| 摘要 |
1512357 Bitumen-coated fabric SOPREMA ET USINES ALSACIENNES D'EMULSIONS REUNIES S AR'L 14 June 1976 [30 June 1975] 24505/76 Heading B2E A covering material is obtained by impregnating a web of bonded un-woven polyester fibres with bitumen by passing the web over coating rollers dipping into molten bitumen at between 160‹C and 180‹C, coating the whole of one surface or both surfaces of the impregnated web with a coating mixture at between 180‹C and 200‹C, the mixture being obtained by stirring bitumen in a mixer without causing the bitumen to include air bubbles and mixing into this bitumen a pulverulent polymer and a thermoplastic resin and covering the coated surface or surfaces with an anti-adhesion substance. The anti-adhesion substance may be sand or talc powder, flakes of slate, or coloured granules. The pulverulent polymer may be an elastomer of the copolymer block polystyrene-polybutadiene-polystyrene type and the thermoplastic resin may be of the polydiene hydrocarbon resin type or the polycyclic thermoplastic hydrocarbon resin type. |
