MAH-Grafted LLDPE Composition for High Melt Index Adhesion
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Solution Overview
Problem
Existing maleic anhydride grafted linear low-density polyethylenes (LLDPEs) exhibit low melt index and limited adhesion over a wide temperature range, which hinders their effectiveness in adhesive applications.
Innovation Solution
Development of LLDPEs grafted with maleic anhydride (MAH-g-LLDPE) with a melt index of 250 to 800 g/10 minutes and 0.01 to 3 weight percent maleic anhydride content, produced through a process involving melting and extrusion without a free radical initiator, enhancing adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional maleic anhydride grafted LLDPE is produced using existing methods, then the polymer can be manufactured, but the melt index remains low (below 37 g/10 min) and adhesion is limited over temperature range
Solution Approach 1:
The patent applies parameter changes by modifying the grafting conditions, specifically using a maleic anhydride concentration of 0.01 to 3 weight percent and controlling the extrusion temperature and residence time to achieve a melt index of 250 to 800 g/10 minutes while maintaining adhesion properties over a wide temperature range
Solution Approach 2:
The patent creates a composite material system by grafting maleic anhydride onto LLDPE to produce MAH-g-LLDPE with specific properties (0.01 to 3 wt% maleic anhydride content, melt index 250-800 g/10 min), which combines the benefits of improved processability with enhanced adhesion performance
2Reliability
If the maleic anhydride content is increased to improve adhesion, then bonding performance improves, but the melt index may become unmanageably high affecting processing
Solution Approach 1:
The patent optimizes the maleic anhydride content parameter to a specific range of 0.01 to 3 weight percent, which provides sufficient adhesion improvement while maintaining the melt index within the controllable range of 250 to 800 g/10 minutes, balancing performance and processability
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 MAH-g-LLDPE demonstrates improved adhesion to various surfaces and enhances the properties of hot melt adhesives over a wide temperature range, offering better cohesive strength and bonding performance.
Implementation Method 1
contacting the molten LLDPE with the maleic anhydride in the extruder at conditions effective to increase the melt index (MI) of the LLDPE and to form the MAH-g-LLDPE
Implementation Method 2
melting a LLDPE in an extruder to form a molten LLDPE
Data Source
AI summary
Disclosed is a linear low-density polyethylene grafted with maleic anhydride (MAH-g-LLDPE). The MAH-g-LLDPE has a unique combination of properties including a low density and a high melt index.