Hydrophilic polyoxyalkylene substituents, for controlled asso- ciation and enhanced rheological properties • Crosslinker The polymer’s optimised balance of hydrophilic, semi- hydrophobic and hydrophobic characters with amine function- ality further activates the ionic (cationic) characteristics at low pH (in use), while also helping to build viscosity through the mech- anisms of hydrodynamic thickening and controlled hydropho- bic association when the pH is reduced to <6.0 through the addition of an acid. This activates the ionic functionality of the polymer, causing the polymer to swell through charge repulsion (hydrodynamic volume expansion). Controlled hydrophobic association occurs via the combination of semi-hydrophobic and hydrophobic side chains at specific sites. Acidic ingredients used in personal care products (such as lactic, glycolic, salicylic, fruit acids and low pH salts) can serve both as active agents and acid swelling agents for the polymer to achieve the desired viscosity. Likewise, the proprietary modified hydrophobe package also f a c i l i t ates controlled associative thickening and provides enhanced rheological properties. This property clearly differen- tiates Carbopol Aqua CC polymer from typical associative poly- mers and makes it possible for formulators to create softer, smoother, more spreadable formulations with the shear-thin- ning rheology and suspension capabilities typical of other Carbopol polymers. Carbopol Aqua CC polymer offers a number of important benefits, including: low pH formulation stabilisation; cationic compatibility; excellent clarity; smooth flow and shear-thinning rheology; the ability to suspend beads, capsules and powders;
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