Role of Silicone Blender in Silicone-Based Primer Stability

Asked by: cram-croo On: March 17, 2016 Product Type: Cosmetics

Question

Is it necessary to include Silicone Blender (Dimethicone/peg-10/15 crosspolymer) to help emulsify/stabilize a primer formulation that uses Silicone Gel (Vinyl Dimethicone Crosspolymer base) mixed with Dimethicone and other ingredients, especially since the original example formula didn't use Silicone Blender?

Answer

Suggested Primer Formulation

This formulation is inspired by the Benefit The Porefessional primer and designed to have a thick, paste-like consistency.

  • Dimethicone: 20%
  • Silicone Gel (Vinyl Dimethicone Crosspolymer base): 65.4%
  • ISONONYL ISONONANOATE: 5%
  • Silica: 2%
  • Isododecane: 2%
  • Phenoxyethanol: 1%
  • Polymethyl methacrylate: 1%
  • Titanium Dioxide: 1% (Adjust amount based on desired opacity/whiteness)
  • Tocopheryl Acetate: 0.1%
  • Silicone Blender: 2% (Helps stabilize the silicone mixture)
  • Fragrance, Mica, Iron Oxides (CI 77492, CI 77491, CI 77499), Limonene: Trace amounts (Add as needed for desired color and scent)

Notes on Formulation:

  • The high percentage of Silicone Gel and Dimethicone are key to achieving the thick, paste-like texture you desire for tube packaging.
  • Silicone Blender is included as recommended to improve the stability of the silicone blend and prevent separation over time.
  • Silica and Polymethyl methacrylate contribute to the smooth feel and blurring effect, helping to minimize the appearance of pores.
  • ISONONYL ISONONANOATE and Isododecane are emollients and solvents that help with the spreadability and feel of the primer.
  • Titanium Dioxide provides some opacity and can help with brightening, adjust the percentage if you find it too whitening.
  • Phenoxyethanol is a preservative.
  • Tocopheryl Acetate is Vitamin E, an antioxidant.
  • Fragrance, Mica, Iron Oxides, and Limonene are for aesthetic purposes (scent and color) and are used in small amounts.

Combine all ingredients and mix thoroughly until a homogeneous, thick paste is formed.