Plasticized Polyolefin Adhesives via In-Situ Polymerization
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Solution Overview
Problem
Current methods for producing plasticized polyolefins, such as those used in hot melt adhesives, require solvent removal steps that are energy-intensive, costly, and environmentally unfriendly, and struggle with incorporating low-density or low-molecular-weight polymers that are difficult to pelletize or extrude.
Innovation Solution
Polymerizing polymerizable monomers in a plasticizer, like mineral oil, in the presence of a catalyst system to form plasticized polymers, eliminating the need for solvent removal and allowing for the use of challenging polymers in adhesive formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional solvent-based polymerization is used, then polymers can be produced, but solvent removal steps are required which are energy-intensive and costly
Solution Approach 1:
The patent changes the fundamental parameter of the polymerization medium from conventional volatile solvents to non-volatile plasticizers. This parameter change eliminates the need for solvent removal steps, thereby reducing energy consumption while maintaining polymer production capability. The plasticizer remains in the final product as a functional component rather than being removed as waste.
Solution Approach 2:
The patent extracts the harmful function of solvents (requiring removal) and replaces it with plasticizers that serve both as polymerization medium and final product component. This eliminates the solvent removal step and its associated energy costs while maintaining the polymerization process.
2Adaptability or versatility
If low density or low molecular weight polyolefin materials are used, then adhesive properties are improved, but the materials are difficult to pelletize and extrude
Solution Approach 1:
The patent uses plasticizer as an intermediary medium during polymerization that prevents the low density/low molecular weight polyolefins from fouling reactors and facilitates their incorporation into adhesive formulations. The plasticizer acts as a carrier that enables handling of materials that would otherwise be difficult to process.
Solution Approach 2:
The patent changes the physical state and processing parameters by maintaining the polymer in a plasticized state throughout the process. This allows low density/low molecular weight materials to be used without requiring traditional pelletization and extrusion steps, as the plasticizer keeps the material in a workable state.
3Productivity
If conventional polymerization processes are used, then polymers can be produced, but expensive equipment is required to strip and recycle solvent carriers
Solution Approach 1:
The patent extracts and eliminates the solvent carrier stripping and recycling equipment from the process by replacing solvents with plasticizers. This simplifies the equipment requirements while maintaining polymer production capability, removing the need for expensive solvent recovery systems.
Solution Approach 2:
The patent changes the volatility parameter of the polymerization medium from high (solvents requiring stripping) to low (plasticizers that remain in product). This parameter change eliminates the need for complex stripping and recycling equipment while maintaining productive polymer synthesis.
4Manufacturing precision
If solvent removal steps are implemented, then polymer purity is improved, but water and energy usage increase
Solution Approach 1:
The patent changes the volatility parameter of the polymerization medium from high (solvents requiring removal) to low (plasticizers remaining in product). This eliminates the need for energy-intensive and water-consuming removal steps while maintaining adequate polymer purity for adhesive applications.
Solution Approach 2:
The patent converts what would traditionally be considered a contaminant (the polymerization medium) into a beneficial functional component (plasticizer in final adhesive product). This eliminates the need for removal steps that consume energy and water, while actually improving the final product properties.
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 approach reduces energy and water consumption, enables the use of previously difficult-to-formulate polymers, and results in improved adhesive properties with enhanced tensile strength and peel adhesion.
Implementation Method 1
polymerizing a polymerizable monomer in a plasticizer and in the presence of a catalyst system for a time and temperature sufficient to form the plasticized polymer
Data Source
AI summary
A method for making a plasticized polymer comprises polymerizing a polymerizable monomer, such as an ethylenically unsaturated monomer, in a plasticizer, such as mineral oil, and in the presence of a catalyst system. The plasticized polymer may be mixed with a tackifying resin in a method for making an adhesive. A composition, which may be useful as an adhesive, comprises a polymer system comprising a first polymer; a plasticized system comprising a first plasticizer that was in the presence of the first polymer during the polymerization step to make the first polymer; and a tackifier. The method can be used to make compositions having polymers with a low density or a low molecular weight or both. The final compositions made by methods of the invention include adhesives, sealants, coating, or lubricants.