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Crop Care
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  1. Home
  2. Products & Applications
  3. Microemulsion (ME)

Microemulsions (ME)


MEs are water based formulations with a very small emulsified droplet size; this makes the formulation transparent.

They are thermodynamically stable over a wide temperature range due to this very fine droplet size, usually between 0.01 and 0.05 μm. Therefore in contrast to other emulsion systems, where the oil droplets can slowly coalesce causing phase separation, in ME formulations this does not occur.

The Formulator's Toolbox
The Formulator's Toolbox

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ME formulation diagram

Benefits

  • Thermodynamically stable therefore have increased shelf life
  • Low solvent level
  • Easy to transport and store
  • High flash point and safe handling
  • Improved bioefficacy due to the solubilisation of the active ingredient in the micro droplets
  • Low viscosity  so easier to handle

Limitations

  • Low active ingredient content
  • Require high surfactant level to form

Products Recommended For ME

  • Anionic Emulsifier
  • Non-ionic Emulsifier
  • Single Product Solution
  • Phosphate Esters
  • Solvent

Anionic Emulsifier

Anionic surfactants are required in an ME formulation to form a spontaneous emulsion. Due to the overall charge on an anionic emulsifier it provides additional electrostatic stabilisation.

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Atlox Metasperse™ 500L

Modified styrene acrylic polymer

A modified styrene acrylic polymeric aqueous dispersant in liquid form which exhibits excellent hard water tolerance.

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Atlox™ 4838B

Calcium alkylaryl sulphonate in solvent

An oil-soluble anionic emulsifier for improved stability and blooming of formulations upon dilution Commonly used as part of a triangle screen.....

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Zephrym™ 3300B

Amine alkylbenzenesulfonate

Anionic surfactant for EC and ME formulations

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Non-ionic Emulsifier

The combination of a low and high HLB non-ionic surfactant is recommended to provide steric stabilisation at the emulsion interface.

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SP Tween™ 22 MBAL

Polyoxyethylene (8) sorbitan monolaurate

A high HLB emulsifier and adjuvant applicable for both built-in and tank mix applications The significantly reduced equilibrium surface tension.....

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SP Tween™ 23 MBAL

Polyoxyethylene (12) sorbitan monolaurate

A high HLB emulsifier and adjuvant applicable for both built-in and tank mix applications Improved performance identified with various hydrophilic.....

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SP Tween™ 24 MBAL

Polyoxyethylene (16) sorbitan monolaurate

A high HLB emulsifier and adjuvant applicable for both built-in and tank mix applications Strong all round performing adjuvant and strategic.....

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Atlas™ G-5002L

Polyalkylene oxide block copolymer

A high HLB polymeric emulsifier or wetting agent in liquid form providing long term stability It is commonly used in combination with Atlox™ 4916.....

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Atlox™ 4916

High molecular weight polymer

A low HLB polymeric emulsifier and non-aqueous dispersant with a unique star structure which provides exceptional stability As an emulsifier it is.....

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Atlox™ 4914

Nonionic random polymeric

A nonionic random polymeric surfactant with low HLB value which can be used as an emulsifier or non-aqueous dispersant Multiple PEG anchoring groups.....

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Single Product Solution

Atplus 310 is a single product, emulsifier package. Its novel blend makes formulating an ME relatively easy and simple as blending ratios of the emulsifiers have already been predetermined. Microemulsions do not normally form in high electrolyte conditions. This is due to the disruption that electrolytes cause to steric stabilisation and the shielding effect to electrostatic repulsion between droplets. Atplus 310 however, is designed to overcome this problem and allows the formation of high electrolyte microemulsions.

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Atplus™ 310

Proprietary

Highly efficient single surfactant emulsifier package for high electrolyte microemulsions Allows the formation of a microemulsion of methylated seed.....

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Phosphate Esters

Our extensive range of phosphate esters gives the formulator a high degree of flexibility in their formulation design of microemulsions. When combined with other surfactants such as sarcosinates, they can provide stable microemulsion systems in very challenging conditions. As with the combination of non-ionic surfactants, it is important to consider pairing a phosphate ester with high solubility in your target aqueous system, along with a phosphate ester with high solubility in your target oil system.

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Atlox™ AL-3382

PEG-5 octyl phosphate

Phosphate ester designed for improved emulsion stability in high electrolyte conditions High cloud point of material gives strong performance as a.....

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Multitrope™ 1214

Polyoxyethylene alkyl ether phosphate

High mono ester high cloud point phosphate ester designed for improved emulsion stability in high electrolyte conditions Ideally partnered with.....

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Solvent

In an ME formulation the active ingredient must be fully soluble in the carrier solvent. If the active ingredient is solid, it will need to be dissolved in a solvent. Croda’s Seatons Natural Oil range are 100% natural and renewable, which make them a great choice for use in crop care formulations.

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Seatons refined linseed oil

Linseed oil

Seatons refined linseed oil is a simple and effective alternative to mineral oil It is non-flammable impurity free and has good compatibility with.....

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Seatons refined rapeseed oil

Rapeseed oil

Seatons refined rapeseed oil is a simple and effective alternative to mineral oil It is non-flammable impurity free and has good compatibility with.....

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Seatons refined soyabean oil

Soyabean oil

Seatons refined soyabean oil is a simple and effective alternative to mineral oil It is non-flammable impurity free and has good compatibility with.....

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Formulation Finder

Formulation Finder

Browse our range of fully developed formulations for inspiration and guidance.

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The Formulator's Toolbox

The Formulator's Toolbox

View our in-depth training guides about how to develop different formulation types.

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Experimental Design Tool

Experimental Design Tool

This tool enables you to methodically calculate surfactant ratios meaning the number of experiments are kept to a minimum.

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  • Adjuvants
  • Capsule Suspension (CS)
  • Concentrated Aqueous Emulsion (EW)
  • Emulsifiable Concentrate (EC)
  • Flowable Concentrates for Seed Treatment (FS)
  • Oil Dispersion (OD)
  • Suspension Concentrate (SC)
  • Suspoemulsion (SE)
  • Water Dispersible Granule (WDG)
  • Wettable Powder (WP)
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Crop Care

With our industry-leading technologies and unique formulation expertise, our unmatched range of additives and adjuvants help crop customers get the best performance out of their products, enabling farmers to get the best yields from their crops.

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