Study Set Content:
Ethanol
45.0
Ethylester of PVM/MA function
Film former
Dimethicone copolyol
Styling ease
Isopropyl alcohol
Solvent
Fragrance
Fragrance
Ethanol
Solvent
Also in this category, polymeric film formers are the backbone of the formulations, although both the intended use and the mode of action are somewhat different from those of styling aids.
HAIRSPRAYS
These products are applied to dry and already styled (set) hair in the form of fine mist or spray. The spray droplets collide with and become deposited on hair fibers
HAIRSPRAYS
As they spread on the hair surface, they tend to migrate and accumulate at the points where () fibers are very close or intersect with each other.
adjacent
This results in the formation of minute() distributed throughout the hair mass. As the solvent evaporates, these joints become ()bonds welding the fibers together and, thus, preventing the motion of individual hairs relative to each other.
joints, rigid
The strength of these hairspray bonds depends on several factors, of which the () is of paramount importance
nature of the polymeric resin
Most of the polymers used form adequately strong bonds at () relative humidity (RH).
low
As the RH increases beyond (), however, most resins begin to absorb moisture from the environment, softening the welds.
80%
At the same time, water () by hair causes rapid relaxation of the set configuration of the fibers and it is the tenacity of the hairspray welds alone that stabilizes the imparted style.
absorption
Clearly, the polymers that are() sensitive to the plastisizing effect of water are likely to be the better performers and are thus preferred for a hairspray product
least
Polymaleric anhydride ethyl ester weight %
5.0
Amino methyl propanol weight %
0.2
Dimethyl phtalate
0.4
Fragrance
0.2
Ethanol
70.0
