HAIR STRENGTHENING FOR
DAMAGED HAIR
Yin Hessefort, Luciene Bastos, Claudio Ribeiro, Robert Williams, Eric Anderson, Malte
Ruffing, Narjis Askar, Ann Giovannitti-Jensen, Cheryl Slabozeski, Murat Kadir
INTRODUCTION
TENSILE STRENGTH ASSESSMENT
Hair surface and internal damages are studied. FT-IR analysis
illustrates that surface damage intensifies when chemical
treatment is repeated. Tensile strength indicates that relaxer
treatment causes the most internal damages among all the
other chemical treatments. Our research demonstrates that
the relaxer treatment containing acrylic acid and acrylamidomethyl propane sulfonic acid copolymer (CG 4500 polymer)
significantly improves by about 20% tensile strength, in Brazilian hair relaxed with guanidine, compared to the system
containing no polymer. In Kinky hair relaxed with lye relaxer,
the improvement is about 55%. The metals removal is also
demonstrated here.
COOH
*
The addition of CG4500 Polymer in
both lye and no lye relaxers improves
tensile strength statistically better than
control.
*
m
n
O
HN
SO3H
Figure 5: tensile Strength for Natural African-American hair treated with lye relaxer.ferent than control.
Figure 1: acrylic acid and acrylamidomethyl propane sulfonic acid copolymer structure
MATERIALS AND METHODS
• Hair tresses, 6 inches long were obtained from International Hair Importer, Inc;
• Caucasian hair was bleached using a commercial product and analyzed via Attenuated Total
Reflectance (ATR);
• Caucasian and Brazilian hair were relaxed with Lubrizol no lye relaxer formulation. Kinky and
Brazilian hair were relaxed with lye formulation;
• All types of hair were tested via Single Hair Fiber Tensile Strength Analysis.The hair samples
were placed in a Dia-Stron Miniature Tensile Tester (Model 170/670) for the determination of
tensile strength in a wet condition.
• Calcium deposition and removal were analyzed via image analysis in Keyence Digital
Microscope at 2000 Magnification.
• Hair color improvement was analysed at HunterLab, in tresses washed with shampoo
containing CG4500 polymer or not.
Figure 6: Brazilian hair treated with lye relaxer
Figure 7: Tensile Strength for Brazilian hair treated with lye relaxer
HAIR SHINE ASSESSMENT
1200 ppm Ca2+
00 ppm Ca2+
RESULTS
HAIR SURFACE DAMAGE ASSESSMENT
FT-IR Analysis
Figure 8:Hair shine improvement due Ca2+ removal
HAIR DYE DEPOSITION
R-S-S-R
R-SO-S-R
R-SO2-S-R[R-SO2-SO-R]
R-SO2-SO2-R
2R-SO3H
Control
N-H and C-H
stretching bands
S-O/SO2
Figure 2: Hair surface damage assessment
CG4500
Figure 3: Hair surface damage assessment
HAIR INTERNAL DAMAGE ASSESSMENT
Hair was damaged using different treatments. Tensile strength was measured.
Figure 9: Hair dye deposition
Figure 10: Hair dye deposition
CONCLUSIONS: CG 4500 AS SOLUTION FOR DAMAGE CONTROL
AND HAIR DYE
Tensile strength evaluation of
different treatments indicates lye
relaxer damages the hair most
ACRYLIC ACID/ACRYLAMIDOMETHYL PROPANE SULFONIC ACID COPOLYMER
• CG4500 polymer was found having chelating capability
• Quantified metal ions removal
• Quantified color deposition enhancement
• Improved tensile strength of damaged hair
Figure 4: Hair internal damage assessment
formulate with confidence™
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