Low-pH Polyphosphate Oral Care Composition for Stain Removal

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Solution Overview

Problem

Current oral care compositions using linear polyphosphates face challenges with acid catalyzed hydrolysis at low pH, leading to poor stain removal performance and potential enamel abrasion from high abrasive levels or oxidizing agents.

Innovation Solution

Formulations with medium and shorter length linear polyphosphates at a pH of 5 or less, incorporating a first linear polyphosphate with an average chain length of 6 to 21 and a second with 2 to 6, along with a fluoride ion source and sufficient water content, to enhance stain removal without increasing abrasives or oxidizing agents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If linear polyphosphates are formulated with low water content (<20 wt%) to mitigate acid catalyzed hydrolysis, then polyphosphate stability is improved, but stain removal performance deteriorates

Engineering Contradiction:

Improvepolyphosphate stabilityVSAvoidstain removal performance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the molecular parameters of polyphosphates by selecting specific chain lengths (6-21 units) that provide optimal balance between hydrolysis resistance and stain removal efficacy. This parameter optimization allows the composition to maintain polyphosphate stability while achieving improved stain removal performance without requiring low water content formulations

Inventive Principle:

Principle #35Parameter changes

2Productivity

If abrasive amount is increased to improve stain removal performance, then stain removal is improved, but Relative Dentin Abrasion (RDA) increases

Engineering Contradiction:

Improvestain removal performanceVSAvoidRelative Dentin Abrasion

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical abrasion system with a chemical action system. Medium length linear polyphosphates chemically interact with stain components through complexation and chelation mechanisms, providing effective stain removal without relying on mechanical abrasion. This substitution eliminates the need to increase abrasive amounts while maintaining or improving stain removal performance

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If oxidizing agents are added to improve stain removal performance, then stain removal is improved, but oral cavity irritation increases

Engineering Contradiction:

Improvestain removal performanceVSAvoidoral cavity irritation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent employs medium length linear polyphosphates as effective but gentle stain removal agents that work through controlled chemical complexation rather than aggressive oxidation. These polyphosphates provide sufficient stain removal capability without the harsh side effects of oxidizing agents, eliminating the need to add irritating oxidizing agents to the formulation

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

4Productivity

If pH is reduced to about 5 or less to improve stain removal, then stain removal performance is improved, but acid catalyzed hydrolysis of polyphosphates increases

Engineering Contradiction:

Improvestain removal performanceVSAvoidpolyphosphate stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent optimizes multiple parameters simultaneously: selecting medium chain length polyphosphates (6-21 units) that inherently resist hydrolysis better than shorter chains, formulating at pH 5 or less for enhanced stain removal, and achieving synergistic effect where the specific polyphosphate structure maintains stability even at lower pH. This multi-parameter optimization resolves the contradiction between low pH and polyphosphate stability

Inventive Principle:

Principle #35Parameter changes

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 compositions demonstrate improved stain removal efficacy with reduced Relative Dentin Abrasion (RDA) and Pellicle Cleaning Ratio (PCR), maintaining oral health while avoiding abrasive and oxidizing agent-related issues.

Implementation Method 1

polyphosphate sources, which can alleviate these challenges

Methodology Applied

Scientific EffectChelation:

Implementation Method 2

polyphosphate molecules can remove more stain from teeth at lower pHs

Methodology Applied

Scientific EffectComplexation:

Implementation Method 3

linear polyphosphates undergo acid catalyzed hydrolysis reactions while in compositions with a pH of 6 or less

Methodology Applied

Scientific EffectAcid catalyzed hydrolysis: Hydrolysis

Data Source

PatentEP4725561A2Oral care compositions comprising medium length polyphosphates

Publication Date: 2026.04.15 PROCTER & GAMBLE CO

AI summary

An oral care composition with one or more polyphosphates with about 20 wt% or more of water at a pH of about 5 or less. A dentifrice composition with one or more polyphosphates with about 20 wt% or more of water at a pH of about 5 or less. A mouth rinse composition with one or more polyphosphates with about 20 wt% or more of water at a pH of about 5 or less.