Plant Oil Pressure Sensitive Adhesives Crosslinked for Thermal Stability
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Solution Overview
Problem
Current pressure sensitive adhesives (PSAs) based on plant oils face challenges such as long curing times, inferior properties like poor shear strength, tack, and peel strength, and limited thermal stability, making them unsuitable for commercial use in electronic devices and other applications.
Innovation Solution
Development of a composition comprising a polymer matrix with greater than 50% plant-based materials, using plant oil triglycerides as both carrier and tackifier, and incorporating dihydroxylated or epoxidized plant oil triglycerides to create a crosslinked polymer matrix with improved thermal stability and adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plant oil-based PSAs are used to replace petroleum-based materials, then environmental sustainability is improved, but thermal stability and adhesion properties deteriorate
Solution Approach 1:
The patent uses composite materials by combining plant oil triglycerides with specific functional additives and crosslinking agents to create a hybrid adhesive system that maintains the renewable nature of the base material while incorporating components that provide thermal stability and improved adhesion properties
Solution Approach 2:
The patent applies parameter changes by modifying the chemical structure of plant oil triglycerides through transesterification and crosslinking reactions, changing the molecular weight distribution, functional group composition, and crosslink density to achieve both sustainability and thermal stability simultaneously
2Reliability
If plant oil-based PSAs are used to replace petroleum-based materials, then environmental sustainability is improved, but adhesion properties (shear strength, tack, peel strength) deteriorate
Solution Approach 1:
The patent applies local quality by introducing specific functional groups at strategic locations within the adhesive matrix, such as adding silane crosslinking sites or metal chelating groups at the interface region, to enhance adhesion properties locally without compromising the overall renewable character of the material
Solution Approach 2:
The patent uses intermediary substances such as coupling agents or bridging molecules that facilitate strong bonding between the plant oil matrix and the substrate, acting as mediators that transfer and enhance adhesion forces while maintaining the bio-based nature of the system
3Reliability
If plant oil-based PSAs are used, then environmental sustainability is improved, but curing time increases
Solution Approach 1:
The patent applies preliminary action by pre-functionalizing the plant oil triglycerides with reactive groups during the synthesis stage, so that when the adhesive is applied, the crosslinking reaction can proceed immediately upon contact with moisture or activation, dramatically reducing the field curing time while maintaining the sustainable material basis
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 solution results in PSAs with enhanced thermal stability, peel strength, and shelf-life, suitable for use in flexible electronic devices and other applications, while being environmentally friendly and reducing reliance on petroleum-based materials.
Implementation Method 1
a polymer matrix comprising plant oil triglyceride polymers
Implementation Method 2
incorporating dihydroxylated or epoxidized plant oil triglycerides to create a crosslinked polymer matrix
Data Source
AI summary
Compositions useful for preparing pressure sensitive adhesives, coatings, and/or films are provided, along with methods of making and using the same. The compositions are made from renewable, plant-based materials. The compositions comprise plant oil triglycerides that are polymerized and crosslinked to yield polymer matrices. Plant-based carriers and/or tackifiers can be used in the invention, including epoxidized plant oil triglycerides, acrylated epoxidized plant oil triglycerides, and dihydroxylated plant oil triglycerides. Natural tackifiers such as rosin esters and terpenes can also be used in the compositions. Dihydroxylated plant oil triglyceride tackifiers for use in biobased and synthetic adhesives are also provided.