Hot Melt Adhesive Composition for Wide Temperature Bonding
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Solution Overview
Problem
Hot melt adhesives used in packaging applications often fail to form strong bonds that withstand a wide temperature range, particularly from -28.9°C to 65.6°C, leading to fiber failure issues.
Innovation Solution
A hot melt adhesive composition comprising at least 55% by weight of a non-functionalized amorphous poly alpha olefin polymer with greater than 50% polypropylene, combined with a metallocene-catalyzed second polymer and functionalized/polyethylene waxes, which provides a viscosity of no greater than 2000 centipoise at 176.7°C and exhibits high fiber tear resistance across various temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hot melt adhesives are used, then the adhesive can be applied and bonded substrates together, but the bond strength fails to withstand wide temperature ranges from -28.9°C to 65.6°C, resulting in fiber failure
Solution Approach 1:
The patent employs a composite adhesive formulation consisting of polypropylene homopolymer, polypropylene copolymer, and polyethylene wax in specific weight ratios. This composite material combines the properties of different polymers to achieve both bond strength and temperature resistance, resolving the contradiction between reliability and adaptability across temperature ranges
Solution Approach 2:
The patent optimizes the viscosity parameter of the adhesive composition by controlling the molecular weight and composition ratios of the polymer components. By adjusting these parameters, the adhesive maintains optimal flow characteristics at application temperature while forming strong, temperature-resistant bonds after cooling
2Ease of operation
If the adhesive viscosity is reduced to improve application, then the adhesive may not form strong enough bonds, but the patent achieves both low viscosity for application and high bond strength through specific polymer composition
Solution Approach 1:
The patent controls the viscosity parameter by selecting specific polypropylene homopolymer and copolymer combinations with appropriate molecular weights and comonomer contents. This parameter optimization enables the adhesive to have low viscosity at application temperature for easy application, while maintaining high bond strength after cooling and solidification
Data Source
AI summary
A hot melt adhesive composition that includes a non functionalized amorphous poly alpha olefin polymer, a second polymer selected from the group including polypropylene homopolymers, polypropylene copolymers and combinations there of, a functionalized wax and a second wax.