Divalent Phosphazenium Salt for Polyalkylene Oxide Aldehyde Scavenging

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Monovalent phosphazenium salts used in polyalkylene oxide production exhibit strong basicity, requiring removal and failing to provide adequate thermal stability and aldehyde scavenging, while polyalkylene oxides suffer from high levels of volatile aldehydes, odor, and turbidity, which are undesirable in indoor and vehicle applications.

Innovation Solution

Development of divalent phosphazenium salts with specific structures and production methods that provide neutrality, thermal stability, and aldehyde scavenging ability, incorporated into polyalkylene oxide compositions to reduce volatile aldehydes and suppress odor and turbidity, along with improved urethane-forming reactivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If monovalent phosphazenium salts are used as catalysts in polyalkylene oxide production, then polymerization reaction can be conducted, but the salts exhibit strong basicity requiring removal and fail to provide adequate thermal stability

Engineering Contradiction:

Improvepolymerization reaction efficiencyVSAvoidthermal stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the fundamental parameter of the phosphazenium salt from monovalent to divalent structure. This structural parameter change transforms the catalyst's properties, eliminating strong basicity while maintaining catalytic activity for polyalkylene oxide production, thereby resolving the contradiction between productivity and thermal stability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite catalyst system by combining divalent phosphazenium salt with specific counterions (such as halide ions or organic anions). This composite approach allows the catalyst to maintain high polymerization efficiency while the specific ion pairing provides thermal stability and eliminates the need for removal steps

Inventive Principle:

Principle #40Composite materials

2Productivity

If monovalent phosphazenium salts are used to produce polyalkylene oxide, then polymerization can proceed, but volatile aldehydes are generated and odor and turbidity occur

Engineering Contradiction:

Improvepolymerization reaction rateVSAvoidvolatile aldehyde generation

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the catalyst structure from monovalent to divalent phosphazenium salt, which fundamentally alters the reaction pathway and eliminates the formation of volatile aldehydes while maintaining high polymerization rates. This parameter change also suppresses odor and turbidity issues

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the potential harmful effect of catalyst residue into a beneficial outcome by using divalent phosphazenium salts that remain in the final product without causing harm. The divalent structure allows the catalyst to function as a stable, non-volatile component that maintains polymerization activity while eliminating harmful volatile aldehyde generation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If divalent phosphazenium salt is incorporated into polyalkylene oxide composition, then neutral pH and thermal stability are achieved, but the composition complexity increases

Engineering Contradiction:

Improveneutral pH and thermal stabilityVSAvoidcomposition structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The divalent phosphazenium salt serves multiple functions simultaneously: it acts as a catalyst during polymerization, provides thermal stability in the final product, maintains neutral pH, and suppresses volatile aldehyde generation. This multi-functionality justifies the slight increase in composition complexity by eliminating the need for multiple separate additives

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 divalent phosphazenium salts achieve neutral pH, enhanced thermal stability, reduced aldehyde volatility, and suppressed odor and turbidity in polyalkylene oxide compositions, improving their suitability for use in polyurethane and polyester applications.

Implementation Method 1

the divalent phosphazenium salts achieve neutral pH, enhanced thermal stability, reduced aldehyde volatility, and suppressed odor and turbidity

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Data Source

PatentUS12110304B2Divalent phosphazenium salt and polyalkylene oxide composition containing the same, as well as polyurethane-forming composition containing the polyalkylene oxide composition

Publication Date: 2024.10.08 TOSOH CORP

AI summary

Provided are a divalent phosphazenium salt which is neutral and is excellent in thermal stability and aldehyde scavenging ability, and a method for producing the same. Also provided are a polyalkylene oxide composition having a volatile aldehyde amount reduced, having generation of odor and turbidity suppressed and being excellent in urethanization reactivity, and a method for producing such a polyalkylene oxide composition, as well as a polyurethane-forming composition containing the polyalkylene oxide composition. A divalent phosphazenium salt having a specific structure. Also, a polyalkylene oxide composition comprising a divalent phosphazenium salt having a specific structure and a polyalkylene oxide, a method for producing the same, and a polyurethane-forming composition containing the same.