| 摘要 |
1296684 Laminates E I DU PONT DE NEMOURS & CO 30 Oct 1969 [30 Oct 1968] 53298/69 Heading B5N [Also in Division E1] A multilayer structure includes between a base layer and an outer layer an unvulcanized, non-cross-linked elastomeric membrane at least 1À27 mm. in thickness resistant to oxygen degradation and having a brittle point below 0‹ C. and comprising a copolymer of either ethylene and propylene or of ethylene, propylene and at least one non-conjugated diene having only one polymerizable double bond. Examples of suitable dienes are an open-chain C 6 to C 22 diene CH 2 =CH-R 1 -C(R 2 )=C(R 3 )H, where R 1 is alkylene and R 2 and R 3 are H or alkyl, or cyclopentadiene, dicyclopentadiene, 1 : 5 - cyclooctadiene, 5 - methylene- or 5- ethylidene - 2 - norbornene, and 2 - ethyl - 2 : 5- norbornadiene. The elastomer may include a filler such as carbon black, whiting or baryta, a plasticizing oil, a stabilizer such as a metal oxide, and an extrusion aid such as stearic acid or a wax. A release layer of paper or a plastics film as of polyethylene terephthalate or polypropylene may be applied to the elastomeric membrane if this is of a tacky nature for storage and transport purposes. As described, a concrete bridge road deck or a levelled roadway base of concrete, asphalt, gravel, sand-filled broken stone, bitumen-bonded aggregate or an existing road is covered with the elastomeric copolymer membrane which is in turn covered with a traffic bearing layer of asphalt, bitumen-bonded aggregate or Portland cement concrete. A roof having a base layer of wood, plastic, paper, cloth, or metal plates may have a similar copolymer membrane beneath an outer layer of tile or pebbles, while a basement wall of cinder block concrete or brick may be protected by applying such a membrane and then an outer layer of wood, sheet metal, gravel or earth. Reference is made to use in racetracks, foot pavements and athletics fields. |
