| 摘要 |
<p>A composite material which is suitable as a wall covering comprises a substrate layer that is permeable to water vapour, such as a nonwoven web material made from woodpulp and polyesters fibres, and that is coated, preferably extrusion coated, with a layer comprising an olefin polymer, olefin copolymer or blend of olefin (co)polymer and a particulate filler, e.g. calcium carbonate or a mixture thereof with titanium dioxide. The coating layer is also permeable to water vapour. A preferred olefin copolymer is an ethylene n-butyl acrylate copolymer.</p> |
