invention creates a composite material system consisting of calcium carbonate (inorganic filler), ethylene-vinyl alcohol copolymer (functional polymer), and polyethylene (base resin). This composite structure leverages the heat-resistant properties of the copolymer to compensate for the heat sealing issues caused by calcium carbonate, achieving both reduced resin usage and maintained processability
2Quantity of substance
If calcium carbonate is added to reduce resin usage, then resin consumption is reduced, but film strength deteriorates
Solution Approach 1:
The invention adjusts the vinyl alcohol content parameter in the ethylene-vinyl alcohol copolymer to be within 30-80 mass%, which provides optimal balance between heat resistance and film strength. Additionally, the copolymerization ratio is controlled at 20-70 mass%, ensuring sufficient polymer matrix continuity to maintain film strength even with high calcium carbonate content (20-60 mass%), thereby reducing resin consumption without sacrificing mechanical properties
Solution Approach 2:
The composite material system combines calcium carbonate particles with the ethylene-vinyl alcohol copolymer matrix, where the copolymer's molecular structure and intermolecular forces provide reinforcement to the film. The specific composition ratios create a synergistic effect where the inorganic filler and organic polymer work together to maintain film strength while reducing overall resin consumption
3Quantity of substance
If inorganic compound is added to ensure moldability, then resin usage is reduced, but bag-making processability deteriorates
Solution Approach 1:
The invention modifies the resin composition parameters by incorporating ethylene-vinyl alcohol copolymer with specifically controlled vinyl alcohol content (30-80 mass%) and copolymerization ratio (20-70 mass%). These parameter changes enhance the film's thermal and mechanical properties, enabling good heat sealing and bag-making processability even with 20-60 mass% inorganic compound addition, thus reducing resin usage while maintaining operational ease
Solution Approach 2:
The invention develops a composite material comprising inorganic compound (calcium carbonate), ethylene-vinyl alcohol copolymer, and polyethylene. The copolymer component provides heat-resistant properties that compensate for the heat sealing deficiencies caused by inorganic fillers, creating a synergistic composite that achieves both reduced resin usage and preserved bag-making processability
Data Source
AI summary
An object of the present invention is to provide a polyethylene-based resin composition from which a film can be obtained which has excellent moldability even in a case where an inorganic compound is added, and has excellent bag-making processability and film strength; and a polyethylene-based resin packaging material formed of the polyethylene-based resin composition. In a polyethylene-based resin composition containing an inorganic compound and an ethylene-α-olefin copolymer, the amount of a resin component is 25% by mass or more and less than 90% by mass, a proportion of the ethylene-α-olefin copolymer in the resin component is 50% by mass or more, and a proportion of an ethylene-α-olefin copolymer A polymerized with a metallocene-based catalyst in the ethylene-α-olefin copolymer is 10% by mass or more.