Polymer Coating Migrateables Reduction via Norrish Photoinitiator
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Solution Overview
Problem
Existing polymer coatings for medical devices and surfaces face challenges in maintaining functional properties while minimizing the migration of polymers, especially under mechanical stress, temperature changes, and exposure to solvents or body fluids, leading to contamination and loss of functional properties.
Innovation Solution
A process using a Norrish type I photoinitiator to induce polymer cross-linking between a supporting and a functional polymer through hydrogen abstraction, allowing for effective grafting without the need for additional reactive groups, thereby forming a stable and durable coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cross-link density of the supporting polymer is increased to reduce polymer migration, then the amount of migrateables is reduced, but the coating becomes brittle and mechanical requirements fail
Solution Approach 1:
The patent changes the chemical parameters of the supporting polymer by introducing specific functional groups (carboxyl, hydroxyl, amine, or isocyanate groups) that can form strong intermolecular interactions with the functional polymer. This alternative approach to reducing migration avoids excessive cross-linking while maintaining coating integrity and mechanical properties.
Solution Approach 2:
The patent creates a composite structure where the supporting polymer and functional polymer are chemically associated through specific functional group interactions. This composite approach allows the functional polymer to be retained in the coating without requiring high cross-link density, thus preventing brittleness while reducing migrateables.
2Reliability
If Van der Waals, hydrogen bonding or electrostatic interactions are increased to reduce polymer migration, then polymer retention is improved, but these methods are insufficient under mechanical perturbation, temperature changes, and solvent exposure
Solution Approach 1:
The patent enhances the interaction parameters between supporting and functional polymers by introducing reactive functional groups that form stronger chemical associations. These groups (carboxyl, hydroxyl, amine, isocyanate) create more robust bonds that resist breakdown under mechanical stress, temperature variations, and solvent exposure compared to ordinary Van der Waals forces.
Solution Approach 2:
The patent transitions from physical interactions (Van der Waals, hydrogen bonding) to chemical interactions involving reactive functional groups. This dimensional change in interaction strength provides a new level of polymer retention that remains effective under harsh conditions including mechanical perturbation, temperature changes, and solvent exposure.
3Reliability
If cross-links are introduced between functional polymers to form total IPN, then polymer migration is reduced, but the coating requires complicated chemical procedures and cross-linkable groups
Solution Approach 1:
The patent extracts the cross-linking requirement from the functional polymer by placing it solely on the supporting polymer. The supporting polymer is equipped with reactive functional groups that interact with the functional polymer, eliminating the need to modify the functional polymer with cross-linkable groups and simplifying the overall procedure.
Solution Approach 2:
The patent introduces functional groups on the supporting polymer as intermediaries that mediate the interaction between the supporting and functional polymers. These functional groups (carboxyl, hydroxyl, amine, isocyanate) serve as chemical bridges that retain the functional polymer without requiring complex cross-linking procedures or modifications to the functional polymer structure.
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 results in a coating with improved adherence and reduced polymer migration, maintaining functional properties and reducing contamination risks, especially in medical applications where stability and biocompatibility are crucial.
Implementation Method 1
A process using a Norrish type I photoinitiator to induce polymer cross-linking between a supporting and a functional polymer through hydrogen abstraction
Implementation Method 2
A process using a Norrish type I photoinitiator to induce polymer cross-linking
Data Source
AI summary
This invention relates to an improved process for obtaining a cross-linked polymer coating on a surface. The invention also relates to coatings obtainable by that process and objects coated therewith. The invention also relates to medical devices comprising a coating, in particular to coils coated with an improved lubricious coating.