Adhesive Resin Composition for Polymethylpentene Bonding
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Solution Overview
Problem
It is difficult to bond a nonpolar low-wettability polymethylpentene resin with polar resins such as ethylene-vinyl alcohol copolymer or polyamide resins, and the bond strength is significantly reduced by stretching or retort treatment, as well as when bonding with other resins like polyketone or polycarbonate.
Innovation Solution
An adhesive resin composition comprising a propylene polymer, an ethylene polymer, and a thermoplastic resin copolymer with specific molecular structures and melting points, along with a carbodiimide-modified polyolefin, which forms a laminate with an adhesive layer that maintains good adhesion between polymethylpentene and other resins even after stretching or treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesive methods are used to bond polymethylpentene resin with polar resins, then bonding is attempted, but the bond strength is significantly reduced by stretching or retort treatment
Solution Approach 1:
The patent introduces a specific adhesive resin composition as an intermediary layer between the polymethylpentene resin and polar resins. This adhesive layer contains a copolymer with 4-methyl-1-pentene and C2-C20 α-olefin units, along with unsaturated carboxylic acid-modified polyolefin and organic peroxide, which mediates the bonding interface and maintains adhesion stability after stretching or retort treatment.
Solution Approach 2:
The patent optimizes specific parameters of the adhesive resin composition, including the copolymer composition (4-methyl-1-pentene content ≥60 mol%), the type of unsaturated carboxylic acid modification, and the organic peroxide content. These parameter changes enable the adhesive to maintain bond strength under stretching and retort conditions where conventional adhesives fail.
2Strength
If polymethylpentene resin is bonded with polar resins or other resins using conventional methods, then bonding is achieved, but the adhesion is significantly lowered by stretching or retort treatment
Solution Approach 1:
The adhesive resin composition acts as a protective intermediary layer that shields the bond interface from the harmful effects of stretching and retort treatment. The specific copolymer structure and modification components absorb or distribute the stress and chemical effects, preventing adhesion failure.
Solution Approach 2:
The adhesive resin composition is designed with preemptive protective features, including the organic peroxide and unsaturated carboxylic acid-modified polyolefin, which create a resilient bonding interface before stretching or retort treatment occurs. This beforehand cushioning prevents the significant adhesion loss that would otherwise occur.
3Strength
If simple adhesive compositions are used, then the composition is easy to manufacture, but the adhesion between polymethylpentene and polar resins is insufficient
Solution Approach 1:
The patent employs a composite adhesive resin composition that combines a copolymer with 4-methyl-1-pentene and C2-C20 α-olefin, unsaturated carboxylic acid-modified polyolefin, and organic peroxide. This composite structure provides synergistic effects that achieve strong adhesion between polymethylpentene and polar resins while maintaining manufacturability through a defined multi-component system.
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 adhesive resin composition effectively bonds polymethylpentene with polar or polyolefin resins, maintaining strong adhesion after stretching or other treatments, and also bonds well with polyketone or polycarbonate, ensuring robust interlayer adhesion in laminates.
Implementation Method 1
a carbodiimide-modified polyolefin
Data Source
AI summary
An adhesive resin composition including a propylene polymer (A), an ethylene polymer (B), and a thermoplastic resin (C) including a copolymer containing not less than 60 mol % and not more than 99 mol % of structural units derived from 4-methyl-1-pentene, and not less than 1 mol % and not more than 40 mol % of structural units derived from a C2-C20 α-olefin other than 4-methyl-1-pentene, these structural units representing total 100 mol % of the copolymer, the thermoplastic resin (C) showing a melting point Tm of not more than 199° C. or showing substantially no melting point as analyzed with a differential scanning calorimeter (DSC). The total of the components (A), (B) and (C) includes 45 to 75 parts by mass of the component (A), 5 to 20 parts by mass of the component (B), and 15 to 45 parts by mass of the component (C).