Film-forming cosmetic composition comprising polyurethane and cross-linked starch
A technology of cosmetic composition and cross-linked starch, which is applied in the direction of cosmetics, cosmetic preparations, medical preparations containing active ingredients, etc., and can solve the problems of not disclosing or providing solutions to prevent or reduce particle deposition
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Embodiment 1
[0127] Embodiment 1: test different amounts of polyurethane (PU)
[0128] Formulations 1 to 4 in Table 2 were prepared by mixing the relevant amounts of PU-35 (Baycusan C 1004 from Covestro) with 6% by weight of hydroxypropyl starch phosphate (Structure XL) in water.
[0129] Each formulation was evenly applied to an area approximately 2 cm in diameter on the back of the hand. After drying for 1 to 2 minutes, spray pure water on the applied area, and the polyurethane film gradually turns white. The resulting film was evaluated for pick-up in its entirety and the continuity of the peeled film was observed.
[0130] The results are shown in Table 2 below:
[0131] The diagram of the table is as follows:
[0132] √: Can pick up the film (peeling) / the whole film (continuity of the film)
[0133] X: Film cannot be picked up (peeling) / crack (continuity of film).
[0134] Table 2
[0135]
[0136] Thus, compositions comprising at least 6.97% by weight of PU-35 are capabl...
Embodiment 2
[0137] Embodiment 2: Test different amounts of hydroxypropyl starch phosphate
[0138] Formulations 5 to 8 in Table 3 were prepared by mixing 20.5% by weight of active material PU-35 (Baycusan C 1004 from Covestro) with the relevant amounts of hydroxypropyl starch phosphate (Structure XL) in water.
[0139] The water resistance and spreading properties of the obtained films were evaluated.
[0140] To do this, apply each preparation evenly on the back of the hand. The feeling of spreading was assessed during application. After drying for 1 to 2 minutes, spray plain water over the applied area. The color of the film with residual water was observed to assess water resistance.
[0141] The results are shown in Table 3 below:
[0142] The diagram of the table is as follows:
[0143] Spreadability: +++ very slippery, +++ slippery, + not too slippery, - not slippery at all
[0144] Water Resistance: ++ Transparent Film & Residual Water Drops (Membrane Repels Water), + Trans...
Embodiment 3
[0148] Example 3: Comparative study of films comprising PU and cross-linked starch and films comprising PU and polyacrylate derivatives
[0149] Formulations 1 to 12 in Table 4 were prepared as indicated.
[0150] The resulting films were evaluated as follows:
[0151] Benefit 1: Each formulation was coated on a plastic plate by an elcometer to form a film with a thickness of 50 μm. The membrane was placed in a fume hood to dry for 24 hours.
[0152] The contact angle of MilliQ water on the film was then measured with a contact angle meter. For each formulation, 15 μL of water was dropped onto the membrane, and the contact angle of the water drop on the membrane was recorded immediately after contact, which was denoted as CA0. After 5 minutes, the contact angle was recorded and denoted as CA5min.
[0153] ΔCA=CA0-CA5min.
[0154] CA0, CA5min and ΔCA are listed in Table 4 as benefit 1.
[0155] Benefit 2: Observe the color of the film immediately after wetting. T = clea...
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