Why is Carbomer called "a good friend of formulators"?

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Briefly describe the characteristics of carbomer

Carbomer is usually provided in the form of a fluffy, white, hygroscopic powder, which may have a slight acetic acid odor. There are many kinds of carbomers on the market. The main difference lies in the type of process solvent used (ie, benzene and non-benzene), the type and level of crosslinking agent used, and optional additives added to improve wetting and dispersibility. Carbomer can also be provided in a pre-neutralized form, such as the sodium salt (INCI: Sodium Carbomer). Carbomer used in the concentrations used in cosmetics and personal care products is considered non-toxic and has little irritation to the skin and eyes. Impurities in these polymers may include residual polymerization solvents, unreacted monomers (such as acrylic acid), acetic acid, propionic acid, polymerization initiator by-products, and trace amounts of heavy metals.

Carbomer can impart high yield value to formula

Carbomer can effectively build viscosity in aqueous systems at relatively low dosages. For example, most carbomers can establish a viscosity of 10,000–60,000 CP when using only 0.5% w/w. Therefore, carbomer is commonly used as an aqueous thickener in various products. However, the true utility of carbomers stems from their ability to impart high yield values ​​to formulations.

The yield value is the resistance of the fluid to the initial flow when stress is applied. In a static state, the tightly packed carbomer microgel network behaves as an elastic solid, which can resist deformation. The network does not start to flow until a critical level of shear stress, or yield stress, is applied. At this time, the microgels can slide on each other, causing fluid flow. When heterogeneous phases (for example, emulsion droplets, pigments, pearlescent agents, sunscreens, bubbles, silica abrasives, etc.) are dispersed in the carbomer thickening formula, the microgel network will trap and stabilize them, preventing them from being The fluid is at rest, that is, below the yield stress. However, when a stress exceeding the yield stress is applied, the fluid will flow smoothly to achieve product distribution and application. For this reason, carbomer is used to formulate countless products.

Carbomer is known as a good friend of the formulator

For more than 50 years, formulators in multiple industries have relied on various carbomers to increase viscosity, form gels, stabilize emulsions and suspended particles. When used properly, carbomer helps to incorporate consumer beauty into products while achieving long-term shelf stability. Because of its practicality, reliability, and occasional ability to save doomed products by stabilizing poorly conceived formulas to prevent separation, experienced product developers describe Carbomer as "a good friend of formulators ".