| INCI: Sodium
Carbomer
Pre-Neutralized Carbomer PNC-400
is a pre-neutralized synthetic polymer that can be used as a
thickener, suspending agent and stabilizer in most cosmetic
formulations. The use of Pre-Neutralized Carbomers provide several
advantages.
- superior handling (low dusting
powder)
- quick dispersion
- simplification of production process
(elimination of neutralizing phase)
- constant ph during all the
production process
- enables the viscosity modification
of finished products
- PNC dispersions are characterized by
high viscosity and clarity
Contrary to traditional carbomers,
PNC400 does not require any predispersion and thickens as soon as
sprinkled into water or water/alcohol blend (upto70:30)giving a
clear viscous gel.
Slow addition of the powder avoids the
formation of lumps and guarantees a quick thickening. During the
preparation of emulsions, PNC400 can be dispersed in the oil or in
the water phase before the emulsification step or sprinkled directly
into the emulsion, stirring until an homogeneous system is
obtained.
The pH achieved at 0.5% in water is
around 7. If a lower pH is required, little adjustments are possible
by addition of acids (e.g.HCI,H3P04,citricandlacticacid). High
amounts of acid should be avoided because of the formation of salt
that effects the viscosity widely. In normal conditions, gels
prepared with PNC400 neither prevent nor promote the growth of
micro- organisms; therefore the addition of a suitable preservative
system is advisable. UV rays can cause loss of viscosity in PNC400
gels. The addition of water-soluble UV-absorbers, such as UVASORBS5
(Benzophenone-4), can help for preventing polymer
degradation. |
