Resin Composition for Uniform Low-Temperature Melting
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Solution Overview
Problem
Melt bags formed from existing materials cannot be uniformly molten at below melting operation temperatures, leading to unmelted residues in final products, poor storage stability, and inadequate mechanical properties.
Innovation Solution
A resin composition comprising a propylene/C2-20 α-olefin copolymer and an ethylene/C3-20 α-olefin copolymer with specific molecular weight distributions and melting point characteristics, ensuring uniform melting at low temperatures and improved storage stability and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional melt bag materials (ethylene/acrylate copolymer, ethylene/methacrylate copolymer, ethylene/vinyl acetate copolymer) are used, then the melt bags can be formed and packaged, but they cannot be molten uniformly at below melting operation temperatures and remain unmolten in final products
Solution Approach 1:
The patent changes the chemical composition parameters of the melt bag material by using a specific copolymer system (polyethylene/C3-20 α-olefin copolymer with 5-49 mol% α-olefin content) that has optimized melting characteristics. This parameter change enables uniform melting at below melting operation temperatures while preventing unmelted residues in final products.
Solution Approach 2:
The patent employs a composite material approach by formulating a specific copolymer system combining polyethylene with C3-20 α-olefin units. This composite molecular structure provides both the formability needed for packaging and the melting uniformity required for complete dissolution in final products, resolving the contradiction between reliability of melting and ease of manufacture.
2Reliability
If conventional melt bag materials are used, then packaging can be produced, but storage stability is unsatisfactory
Solution Approach 1:
The patent modifies the chemical composition parameters by selecting a specific copolymer system (polyethylene/C3-20 α-olefin copolymer with controlled α-olefin content of 5-49 mol%) that provides enhanced storage stability. This parameter optimization prevents degradation and maintains material properties during storage while ensuring complete melting in final products.
3Strength
If conventional melt bag materials are used, then packages can be formed, but mechanical properties are inadequate
Solution Approach 1:
The patent utilizes a composite material strategy by employing a specific copolymer architecture (polyethylene/C3-20 α-olefin copolymer) that combines the formability needed for package formation with the mechanical strength required for adequate performance. The controlled α-olefin content (5-49 mol%) creates a composite structure that balances processability and final product mechanical properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resin composition allows for uniform melting at temperatures lower than typical melting points, preventing unmelted residues and enhancing storage stability and mechanical properties of melt bags, making them suitable for packaging applications.
Implementation Method 1
a propylene/C2-20 α-olefin (except propylene) copolymer (A) having (1) a melting point (Tm) of not more than 90° C. as measured by differential scanning calorimetry (DSC) or not showing a melting point peak in DSC, and an ethylene/C3-20 α-olefin copolymer (B) having (1) a melting point (Tm) of not more than 90° C. as measured by differential scanning calorimetry (DSC) or not showing a melting point peak in DSC
Data Source
AI summary
Melt bags of the invention are molten uniformly at temperatures lower than melting operation temperatures in the product manufacturing and do not remain unmolten in the final products. The melt bags have high storage stability and excellent mechanical properties. Resin compositions of the invention are suited to give such melt bags.A resin composition of the invention includes a propylene/C2-20 α-olefin (except propylene) copolymer (A) having (1) a melting point (Tm) of not more than 90° C. as measured by differential scanning calorimetry (DSC) or not showing a melting point peak in DSC, and an ethylene/C3-20 α-olefin copolymer (B) having (1) a melting point (Tm) of not more than 90° C. as measured by differential scanning calorimetry (DSC) or not showing a melting point peak in DSC, the weight ratio of these copolymers (A)/(B) being in the range of 99/1 to 1/99.