| 摘要 |
<p>In a binder compsn. contg. acid-hardening phenoplasts and acid hardeners, in resin: hardener ratio 1:0.05 to 1:0.5, the resin consists of an aq. phenol-resol having molar ratio of charged phenol to aldehyde of 1:1.1 to 1:3. The hardener consists of Cu-, Al- or Fe(III)-salts of aromatic sulphonic acids and/or adducts of OH gp.-contg. water-miscible po-yols having OH-no. 50-500 at aromatic sulphonic acids.</p> |
