Biodegradable PBAE Microcapsules via O/W Radical Polymerization

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Solution Overview

Problem

Existing microcapsules are not biodegradable, leading to environmental concerns due to their persistence in ecosystems, and current methods for producing biodegradable microcapsules are slow and impractical for industrial use.

Innovation Solution

The use of poly(beta-amino ester) (PBAE) microcapsules synthesized through radical polymerization in an O/W emulsion, forming a crosslinked polymer wall that is biodegradable, with optional vinyl monomers and a polymerization initiator in both phases.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional polymer families (polyamides, polyurethanes, polyureas) are used for microcapsule walls, then the walls are strong and stable, but they are not biodegradable and cause environmental persistence

Engineering Contradiction:

Improvewall stabilityVSAvoidenvironmental persistence

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the polymer wall by using poly(beta-amino ester) instead of conventional polyamides, polyurethanes, or polyureas. This parameter change maintains the structural integrity and stability needed for microcapsule function while introducing biodegradability through the specific chemical structure of beta-amino ester bonds that can be hydrolyzed by environmental factors.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If interfacial polymerization is used to prepare microcapsules, then the preparation is quick and the wall is strong, but the method is not suitable for producing biodegradable microcapsules

Engineering Contradiction:

Improvepreparation speedVSAvoidnon-biodegradability

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the polymerization method parameters by using radical polymerization instead of interfacial polymerization. This allows for the formation of biodegradable poly(beta-amino ester) walls while maintaining efficient production capabilities. The radical polymerization process uses different reaction conditions and mechanisms that are compatible with biodegradable monomers.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent substitutes the chemical mechanism of interfacial polymerization with radical polymerization. This mechanism substitution enables the formation of biodegradable polymer structures while maintaining the efficiency and speed required for practical production. The radical initiation process differs fundamentally from interfacial polymerization but achieves similar encapsulation results with improved environmental properties.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Object-affected harmful factors

If biodegradable materials are used for microcapsule walls, then environmental persistence is reduced, but the preparation methods are slow and impractical for industrial use

Engineering Contradiction:

ImprovebiodegradabilityVSAvoidproduction efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent replaces slow conventional biodegradable preparation methods with radical polymerization. This substitution of the polymerization mechanism enables faster reaction kinetics and more efficient production while maintaining the biodegradable nature of the poly(beta-amino ester) wall material. The radical process allows for controlled polymerization that is both environmentally friendly and industrially viable.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical 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 method produces stable, biodegradable microcapsules that can encapsulate a wide range of active substances, offering good protection and meeting industrial production requirements.

Implementation Method 1

This method performs radical polymerization of multifunctional compounds in an emulsion of the type O/W (Oil in Water) resulting in a wall of the cross-linked poly(beta-amino ester) type

Methodology Applied

Scientific EffectRadical polymerization: Photopolymerisation

Implementation Method 2

radical polymerization of multifunctional compounds in an emulsion of the type O/W (Oil in Water)

Methodology Applied

Scientific EffectEmulsion: Emulsion

Implementation Method 3

resulting in a wall of the cross-linked poly(beta-amino ester) type which is biodegradable

Methodology Applied

Scientific EffectCross-linking: Chemical Bonding

Data Source

PatentUS12589077B2Method for preparing biodegradable microcapsules and microcapsules thus obtained

Publication Date: 2026.03.31 GEM INNOV

AI summary

Method for manufacturing microcapsules comprising a wall made of polymer material containing an active substance, comprising the following steps: —preparing an oil phase comprising a poly(beta-aminoester) prepolymer, and an active substance constituting the phase to be encapsulated; preparing an aqueous phase comprising at least one surfactant; preparing an O/W (oil in water) emulsion by adding the oil phase to the aqueous phase; and initiating radical polymerisation with in the emulsion. A polymerisation initiator must be present in the aqueous and/or oil phase.