| 摘要 |
<p>A waterproofing agent which can be used at low temperatures comprises a support film and a bituminous layer in which the bituminous component comprises 26 to 62 weight percent oxidised bitumen, 21 to 65 weight percent process oil and 9 to 25 weight percent of a random copolymer of stryrene and butadiene monomers.</p> |
