Barrier Laminate with Cyclic Olefin Intermediate Layer
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Solution Overview
Problem
Current barrier laminates using cyclic olefin copolymers for packaging materials face challenges in effectively suppressing the elution of adhesive components while maintaining sufficient sealing strength, leading to potential health risks and non-compliance with regulatory standards, and are often costly and environmentally unfriendly due to excessive thickness.
Innovation Solution
A multilayer film configuration with a substrate, an adhesive layer, and a sealant film, where the sealant film includes a specific cyclic olefinic resin layer with a glass transition temperature between 70°C to 160°C, and an olefinic resin layer without a cyclic structure, optimized for thickness ratios and resin compositions to enhance barrier properties and sealing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a cyclic olefin copolymer sealant film is used to suppress adhesive elution, then the barrier properties improve, but the sealing strength becomes insufficient
Solution Approach 1:
The sealant film is divided into multiple functional layers: a barrier layer containing cyclic olefin copolymer to suppress adhesive elution, and a sealing layer with different polymer composition to provide adequate sealing strength. This segmentation allows each layer to perform its specific function optimally without compromising the other.
Solution Approach 2:
The sealant film uses a composite structure combining cyclic olefin copolymer (for barrier properties) with other polymer materials (for sealing strength). This composite approach enables the film to simultaneously achieve low adhesive elution and sufficient sealing performance that neither material could provide alone.
2Object-affected harmful factors
If the cyclic olefin copolymer layer thickness is increased to improve barrier properties, then the suppression of substance migration improves, but the total thickness and cost increase
Solution Approach 1:
The barrier function is concentrated in a specific localized layer containing cyclic olefin copolymer, while other layers have different compositions optimized for their specific functions. This allows effective barrier properties to be achieved with minimal thickness of the barrier layer, rather than increasing the thickness of the entire sealant film.
Solution Approach 2:
Instead of using excessive thickness throughout the entire sealant film, the invention applies the barrier material (cyclic olefin copolymer) partially in a specific layer with optimized thickness just sufficient to achieve the required barrier performance, avoiding unnecessary material usage and cost.
3Object-affected harmful factors
If a multilayer sealant film is used to achieve both barrier properties and sealing strength, then the suppression of harmful factors improves, but the device complexity increases
Solution Approach 1:
The sealant film is segmented into distinct functional layers, each with specific polymer compositions tailored to their roles: barrier function, sealing function, and adhesive interface function. This segmentation provides a systematic approach to achieving multiple performance requirements while maintaining manufacturing feasibility.
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 solution effectively captures and suppresses the migration of harmful substances from the adhesive layer, ensuring proper sealing strength and environmental sustainability by reducing material thickness and costs, making it suitable for food and medical product packaging.
Implementation Method 1
a multilayer film including a layer formed by using a specific cyclic olefinic resin in the sealant film can effectively suppress elution of a component from the adhesive layer
Implementation Method 2
an intermediate layer (B) which includes 70% by mass or more of a cyclic olefinic resin (b1) having a glass transition temperature Tg of 70°C to 160°C
Implementation Method 3
a laminate layer (A) side of a multilayer film (I) with a substrate film (II) using an adhesive
Implementation Method 4
an olefinic resin (a1) not having a cyclic structure as a main component... an olefinic resin (c1) not having a cyclic structure as a main component... sealing properties can be satisfactory
Data Source
AI summary
Provided are a barrier laminate which is formed by laminating a sealant film and a substrate and can effectively suppress elution of adhesive components, which is a specific control subject, while keeping a sealing strength requisite for a general laminate packaging material; and a packaging material formed by using the same. Specifically, a barrier laminate is used, which is formed by laminating the surface of a laminate layer (A) side of a multilayer film with a substrate film using an adhesive, in which the multilayer film is formed by laminating the laminate layer (A) which includes an olefinic resin as a main component, an intermediate layer (B) which includes 70% by mass or more of a cyclic olefinic resin having a glass transition temperature Tg of 70°C to 160°C as a resin component, and a sealing layer (C) which includes an olefinic resin as a main component in the order of (A)/(B)/(C); and the total thickness of the multilayer film is 15 to 150 µm, the thickness ratio of the intermediate layer (B) is 0.5% to 10%, and the thickness of the sealing layer (C) is 3 µm or more.