Polypropylene Film Resin Composition for Low-Temperature Adhesion
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Solution Overview
Problem
Conventional polypropylene-based films face challenges in achieving high adhesiveness at low temperatures and preventing whitening during fabrication processes, such as drawing and folding, which are essential for food packaging, construction/industrial materials, and secondary battery components like lithium ion batteries.
Innovation Solution
A resin composition comprising specific ratios of propylene-based polymers, polyolefins with unsaturated carboxylic acid derivatives, and ethylene-based polymers, optimized for melting points, melt flow rates, and molecular structures to enhance adhesiveness and prevent whitening, is developed. This composition is used in monolayer or multilayer films, including layers with metal-containing or polar resin layers, to improve bonding and processing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polypropylene is used as a thermoplastic forming material, then high rigidity and heat resistance are achieved, but poor adhesiveness to metallic and polar materials occurs
Solution Approach 1:
The patent modifies the chemical parameters of polypropylene by introducing grafted unsaturated carboxylic acid groups, changing its surface properties and polarity to improve adhesiveness while maintaining the base polypropylene structure for rigidity
Solution Approach 2:
The invention creates a composite material system by combining polypropylene with soft rubber components and unsaturated carboxylic acid derivatives, forming a multi-component adhesive resin that integrates rigidity, flexibility, and adhesiveness
2Temperature
If polypropylene is used as a thermoplastic forming material, then heat resistance is achieved, but poor flexibility occurs
Solution Approach 1:
The patent combines polypropylene with soft rubber components to create a composite adhesive resin that integrates the heat resistance of polypropylene with the flexibility of rubber, achieving both properties simultaneously
Solution Approach 2:
The invention introduces soft rubber components specifically to modify the flexibility characteristics of polypropylene, creating localized flexible regions within the otherwise rigid polypropylene matrix
3Ease of manufacture
If conventional polypropylene-based films are used, then processing is simplified, but whitening occurs during fabrication such as drawing and folding
Solution Approach 1:
The patent modifies the molecular structure and composition parameters of the polypropylene-based adhesive resin by incorporating unsaturated carboxylic acid derivatives and soft rubber components, changing the material's properties to prevent whitening during deformation while maintaining ease of processing
4Reliability
If adhesive properties are improved by compounding soft rubber component to polypropylene, then adhesiveness is enhanced, but the complexity of the resin composition increases
Solution Approach 1:
The patent optimizes the compositional parameters by defining specific content ranges for each component (polypropylene: 70-95 parts, soft rubber: 5-30 parts, unsaturated carboxylic acid derivative: 0.1-10 parts), simplifying the formulation process while achieving enhanced adhesiveness
Data Source
AI summary
A resin composition, wherein the content of a propylene-based polymer (A) satisfying a predetermined requirement is 10 to 99.9 parts by mass, the content of a propylene-based polymer (B) satisfying a predetermined requirement is 0 to 40 parts by mass, the content of a polyolefin (C) containing structural units derived from an unsaturated carboxylic acid and/or a derivative thereof is 0.1 to 20 parts by mass, and the content of an ethylene-based polymer (D) satisfying a predetermined requirement is 0 to 40 parts by mass, provided that the total content of components (A), (B), (C) and (D) is 100 parts by mass.