Carbomer 980 is a cross-linked polyacrylic acid polymer designed to offer similar high-performance characteristics to Carbomer 940 but with a toxicologically preferred solvent system. It is considered the industry standard "benzene-free" alternative for applications requiring high viscosity and brilliant clarity. Like Carbomer 940, it provides efficient thickening and suspending properties with short-flow rheology. However, it is synthesized without the use of benzene, making it exceptionally suitable for modern personal care formulations, pharmaceutical gels, and products adhering to strict solvent residue regulations. It delivers a smooth, luxurious skin feel and is compatible with high levels of solvents like ethanol.

Chemical Properties

• Chemical Type: Anionic Rheology Modifier (Cross-linked Polyacrylate)

• Solubility: Hydrophilic; requires neutralization to dissolve fully. Note: It typically has a longer wetting time compared to Carbomer 940 due to its polymerization structure

• Appearance: Fine, white, fluffy powder

• Stability: Excellent stability in high-viscosity gels; shear-sensitive; sensitive to ionic content (salts); Benzene-free profile ensures regulatory stability in global markets

• Skin Feel: Non-tacky, light, and fresh; provides high clarity

Synthesis Methods

Synthesized via free-radical precipitation polymerization in a cosolvent system of ethyl acetate and cyclohexane. This process completely eliminates the use of benzene, complying with the strictest pharmacopeial and cosmetic safety standards.

Functions and Usages

• Safety & Compliance: The primary choice for formulations where solvent safety is critical (e.g., oral care, premium cosmetics)

• Efficient Rheology Control: Provides high viscosity thickening (40,000–60,000 cPs at 0.5%) and yield value to suspend beads or air bubbles

• Formulation Advantages:

• Direct Replacement: Functions as a "drop-in" alternative to Carbomer 940 in most recipes

• High Clarity: Creates sparkling clear gels, ideal for hair styling and sanitizers

• Solvent Compatibility: Excellent for hydroalcoholic systems (hand sanitizers)

• Typical Usage Level: 0.2% to 1.0%. Manufacturers should note that 980 may require modified dispersion techniques (slower addition or longer mixing) to avoid "fish-eyes" during hydration