Skin Nutrition Wiki ยท Ingredient encyclopedia
Polyquaternium-10
A conditioning ingredient does not have to be an oil. Polyquaternium-10 is a modified cellulose polymer that can attach to hair surfaces. Its story is about a long chain, electrical charge and what a formula leaves behindโnot feeding a hair follicle. [1]
INCI: Polyquaternium-10 ยท Family: cationic cellulose derivative ยท Focus: hair conditioning
A chain with positively charged sites
Start with hydroxyethylcellulose, a chemically modified cellulose. Adding quaternary ammonium groups gives the polymer positive charge: that is what cationic means. Polyquaternium-10 is not plain cellulose, a protein or a silicone. [1]
The circles represent a modified cellulose chain. The plus signs mark selected positively charged groups. This teaching sketch is not a bond-by-bond structure, exact substitution pattern or molecular-weight specification.
Think of adsorption as attachment at a surface. It is different from absorption into the interior. That distinction matters when a surface deposit changes how hair behaves.
One ingredient name does not mean one chain size
In a 2007 formulation study, Huisinga and Lochhead varied polymer structure and solution conditions. Within the Polyquaternium-10 series, higher molecular weight and/or charge density generally produced more coacervate: a separated, polymer-and-surfactant-rich phase. [2]
Chain size
A molecular-weight difference describes the scale of the polymer chains, not a different amount poured into the bottle.
Charge density
This describes how much electrical charge the polymer carries relative to its size. It is a different variable from chain length.
Why โmoreโ is not automatically โbetterโ
The researchers used high-throughput formulation screening, not a consumer hair trial. Salt addition order also influenced coacervation. More separated material is a measured formulation outcome, not proof of better detangling, lighter feel or superior performance on every hair type. This account uses the study abstract.
Rinsing changes the mixture
Hiranuma and colleagues studied diluted model shampoos containing Polyquaternium-10 and different amino-acid-based surfactant systems in 2026. Their collected precipitates differed in composition, water content and mechanical behavior. Some contained both coacervates and surfactant assemblies called premicellar aggregates. [3]
Starting mixture
Polymer + surfactants
The ingredient has partners, not an isolated setting.
Dilution
Water changes conditions
The mixture can reorganize as it becomes more dilute.
Measured material
Different aggregates
Composition and resistance to deformation can differ.
What did the new experiment actually measure?
Composition analysis, microscopy, electrical-potential measurements and rheology characterized the separated material. The authors included Kawaken Fine Chemicals researchers. The study helps explain formulation behavior; it does not show that every Polyquaternium-10 shampoo repairs hair or performs identically.
Following silicone through repeated washes
Gruber and colleagues used X-ray fluorescence to follow dimethicone on virgin brown hair tresses in 2001. Their model shampoos differed by the presence or absence of Polyquaternium-10. Without the cationic polymer, silicone accumulated over repeated washes; with it, deposition stayed relatively constant in the tested systems. [4]
The ingredient being tracked
Dimethicone: the silicone oil remaining on the hair.
The ingredient changing the result
Polyquaternium-10: the cationic polymer included in the shampoo.
What canโand cannotโbe concluded?
Higher polymer molecular weight increased silicone deposition in these experiments. That is a useful example of grade-dependent behavior, not a universal โno buildupโ promise. The study measured deposition, not structural repair or hair growth. Amerchol was the listed affiliation. The original abstract, rather than the full paper, was inspected.
A useful conditioner, not an automatic winner
Hรถssel and colleagues compared several cationic polymers in sulfate-based shampoos. Combing-force measurements, sensory assessments and surface analyses all contributed to the comparison. The tested polymers improved overall shampoo performance, but Polyquaternium-10 did not match Polyquaternium-44 for wet combability and some sensory criteria. [5]
Polyquaternium-10 could also be removed by rinsing with anionic surfactant in that work. These are results for particular tested materials and formulasโnot a permanent ranking of every product bearing those ingredient names.
Read the comparison in context
The authors were affiliated with BASF; the study compared Polyquaternium-10 with the then-new Polyquaternium-44 material. This summary is based on the abstract. It is evidence about measured conditioning performance, not a clinical trial or a reason to assume every higher-numbered polyquaternium is better.
Keeping safety and performance separate
CIR reaffirmed its earlier safety conclusion for Polyquaternium-10 in its 2008 review, within the assessed cosmetic uses and concentrations. This is an ingredient safety assessment, not regulatory approval of every formula or a guarantee of individual tolerance. [6]
What the label can tell you
The name identifies a conditioning polymer. It does not reveal the grade, deposited amount or complete wash-and-rinse behavior. Judge claims against the finished product and the outcome actually tested: easier combing, a measured deposit and repaired internal structure are different claims.
Sources & evidence notes
No hair, scalp or finished-product testing was performed for this entry. The recent mechanistic paper was read in full; the three older experimental studies were reviewed through their original abstracts.
[1] CIR (1988). Polyquaternium-10 assessment: identity and uses. DOI: 10.3109/10915818809023135.
[2] Huisinga & Lochhead (2007). Polymer structure, coacervation and electrolyte addition. DOI: 10.1021/bk-2007-0961.ch005.
[3] Hiranuma et al. (2026). Coacervates and premicellar aggregates in amino-acid surfactant systems. DOI: 10.5650/jos.ess26077.
[4] Gruber et al. (2001). X-ray fluorescence measurement of silicone deposition from shampoo. PMID: 11382849.
[5] Hรถssel et al. (2000). Conditioning-polymer efficacy and test methods. DOI: 10.1046/j.1467-2494.2000.00003.x.
[6] CIR (2008). Safety-review reaffirmation, Polyquaternium-10 section.
