Polyurethane Composition for Bubble-Free Clear Adhesives

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Solution Overview

Problem

Existing polyurethane compositions used in coatings, adhesives, sealants, and materials formed from reaction injection molding (RIM) suffer from bubbling issues due to the reaction between isocyanate groups and water, leading to inferior product quality such as lower adhesion performance and poor appearance, and traditional dehydrating agents like Zeolite powder are not suitable for clear or transparent products.

Innovation Solution

Incorporating a Lewis acid catalyst polymerized polyether polyol with specific molecular weight, hydroxyl group content, and acetal content into the polyurethane composition to reduce bubbling, while maintaining clarity and transparency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional polyurethane composition is used, then adhesion and appearance are achieved, but bubble formation occurs due to reaction between isocyanate groups and water

Engineering Contradiction:

Improvebubble formationVSAvoidadhesion quality

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent changes the molecular weight parameter of the polyether polyol to a specific range (200-1000 g/mol) and adjusts the primary hydroxyl group content to at least 30%, which modifies the reaction characteristics to reduce bubble formation while maintaining adhesion quality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a Lewis acid catalyst as an intermediary substance to mediate the polymerization reaction, creating a polyether polyol with specific properties that reduce harmful bubble formation while preserving beneficial adhesion characteristics

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If Zeolite powder is used to reduce bubble formation, then bubble formation is reduced, but the product is not suitable for clear or transparent applications

Engineering Contradiction:

Improvebubble formationVSAvoidtransparency

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The patent replaces the permanent opaque Zeolite powder with a molecular-level approach using low molecular weight polyether polyol and Lewis acid catalyst, achieving bubble reduction without compromising transparency, as the active components are at a scale that does not scatter light

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent replaces the mechanical/physical approach of using Zeolite powder particles with a chemical approach using Lewis acid catalyst polymerization, transitioning from a particulate system to a molecular-level solution that maintains optical clarity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12624146B2Polyurethane composition

Publication Date: 2026.05.12 DOW GLOBAL TECHNOLOGIES LLC

AI summary

Embodiments relate to a coating, adhesive, sealant, elastomer, or reaction injection molded material forming polyurethane composition that comprises an isocyanate component that includes at least one isocyanate-terminated prepolymer, and an isocyanate reactive component that includes at least one Lewis acid catalyst polymerized polyether polyol having a weight average molecular weight from 200 g/mol to 1,000 g/mol, an average primary hydroxyl group content of at least 30%, and an average acetal content of at least 0.05 wt %.