Meltable Acrylate Adhesive Layers for Resealable Packaging
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Solution Overview
Problem
Existing pressure-sensitive adhesives for resealable packaging often fail to meet requirements for strong adhesive effect after repeated use, are prone to high opening forces, and can emit odors, necessitating additional barrier layers that increase production costs and complexity.
Innovation Solution
Acrylate polymers with specific monomer compositions and photoinitiators are used to create odor-free pressure-sensitive adhesive layers that maintain adhesive strength and resealability without the need for barrier layers, ensuring reliable closure and low odor emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional pressure-sensitive adhesives (e.g., styrene-butadiene block copolymers) are used, then adhesive strength is achieved, but barrier layers are required to prevent migration of plasticizers and tackifiers, increasing production costs and complexity
Solution Approach 1:
The invention extracts and eliminates the harmful components (plasticizers and tackifiers) from the adhesive system by using a photopolymerizable adhesive composition based on acrylate or vinyl silane monomers that cures to form a crosslinked network, thereby preventing migration without requiring barrier layers
Solution Approach 2:
The invention changes the chemical composition and curing mechanism of the adhesive from conventional non-crosslinked block copolymers to photopolymerizable acrylate or vinyl silane systems that form crosslinked structures upon UV irradiation, fundamentally altering the adhesive's molecular structure to prevent component migration
2Strength
If conventional pressure-sensitive adhesives are used, then initial adhesion is achieved, but adhesive effect decreases significantly after repeated opening and closing
Solution Approach 1:
The invention applies preliminary action by curing the adhesive composition with UV irradiation before the packaging is put into service, pre-forming the crosslinked network structure that provides durable adhesive performance from the first use and maintains it through repeated opening and closing cycles
Solution Approach 2:
The invention uses a composite adhesive system combining photopolymerizable monomers (acrylate or vinyl silane) with specific functional additives, creating a crosslinked composite material that exhibits superior durability and resistance to degradation compared to conventional linear polymer adhesives
3Strength
If pressure-sensitive adhesives containing vinyl acetate or block copolymers are used, then adhesive properties are achieved, but odor emissions occur
Solution Approach 1:
The invention converts the potential harm of using simple monomer systems (which might lack sufficient adhesion) into a benefit by incorporating photopolymerizable acrylate or vinyl silane monomers that, when crosslinked, provide both strong adhesive properties and complete freedom from odor, eliminating the need for vinyl acetate or block copolymers that generate odors
4Object-affected harmful factors
If barrier layers are added to prevent adhesive component migration, then safety is improved, but production effort and costs increase
Solution Approach 1:
The invention extracts and eliminates the need for barrier layers by designing an adhesive composition based on photopolymerizable acrylate or vinyl silane monomers that cures to a crosslinked structure, inherently preventing migration of components without requiring additional barrier layers
Solution Approach 2:
The invention merges the adhesive function with the safety function by creating a single-phase photopolymerizable adhesive composition that simultaneously provides adhesion and prevents component migration through its crosslinked structure, eliminating the need for separate barrier layers
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 acrylate polymer-based adhesive layers provide consistent resealability and low odor, maintaining adhesive strength after multiple openings and closures, and do not require additional barrier layers, thus simplifying production and reducing costs.
Implementation Method 1
acrylate polymers with a glass transition temperature below -20 °C, determined according to ASTM-D 3418/82, which contain 1 to 30 mmol of polymerized photoinitiator per kg of acrylate polymer
Implementation Method 2
acrylate polymers with a glass transition temperature below -20 °C
Data Source
AI summary
The present invention relates to the use of meltable acrylate polymers for producing contact adhesive layers in resealable packagings. Moreover, the invention relates to multiple-layer films which have a contact adhesive layer on the basis of meltable acrylate polymers, to a method for producing said multiple-layer films, and to the use of said multiple-layer films for producing resealable packagings.