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Polyurethanes for Cosmetics
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Bayqsan® for decorative cosmetics
Also, its creates a natural soft feel on skin. Overall, Bayqsan® displays a good balance of properties:
- Outstanding water resistance
- Excellent pigment spreadability
- Great aesthetics, even uniform color distribution
- Good non-transfer and long-lasting properties
Baycusan® in mascara formulations
The Bayqsan® C 1000 and Bayqsan® C 1004 dispersions are suitable for mascara formulations. To test and demonstrate how these film-forming raw materials affect the water resistance of mascara formulations, experts at Bayer MaterialScience have developed a method of their own. They first apply black mascara to a piece of cotton fabric and measure the color intensity and weight of the specimen. The fabric is then immersed in a bath of water for 30 minutes, after which the color and weight loss of the fabric is measured to establish how much mascara has been dissolved in the water. One of their findings was that specimens with an otherwise identical oil-in-water formulation but no polyurethane dispersion lost around 22 percent of their color intensity, while those containing Bayqsan® C 1004 lost only 8 percent. The specimens with Bayqsan® C 1000 lost only 5 percent. These results show that the raw materials from Bayer MaterialScience performed much better than conventional, frequently used film formers.
The polyurethane dispersions also give mascara and eyeliners good abrasive resistance, with Bayqsan® C 1004 achieving slightly better results in this case than Bayqsan® C 1000. Otherwise, the two dispersions differ primarily in the elasticity of the resulting films.
With mascara based on Bayqsan® C 1000, the eyelashes can be shaped into an attractive curved form that retain their shape and style over a long period. "Positive subjective assessments by users have been confirmed through a standard test that is frequently used for hairstyling products. This shows that the polyurethane has a particularly good ‘curl retention capacity'.
Polyurea powder in decorative cosmetics impart a particularly pleasant feel to the skin
Bayqsan® C 1005 polyurea powder can give decorative cosmetics and skin-care products a whole range of desired properties. Recent measurements show that it can absorb more oil than other frequently used powders such as acrylate cross-polymers, starch derivatives or conventional polyurethanes. It can therefore be used, for example, to formulate make-up products that effectively reduce the greasiness of the skin. Sensorial tests by the french Dermscan Group, carried out by a panel of trained consumers, also confirm that Bayqsan® C 1005 gives a pleasant, velvety-silky feel to the skin. Liquid make-up formulations containing Bayqsan® C 1005 are particularly easy to apply and are not tacky. Finally, the polyurea powder makes it easier to apply make-up containing pigments without leaving behind any color blotches.
Standardized comparisons between compressed powder eyeshadows revealed a further plus for Bayqsan® C 1005: it significantly increases the cohesion of the eyeshadow powder with the effect that, even after repeating the drop test ten times, no cracks were observed in the compressed powder.
Read the press release "Polyurethanes for a fantastic look" (4/09).
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