| 摘要 |
<p>The invention concerns a multilayer structure comprising a material coated with a block polyamide and block hydrophilic copolymer, said copolymer having a melting point less than 135 °C and preferably between 90 and 135 °C. Said structure is impermeable to liquid water and permeable to water vapour. The invention also concerns methods for preparing said block polyamide and block hydrophilic copolymers. It further concerns novel block polyamide and block polyether copolymers.</p> |
