Hot Melt Adhesive Composition for Paper Substrates
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Solution Overview
Problem
Current hot melt adhesives used in paper processing and packaging, particularly for corrugated cardboards and cartons, face challenges with stringing, thermal stability, and adhesion to chemically coated surfaces, which are not adequately addressed by existing solutions.
Innovation Solution
A hot melt adhesive composition comprising an olefin-based polymer, a butyral resin, a fatty acid or its derivative, a tackifier resin, and optionally a wax, which improves thermal stability, adhesion to paper and polyolefin substrates, and reduces stringing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional hot melt adhesives are used for paper processing, then adhesion to paper substrates is achieved, but stringing occurs during application
Solution Approach 1:
The patent modifies the chemical composition parameters of the hot melt adhesive by incorporating specific ratios of EVA copolymer (10-40 parts), polyolefin resin (30-60 parts), and polyalphaolefin resin (10-40 parts), along with fatty acid (1-10 parts) and tackifier resin (5-20 parts). This parameter optimization reduces stringing while maintaining adhesion performance.
Solution Approach 2:
The patent creates a composite hot melt adhesive system combining multiple polymer components (EVA, polyolefin, polyalphaolefin) with functional additives (fatty acid, tackifier resin). This composite formulation achieves both reduced stringing and reliable adhesion to paper substrates.
2Strength
If hot melt adhesive is heated to high temperature for application, then adhesion is improved, but thermal stability deteriorates
Solution Approach 1:
The patent optimizes the molecular weight distribution and composition ratios of the polymer components to achieve optimal adhesion strength at application temperatures (120-190°C) while maintaining thermal stability during storage and processing.
Solution Approach 2:
The use of polyolefin and polyalphaolefin resins provides thermal stability without requiring complex stabilizers, as these polymers inherently resist thermal degradation at typical hot melt application temperatures.
3Reliability
If hot melt adhesive is applied to chemically coated surfaces, then adhesion to coated cartons is required, but adhesion performance deteriorates
Solution Approach 1:
The fatty acid component acts as an intermediary substance that enhances wetting and adhesion to chemically coated surfaces by reducing surface tension and improving contact between the adhesive and the coated substrate.
Solution Approach 2:
The tackifier resin content (5-20 parts) is optimized to provide sufficient adhesion to challenging coated surfaces while the overall composition balance ensures compatibility with various substrate types including coated cartons.
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 adhesive exhibits high thermal stability, strong adhesion to paper and polyolefin substrates, and reduced stringing, making it suitable for applications on corrugated cardboards and cartons, including those with chemical coatings.
Implementation Method 1
A hot melt adhesive is a solvent-less adhesive, which is heat-melted, applied to an adherend, and then solidified by cooling to exhibit adhesion
Implementation Method 2
a hot melt adhesive having less stringing... having excellent adhesion to paper, furthermore, to cartons the surface of which is coated with a chemical
Data Source
AI summary
The object of the present invention is to provide a hot melt adhesive which is less likely to cause stringing, and has excellent thermal stability and adhesion, in particular adhesion to a paper material. The present invention relates to a hot melt adhesive comprising: (A) an olefin-based polymer, (B) a butyral resin, (C) at least one selected from the group consisting of a fatty acid and a derivative thereof, and (D) a tackifier resin.