Solid Polyethylene Microspheres for Effects in Color Cosmetics

Apr 1, 2010 | Contact Author | By: Yelena Lipovetskaya, Cospheric LLC
Your message has been sent.
(click to close)
Contact the Author
Save
This item has been saved to your library.
View My Library
(click to close)
Save to My Library
Title: Solid Polyethylene Microspheres for Effects in Color Cosmetics
microspheresx color-matchingx soft focusx safetyx specific gravityx
  • Article
  • Media
  • Keywords/Abstract

Keywords: microspheres | color-matching | soft focus | safety | specific gravity

Abstract: Advances in manufacturing solid polyethylene microspheres have enabled their development in various colors as well as controlled traits such as opacity, specific gravity, particle size distribution and electrostatic charge. These traits can be leveraged by formulators to create new effects in color cosmetics, described here.

View citation for this article

Y Lipovetskaya, Solid polyethylene microspheres for effects in color cosmetics, Cosm & Toil 125(4) 46-51 (Apr 2010)

Excerpt Only This is a shortened version or summary of the article you requested. To view the complete article, please log in or create an account. Registration is Free!

Microsphere refers to a spherical microparticle between 1 and 1,000 microns (μm) in diameter. Also known as spheres, balls, beads or micro-balloons, microspheres are manufactured from a variety of raw materials. The most common types are solid and hollow glass or polymer microspheres, as well as ceramic. Each type is designed in different grades depending on the application and quality requirements. The quality of the microspheres ranges from monodispersed microspheres produced under tight specifications, to microsphere grades with variations in particle size and sphere uniformity.

Glass, polymer and ceramic microspheres are well-known in the cosmetics and personal care industry for advantages such as sensorial benefits and optical effects, among others. Their spherical shape and smooth surface create a low friction ball-bearing effect that gives formulations an elegant, silky feel. This ball-bearing effect promotes better blending on the skin and a more natural finish due to the enhanced slip, glide and omnidirectional spreadability, imparting a cream to powder texture. Outstanding roundness also provides lubrication during application, which enhances the tactile experience of a cosmetic product.

In addition to enhancing the feel and appearance of skin, the appropriate microspheres can minimize the appearance of fine lines and uneven skin tone. This is achieved due to microspheres’ ability to scatter light, an effect referred to as optical blurring or soft focus. Skin imperfections are visible due to high contrast. However, spherical particles have the capacity to optically reduce this contrast and hide imperfections on the skin surface by scattering or diffusing light. Since the microspheres optically blur lines and imperfections using light, the skin remains natural-looking.

Microspheres are also used as gentle exfoliators in facial scrubs. Round particles are known to be less irritating to the skin than irregularly shaped, abrasive exfoliants with sharp edges such as apricot kernels and walnut shells. The roundness and smoothness of microspheres therefore makes them gentle and effective exfoliating agents to remove dead cells without harming the skin. In addition, microspheres are commonly used as fillers/texture enhancers in pressed and loose powders, foundations, concealers, lipsticks, mascara, skin lotions and variety of other applications.

Colored Polyethylene Microspheres

A line of colored, solid polyethylene microspheres was recently developed via a proprietary process to produce polymer microspheres that are smooth, highly spherical, non-soluble in water and most solvents, and that withstand temperatures of up to 100°C. These spheres can be manufactured with specific gravities from 0.96 g/cc to 1.3 g/cc, which provides for optimal suspension in a solution. Solid polymer microspheres incorporate pigments and additives to achieve colorful fillers that serve multiple functions in a cosmetic formula by acting as colorant, opacifier and texture enhancer simultaneously.

Excerpt Only This is a shortened version or summary of the article you requested. To view the complete article, please log in or create an account. Registration is Free!

 

Close

Figure 1. Yellow polyethylene microspheres

Figure 1. Yellow polyethylene microspheres

Microsphere refers to a spherical microparticle between 1 and 1,000 microns (μm) in diameter; shown here are yellow polyethylene microspheres, 355 μm to 425 μm (magnification: 40x). *Image courtesy of Cospheric

Figure 2. Fluorescent polyethylene microspheres

Figure 2. Fluorescent polyethylene microspheres

Solid polyethylene microspheres can be manufactured in most colors, including flesh tone, clear, gray, fluorescent, glow-in-the-dark and multicolor, among others. Fluorescent polyethylene microspheres change color under UV light. *Image courtesy of Cospheric

 

Figure 3. Polyethylene microspheres color-matched to skin sample

Figure 3. Polyethylene microspheres color-matched to skin sample

Polyethylene microspheres provide several options for color effects as well as an array of color-matching possibilities; shown here are microspheres color-matched to a skin sample. *Image courtesy of Cospheric

 

Figure 4. White opaque polyethylene microspheres

Figure 4. White opaque polyethylene microspheres

Since opaque microspheres do not allow light to pass through, this means that just a 50 μm monolayer of opaque polyethylene spheres will not transmit light, thus resulting in good hiding power in one light layer of makeup. *Image courtesy of Cospheric

Figure 5. Red and white functionalized bichromal microspheres

Figure 5. Red and white functionalized bichromal microspheres

Dark-colored or black microspheres can be made magnetic or static-dissipative, and a black magnetic coating on a portion of the microsphere can be used to create functionalized hemispheres—i.e., magnetic half-shells that can be manipulated to rotate microspheres with an electromagnetic field.  *Image courtesy of Cospheric

Footnotes [Lipovetskaya 125(4)]

a Cospheric Microspheres (INCI: Polyethylene) are a product of Cospheric LLC, Santa Barbara, CA, USA.

Formula 1. Wrinkle and line minimizer

Cyclopentasiloxane (and) PEG/PPG-20/15 Dimethicone, 11.50% w/w
Polymethylmethacrylate Microspheres, 7.50
Cyclopentasiloxane, 8.50
Cyclopentasiloxane (and) Dimethicone, 7.50
Fragrance (parfum), 0.10
Quaternium-15, 0.10
Polysorbate 80, 0.20
Sodium Chloride, 1.00
Glycerin, 13.00
Deionized Water (aqua), 50.60

Next image >

 
 

Close

It's Free...

Register or Log in to get full access to this content

Registration includes:

  • Access to all premium content
  • One click ingredient sample requests
  • Save articles in the My Library tool

Create an Account or Log In