Hexanedioic acid, polymer with oxybis[propanol] (CAS 64091-34-5) — Citrus Fixative Note Fragrance Ingredient
Hexanedioic acid, polymer with oxybis[propanol]
CAS 64091-34-5
What Is Hexanedioic acid, polymer with oxybis[propanol]?
Hexanedioic acid polymer is a synthetic ingredient used as a fixative in modern perfumes. It helps fragrances last longer by slowing the evaporation of volatile components. This odorless polymer is valued for its ability to enhance longevity without altering scent profiles, making it a behind-the-scenes workhorse in fragrance formulations.
Safety Profile
GENERALLY SAFEWhat Does Hexanedioic acid, polymer with oxybis[propanol] Smell Like?
This polymer is completely odorless, serving purely as a functional ingredient rather than a scent contributor. As a fixative, it works silently in the base of fragrances, forming an invisible molecular net that traps more volatile aroma molecules. Its effect becomes noticeable only in the dry-down phase, where it prevents rapid dissipation of the fragrance’s character.
2D Molecular Structure
SMILES: OCCCOCCCO.OC(=O)CCCCC(O)=O
Chemistry, Properties & Perfumer Guide
The Chemistry
Hexanedioic acid polymer with oxybis[propanol] is a synthetic polyester formed through condensation polymerization. The polymer backbone consists of repeating adipic acid units linked by ether-containing diol spacers. This structure creates a flexible polymer matrix capable of interacting with fragrance molecules through weak intermolecular forces. The polymer’s molecular weight distribution determines its fixative properties, with higher molecular weight fractions providing stronger retention effects.
Physical & Chemical Properties
| Appearance | Colorless solid |
|---|---|
| Solubility | Soluble in alcohol |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-3% | 0.5-5% | Base note fixative |
| Functional Fragrances | 0.5-2% | 0.1-3% | Longevity enhancer |
Classic Accords
Tip: Use in ethanol-based perfumes for optimal solubility and performance.
Alternatives & Comparisons
Alternative polymeric fixative with different solubility profile and molecular retention characteristics.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not restricted by IFRA
RIFM Assessment
No specific RIFM assessment required for this polymer.
Sustainability
As a synthetic polymer, this material is produced through controlled chemical processes with minimal environmental impact. Its efficiency as a fixative reduces the need for higher concentrations of other ingredients, contributing to more sustainable fragrance formulations. The polymer is not biodegradable but is used in such small quantities that disposal is not a significant environmental concern.
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Perfumer’s Notes
Ingredient Data Sheet
CAS 64091-34-5Physical data: PubChem (NIH/NLM), U.S. EPA CompTox Dashboard, EPA OPERA models, RDKit. Odor & flavor: Arctander (Perfume & Flavor Chemicals), Fenaroli's Handbook of Flavor Ingredients, Leffingwell. Thresholds: van Gemert (Compilations of Odour Threshold Values). Regulatory: IFRA Standards 51st, FEMA GRAS. Trade names: Surburg (Common Fragrance & Flavor Materials). All data compiled and cross-referenced for perfumertools.com.
Physicochemical Properties
DTXSID: DTXSID10982585
Physical Properties
| Molecular Weight | 280.317 g/mol🔬 EPA CompTox |
| Boiling Point | 261 °C📊 OPERA |
| Melting Point | 157 °C📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 0.79 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | -0.51 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 0.7 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 7.6 Log10 unitless📊 OPERA |
| Water Solubility | 6.166 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0 mmHg📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 124.29 Ų💻 Computed |
| H-Bond Donors | 4 count💻 Computed |
| H-Bond Acceptors | 5 count💻 Computed |
| Rotatable Bonds | 11 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
Data Sources:
🔬 EPA Experimental data from U.S. EPA CompTox Chemicals Dashboard & CTX APIs. 📊 OPERA Predicted using EPA's OPERA QSAR models. 💻 Computed Calculated from SMILES using RDKit.
