| abstract |
The present invention relates to a vacuum insulation board ( 1 ) comprising:n a hermetically closed covering ( 3 ) in which the pressure is lower than atmospheric pressure, a core material ( 5 ) made of organic aerogel placed inside said covering ( 3 ),n nsaid organic aerogel being based on a resin resulting at least in part from polyhydroxybenzene(s) R and formaldehyde(s) F,n nsaid organic aerogel being a polymeric monolithic organic gel comprising at least one water-soluble cationic polyelectrolyte,n nor said organic aerogel being a pyrolysate of said gel in the form of a porous carbon monolith comprising the product of the pyrolysis of said at least one water-soluble cationic polyelectrolyte P,n nsaid organic aerogel exhibiting a specific thermal conductivity of between 10 and 40 mW·m −1 ·K −1 at atmospheric pressure. |