Esterquat, Dialkylester Ammonium Methosulfate, Triethanolamine Diesterquat Methosulfate, 91995-81-2

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Esterquat, Dialkylester Ammonium Methosulfate, Triethanolamine Diesterquat Methosulfate, 91995-81-2

ESTERQUAT (ESTER QUATERNARY AMMONIUM SALT)

CAS 91995-81-2 | EC 295-344-3

SECTION 1: PRODUCT IDENTITY AND DEFINITION

Parameter	Description
Product Name	Esterquat
Other Names	Ester Quaternary Ammonium Salt, Dialkyl Ammonium Methosulfate, Esterquart, Di(tallow-carboxyethyl)hydroxyethylmethylammoniummethylsulfate, Triethanolamine Diesterquat Methosulfate
CAS Number	91995-81-2
EC Number (EINECS)	295-344-3
INCI Name	Dialkylester Ammonium Methosulfate
Chemical Formula	Variable (C16/C18 fatty acid based)
Chemical Class	Cationic Surfactant / Quaternary Ammonium Salt
Appearance	White to Yellowish Waxy Paste/Solid
Ionic Type	Cationic
Source	Synthetic (C16/C18 fatty acids + Triethanolamine + Dimethyl Sulfate)

Description: Esterquat is a class of quaternary ammonium salts (QAS) containing ester linkages. It is primarily composed of triethanolamine diesterquat methosulfate based on C16/C18 saturated and unsaturated fatty acids. As a cationic surfactant, it adsorbs onto negatively charged surfaces (fabric, hair), providing excellent softening, antistatic, and conditioning properties. The ester linkages provide better biodegradability compared to conventional quaternary ammonium compounds.

SECTION 2: SYNONYMS AND OTHER NAMES

No	Synonym / Other Name
1	Esterquat
2	Ester Quaternary Ammonium Salt
3	Dialkyl Ammonium Methosulfate
4	Esterquart
5	Triethanolamine Diesterquat Methosulfate
6	Di(tallow-carboxyethyl)hydroxyethylmethylammoniummethylsulfate
7	Di(palmiticcarboxyethyl) Hydroxyethyl Methyl Ammonium Methylsulfate
8	Fatty acids, C10-20 and C16-18-unsatd., reaction products with triethanolamine, di-Me sulfate-quaternized
9	KAOSOFT HW
10	KAOSOFT AG80
11	STEPANTEX SP-90
12	TETRANYL AT60Q
13	ELOTANT EQ series
14	91995-81-2
15	EC 295-344-3

SECTION 3: CHEMICAL STRUCTURE AND PROPERTIES

Parameter	Description
Chemical Family	Cationic Surfactant / Quaternary Ammonium Salt
Structure	Hydrophobic alkyl chains (C16/C18) linked by ester bonds to a quaternary ammonium head group
Functional Groups	Quaternary Ammonium (N⁺), Ester (-COO-), Methosulfate (CH₃SO₄⁻)
Ionic Character	Cationic (positive charge)
Hydrophobic Chain	C16/C18 saturated and unsaturated fatty acids
Ester Bonds	2 ester bonds (diesterquat)
Counter Ion	Methosulfate (CH₃SO₄⁻)

Structural Formula (Representative):

    CH₂ - OOC - R
    |
    CH - OOC - R
    |
    CH₂ - N⁺ - CH₃  CH₃SO₄⁻
         |
        CH₂ - CH₂ - OH

    Triethanolamine Diesterquat Methosulfate (R = C16/C18 alkyl chain)

Key Characteristics:

Cationic quaternary ammonium surfactant
Ester-containing "cleavable" structure
Better biodegradability than conventional quaternary ammonium compounds
Dispersible in hot water
Soluble in isopropanol
Low yellowing effect
Excellent softening and antistatic properties

SECTION 4: PHYSICAL AND CHEMICAL PROPERTIES

Parameter	Specification	Typical Value	Test Method
Physical State (25°C)	Paste/Solid	-	Visual
Appearance	White - Yellowish	-	Visual
Odor	Slight characteristic / Isopropanol-like	-	Organoleptic
Density (20°C)	~0.96 g/cm³	-	ASTM D4052
Melting Point	~36°C	-	DSC
Flash Point	~60.5°C	-	ASTM D93
pH (5% Aqueous)	2.0 – 4.0	2.5 – 3.5	USP <791>
Solids Content	≥ 90%	92 – 98%	105°C/2 hrs
Volatile Matter	7.0 – 22.0%	-
Water Content	< 1%	-	Karl Fischer
Color (Gardner)	≤ 4.0	< 3.0	ASTM D1544
Water Solubility	Dispersible	-
Acid Value	≤ 5.0 mg KOH/g	< 3.0	Titration
Amine Value	≤ 5.0 mg KOH/g	< 3.0	Titration

