Fatty acid esters are products of fatty acids with alcohols other than glycerol-only or PEG-only specialities — for example isopropyl esters, butyl esters, methyl esters, 2-ethylhexyl esters and specialty alkyl esters of oleic, stearic, palmitic, lauric or mixed coconut acids. They are used as emollients, lubricants, solvents, plasticisers and intermediate fluids.
What fatty acid esters are
Fatty acid esters are products of fatty acids with alcohols other than glycerol-only or PEG-only specialities — for example isopropyl esters, butyl esters, methyl esters, 2-ethylhexyl esters and specialty alkyl esters of oleic, stearic, palmitic, lauric or mixed coconut acids. They are used as emollients, lubricants, solvents, plasticisers and intermediate fluids. Dyna Glycols manufactures them to agreed acid value, SAP, hydroxyl (if a partial ester), colour and pour point.
Unlike ethoxylates they are not primarily surfactants, though some polar esters assist spreading. The value is a defined viscosity, freeze point, polarity and lubricity from a chosen acid–alcohol pair. Personal care, metal working, textile finishes, leather and industrial fluids all specify named fatty acid esters.
How Dyna Glycols manufactures fatty acid esters
Esterification is run to a low residual acid value with colour control and removal of water of reaction. Feedstock acid and alcohol are named on the batch record so the COA matches the intended carbon numbers.
Custom pairs (for example oleate of a specified alcohol, or a mixed coconut ester) are quoted from saponification target, viscosity and pour point rather than from a surfactant HLB.
Typical grades in this range
Identify the acid, the alcohol and the residual acid-value window.
- Isopropyl, butyl, methyl and 2-ethylhexyl esters of common fatty acids
- Oleate, stearate, palmitate, laurate and coconut mixed esters
- Custom viscosity and pour-point cuts for lubricant and emollient duty
Where fatty acid esters are used
Personal care uses isopropyl myristate/palmitate-type esters and related fatty acid esters as light emollients. Industrial lubricants and metal-working fluids use oleates and mixed esters for oily lubricity with better low-temperature flow than some triglycerides.
Textile fibre finishes and leather fatliquor oil phases use fatty acid esters as carriers and softeners. Coatings and inks use selected esters as coalescents or plasticising solvents.
Biodiesel-type methyl esters are a different duty; if the need is a surfactant, see fatty acid ethoxylates or PEG esters instead of this family.
How to specify fatty acid esters
Name the fatty acid, the alcohol, maximum acid value, colour, moisture and pour point. Include viscosity at a stated temperature if the ester is a lubricant.
For cosmetic emollients, add odour and a preferred carbon-cut if the existing grade is a named INCI.
Quality, documents and supply
Lots are released against acid value, SAP, colour, water and appearance, plus viscosity or pour point when specified. SDS and COA follow verification. Samples support lubricity, feel or solvency tests.
Keep containers dry. Hydrolysis slowly raises acid value in the presence of water, especially at heat.
Practical notes on fatty acid esters
Saponification value confirms the ester equivalent weight. It should sit in a narrow band around the theoretical value for the named pair.
Iodine value matters for oleates and other unsaturated esters: it affects drying, odour and oxidation. Hydrogenated acids give more stable, higher-melt esters.
Pour point can be tuned by blending acid cuts. Winter-grade lubricant esters should specify pour point on the purchase order.
Dyna Glycols manufactures related glyceryl, glycol and PEG esters. Choose this fatty-acid-ester page when the alcohol is not glycerol, glycol or polyethylene glycol.
Flash point and packaging for transport should be confirmed for low-molecular-weight esters such as methyl or isopropyl cuts.
A first sample request should include the INCI or chemical name, not only “ester”, so the correct acid–alcohol pair is made.
Ordering and evaluating fatty acid esters
Send the application, the analytical window and the pack size when you request a laboratory sample of fatty acid esters. SDS, TDS and COA follow a short company check. Handle and store the grade as the SDS describes.
Next step
Need a specification for this chemistry?
Tell us the substrate, EO/PO moles and the application. We will confirm a catalogue grade or a custom batch.