Biodegradable Adhesive Polyester With Tackifier-Free Tack
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Solution Overview
Problem
Conventional polyester adhesives are non-biodegradable, cause environmental pollution, and exhibit poor solubility, dispersibility, and tackiness issues due to the use of tackifiers and polyols, making them difficult to recycle.
Innovation Solution
A biodegradable polyester polymer is developed using a polymerizable composition comprising dicarboxylic acids, aliphatic glycols, and poly(neopentyl sebacate) oligomers, which are combined through esterification and polycondensation reactions to create a polymer with excellent solubility and tackiness without the need for tackifiers or polyols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polyester resins are used in adhesives, then adhesive strength is improved, but biodegradability deteriorates causing environmental pollution
Solution Approach 1:
The patent changes the chemical composition parameters by using biodegradable polyester resins with specific molecular weight ranges (5,000-50,000) and controlling the hydroxyl value (15-50 mg KOH/g), replacing conventional non-biodegradable polyester resins while maintaining adhesive performance through parameter optimization
Solution Approach 2:
The patent creates a composite adhesive system combining biodegradable polyester resin with specific additives including polyols (10-40 parts by weight), isocyanates (5-20 parts by weight), and other components to achieve both biodegradability and adhesive strength
2Strength
If tackifiers such as rosin esters and terpene phenols are added to improve tackiness, then adhesive tackiness is improved, but biodegradability deteriorates causing environmental pollution
Solution Approach 1:
The patent extracts and removes harmful non-biodegradable tackifiers (rosin esters, terpene phenols) from the adhesive formulation, replacing them with biodegradable alternatives while maintaining tackiness through the optimized polyester resin composition and polyol additives
Solution Approach 2:
The patent changes the tackiness achievement mechanism by adjusting the polyol content (10-40 parts by weight) and isocyanate content (5-20 parts by weight) to replace the function of conventional tackifiers without using harmful substances
3Strength
If polyols such as trimethylolpropane are used to improve tackiness, then adhesive tackiness is improved, but solubility and dispersibility deteriorate
Solution Approach 1:
The patent optimizes the polyol molecular weight parameter (500-2,000) and content (10-40 parts by weight) to achieve the right balance between tackiness enhancement and maintaining solubility in common solvents like toluene, xylene, and ethyl acetate
4Strength
If a large amount of isocyanates are added to increase molecular weight and improve tackiness, then adhesive performance is improved, but biodegradability deteriorates and environmental pollution increases
Solution Approach 1:
The patent controls the isocyanate content parameter (5-20 parts by weight) and molecular weight (5,000-50,000) to achieve sufficient adhesive strength and tackiness while minimizing the amount of non-biodegradable isocyanates, maintaining biodegradability of the overall system
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 resulting polymer demonstrates improved solubility, storage stability, and tackiness, with a glass transition temperature of -40°C or less, enabling the production of an environmentally friendly adhesive composition with high peel strength and tackiness at room temperature.
Implementation Method 1
A biodegradable polyester polymer prepared from a polymerizable composition may comprise (a) a dicarboxylic acid-based compound including an aromatic dicarboxylic acid, an aliphatic dicarboxylic acid, or a mixture thereof, (b) an aliphatic glycol compound, and (c) a poly(neopentyl sebacate) oligomer
Implementation Method 2
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, and (B) performing esterification and transesterification reactions of a dicarboxylic acid-based compound, an aliphatic glycol compound, and the poly (neopentylene sebacate) oligomer, followed by polycondensation to prepare a polyester polymer
Implementation Method 3
The glass transition temperature may be -40°C or less
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.