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It has also found use as a plasticizer. Bisphenol A is difunctional and used to produce epoxy resin and polycarbonate. 4-tert-Butylphenol is monofunctional and so in polymer science terms, bisphenol A is a polymer chain extender but 4-tert-butylphenol is a chain stopper or sometimes called endcapper. It is thus use to control molecular weight ...
Skin care is a routine daily procedure in many settings, such as skin that is either too dry or too moist, and prevention of dermatitis and prevention of skin injuries. [ 3 ] Skin care is a part of the treatment of wound healing , radiation therapy and some medications.
It is also used as low-ionic strength solutions as a preservative in some foods and drugs. [5] In most cosmetics paraben is used at low levels, ranging from 0.01 to 0.3%. [ 9 ] Butylparaben is used in low concentrations in liquid and solid medication suspensions, such as Tylenol ( acetaminophen ) and ibuprofen .
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[5] [7] The solvent that is used as a dispersion medium can be aqueous, organic, inorganic, or a system of different solvents. [5] Topical gels are used as a contact or transport medium for active drugs to act on [4] or through the skin. [9] The active drug molecules are entwined into the 3D mesh of the gel and delivered to the site of action.
The skin on the face is most commonly treated, but peels can also be performed on the body. Chemical peels are intended to remove the outermost layers of the skin. To accomplish this task, the chosen peel solution induces a controlled injury to the skin, which causes the skin to peel.
The personal skin care market based on natural products has shown strong growth. [7] Clinical and laboratory studies have identified activities in many natural ingredients that have potential beneficial activities for personal skin care, [2] [3] but there is a shortage of convincing evidence for natural product efficacy in medical problems. [8]
The chemical synthesis of BHT in industry has involved the reaction of p-cresol (4-methylphenol) with isobutylene (2-methylpropene), catalyzed by sulfuric acid: [11] CH 3 (C 6 H 4)OH + 2 CH 2 =C(CH 3) 2 → ((CH 3) 3 C) 2 CH 3 C 6 H 2 OH. Alternatively, BHT has been prepared from 2,6-di-tert-butylphenol by hydroxymethylation or aminomethylation ...
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