Color-Stable Polyisocyanate Compositions via Stabilizer Extraction

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Solution Overview

Problem

Polyisocyanate compositions mixed with solvents containing C7-C14 aromatic hydrocarbons face stabilization issues, including color drift, odor problems, toxicity concerns, and moisture sensitivity, which affect occupational hygiene and health, and require improved stabilizing action comparable to prior art.

Innovation Solution

The development of polyisocyanate compositions comprising at least one polyisocyanate obtained by reacting monomeric isocyanates with a solvent mixture of C7-C14 aromatic hydrocarbons, optionally including Lewis-acidic organic metal compounds and other additives, to achieve color stability and improved safety and health profiles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If phosphites (particularly tributyl phosphite) are used as stabilizers in polyisocyanate compositions, then antioxidative stabilization is achieved, but unpleasant odor and toxicological hazards occur

Engineering Contradiction:

Improvestabilization effectivenessVSAvoidodor and toxicity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces long-term stable but toxic phosphites with a combination of shorter-lived stabilizers (phenolic antioxidants and secondary antioxidants) that provide sufficient stabilization during storage and use without the persistent toxicological and odor problems of phosphites

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The invention extracts and removes the harmful phosphite component from the stabilization system while retaining the essential antioxidative protection through alternative stabilizer combinations, specifically eliminating the source of unpleasant odor and toxicity

Inventive Principle:

Principle #2Taking out (Extraction)

2Object-affected harmful factors

If aliphatic phosphites are used as stabilizers, then lower toxicological hazards compared to aromatic phosphites are achieved, but availability and effectiveness are reduced

Engineering Contradiction:

ImprovetoxicityVSAvoidstabilization effectiveness

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent employs a composite stabilization system combining primary antioxidants (sterically hindered phenols) with secondary antioxidants (thio compounds or phosphonites/phosphonates) to achieve synergistic antioxidative protection that matches or exceeds the effectiveness of aliphatic phosphites while maintaining lower toxicity

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention merges multiple stabilization mechanisms (primary antioxidant protection against radical formation and secondary antioxidant protection against hydroperoxide decomposition) into a unified stabilization system that compensates for the reduced effectiveness of individual lower-toxicity stabilizers

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If phosphites are used for stabilization, then antioxidative action is achieved, but moisture sensitivity and processing problems occur

Engineering Contradiction:

Improvestabilization actionVSAvoidprocessing ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent removes the moisture-sensitive phosphite component from the stabilization system and replaces it with moisture-stable alternative stabilizers (phenolic antioxidants and thio compounds/phosphonites) that do not exhibit the same hydrolysis sensitivity and processing difficulties

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention changes the chemical parameters of the stabilizer system from moisture-sensitive phosphites to moisture-stable phenolic and thio-based stabilizers, fundamentally altering the moisture interaction characteristics to eliminate processing problems while preserving antioxidative function

Inventive Principle:

Principle #35Parameter changes

4Adaptability or versatility

If polyisocyanate compositions are stored with solvents containing C7-C14 aromatic hydrocarbons, then solubility and application properties are improved, but color drift occurs over time

Engineering Contradiction:

Improvesolubility and application propertiesVSAvoidcolor stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent applies stabilization measures in advance by incorporating antioxidant stabilizers into the polyisocyanate composition before storage with aromatic hydrocarbon solvents, preventing color drift from occurring during the storage period rather than attempting to treat it after formation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention introduces stabilizer molecules as intermediary substances between the polyisocyanate and the aromatic hydrocarbon solvent, where these stabilizers intercept and neutralize the degradation mechanisms that would otherwise cause color drift during storage

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20240059826A1Color-stable curing agent compositions comprising polyisocyanates of (CYCLO)aliphatic diisocyanates

Publication Date: 2024.02.22 BASF SE

AI summary

Polyisocyanate composition containing(A) at least one polyisocyanate obtainable by reacting at least one monomeric isocyanate,(B) at least one solvent containing a mixture of C7-C14 aromatic hydrocarbons,(C) optionally at least one further solvent,(D) optionally at least one Lewis-acidic organic metal compound capable of accelerating the reaction of isocyanate groups with isocyanate-reactive groups,(E) optionally other coatings additives,wherein the amount of cumene in component (B) is less than 1 wt %, preferably less than 0.7 wt %.