Procedure:
In final mixing kettle, with
adequate mixing add Phase A ingredients in order listed.
Begin heating after the
addition
of the Centrolex D. Continue heating, with combined
homogenizer and side-sweep mixing and add remainder of Phase A
ingredients. In a separate vessel combine Phase B ingredients and
begin heating to 80°C
with gentle mixing. When Phase A
reaches 78°C,
add Phase B (80°C)
into Phase A. Mix for 15 minutes and begin cooling down to 65°C
and add Phase C. After Phase C has been added resume cooling down to
60°C
then switch to only side-sweep mixing. At 30°C
add Phase D, then Phase E. Continue cooling down to room
temperature. Kettles must remain covered at all times.
Key Formulations Attributes:
Emulsifier-free
formulation/Neutral pH-6.70 (also stable at lower pH's)
Easy to manufacture-no pulverizing or colloid milling of pigments
required.
High molecular weight silicone (60,000cst dimethicone) for smooth skin
feel
SPF 15
4 weeks 50°C
stability
Transfer-Proof/Long-Wear Polymers
