Alkanolamides are the amide products formulators actually put in drums: coco MEA, coco DEA, and lauric MEA. They are not primary detergents. They are the small percentage that turns a thin, fast-breaking foam into a creamy, salt-efficient gel. This guide treats them as a class—how amidification sets the grade, where they belong in shampoo versus dish versus laundry, and how to process solids without grainy haze.
What Alkanolamides Are
An alkanolamide is a fatty acid amide whose nitrogen substituent still carries an alcohol group (from MEA or DEA). Manufacture is amidification: coconut or lauric acid plus alkanolamine, water stripped, composition frozen as a 1:1 superamide or a more liquid excess-amine grade. CAS anchors used on Esteem pages include 68140-00-1 (cocamide MEA), 68603-42-9 (cocamide DEA), and 142-78-9 (lauramide MEA).
They are nonionic co-surfactants. Cleaning power still comes from anionic surfactants. Pearl often comes from glycol esters such as EGDS. Do not confuse them with CAPB, which is amphoteric; both may sit in the same formula.
Grade Map
| Grade | Amine | Typical form | Strengths | Watch-outs |
|---|---|---|---|---|
| CMEA | MEA | Flake / solid | Creamy foam, viscosity, modern PC preference | Must melt; haze in ultra-clear systems |
| CDEA | DEA | Often liquid | Easy cold process, strong foam/viscosity | DEA residual, nitrosamine policy |
| Lauramide MEA | MEA | Solid | Narrower C12 cut, sometimes cleaner foam | Cost vs whole coconut; melt still required |
Deeper CMEA-only notes already exist: applications, foam and viscosity role, and CMEA/CDEA in soaps and detergents. Use this page when you are choosing among amide types rather than justifying CMEA alone.
Foam Quality vs Foam Volume
Alkanolamides rarely win a Ross-Miles height contest against extra SLES. They win the sensory test: smaller bubbles, slower collapse, better “cushion” during massage. That film stability also helps dishwashing liquids keep foam in greasy water a little longer. If the brief is only flash foam for a cheap shampoo, spend first on anionic and CAPB; add CMEA when the marketing line says creamy or when salt alone cannot reach viscosity.
Industrial foamers (oilfield, firefighting) are a different chemistry set—hydroxysultaines and dedicated foaming agents such as Foamer HS. Do not specify shampoo CMEA for air-mist drilling.
Viscosity and the Salt Curve
In SLES/CAPB systems, CMEA shifts the salt curve: you often hit target viscosity at lower NaCl and with a wider plateau. In LAS dish liquids, alkanolamides similarly build body so the product clings to a sponge. In sulfate-free washes, amide thickening still helps but rarely replaces a polymer; plan a dual system.
Always plot viscosity vs NaCl after an amide swap. The “same 2% CMEA” from two suppliers can differ in free amine and mono/di by-products enough to move the peak. Related: shampoo salt-curve discussion and viscosity builders.
Where Alkanolamides Are Used
- Personal care — shampoo, body wash, facial cleanser, liquid soap. See personal care chemicals.
- Home care — hand dish, laundry paste/liquid, some toilet and hard-surface products where foam aesthetics matter. See home care chemicals.
- Industrial detergents — concentrates that must stay viscous without huge salt loads.
- Textile auxiliaries — occasional foam or lubricity roles; not a substitute for ethoxylate scouring agents.
Pearlized shampoos often combine CMEA (structure for crystal suspension) with EGDS (the pearl). Process order matters: melt amide and pearlizer in the right window, crystallize, then salt. See pearlizing agents.
Grade Map and Policy Gates
Start from the published amide list, then apply market policy. Personal care export: prefer CMEA and document residual amine; avoid silent CDEA substitution. Homecare cold-process dish: liquid CDEA may still be allowed—keep a written approved list. Liquid CMEA – 3,5 EO Moles bridges cold process when DEA is banned.
Oleic and stearic diethanolamides are specialty cuts for specific foam or body profiles—not automatic CDEA twins. Coco Fatty Acid Aminoethyl Ethanolamide 6EO is a separate ethoxylated amide architecture; trial it only when the brief names that chemistry.
Foam Film, Salt Curve, and Pearl
Alkanolamides win creamy foam-film stability more than Ross-Miles height. Pair with Coco Betaine (35) for volume and mildness. Viscosity: CMEA shifts the SLES salt curve so you often hit target at lower NaCl. Always re-plot after a supplier or assay change.
Pearlized shampoo: CMEA helps suspend EGDS platelets; process melt and cool windows from the pearlizing guide still apply. Haze in “clear” SKUs usually means amide overdose, fast cool, or incompatible fragrance—drop dose or move to a more soluble liquid amide if policy allows.
Industrial detergent concentrates use amides to cling without huge salt loads. Textile and oilfield foam jobs are different chemistries—do not copy shampoo CMEA into those RFQs. Share chassis, residual-amine limits, and market when requesting amidification grades from Esteem.
Processing and Troubleshooting
- Grainy or undissolved flakes — temperature too low or hold time too short. Melt completely before cooling.
- Haze in “clear” shampoo — amide level too high, cool too fast, or incompatible fragrance. Drop dose or switch to a more soluble liquid amide if policy allows.
- Viscosity crash on storage at 40 °C — near the salt-curve peak; back off NaCl or amide slightly.
- Poor foam in hard water — amide is not a builder. Add chelant; consider CAPB for extra tolerance.
- Regulatory hold — if DEA is banned in the SKU’s market, do not “fix” CMEA shortages with CDEA.
Specify amide assay, free amine, acid value, melting range, colour, and residual DEA. Esteem Industries can align amidification grades with your chassis. Request a sample with SLES/LAS level, target viscosity, and whether the formula is pearl, clear, or sulfate-free.
If cold process is mandatory, name CMEA – 3,5 EO Moles or another liquid amide on the request. If pearl is mandatory, pair the amide sample with your EGDS cool-down SOP so viscosity and shimmer are judged together.
Related selection page: CMEA vs CDEA vs CAPB when the brief is a three-way co-surfactant choice rather than amide chemistry alone.
Esteem aligns amidification grades with your chassis when you send assay, free-amine, and clear-versus-pearl constraints with the sample request—not a generic “foam booster” label.
Document residual DEA and free amine on every COA lot. If an export market tightens DEA rules mid-project, switch the RFQ to CMEA or ethoxylated liquid CMEA before the next plant trial—not after the first bulk fill.
Keep Foamer CD/HS and oilfield foam briefs off this detergent amide page—those chemistries unload wells, they do not build shampoo salt curves.