|
|Section2= |Section3= |Section4= }} Musk xylene is a synthetic musk fragrance which mimics natural musk. It has been used as a perfume fixative in a wide variety of consumer products, and is still used in some cosmetics and fragrances. Musk xylene was once the most widely used of the "nitro-musks", but its use has declined sharply since the mid-1980s due to safety and environmental concerns. Its explosive and carcinogenic hazards are recognized to be borderline, and musk xylene is a useful example of the lowest level of such risks which need to be taken into account. However, it is a very persistent and very bioaccumulative polluant in the aquatic environment (vPvB substance), and is the first substance to be proposed as a "substance of very high concern" (SVHC) for these reasons alone under the European Union REACH Regulation. Since no company has applied for authorisation, therefore it is banned in the EU.〔http://echa.europa.eu/chemicals-in-our-life/are-there-safer-alternatives〕 ==Production and use== Musk xylene is produced from ''meta''-xylene (1,3-dimethylbenzene), by a Friedel–Crafts alkylation with ''tert''-butyl chloride and aluminium chloride followed by nitration with fuming nitric acid or with a 70:30 mixture of nitric acid and sulfuric acid. The crude product is recrystallized from 95% ethanol.〔Bedoukian (1986).〕 518px Musk xylene has been used in a wide variety of consumer products since the early 1900s, usually in very small quantities. World production of nitro musks in 1987 was about 2500 tonnes, but had fallen to about 1000 tonnes by the early 1990s: musk xylene made up roughly two-thirds of the production of nitro musks during this period. Production was concentrated in Western Europe, with the United Kingdom alone accounting for 28% of world production of nitro musks.〔International Agency for Research on Cancer (1996).〕〔Ippen (1994).〕 Use of musk xylene continued to decline through the 1990s, as fragrance manufacturers voluntarily switched to alternative fragrance compounds.〔OSPAR Commission (2004).〕 For example, musk xylene has not been used in Japanese products (on a voluntary basis) since 1982,〔 and the Association of the German Toiletries and Detergents Industry (IKW) recommended the replacement of musk xylene by another compound in 1993.〔Section 2, ''European Union Risk Assessment Report'' (2005), pp. 9–10.〕 Production of musk xylene in the European Union came to a halt and, by 2000 (the last year for which full data are available), imports to Europe were only 67 tonnes, with China as the most important source.〔 The estimated 2008 usage of musk xylene in the European Union was 25 tonnes.〔RIVM–DHI–RPA (2008).〕 Musk xylene is still permitted for use in cosmetics products (except oral care products) in the European Union under the Cosmetics Directive. The permitted quantities are: up to 1% in fine fragrances; up to 0.4% in eau de toilette; up to 0.03% in other products.〔ATP (2004) to the Cosmetics Directive.〕 European Union suppliers must inform their customers on request if a product contains more than 0.1% by weight of musk xylene.〔Article 31.3, REACH Regulation, at p. 108.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Musk xylene」の詳細全文を読む スポンサード リンク
|
