Fluorine-Free Alkyl Ester Additives for Water Repellency

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Solution Overview

Problem

The use of partially fluorinated small molecule additives in thermoplastic polymers has come under regulatory scrutiny, necessitating the development of fluorine-free and silicone-free alternatives that can provide water repellency without the environmental and regulatory concerns associated with fluorinated materials.

Innovation Solution

The development of small molecule additives with the structure where each of R1, R2, R3, and R4 is independently a 12 to 50 carbon alkyl group, which are used in thermoplastic compositions to impart water repellency without containing fluorine or silicone.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If partially fluorinated small molecule additives are used in thermoplastic polymers, then water and oil repellency is improved, but environmental harm and regulatory compliance worsen

Engineering Contradiction:

Improvewater and oil repellencyVSAvoidenvironmental harm from fluorinated materials

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by replacing fluorinated small molecule additives with fluorine-free alternatives having specific molecular structures (aromatic esters with long alkyl chains). This substitution maintains the water and oil repellency function while eliminating the harmful fluorinated compounds, thus resolving the contradiction between performance reliability and environmental harm.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs conventional, readily available chemical structures (aromatic esters with long alkyl chains) that can be synthesized through standard chemical processes. These substitutes provide the necessary repellency function without relying on specialized fluorinated compounds, making the solution both environmentally friendly and economically viable.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Object-affected harmful factors

If fluorine-free and silicone-free additives are used, then environmental compliance is improved, but water repellency performance may worsen

Engineering Contradiction:

Improveenvironmental complianceVSAvoidwater repellency

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent carefully adjusts the molecular structure parameters of the fluorine-free additives by specifying aromatic esters with long alkyl chains (R1, R2, R3, and R4 being independently a 12 to 50 carbon alkyl group). These structural parameters are optimized to achieve ultra-repellent surfaces with low hysteresis, matching or exceeding the performance of fluorinated alternatives while maintaining environmental compliance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite molecular structure combining aromatic ester cores with long alkyl chain substituents. This composite structure leverages the hydrophobic properties of the long alkyl chains while the aromatic core provides structural stability, achieving superior water repellency without fluorinated compounds.

Inventive Principle:

Principle #40Composite materials

3Reliability

If long-chain alkyl aromatic esters are used as additives, then low hysteresis water repellency is achieved, but additive molecular complexity increases

Engineering Contradiction:

Improvelow hysteresis water repellencyVSAvoidadditive molecular structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent optimizes the molecular parameters by defining specific ranges for the alkyl chain lengths (12 to 50 carbons) and the aromatic ester core structure. These parameter specifications balance the need for low hysteresis water repellency with manageable molecular complexity, ensuring the additives remain synthetically accessible and processable while achieving ultra-repellent performance.

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

These additives effectively provide low hysteresis water repellency to thermoplastic articles, enabling the creation of ultra-repellent surfaces while minimizing environmental impact and avoiding regulatory issues related to fluorinated compounds.

Implementation Method 1

fluorine-free and silicone-free small molecule additives of structure (I) ... for use in low hysteresis water repellent applications such as, for example, ultra-repellent surfaces

Methodology Applied

Scientific EffectSurface energy reduction: Surface Tension

Implementation Method 2

where each of R1, R2, R3, and R4 is independently a 12 to 50 carbon alkyl group ... impart water repellency

Methodology Applied

Scientific EffectHydrophobic effect: Hydrophobe

Data Source

PatentUS20250034356A1Compositions for use in low surface-energy applications

Publication Date: 2025.01.30 3M INNOVATIVE PROPERTIES CO

AI summary

Fluorine-free and silicone-free small molecule additives of structure (I) where each of R1, R2, R3, and R4 is independently a 12 to 50 carbon alkyl group, optionally a 14 to 40 carbon alkyl group, or optionally an 18 to 30 carbon alkyl group for use in solid-state formulations, e.g., thermoplastic articles, for use in low hysteresis water repellent applications such as ultra-repellent surfaces. Methods of preparing such compositions and additives are provided.