Block Copolymer Tie Layer for Polyolefin Packaging Laminate Toughness
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Solution Overview
Problem
Flexible polyolefin films lack sufficient toughness and interlayer adhesion, making them unsuitable replacements for flexible PVC films, which raises concerns about safety and durability, especially in packaging applications.
Innovation Solution
A flexible packaging laminate film is developed with at least two polyolefin layers tied together by a selectively hydrogenated high vinyl block copolymer layer, enhancing interlayer adhesion and toughness without compromising the environmental safety and optical properties of polyolefin films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polyolefin films are used as flexible packaging material, then environmental safety is improved, but toughness is worsened
Solution Approach 1:
The patent creates a multilayer composite film structure where polyolefin layers (providing environmental safety) are combined with a block copolymer layer (providing toughness). The block copolymer layer acts as a tie layer bonding the polyolefin layers together, achieving both environmental safety and improved toughness in a single composite material system.
2Strength
If multilayer polyolefin films are laminated to increase toughness, then toughness is improved, but interlayer adhesion is worsened
Solution Approach 1:
The block copolymer layer serves as an intermediary tie layer between polyolefin layers. It has compatibility with polyolefin and provides strong bonding, acting as a mediator that transfers stress between layers and prevents delamination, thereby improving both toughness and interlayer adhesion simultaneously.
3Strength
If multilayer polyolefin films are laminated to increase toughness, then toughness is improved, but optical properties are worsened
Solution Approach 1:
The block copolymer tie layer is designed with specific local properties: it is formulated to be thin (0.5-2.0 mils) and optically compatible with the polyolefin layers. This localized optimization allows the tie layer to provide toughness enhancement while minimizing its impact on overall optical properties like clarity and haze.
4Strength
If flexible PVC film is used to achieve toughness, then toughness is improved, but safety is worsened
Solution Approach 1:
The patent replaces flexible PVC with a composite structure of polyolefin layers bonded by a block copolymer tie layer. This composite achieves comparable or superior toughness to PVC while eliminating the safety concerns associated with vinyl chloride, as polyolefin and the specific block copolymer used are food-safe materials.
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 film exhibits improved interlayer adhesion and toughness, reducing delamination and enhancing puncture resistance and optical clarity, making it a safer and more durable alternative to traditional polyolefin films for packaging applications.
Implementation Method 1
a flexible packaging laminate film having improved interlayer adhesion and toughness that comprises at least two polyolefin layers tied together with at least one block copolymer layer
Data Source
AI summary
What is claimed is a flexible packaging film having improved toughness without compromise of other physical properties. The flexible packaging film is a laminate of at least two film layers of a polyolefin and at least one film layer of a block copolymer. The block copolymer employed in the present invention is a selectively hydrogenated high vinyl block copolymer.