| 摘要 |
PROBLEM TO BE SOLVED: To provide a cloth layer conveyor rubber belt furnished with cover rubber to restrain swelling against an aromatic resistance oily, especially coal tar and its fractionated substance. SOLUTION: Rubber ((weight after soaking)-(weight before soakin)/ (density of indan or 1,2,3,4-tetrahydronaphthalene)/(volume before soaking)) of which becomes less than 1 even when it is soaked in indan or 1,2,3,4- tetrahydronaphthalene for more than two hours is made cover rubber, or rubber or synthetic high polymer ((weight after soaking)/(weight before soaking)-1)/((density of indan or 1,2,3,4-tetrahydronaphthalene)/(volume before soaking) of which becomes less than 1 even when it is soaked in indan or 1,2,3,4- tetrahydronaphthalene for more than two houesis applied, impregnated or adhered by more than 0.1 mm.
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