SECTION 5: HYDROLYSIS STABILITY

Parameter	Description
Hydrolysis Sensitivity	Sensitive to hydrolysis due to ester bonds
pH Effect	Stable at acidic and neutral pH; hydrolysis accelerates at alkaline pH
Temperature Effect	High temperature accelerates hydrolysis
Optimum pH Range	3.0 – 5.0
Recommended Storage Temperature (Molten)	50 – 55°C (do not exceed 55°C)
Warning	High temperatures cause color loss and solvent loss

SECTION 6: FUNCTIONAL PROPERTIES

Property	Description
Softening	Excellent softening effect on fabrics and hair
Antistatic	Effectively reduces static electricity
Conditioning	Provides conditioning for hair and fabrics
Biodegradability	Superior biodegradability (environmentally friendly)
Low Yellowing	Very low yellowing effect
Rewettability	Good water absorption on softened fabrics
Dispersion	Good dispersibility in hot water
High Viscosity	Provides high viscosity in concentrated formulations
Plant-Based Source	Palm oil-based options available

SECTION 7: COSMETIC AND PERSONAL CARE APPLICATIONS

Application	Function / Benefit	Typical Use Level
Hair Conditioners	Conditioning, antistatic, softener	1.0 – 5.0%
Shampoos	Conditioning, antistatic	0.5 – 2.0%
Hair Masks	Deep conditioning, softening	1.0 – 3.0%
Hair Dyes	Conditioning, color retention	1.0 – 2.0%
Creams and Lotions	Emulsifier, emollient	0.5 – 2.0%
Moisturizers	Emollient, moisturizer	0.5 – 2.0%
Sunscreens	Emulsifier, emollient	0.5 – 2.0%
Toothpastes	Surfactant	0.5 – 1.5%

SECTION 8: FABRIC SOFTENER APPLICATIONS

Application	Function / Benefit	Typical Use Level
Laundry Softeners	Primary softener, antistatic	5 – 20%
Concentrated Softeners	Primary softener	15 – 30%
Textile Auxiliaries	Softening, antistatic	1 – 5%
Fabric Sprays	Softener, antistatic	1 – 5%
Dryer Sheets	Softener, antistatic	5 – 15%

Advantages in Fabric Softeners:

Excellent softening effect on fabrics
Good rewettability
Biodegradable
Low yellowing effect
Provides high viscosity
Suitable for cold mixing (palm-based variants)

SECTION 9: INDUSTRIAL APPLICATIONS

Industry	Application	Function / Benefit
Textile Industry	Fiber softener, antistatic agent	Softens fibers, reduces static electricity
Detergents	Surfactant, softener	Cleaning and softening
Paper Industry	Softening and isolation paper	Softens paper, provides isolation properties
Fuel Additives	Antistatic additive	Prevents static electricity
Paints and Coatings	Emulsifier, dispersant	Pigment dispersion

SECTION 10: ADVANTAGES AND BENEFITS

Advantage	Description
Excellent Softening	Superior softening effect on fabrics and hair
Biodegradable	Environmentally friendly; better biodegradability than conventional quaternary ammonium compounds
Low Yellowing	Very low yellowing effect
High Activity	Cost advantage due to high activity
Concentrated Formulation	Suitable for concentrated softener production
Good Rewettability	Good water absorption on softened fabrics
Antistatic	Effectively reduces static electricity
Plant-Based Source	Palm oil-based options available
Cold Mixing	Suitable for cold mixing process (selected products)
High Viscosity	Provides high viscosity in concentrated formulations

SECTION 11: COMPARISON WITH OTHER SOFTENING AGENTS

Property	Esterquat	DHTDMAC	Imidazolinium Salts
Softening	Excellent	Excellent	Good
Biodegradability	Good (cleavable)	Poor (persistent)	Moderate
Yellowing	Low	Moderate	Low
Rewettability	Good	Poor	Moderate
Environmentally Friendly	Yes	No	Partially
Concentrated Formulation	Suitable	Limited	Suitable

