| 摘要 |
A coal-tar-pitch-based roofing composition containing coal tar pitch, a rubbery block polymer, an extender oil, and an antioxidant to retard degradation of the coal tar pitch during blending of the composition, the composition being formed by heating the coal tar pitch, adding the naphthenic extender oil and the rubbery polymer and agitating the components at an elevated temperature for a period of time until phase inversion between the coal tar pitch and the rubbery polymer occurs.
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