Parsol 1789 - GreenCupboards

Description
PARSOL ® 1789 is an oil-soluble UV-A filter.
Chemical structure
Comparative UV absorption spectra of
PARSOL ® 1789 vs. Benzophenone-3
(1 0 mg/ L in absolute ethanol)
Absorbance
1.5 Benzophenone-3
PARSOL ® 1789
1
0.5
C 20
H 22
O 3
M r
310.4
CAS No.: 70356-09-1
EINECS No.: 274-581-6
INCI name: butyl methoxydibenzolymethane
Chemical name: 1-(4-tert-butylphenyl)-3- (4-
methoxyphenyl)-propane-1, 3-dione
USAN nomenclature: avobenzone
Physical and chemical properties
Appearance:
Odour:
Melting point: 81.0–86.0 °C
Assay (HPLC): min. 95.0%
UV specific extinction
(E 1%, 1 cm at 357 ±2 nm
white to pale yellow powder
slightly aromatic
in absolute ethanol): 1100–1180
Flash point (liquid): > 100 °C (212 °F)
UV absorption spectra
PARSOL ® 1789
Absorbance Absorbtion (%)
2.5
2
1.5
1
0.5
5 mg/ L
10 mg/L
20 mg/ L
0
250 300 350 400
Wavelength (nm)
Blend of PARSOL ® 1789 and PARSOL ® MCX
50/5 0 w/ w
99.7
99.0
96.8
90.0
68.4
Absorbance Absorbtion (%)
2.5
2
10 mg/L
20 mg/ L
40 mg/L
0
99.7
99.0
Stability and storage
PARSOL ® 1789 is incompatible with formaldehyde,
formaldehyde donor preservatives and heavy
metals (pink-orange colour with iron). A sequestering
agent is recommended. Formulations with
PABA and its esters develop a yellow colour.
Can form complexes with aluminium above pH 7,
with free aluminium resulting from the coating of
some grades of microfine pigments.
The product may be stored for 24 months from the
date of manufacture in the unopened original
container and at a temperature below 25 °C. The
‘best used before’ date is printed on the label.
Store in tight containers protected from light.
Suitable materials for containers are stainless
steel, dark glass, polyethylene and enamel.
Uses
0
250 300 350 400
Wavelength (nm)
Instrument: Uvikon 941
Cell thickness: 1 cm
Solvent: absolute ethanol
PARSOL ® 1789, combined with recognized safe
and effective UV-B filters, provides broad-spectrum
protection in skin and sun-care preparations.
PARSOL ® 1789 can be used for the formulation of
protective hair-care, medicated skin-care and
protective skin-tone preparations.
It can be used to quench phototoxic skin reactions
initiated by weak phototoxic materials.
1.5
1
0.5
0
250 300 350 400
Wavelength (nm)
96.8
90.0
68.4
0