long-lasting cosmetic composition
A technology of composition and polyurethane urea, applied in the direction of cosmetics, cosmetic preparations, dressing preparations, etc.
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Examples
Embodiment 1
[0221] Example 1 - Synthesis of polycarbonate polyol based WBPU-U
[0222]PU 126 is synthesized. The polycarbonate 1k polyol (PCP) was first dried at 110° C. under reduced pressure until it did not foam. A 500 mL three-neck glass reactor equipped with a condenser, magnetic stirrer, argon inlet, oil bath, and heating / stir plate was purged with argon and charged with PCP1k (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 dropped 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 was 2 CO 3 (0.012 mol) was added to the rea...
Embodiment 2
[0233] Example 2: Mechanical Properties
[0234] Young's modulus is a measure of a material's ability to withstand changes in length under uniaxial tension or compression. A higher Young's modulus generally indicates a harder material. Elongation at break, also known as strain at break, is the ratio between the length of the specimen that changes after it breaks and the original length. Higher elongation at break indicates the ability of the material to resist breaking. In order for the composition applied to the hair 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 to various commercially available polyurethane products. Young's modulus and elongation at break can be determined by a protocol defined as measuring mechanica...
Embodiment 3
[0260] Example 3: Hydrophobicity / Moisture Absorption of Polyurethane Ureas
[0261] The moisture absorption properties of WBPU or WBPU-U dry films in high humidity environments have been correlated with their long-lasting retention properties. 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 WBPU-U dry 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] Each 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 wt% WBPU-U solution from its corresponding stock solution.
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Abstract
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