コールタールピッチ

化学的特性The term “coal tar products,” as used by NIOSH, includes coal tar and two of the fractionation products of coal tar, creosote and coal tar pitch, derived from the carbonization of bituminous coal. Coal tar, coal tar pitch, and creosote (coal tar creosote 8001-58-9) derived from bituminous coal often contain identifiable components which by themselves are carcinogenic, such as benzo(a) pyrene, benzanthracene, chrysene, and phenanthrene. Other chemicals from coal tar products, such as anthracene, carbazole, fluoranthene, and pyrene may also cause cancer,but these causal relationships have not been adequately documented. Also, the research chemical methylcholanthrene (CAS: 56-49-5), a powerful carcinogen, fits this category. Coal tar pitch is a black viscous liquid. Aromatic solvent odor. Boiling point =>260°C; specific gravity (H2O:1) = 1.07-108; freezing/melting point = 250-°180C;flash point = 207°C (coal tar pitch); 74C (creosote oil);autoignition temperature =>510°C. Insoluble in water.Coal tar creosote (8001-58-9, crosote) is an black oily,tar-like substance. Pungent odor

解説単にタールともいう．石炭熱分解(乾留)で生成する茶褐色あるいは黒色の粘りのある液状物質．多種類の芳香族化合物からなる．一般には，コークスの製造過程で副生するコールタールをさし，タール化学工業の原料として重要である．蒸留により数種類の油分とピッチ(コールタールピッチ)に分別され，油分は医薬品，農薬，香料，染料，各種機能性化学品などの原料になり，ピッチは電極用バインダーやさまざまな炭素材料に利用される．森北出版「化学辞典（第2版）

用途塗料、防水剤

用途電極?炭素製品成形用原料、絶縁充てん物、煉炭用粘結剤 (化学工業日報社)

使用Coal tar pitch is used as a base for paints and coatings, as a binder for carbon electrodes, for impregnating fiber pipe, in briquetting coal, in foundry core compounds, as a plasticizer for elastomers and polymers, as extenders, saturants, impregnants, and sealants, and in paving and roofing. Occupations with potential exposures to coal tar, coal tar pitch.

定義coal tar: A tar obtained from the destructivedistillation of coal. Formerly,coal tar was obtained as a byproductin manufacturing coal gas.Now it is produced in making cokefor steel making. The crude tar containsa large number of organiccompounds, such as benzene, naphthalene,methylbenzene, phenols,etc., which can be obtained by distillation.The residue is pitch. At onetime coal tar was the major source oforganic chemicals, most of which arenow derived from petroleum andnatural gas.