Propylene-Based Hot-Melt Adhesive Composition for High-Speed Processing
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Solution Overview
Problem
Conventional hot-melt adhesive (HMA) formulations face challenges with reduced tackifier content leading to deteriorated adhesion and increased set time, particularly when using propylene-based copolymers, which are not suitable for high-speed line processing due to slow crystallization times and limited high-temperature resistance.
Innovation Solution
A composition comprising a carboxylic-functionalized ethylene/α-olefin interpolymer and a propylene-based interpolymer, with specific density and melt viscosity ranges, to achieve improved adhesion, thermal stability, and rapid set time, while maintaining a high polymer content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount of tackifier is reduced and polymer content is increased in HMA formulation, then adhesion performance deteriorates and set time increases
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific propylene-based interpolymer with defined density (0.870-0.890 g/cc) and melt viscosity (<50,000 mPa.s at 177°C) properties, replacing traditional EVA and ethylene-based copolymers to achieve both reduced tackifier content and acceptable set time
Solution Approach 2:
The patent creates a composite adhesive system combining propylene-based interpolymer (45-90 wt%), carboxylic-functionalized ethylene/α-olefin interpolymer (1-10 wt%), and reduced tackifier (10-40 wt%), where the synergistic interaction between components achieves both high polymer content and adequate adhesion performance
2Quantity of substance
If propylene-based copolymer is used to increase polymer content, then adhesion performance improves, but set time becomes slower due to slow crystallization
Solution Approach 1:
The patent modifies the propylene-based interpolymer parameters (density 0.870-0.890 g/cc, melt viscosity <50,000 mPa.s at 177°C) to optimize the balance between crystallization rate and adhesion performance, enabling high polymer content while maintaining acceptable set time for high-speed processing
3Loss of time
If traditional polymers such as EVA and ethylene-based copolymers are used, then set time is rapid, but adhesion performance deteriorates when tackifier content is reduced
Solution Approach 1:
The patent develops a composite formulation where propylene-based interpolymer (45-90 wt%) provides adhesion strength, carboxylic-functionalized ethylene/α-olefin interpolymer (1-10 wt%) enhances interfacial bonding, and reduced tackifier (10-40 wt%) maintains cohesive strength, achieving both good adhesion and acceptable set time
Data Source
AI summary
The present disclosure provides a composition. In an embodiment a composition is provided and includes: (A) a carboxylic-functionalized ethylene/a-olefin interpolymer having (i) a density from 0.855 g/cc to 0.895 g/cc; and (ii) a melt viscosity, at 177°C, less than, or equal to, 50,000 mPa.s; and (B) a propylene-based interpolymer having (i) a density from 0.870 g/cc to 0.890 g/cc; and (ii) a melt viscosity, at 177°C, less than, or equal to, 50,000 mPa.s.