Carbomer is a crosslinked polyacrylic acid polymer widely used as a formulation ingredient in controlled industrial systems. Identified by CAS 9007‑20‑9, this polymer exhibits high molecular weight and efficient rheology modification behavior when properly neutralized. In industrial practice, carbomer is commonly applied in cosmetic formulations to adjust viscosity, stabilize dispersion systems, and support uniform texture development. This material is supplied for industrial and formulation use only and is provided with complete MSDS, TDS, COA documentation for qualified customers and bulk supply requirements.
Carbomer CAS 9007‑20‑9
- CAS: 9007-20-9
- Synonyms: Carbomer, Crosslinked Polyacrylic Acid, Acrylic Polymer Thickener, Carbopol-type Polymer
- Molecular Formula: C3H4O2
- Grade: Industrial grade 99%
- Package: 200kg iron drum or 50kg plastic drum packaging
Product Description
Carbomer
alias: polyacrylic; Carboxylethylene copolymer
CAS Number: 9007-20-9
molecular formula：C3H4O2
molecular weight：72.06270
Exact mass: 72.02110
LogP：0.25700
density：1.063g/cm3
melting point：12.5ºC
boiling point：141ºC
flash point：61.6ºC
refractive index：n20/D 1.442
CARBOMER is an acrylic polymer containing polyene-based polyether cross-linking. It is a white loose powder with strong hygroscopicity. Because its molecular structure contains carboxyl groups, it has a certain acidity and can be neutralized by alkaline substances to form a transparent gel. After the carboxyl group is ionized by neutralization, the molecular chain spreads and stretches due to the mutual repulsion of negative charges, and is extremely expanded and viscous. Cabo resin can produce a thickening effect at a very low dose. Carbo resin can make liquid systems have special yield values and rheology, and some insoluble additives (granules, oil droplets, etc.) can be suspended at a very low concentration. Due to its suspension ability, carbo resin is widely used to stabilize traditional oil/water emulsions and creams, oil droplet particles in suspension solutions, and water-insoluble substances. The viscosity of carbomer gel is positively correlated with concentration, and the higher the concentration, the higher the viscosity of the gel. Carbomer gel is sensitive to electrolyte ions, and the presence of electrolyte makes the viscosity of carbomer gel drop sharply, and the influence of divalent ions is greater than that of monovalent ions. The ion causes a decrease in the viscosity of the carbomer gel, mainly because it reduces the mutual repulsion of the same charge on the polymer backbone, resulting in a decrease in the actual effective concentration of carbomer in the system.
FAQ - Technical & Supply Chain
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Q:
Is CAS 9007-20-9 representative of the cross-linked rheology modifiers used in high-clarity gel systems?
A: Yes. CAS 9007-20-9 identifies Carbomer, a group of high molecular weight polymers of acrylic acid cross-linked with polyalkenyl polyethers. It is technically distinct from linear polyacrylates due to its ability to form stable, high-viscosity micro-network structures rather than simple thickened solutions, which is essential for maintaining permanent suspensions in industrial and cosmetic formulations. -
Q:
How does the electrolyte sensitivity of CAS 9007-20-9 affect its selection for formulations with high salt content?
A: Carbomer polymers are typically ion-sensitive. In the presence of significant concentrations of electrolytes or salts, the electrostatic repulsion between the polymer chains is shielded, which can lead to a collapse of the gel network and a sharp decrease in viscosity. For industrial applications requiring rheological stability in saline environments, the compatibility of CAS 9007-20-9 must be evaluated against the specific ionic strength of the system. -
Q:
What are the technical considerations for neutralizing CAS 9007-20-9 to achieve its intended thickening function?
A: In its supplied acidic state, the polymer molecules are tightly coiled and provide minimal viscosity. Thickening is typically triggered by neutralization with an inorganic or organic base (such as sodium hydroxide or certain amines) to a pH range of 6.0–10.0. This process ionizes the carboxyl groups along the polymer backbone, causing the chains to expand through electrostatic repulsion and create the desired rheological profile.
Documents
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