Biodegradable Adhesive Formulations Using mcl-PHA
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Solution Overview
Problem
Current adhesive films, particularly those used in packaging, are non-biodegradable and petroleum-based, posing environmental concerns due to their source and disposal impacts, necessitating the development of biodegradable and biobased adhesive compositions that provide sufficient adhesion while degrading environmentally soundly.
Innovation Solution
The use of medium chain length polyhydroxyalkanoates (mcl-PHA) produced by microbial fermentation, combined with curing agents like benzoyl peroxide and nanoclay, to create biodegradable and biobased hot melt and pressure sensitive adhesive formulations that are free or low in solvents and incorporate biodegradable components such as tackifiers and waxes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional petroleum-based adhesives are used, then adhesion performance is achieved, but environmental friendliness deteriorates due to non-biodegradability and petroleum derivatives
Solution Approach 1:
The patent changes the chemical composition parameters by using mcl-PHA as the base polymer instead of conventional petroleum-based polymers. This parameter change maintains adhesion performance while improving environmental friendliness through biodegradability and renewable sourcing.
Solution Approach 2:
The patent creates a composite adhesive formulation combining mcl-PHA with tackifiers, waxes, and optional fillers. This composite approach allows the biodegradable base polymer to provide environmental benefits while the added components ensure sufficient adhesion performance for packaging applications.
2Object-affected harmful factors
If biodegradable biobased polymers are used to improve environmental friendliness, then adhesion performance deteriorates due to insufficient bonding strength
Solution Approach 1:
The patent adjusts formulation parameters by incorporating specific ratios of tackifiers (35-55% by weight) and waxes (2-35% by weight) into the mcl-PHA base. These parameter adjustments enhance adhesion strength while maintaining the biodegradable and biobased characteristics of the adhesive.
Solution Approach 2:
The patent formulates a composite adhesive system where mcl-PHA serves as the biodegradable matrix and is combined with functional additives including tackifiers for bonding enhancement, waxes for flexibility and water resistance, and optional nanoclay fillers. This composite structure achieves both environmental friendliness and sufficient adhesion strength for practical packaging applications.
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 adhesive formulations offer strong adhesion properties while being environmentally friendly, degrading in an environmentally sound manner, and are produced from renewable sources, addressing the need for sustainable adhesive solutions.
Implementation Method 1
biodegradable adhesive compositions... that degrade later in an environmentally sound fashion
Implementation Method 2
mcl-PHA, produced by microbial fermentation of renewable feedstock
Implementation Method 3
the formulation comprises a curing (crosslinking) agent
Data Source
Figure 1~2
Figure 3(A)~4
Figure 5~6
AI summary
An adhesive formulation such as a hot melt adhesive or a pressure sensitive adhesive is provided comprising 5 to 98% (by weight) biodegradable substantially non-crystalline mcl-PHA. The mcl-PHA may be cured with a peroxide curing agent. The adhesive formulation may include an additional biodegradable polymer, or a non-biodegradable thermoplastic elastomer. Hot melt adhesives comprising significant amounts of biodegradable mcl-PHA, waxes, and tackifiers are also provided.