SECTION 12: FORMULATION TIPS

Parameter	Recommendation
Use Level	5 – 20% (fabric softeners)
pH Range	3.0 – 5.0 (optimum stability)
Temperature	50 – 55°C (melting); do not exceed 55°C
Water Quality	Soft water preferred (hard water reduces viscosity)
Additives	Compatible with perfumes, colorants, preservatives
Mixing	Low shear mixing recommended
Cold Mixing	Palm-based variants suitable for cold mixing
Pre-Dissolving	Pre-dissolving in hot water recommended
Container Material	Stainless steel or rubber-lined steel

SECTION 13: REGULATORY STATUS

Region / Authority	Status	Description
European Union	Permitted	Cosmetic and detergent ingredient
Turkey	Permitted	Compliant with EU legislation
USA (FDA)	Permitted	For specific uses
REACH	Registered	EU chemical regulation compliance
TSCA	Listed	US Toxic Substances Control Act
EINECS	295-344-3	European Inventory of Existing Chemical Substances

SECTION 14: SAFETY AND TOXICOLOGICAL PROFILE

Parameter	Assessment
Acute Oral Toxicity	Low toxicity
Acute Dermal Toxicity	Low toxicity
Skin Irritation	Mild – Moderate irritant
Eye Irritation	Irritating
Skin Sensitization	Low potential
Biodegradability	Biodegradable
Aquatic Toxicity	Low – Moderate

GHS Classification:

H315 – Causes skin irritation
H319 – Causes serious eye irritation
H335 – May cause respiratory irritation

Safety Recommendations:

S26: In case of eye contact, rinse with plenty of water and seek medical advice
S36/37: Wear suitable protective clothing and gloves
PPE: Chemical resistant gloves, safety goggles
Be careful of temperature burns when working with molten product

SECTION 15: STORAGE AND SHELF LIFE

Parameter	Information
Storage Temperature (Solid)	15 – 30°C (cool, dry)
Storage Temperature (Molten)	50 – 55°C
Maximum Temperature (Long-term)	Do not exceed 55°C
Storage Conditions	Well-ventilated, moisture-protected area
Container Requirements	Stainless steel or rubber-lined steel containers
Protect From	Excessive heat, moisture, contamination
Shelf Life	12 – 24 months (under proper storage)
Degradation Signs	Color change, odor change, viscosity change
Warning	High temperatures cause color loss and solvent loss

Packaging Options:

25 kg HDPE pails
50 kg, 100 kg drums
190 kg drums
1000 kg IBC containers
Bulk tanker deliveries

SECTION 16: TRANSPORTATION AND SHIPPING

Parameter	Description
UN Number	Not regulated (non-hazardous)
Hazard Class	Not classified
Packing Group	Not applicable
Marine Pollutant	No
Transport Temperature	Ambient temperature (15-30°C)
Transport Precautions	Protect from excessive heat and moisture; temperature control for molten product

SECTION 17: QUALITY CERTIFICATES AND STANDARDS

Certificate / Standard	Status	Description
ISO 9001:2015	Certified	Quality management system
ISO 14001:2015	Certified	Environmental management system
REACH	Registered	EU chemical regulation compliance
TSCA	Listed	US Toxic Substances Control Act
EINECS	295-344-3	European Inventory of Existing Chemical Substances
Certificate of Analysis (COA)	Provided with each batch	Includes binding specifications
Safety Data Sheet (SDS)	Available	Current 16-section document
Technical Data Sheet (TDS)	Available	Comprehensive technical information
GMP	Compliant	Manufacturing quality standards

SECTION 18: FREQUENTLY ASKED QUESTIONS (FAQ)

Q1: What are the advantages of Esterquat?
A: Esterquat offers better biodegradability, low yellowing, and good rewettability compared to conventional quaternary ammonium compounds.

Q2: Is Esterquat biodegradable?
A: Yes, ester linkages make it biodegradable (cleavable).

Q3: In which pH range is Esterquat stable?
A: Esterquat is stable at acidic and neutral pH (3.0-5.0). Ester bonds hydrolyze at alkaline pH.

Q4: What is the typical use level of Esterquat in fabric softeners?
A: Typically used at 5-20% concentrations in fabric softener formulations.

DISCLAIMER (LEGAL NOTICE): This Technical Data Sheet (TDS) is for informational purposes only and does not constitute a binding specification. The values stated herein are based on typical laboratory results. The user is solely responsible for determining the suitability of the product for the intended application and for ensuring compliance with all local regulations. A current Safety Data Sheet (SDS) and Certificate of Analysis (COA) should be requested prior to use. May cause skin and eye irritation; appropriate protective measures should be taken. This document does not grant any license or patent rights for use of the product.