34 SILICONES
Figure 5: BRB Clear Hand Sanitization Gels containing 2% of: (E”) PEG-12 Dimethicone; (G’) Blank; (H’) PEG-10 Dimethicone; (I’) PEG/PPG-18/18 Dimethicone; (O’) PG/Glycerin.
sanitiser work. This is omitted for the same reason of more practical content. pH dependency of gelling behaviour is
not explored as well. As carbomers are neutralised it is always an equilibrium distribution of unnaturalised acid and fully neutralised salt form in which pH definitely moves system behaviour. Several hand sanitisers with and without
silicone copolyols on fragrance load are being checked. It is found that at least at 1% net fragrance load, all clear gels remain clear without any cloudiness or precipitation.
Further screenings and formulations Detailed work from the above two silicone copolyols sets concrete foundations for screening all silicones that have been selected. In the first run, more copolyols have
Blank PEG-12
been included: Cetyl PEG/PPG-10/1 Dimethicone and PEG-10 dimethicone. The silicones concentration is being locked at 2% and the ethanol level at 70% for the ease of single variable comparisons. The formulation compositions are summarised in Table 2 and the selected gels are shown in Figure 5. From experience, it is known that with
Trimethylsiloxysilicate (TMS), BRB 1860 (proprietary D5-free gum blend), BRB DM 55 (proprietary D5 replacement), BRB DM 66 (proprietary D5/D6 blend replacement) it is impossible to form completely clear gels but it is checked whether they have other merits such as sensory benefits. Gels made from BRB 1860, BRB DM 55
and BRB DM 66 are translucent. This therefore offered some blending opportunity to be sought in the following section. A blank and a glycerin/PG formulation are
Table 2: Composition summary of the screening formulations for BRB silicones. Formulation Code
PEG-10 Water
Carbomer 940 TIPA
Ethanol
29.40 0.34 0.26
70.00
PEG-12 Dimethicone 0.00 PEG-10 Dimethicone 0.00
PEG/PPG-18/18 Dimethicone
Oatyl PEG/PPG-10/1 Dimethicone
BRB TMS BRB 1860 DM55 DM66
PG/Glycerin 0.00
0.00 0.00
0.00 0.00 0.00 0.00
PERSONAL CARE EUROPE
Dimethicone Dimethicone 27.40
0.34 0.26
70.00 2.00 0.00
0.00
0.00 0.00
0.00 0.00 0.00 0.00
27.40 0.34 0.26
70.00 0.00 2.00
0.00
0.00 0.00
0.00 0.00 0.00 0.00
PEG/PPG- 18/18
Dimethicone 27.40 0.34 0.26
70.00 0.00 0.00
2.00
0.00 0.00
0.00 0.00 0.00 0.00
Cetyl PEG/PPG- 10/18
Dimethicone 27.40 0.34 0.26
70.00 0.00 0.00
0.00
2.00 0.00
0.00 0.00 0.00 0.00
being inserted as sensory controls in the following section. Today’s customers have multiple needs.
While a clean gel may communicate cleanliness to consumers, solving unmet needs of current poor hand after-feel is even more important. To prepare for the next section of sensory work following compositions are being prepared. 5% L’ and 95% E” as “BRB 2020A” which
targets clarity, super moisturisation, and good hand after-feel. 50% L’ and 50% E” as “BRB 2020B” which
targets super hand after-feel with moisturisation, softness, silky and natural hand after-feel. 50% L’ and 50% I’ as “BRB 2020C” which
offers super hand after-feel while additional capacity to incorporate additional ingredient to form emulsion.
TMS
27.40 0.34 0.26
70.00 0.00 0.00
0.00
2.00 2.00
0.00 0.00 0.00 0.00
BRB1860 DM55 DM66
27.40 0.34 0.26
70.00 0.00 0.00
0.00
0.00 0.00
2.00 0.00 0.00 0.00
27.40 27.40 0.34 0.34 0.26 0.26 70.00 70.00 0.00 0.00 0.00 0.00
0.00 0.00
0.00 0.00 0.00 0.00
0.00 0.00 2.00 0.00 0.00 2.00 0.00 0.00
Glycerin/
Propylene Glycol 27.40
0.34 0.26
70.00
0.000.00 0.00
0.00
0.00 0.00
0.00 0.00 0.00 2.00
November 2020
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