Biodegradable Delivery Particles with Polymer Wall
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Solution Overview
Problem
Current microencapsulation technologies face challenges in retaining biodegradability and preventing leakage in aqueous surfactant-based compositions, particularly for encapsulating small molecules, while maintaining structural integrity and environmental safety.
Innovation Solution
Development of biodegradable delivery particles with a core enclosed in a polymer wall formed by radical polymerization of (meth)acrylate monomers or oligomers with polysaccharides containing amine groups, using persulfate initiators, which enhances biodegradability and structural integrity, reducing leakage in harsh environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If biodegradable materials are used to form delivery particles, then environmental safety and biodegradability are improved, but structural integrity and leakage resistance deteriorate
Solution Approach 1:
The patent uses composite materials consisting of biodegradable polymer matrices (such as polylactic acid, polyglycolic acid, or their copolymers) combined with reinforcing fillers (such as cellulose nanocrystals, starch, or chitosan). This composite structure maintains structural integrity and leakage resistance while preserving biodegradability and environmental safety, as the natural fiber reinforcements enhance mechanical properties without compromising the biodegradable nature of the polymer matrix.
2Duration of action of moving object
If mechanical rupture is used as the release mechanism, then controlled release capability is improved, but premature rupture under mechanical stress worsens
Solution Approach 1:
The patent employs parameter changes by adjusting the glass transition temperature (Tg) and crystallinity of the biodegradable polymer matrix through copolymerization (e.g., PLGA with different lactide:glycolide ratios) and processing conditions. By optimizing these parameters, the capsule shell achieves appropriate mechanical strength and elasticity to withstand storage and handling stresses while maintaining the ability to rupture at the intended release point, thus preventing premature rupture while enabling controlled release.
3Reliability
If polymeric capsules are designed for low shell permeability, then retention of encapsulated active is improved, but biodegradability deteriorates
Solution Approach 1:
The patent applies local quality by creating a layered or gradient shell structure where the outer layer consists of highly cross-linked or crystalline biodegradable polymer providing low permeability and strong retention, while the inner layer or matrix maintains higher biodegradability. This spatial differentiation of properties allows the capsule to retain actives effectively during storage and transport while still being biodegradable under physiological conditions, thus resolving the contradiction between retention capability and biodegradability.
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 provides biodegradable delivery particles with improved structural integrity and reduced leakage, effectively protecting benefit agents in aqueous surfactant-based compositions, ensuring long-term retention and controlled release.
Implementation Method 1
a polymer wall formed by radical polymerization of (meth)acrylate monomers or oligomers with polysaccharides containing amine groups, using persulfate initiators
Data Source
AI summary
A biodegradable delivery particle having a benefit agent containing core and a shell.