Coated Magnetic Polymer Particles Preventing Crystal Leaching

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Solution Overview

Problem

Existing methods for producing magnetic polymer particles face challenges in achieving uniform size and homogeneous magnetic properties, and there is a problem with the leaching of superparamagnetic crystals, which affects their longevity in applications.

Innovation Solution

The process involves reacting surface-functionalized, superparamagnetic polymer particles with a combination of polyisocyanate and diol or epoxide monomers to create coated magnetic polymer particles, which physically encapsulate the superparamagnetic crystals, reducing porosity and enhancing stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If porous polymer particles are impregnated with iron compounds and precipitated to produce magnetic particles, then magnetic particles can be produced, but leaching of superparamagnetic crystals occurs which shortens useful lifetime

Engineering Contradiction:

Improveuseful lifetimeVSAvoidleaching of superparamagnetic crystals

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent applies nesting by placing superparamagnetic crystals inside cavities of porous polymer particles, then coating the exterior surface. This nested structure prevents leaching while maintaining magnetic properties, directly resolving the contradiction between reliability and substance loss.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent uses a coating layer applied to the exterior surface of magnetic polymer particles to prevent leaching. This thin film approach protects the embedded superparamagnetic crystals without compromising their magnetic functionality, solving the leaching problem while maintaining particle reliability.

Inventive Principle:

Principle #30Flexible shells and thin films

2Ease of manufacture

If deposition takes place principally on the surface or in large open cavities, then magnetic particles can be formed, but leaching occurs and useful lifetime is shortened

Engineering Contradiction:

Improvedeposition processVSAvoiduseful lifetime

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies local quality by creating distinct zones: interior cavities for magnetic material deposition and an exterior coating layer for protection. This spatial differentiation allows easy manufacture through surface deposition while preventing leaching, resolving the contradiction between manufacturing ease and reliability.

Inventive Principle:

Principle #3Local quality

3Quantity of substance

If porous polymer particles are used to incorporate magnetic material, then magnetic particles can be produced, but difficulty exists in incorporating magnetic material inside cavities

Engineering Contradiction:

Improvemagnetic material incorporationVSAvoidincorporation process

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent applies preliminary action by first forming porous polymer particles with cavities, then impregnating with iron compounds before precipitation. This sequential approach simplifies magnetic material incorporation into cavities while ensuring adequate quantity, resolving the contradiction between substance quantity and manufacturing ease.

Inventive Principle:

Principle #10Preliminary action

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

This approach results in magnetic particles with improved surface characteristics and reduced leaching, leading to more stable and effective magnetic polymer particles suitable for diagnostic and therapeutic applications.

Implementation Method 1

reacting surface-functionalized, superparamagnetic polymer particles with a combination of polyisocyanate and diol or epoxide monomers to create coated magnetic polymer particles

Methodology Applied

Scientific EffectPolymerization:

Data Source

PatentUS8038987B2Process for the preparation of coated polymer particles

Publication Date: 2011.10.18 INVITROGEN DYNAL AS

AI summary

A process for the preparation of coated polymer particles containing superparamagnetic crystals, said process comprising reacting porous, surface-functionalized, superparamagnetic crystal-containing polymer particles of diameter 0.5 to 1.8 μm with at least one polyisocyanate and at least one diol or at least one epoxide.