Stabilized Hydrogen Peroxide Composition Using Thermo-Sensitive Gel
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Solution Overview
Problem
Existing hydrogen peroxide bleaching compositions face stability issues due to unintended decomposition caused by metal ion contaminants, especially at acidic pH levels, and struggle with viscosity variability, making them unsuitable for applications like tooth whitening that require stability at room temperature and quick release.
Innovation Solution
A stabilized aqueous hydrogen peroxide composition using a copolymer of ammonium or alkali salt of acryloyldimethyltaurate and vinylpyrrolidone, combined with poly(ethylene oxide) homopolymer and block copolymer, along with a phosphorus-containing stabilizer and chelating agents, to create a thermo-sensitive gel with controlled viscosity and pH between 5.0 and 7.0, ensuring stability and quick release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrogen peroxide compositions are formulated with acidic pH to enhance bleaching effectiveness, then bleaching performance is improved, but stability against decomposition deteriorates due to metal ion catalysis
Solution Approach 1:
The patent introduces an intermediary substance (stabilizer such as phosphates, silicates, or chelating agents) that mediates between the acidic pH environment and metal ion contaminants. These stabilizers bind to metal ions or alter the chemical environment, preventing catalytic decomposition while allowing the acidic pH to maintain bleaching effectiveness.
Solution Approach 2:
The patent changes the chemical parameters of the composition by introducing specific stabilizers that modify the interaction between hydrogen peroxide and metal ions. By adjusting the type and concentration of stabilizers, the composition maintains acidic pH for effectiveness while achieving stability through altered chemical equilibria.
2Stability of the object's composition
If viscosity stabilizers are added to maintain consistent composition properties, then composition stability is improved, but release speed of peroxide deteriorates
Solution Approach 1:
The patent employs dynamic viscosity control using polymers that respond to environmental triggers (temperature, pH, ionic strength). These polymers maintain stable viscosity under storage conditions but undergo rapid conformational changes or degradation upon application, enabling quick peroxide release when needed.
Solution Approach 2:
The patent incorporates pre-formulated stabilizer systems that are designed to degrade or become inactive under specific activation conditions (such as temperature change or pH shift upon application). This preliminary setup ensures stability during storage while enabling rapid release during use without requiring additional processing.
3Reliability
If room temperature stability is enhanced through stabilizers and controlled formulations, then composition reliability is improved, but decomposition control becomes more difficult
Solution Approach 1:
The patent uses composite stabilizer systems combining multiple components (e.g., phosphates with chelating agents, or multiple polymers with different degradation triggers) that work synergistically to provide room temperature stability. This composite approach distributes the stabilization function across multiple mechanisms, making the system more robust but also more complex to formulate and control.
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 maintains stability at room temperature, exhibits reversible temperature-sensitive properties, and allows for variable viscosity, enabling effective tooth whitening applications via syringe, pen, or single-dose delivery, while minimizing decomposition and ensuring high penetration potential.
Implementation Method 1
a copolymer of an ammonium or alkali salt of acryloyldimethyltaurate and vinylpyrrolidone for encapsulating a mixture comprising at least hydrogen peroxide
Implementation Method 2
create a thermo-sensitive gel with controlled viscosity
Implementation Method 3
the composition exhibits reversible temperature-sensitive properties
Implementation Method 4
exhibits reversible temperature-sensitive properties, and allows for variable viscosity
Implementation Method 5
0,01 wt. % to 1 wt. % of a chelating agent or a mixture of chelating agents
Implementation Method 6
stabilizer system comprising 0,1 to 2 wt. % and 0,01 wt. % to 1 wt. % of a chelating agent or a mixture of chelating agents
Implementation Method 7
30 wt. % to 95 wt. % poly(ethylene oxide) homopolymer
Implementation Method 8
ensuring high penetration potential
Data Source
Figure 1
AI summary
A stabilized aqueous hydrogen peroxide composition comprising an urethane groups containing polymer encapsulating a mixture comprising at least hydrogen peroxide, water and poly(ethylene oxide) homopolymer, or for forming a matrix comprising a mixture of at least hydrogen peroxide, water and poly(ethylene oxide) homopolymer is disclosed. The composition comprising 2 wt. % to 30 wt. % of hydrogen peroxide, an amount of water, 1 wt. % to 10 wt. % poly(ethylene oxide)-poly(propylene oxide) block copolymer, 0,01 wt. % to 10 wt. % of a salt of a polymer or co-polymer comprising at least one urethane group based on at least a taurate, taurate salt, 2-alkyltaurate, 2-alkyltaurate salt, 2,2-dialkyltaurate, 2,2-dialkyltaurate salt or a mixture of at least two of the aforementioned taurates and at least an acrylic acid, acrylic acid derivative, co-polymer of acrylic acid and at least one ethylenically unsaturated monomer or a mixture thereof, wherein the alkyl is selected from methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, tert-butyl groups, and wherein the salt is selected from ammonium, alkali, earth alkali or zinc salts of these polymers or co-polymers, in particular ammonium or alkali salt of a copolymer of acryloyldimethyltaurate and vinylpyrrolidone, and 30 wt. % to 95 wt. % poly(ethylene oxide) homopolymer, 0,01 wt. % to 5 wt. % stabilizer system comprising 0,1 to 2 wt. % and 0,01 wt. % to 1 wt. % of a chelating agent or a mixture of chelating agents, wherein the composition comprises in total 100 wt. %.