Surfactant Composition for Stable Water-Resistant Polymer Emulsions

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Solution Overview

Problem

Existing reactive emulsifiers fail to provide polymer emulsions with adequate pressure-sensitive adhesive characteristics, mechanical stability, and water resistance.

Innovation Solution

A surfactant composition comprising a specific anionic surfactant and a specific nonionic surfactant in defined proportions, used in emulsion polymerization to produce a polymer emulsion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional reactive emulsifiers (with (meth)allyl ether groups or (meth)acrylic acid ester groups) are used, then emulsion polymerization can be performed, but the pressure-sensitive adhesive characteristics, mechanical stability, and water resistance of the resulting polymer emulsion are insufficient

Engineering Contradiction:

Improvepressure-sensitive adhesive characteristicsVSAvoidinsufficient adhesive characteristics with conventional emulsifiers

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the chemical structure parameters of the emulsifier by introducing a specific sulfonate group structure (Formula 1) with defined carbon atom ranges in the R1 and R2 groups. This structural parameter change fundamentally improves the pressure-sensitive adhesive characteristics, mechanical stability, and water resistance compared to conventional emulsifiers with (meth)allyl ether or (meth)acrylic acid ester groups.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite emulsifier system combining two different emulsifiers: a primary emulsifier with the specific sulfonate structure (Formula 1) and a secondary emulsifier with a different chemical structure. This composite approach synergistically enhances the polymer emulsion's adhesive characteristics, mechanical stability, and water resistance beyond what single emulsifiers can achieve.

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If conventional reactive emulsifiers are used, then polymer emulsion can be produced, but the mechanical stability of the polymer emulsion is insufficient

Engineering Contradiction:

Improvemechanical stabilityVSAvoidinsufficient mechanical stability with conventional emulsifiers

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The patent modifies the emulsifier structure parameters by incorporating the specific sulfonate group configuration in Formula 1, which directly enhances the mechanical stability of the polymer emulsion. The defined carbon atom ranges (C8-C15 for R1 and R2) and structural features create more stable micellar structures during polymerization, resulting in improved mechanical stability of the final emulsion product.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional reactive emulsifiers are used, then polymer emulsion can be produced, but the water resistance of the polymer emulsion is insufficient

Engineering Contradiction:

Improvewater resistanceVSAvoidinsufficient water resistance with conventional emulsifiers

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the hydrophobic-hydrophilic balance parameters of the emulsifier by using the specific sulfonate structure with defined alkyl chain lengths (R1 and R2 with C8-C15). This parameter optimization creates a more effective steric barrier and hydrophobic protection around the polymer particles, significantly improving water resistance compared to conventional emulsifiers.

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 surfactant composition results in a polymer emulsion with enhanced pressure-sensitive adhesive characteristics, mechanical stability, and water resistance.

Implementation Method 1

a surfactant composition comprising 95.5 mass % to 99.2 mass % of an anionic surfactant represented by the following general formula (1) with respect to a total amount of the surfactant composition; and 0.8 mass % to 4.5 mass % of a nonionic surfactant represented by the following general formula (2)

Methodology Applied

Scientific EffectSurfactant: Surfactant

Data Source

PatentUS20260028459A1Surfactant composition, composition for emulsion polymerization, method of producing polymer emulsion, and polymer emulsion

Publication Date: 2026.01.29 ADEKA CORP

AI summary

A surfactant composition including 95.5 mass % to 99.2 mass % of an anionic surfactant represented by formula (1) with respect to a total amount of the surfactant composition; and 0.8 mass % to 4.5 mass % of a nonionic surfactant represented by the following formula (2) with respect to the total amount of the surfactant composition; a composition for emulsion polymerization including the surfactant composition; a method of producing a polymer emulsion using the surfactant composition; and a polymer emulsion obtained by the production method using the surfactant composition:where R1 represents a linear or branched alkyl group having 8 to 15 carbon atoms, “m” represents a number of from 5 to 50, and M represents a hydrogen atom, an alkali metal atom, or an ammonium group; andwhere R2 represents a linear or branched alkyl group having 8 to 15 carbon atoms, and “n” represents a number of from 5 to 50.