10.carbomer/carbopol 941,934,934p,974p 940,980,1342,1382
Carbomer: carbopsol 940

Molecula structure:  -[CH2-CH-]-n cooh

CAS No.: 9003-01-4
Carbomer specifications:
Appearance:   white flowing powder
Viscosity :  15-30  Pa.s
Ph value:  2.5-3.5
Loss on drying: 2.0%  max.
Ash content:  0.01% max. (real tested results 0.00%)
Heavy metal: 20ppm max.
Carboxylic acid: 56-68% 
Appication:
     for a family of polymers that are used as thickeners, suspending agents and stabilizers. They are utilized in a wide variety of personal care products, pharmaceuticals and household cleaners. Most Carbopol polymers are high molecular weight acrylic acid chains, usually crosslinked, and are available as powders or liquids.
     Carbopol is used as a thickener in lotions, creams and gels. It is also used to stabilize, suspend, and control the release of pharmaceutical products. At low concentrations, solutions flow easily with a slippery feel. At higher concentrations, high viscosity varieties form gels that are pseudoplastic. At rest, the batch has a very high viscosity and resistance to flow. When shear force is applied by a mixer or pump, the apparent viscosity is reduced, and the liquid can be pumped.
      The typical powder is very light and fluffy, forming clouds of airborne dust if not handled carefully. It tends to float on water, requiring a good vortex to wet out. Once wet, it swells quickly with increasing viscosity. Different varieties produce varying viscosities, but most are used below 1% concentration. The crosslinked polymers are not actually water soluble, but swell into hydrated spheres that give the product its rheological properties.