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ACULYN 28 Rheology Modifier/Stabilizer, a very efficient thick-ener for a wide array of personal care formulations. 
ACULYN rheology modifiers find util-ity in an ever-increasing breadth of personal care applications because of their unique ease of use, wide compatibility, cost effectiveness and favorable balance of rheological properties.

ACULYN 28 Rheology Modifier/Stabilizer is an anionic associative rheology modifier developed specifically for hair and skin care applications. 
ACULYN 28 is a hydrophobically modified alkali soluble polymer emulsion (HASE) with unusually high aqueous thickening and stabilizing efficiency. 

ACULYN 28 is a liquid, cold-processable product that instantaneously thickens upon neutralization, providing ease of handling and increased manufacturing efficiency. 
ACULYN 28 is designed for clear formulations, stable from pH 5.5 to 10 and compatible with nonionic, anionic, Zwitterionic and some cationic ingredients, as well as peroxide and electrolytes. 
The lower pH neutralization makes ACULYN 28 ideal for skin care applications.

ACULYN 28 Rheology Modifier is a HASE-based rheology modifier and excellent polymeric emulsifier. 
ACULYN 28 is mild, soft, non-greasy, non-sticky and provides a refreshing watery feel. 

ACULYN 28 is easy to use in wide breadth of possible formulation and product types including gels, emulsions and clear solutions. 
ACULYN 28 provides sensory enhancement (light feel) and texture enhancement. 

ACULYN 28 is highly efficient to build apparent viscosity and excellent clarity at low pH. 
ACULYN 28 shows broad pH range stability and compatibility profile. 

ACULYN 28 is used in alcohol and glycol containing formulations, body washes, shower gels, crystal clear hair & skin care gels and two component hair dye systems (hair dye developers, perm neutralizers). 
ACULYN 28 Rheology Modifier is also suitable for hand and body lotions, liquid hand soaps, make-up creams, shampoos and sunscreen lotions.

ACULYN 28 is a Hydrophobically-modified Alkali Soluble Emulsion (HASE). 
HASE polymers are synthesized from an acid/acrylate copolymer backbone and a monomer that connects the hydrophobic groups as side chains. 

ACULYN 28 is made through emulsion polymerization.  
ACULYN 28 is synthesized from acrylic acid, acrylate esters and a beheneth-20 methacrylate ester. 

Benefits of ACULYN 28:
Easy to handle,
Compatible with nonionic, anionic, Zwitterionic and some cationic surfactants,
No preparation necessary,
Ability to stabilize suspensions,
Increased manufacturing efficiency,
Mild, soft, non-greasy, non-sticky,
Allows for use of continuous productionprocesses with use of in-line static mixers,
Stable in pH 5.5 to 12 formulations,
Thickens and stabilizes hydrogen peroxide,
Can be processed with membrane pumpsand, when diluted, with turbine mixers andhigh speed propellers,
Does not promote or support contamination,unlike natural thickeners•Able to formulate clear products,
Supported by comprehensive environmental,health and safety data,
Can be used with electrolytes,
Synergystic interaction with surfactants,particulates and hydrophobic raw materials,
Stabilization of hydrophobic (low solubility)components.

Features of ACULYN 28:
Broad pH range stability,
Instant neutralization/thickening,
Highly associative,
High surfactant synergy,
Higher efficiency/concentration ratio,
Synergistic rheology with inorganic clays,
Yields clear gels,
Very pseudoplastic,
Foam stabilizer,
High yield value,
Particulate stabilizer,
Salt tolerant,
Shear tolerant,
Peroxide compatible,
Formulation compatible,
Polar solvent compatible.

Applications of ACULYN 28:
Alcohol and glycol containing formulations•Body washes and shower gels,
Crystal clear hair care gels,
Crystal clear skin care gels,
Emulsifier free formulations,
Hand and body lotions,
Liquid hand soaps,
Make-up creams and lotions,
Sunscreen lotions,
Two component hair dye systems(hair dye developers, perm neutralizers).

Mechanism of Action 
ACULYN 28 rheology modifiers are able to thicken by two mechanisms that can act simultaneously and are synergistic, i.e. by the effect of charge-induced polyelectrolytic chain extension and by association of hydrophobe groups.  
When the acid groups present in the ACULYN 28 molecules are neutralized with inorganic bases or organic amines, they become anionically charged and water-soluble. 

ACULYN 28 thickens above pH 5.5. 
ACULYN 28 rheology modifiers dissolve and swell due to charge-charge repulsion.

When ACULYN 28 polymers swell, the pendant hydrophobic groups are free to build associations with one another and with other hydrophobes available in the formulation, such as surfactants, particulates, emulsion droplets and dyes. 
This phenomenon creates a network structure that results in a significant viscosity build.

Physical Properties of ACULYN 28:
Chemistry: HASE polymer
Association: very high
Ionic nature: anionic
Appearance: milky liquid
Solvent: water
Solids, %: 20
pH (as supplied): 3.0
Density: 1.01
Equivalent weight*: 253
Rheology: short, non stringy
Shear thinning: very high
Pseudoplastic index: 7.0
(viscosity @ 6 rpm/viscosity @ 60 rpm): ....(0.7% solids in water)
Acid number: 45 mg KOH/g
Transparency (0.7% solids @ pH 8.5): < 20 [NTU]
Viscosity, mPa s (as supplied): 20
Viscosity of 1% solids solution: 35,000 - 45,000 cps
(after 24 hrs @ pH 8.5, Brookfield RVT Spindle 7, 10 rpm)
INCI name: Acrylates/Beheneth-25 Methacrylate Copolymer

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