| 摘要 |
<p>Sound absorbing foam system with at least 50% open cell, as cell framework from polyurea, comprises lignosulfonate in chemically bound- and/or mixed-form. An independent claim is included for a method for preparing the foam system comprising mixing lignosulfonate-containing aqueous component (a) with polyisocyanate-prepolymer containing component (b) and hardening the reaction mixture under foaming.</p> |
