Tackifier-Free Polyolefin Adhesive for Absorbent Articles
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Solution Overview
Problem
Existing hot-melt adhesives used in disposable absorbent articles, such as diapers, often rely on costly tackifiers and have performance limitations, necessitating the development of more efficient and cost-effective construction adhesives.
Innovation Solution
The use of an adhesive comprising an amorphous polyolefin composition and a heterophase polyolefin composition, which are applied as a substantially tackifier-free formulation, providing improved bonding properties and reduced material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If tackifiers are used in hot-melt adhesive formulations, then bonding performance is improved, but material cost increases and formulation complexity increases
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by using amorphous polyolefin resins with specific molecular weight ranges (Mw/Mn ratio of 1.05 to 2.0) and controlled crystallinity (5-30% crystalline content). This parameter optimization allows the adhesive to achieve adequate bonding performance without requiring tackifiers, as the amorphous resin provides sufficient adhesion through its molecular structure and glass transition properties.
Solution Approach 2:
The patent extracts and eliminates the tackifier component from the traditional hot-melt adhesive formulation. By removing the tackifier (which would normally comprise 10-50 parts by weight per 100 parts resin), the formulation achieves cost reduction and simplified processing while maintaining bonding performance through the optimized amorphous polyolefin resin itself.
2Strength
If tackifiers are used in hot-melt adhesive formulations, then bonding performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs cost-effective amorphous polyolefin resins that can be produced through standard polymerization processes without requiring expensive tackifier additives. The resin formulation uses common polyolefin materials with optimized molecular weight distributions, replacing costly specialized tackifier compounds, thereby reducing manufacturing costs while maintaining acceptable bonding performance for disposable absorbent articles.
3Ease of manufacture
If conventional hot-melt adhesives are used, then assembly process is simple, but adhesive performance properties are limited
Solution Approach 1:
The patent creates a composite adhesive system combining amorphous polyolefin resin with specific plasticizer and wax components in optimized ratios. The amorphous resin provides adhesion, while the plasticizer (1-10 parts per 100 parts resin) and wax (5-30 parts per 100 parts resin) components enhance processability and bonding characteristics. This composite formulation achieves both simple assembly and improved performance.
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
This solution results in a hot-melt adhesive with enhanced bonding capabilities and lower density, leading to cost savings and improved performance in constructing disposable absorbent articles, while avoiding the drawbacks of conventional tackifier-based adhesives.
Implementation Method 1
a hot-melt adhesive is used as a construction adhesive. Common hot-melt adhesives are made by combining polymer and additive components in a substantially uniform thermoplastic blend
Data Source
AI summary
Disposable absorbent articles assembled from a collection of components using an adhesive having an amorphous polyolefin composition with a random butane-α-olefin copolymer and a heterophase polyolefin copolymer composition with a first set of comonomer units and a second set of comonomer units, wherein the first set of comonomer units are propene.