HARDENING BITUMEN COMPOSITION (VARIANTS) Russian patent published in 1998 - IPC

FIELD: production of bitumen compositions which may be used as sealing material. SUBSTANCE: hardening composition comprises, mas.%: powder bitumen component, 35-55; petroleum products being used for swelling of mentioned above bitumen component, the balance. Said powder bitumen component has softening point of 125-165 C, quantity of particles sized not more than 1 mm being 90-100. Mixture of distillate and residual oil fractions or mixture of distillate and oxidized oil fractions (content of distillate oil fractions in it being 40-70 mass %) is used as mentioned above petroleum products. Viscosity of said mixture at 20 C is 5-10 s, boiling away temperature of oil fractions is 200 - 500 C and higher. According to the second variant proposed bitumen composition comprises organosilicon liquid, its quantity being not more than 0.01 mass % of total mass of composition. EFFECT: decreased shrinkage of composition, decreased duration of its transformation in non-flow condition. 3 cl, 2 tbl