Laminate Heat-Seal Layer for Gas Permeability and Peel Strength
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Solution Overview
Problem
Existing films with structural units derived from 4-methyl-1-pentene face a trade-off between gas permeability and heat sealability, as blending additional thermoplastic resins to improve heat sealability often decreases gas permeability.
Innovation Solution
A laminate structure is developed with a heat seal layer composed of a copolymer or modified product of 4-methyl-1-pentene and α-olefin, where the 4-methyl-1-pentene content is 50-99 mol% and α-olefin content is 1-50 mol%, ensuring an oxygen and carbon dioxide permeation coefficient of 1000 cm³·mm/(m²·24hr·atm) or more, and a peel strength of 2.0N/15mm or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermoplastic resin (B) is blended to improve heat sealability, then heat sealability is improved, but gas permeability is lowered
Solution Approach 1:
The invention divides the film into multiple layers: a base layer made of copolymer containing 4-methyl-1-pentene structural units (maintaining gas permeability) and a separate heat seal layer applied on top (providing heat sealability). This segmentation allows each layer to independently perform its specific function without compromising the other property.
Solution Approach 2:
The invention uses composite material structure by combining copolymer containing 4-methyl-1-pentene structural units with thermoplastic resin for heat sealing. The copolymer layer provides gas permeability while the thermoplastic resin layer provides heat sealability, creating a composite material that exhibits both properties simultaneously.
2Quantity of substance
If copolymer with high 4-methyl-1-pentene content is used to maintain gas permeability, then gas permeability is maintained, but heat sealability deteriorates
Solution Approach 1:
The invention divides the film into multiple layers: a base layer made of copolymer containing 4-methyl-1-pentene structural units (maintaining gas permeability) and a separate heat seal layer applied on top (providing heat sealability). This segmentation allows each layer to independently perform its specific function without compromising the other property.
Solution Approach 2:
The invention applies different material properties to different parts of the film structure. The base layer uses copolymer with high 4-methyl-1-pentene content for gas permeability, while the heat seal layer uses thermoplastic resin for heat sealability. Each local region of the film has optimized quality for its specific function.
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 laminate achieves excellent gas permeability and heat sealability, maintaining or improving both properties without the negative impact seen in previous technologies, suitable for packaging applications.
Implementation Method 1
the heat seal layer is a dried product of a coating composition... excellent heat sealability is achieved
Implementation Method 2
a film formed from a copolymer including a structural unit derived from the 4-methyl-1-pentene has excellent gas permeability... oxygen permeation coefficient of 1000 cm³[...]}
Implementation Method 3
a second step of dissolving the coating composition in an organic solvent to prepare a varnish
Implementation Method 4
a third step of applying the varnish to one surface of the substrate in the thickness direction and drying the varnish to dispose the heat seal layer
Data Source
Figure 1~2B
AI summary
A laminate (1) includes a substrate (2) and a heat seal layer (3). The heat seal layer (3) is a dried product of a coating composition. The coating composition contains a resin component consisting of a copolymer of 4-methyl-1-pentene and an α-olefin (except 4-methyl-1-pentene) and/or a modified copolymer of the copolymer. In the copolymer, the content ratio of a structural unit derived from the 4-methyl-1-pentene is 50 mol% or more and 99 mol% or less, and the content ratio of a structural unit derived from the α-olefin is 1 mol% or more and 50 mol% or less, with respect to the total amount of the structural unit derived from the 4-methyl-1-pentene and the structural unit derived from the α-olefin. Each of the oxygen permeation coefficient and the carbon dioxide permeation coefficient of the laminate is 1000cm3·mm/(m2·24hr·atm) or more.