Long lasting cosmetic compositions
A composition and mixture technology, applied in the direction of cosmetics, cosmetic preparations, toiletry preparations, etc.
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Embodiment 1
[0221] Example 1 - Synthesis of WBPU-U based on polycarbonate polyols
[0222]Synthetic PU 126. The polycarbonate 1k polyol (PCP) was first dried at 110° C. under reduced pressure until it did not foam. A 500 mL three-necked glass reactor equipped with a condenser, magnetic stirrer, argon inlet, oil bath, and heating / stirring plate was purged with argon and charged with PCPlk (0.032 mol). The reactor was heated to 80°C for 0.5 hours. Isophorone diisocyanate (IPDI) (0.1 mol) was added dropwise to the reactor, and the mixture was stirred for 1 hour. The temperature was then lowered to 60°C, and a solution of zinc neodecanoate (0.1 g) in 5 mL of acetone was added dropwise to the reactor. Dimethylolbutyric acid (DMBA) (0.024 mol) was premixed with 25 mL of acetone and added to the reactor. The reaction was stirred at 60 °C under argon for 16 hours. The next day, the reaction temperature was lowered to 30 °C, and the neutralizing base Na 2 CO 3 (0.012mol) was added to the ...
Embodiment 2
[0233] Embodiment 2: mechanical properties
[0234] Young's modulus is a measure of the ability of a material to withstand a change in length under uniaxial tension or compression. A higher Young's modulus generally indicates a stiffer material. Elongation at break, also known as strain at break, is the ratio of the changed length of a specimen after fracture to its original length. A higher elongation at break indicates the ability of the material to resist fracture. In order for a composition applied to hair to be able to maintain the shape of the hair, the Young's modulus and elongation at break of the composition should be such that the composition provides stiffness to the hair, but is not brittle.
[0235] The Young's modulus and elongation at break of some of the polyurethaneureas disclosed herein were compared with various commercially available polyurethane products. Young's modulus and elongation at break can be determined by a protocol defined as a measurement ...
Embodiment 3
[0260] Example 3: Hydrophobicity / Moisture Absorption of Polyurethaneurea
[0261] The moisture absorption properties of WBPU or WBPU-U dry films in high humidity environments have been correlated with their long-lasting performance. Therefore, it is important to be able to reproducibly and accurately evaluate such moisture absorption properties to enable predictive in vitro evaluation of WBPU-U dry films. The following protocol can be used to determine the moisture absorption capacity of dry WBPU-U films in high humidity environments. It takes about 2-3 days for each sample group to complete the test.
[0262] Material
[0263] >15g WBPU-U solution
[0264] Per sample, 1 clean cell culture dish (60mm diameter x 15mm height) humidity chamber with flexibility to control temperature and relative humidity (RH)
[0265] test sample
[0266] 1. Prepare 15 g of a 10% by weight WBPU-U solution from its corresponding stock solution.
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