Biodegradable Polyester Adhesive Without Tackifiers or Isocyanates
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Solution Overview
Problem
Conventional polyester adhesives cause environmental pollution due to non-biodegradability, poor solubility, and tackiness issues, especially when using tackifiers, polyols, and isocyanates, which also hinder recycling.
Innovation Solution
A biodegradable polyester polymer is developed using a polymerizable composition comprising dicarboxylic acids, aliphatic glycols, and poly(neopentyl sebacate) oligomers, with optional polyfunctional compounds, to enhance solubility, storage stability, and tackiness without tackifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional polyester resins are used in adhesives, then the adhesive structure is stable, but the adhesive does not biodegrade and causes environmental pollution
Solution Approach 1:
The patent changes the chemical composition parameters of the polyester resin by using biodegradable monomers (dicarboxylic acids and diols) instead of conventional non-biodegradable ones. This parameter change enables the adhesive to biodegrade while maintaining structural stability during use, resolving the contradiction between stability and environmental harm.
2Strength
If tackifiers such as rosin esters and terpene phenols are added to improve tackiness, then the adhesive tackiness is improved, but the adhesive becomes difficult to biodegrade and causes environmental pollution
Solution Approach 1:
The patent extracts and removes the problematic tackifier components (rosin esters and terpene phenols) from the adhesive formulation. Instead, it uses the biodegradable polyester resin itself to provide the necessary tackifying properties, thereby maintaining adhesive tackiness while eliminating the harmful environmental factors associated with conventional tackifiers.
3Ease of operation
If polyols such as trimethylolpropane are used to dissolve polyester adhesives, then the adhesive can be applied, but the adhesive exhibits poor solubility and dispersibility in solvents, insufficient solvent stability, and high softening point resulting in reduced tackiness at room temperature
Solution Approach 1:
The patent changes the molecular structure parameters of the polyester resin to achieve optimal solubility and softening point characteristics. By carefully selecting monomers and controlling polymerization, the resin achieves good solubility in common solvents, appropriate softening point for room temperature tackiness, and sufficient solvent stability, eliminating the need for problematic polyols like trimethylolpropane.
4Strength
If isocyanates are added to increase molecular weight and improve tackiness, then the adhesive tackiness is improved, but the adhesive becomes difficult to recycle and does not biodegrade
Solution Approach 1:
The patent extracts and removes isocyanates from the adhesive formulation. Instead of using isocyanates to increase molecular weight and improve tackiness, the patent achieves these properties through the biodegradable polyester resin structure itself, using appropriate monomer selection and polymerization to create molecules with suitable weight and adhesive properties that are fully biodegradable.
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 biodegradable polyester polymer exhibits excellent solubility, storage stability, and tackiness, with improved peel strength, even without tackifiers, and is environmentally friendly.
Implementation Method 1
A method for preparing a biodegradable polyester polymer may comprise (A) performing an esterification reaction of sebacic acid and an excess of neopentylene glycol, followed by polycondensation to prepare a poly(neopentylene sebacate) oligomer
Implementation Method 2
performing an esterification reaction of sebacic acid and an excess of neopentylene glycol, followed by polycondensation to prepare a poly(neopentylene sebacate) oligomer
Implementation Method 3
The poly(neopentyl sebacate) oligomer may have a weight average molecular weight (Mw) of 2,000 to 6,000 g/mol
Implementation Method 4
a biodegradable adhesive composition comprising the same... which exhibits excellent tackiness even without the inclusion of a tackifier
Data Source
AI summary
The present disclosure provides a biodegradable polyester polymer for adhesives, prepared using poly(neopentylene sebacate) oligomers, in order to address the problem of non-biodegradability in conventional polymers prepared using carcinogenic isocyanates, polyols, or tackifiers. The biodegradable polyester polymer exhibits excellent solubility and storage stability, and an adhesive composition comprising the biodegradable polyester polymer can exhibit excellent tackiness and peel strength even without the addition of a separate tackifier.