Crosslinked PVP Hydrogen Peroxide Complex for Stable Whitening
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Solution Overview
Problem
Hydrogen peroxide-based tooth whitening products are challenging to formulate due to their high reactivity and tendency to decompose, leading to variable peroxide delivery and stability issues, which affect their whitening efficacy and safety.
Innovation Solution
A dentifrice composition incorporating a crosslinked polyvinylpyrrolidone complexed with hydrogen peroxide, along with other ingredients like glycerin, propylene glycol, and calcium pyrophosphate, which maintains stability and ensures consistent peroxide release, thereby enhancing whitening efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrogen peroxide is used as a whitening agent, then whitening efficacy is improved, but stability and reliability deteriorate due to spontaneous decomposition
Solution Approach 1:
The patent applies preliminary action by pre-complexing hydrogen peroxide with polyvinylpyrrolidone in a controlled environment before use. This pre-association prevents spontaneous decomposition during storage while maintaining the peroxide's whitening capability when applied to teeth, thus resolving the contradiction between efficacy and stability
Solution Approach 2:
The patent uses polyvinylpyrrolidone as an intermediary substance that mediates between the hydrogen peroxide and the external environment. This intermediary forms a stable complex that protects the peroxide from premature decomposition while still allowing it to function as a whitening agent, thereby improving both reliability and productivity
2Productivity
If high levels of peroxide are initially formulated, then whitening potency is improved, but consistency of delivery worsens due to variable decomposition over time
Solution Approach 1:
The patent performs preliminary complexation of peroxide with polyvinylpyrrolidone during manufacturing, creating a stable reservoir that releases peroxide at controlled rates. This preliminary action ensures consistent peroxide delivery over time while maintaining high whitening potency, resolving the contradiction between potency and consistency
3Productivity
If hydrogen peroxide is stored in dentifrice containers, then whitening function is improved, but container integrity worsens due to bloating and leakage from oxygen gas formation
Solution Approach 1:
The patent employs polyvinylpyrrolidone as an intermediary that binds hydrogen peroxide in a stable complex, preventing its spontaneous decomposition into oxygen gas. This intermediary action eliminates the harmful bloating and leakage effects on containers while preserving the whitening function, thus resolving the contradiction between function and container integrity
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 composition provides stable and effective tooth whitening, outperforming commercial products in terms of whitening efficacy and maintaining stability over time, with reduced risk of container leakage and improved peroxide delivery.
Implementation Method 1
a crosslinked polyvinylpyrrolidone complexed with hydrogen peroxide
Implementation Method 2
hydrogen peroxide can spontaneously decompose to form oxygen gas (O2) and water
Implementation Method 3
Hydrogen peroxide can bleach both extrinsic and intrinsic stains and so provides faster and superior whitening efficacy
Data Source
AI summary
Described herein are oral care compositions comprising a crosslinked polyvinylpyrrolidone complexed with hydrogen peroxide; including some embodiments which further comprise an ethylene oxide, propylene oxide block co-polymer.