C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
117/189, 117/43,
C03B 37/00 (2006.01) C03C 25/00 (2006.01) C08G 8/00 (2006.01)
Patent
CA 1049173
ABSTRACT A process is disclosed for forming bonded fibre and fibre products by utilisation of an improved process for neutralising the catalyst employed in forming the A stage phenol-aldehyde resin or condensate. This condensate is the actual bonding agent which, when incorporated in a diluted form in a binder composition and sprayed onto the fibres and subsequently heated in an oven, cures and ?onds the fibres to one another. The condensate is a phenol- aldehyde condensate which is the result of reacting a phenol and an aldehyde in the presence of an alkali metal or alkaline earth metal hydroxide as catalyst to form an A stage or resole resin. The catalyst, once the reaction has been completed, is then neutralised, either before or after dilution, with an acidic lignosulphonate, or a liquor containing such material. An organic or mimeral acid can be utilised in conjunction with the lignosulphonate, or lignosulphonate liquor, so as to avoid adding excessive amounts of 1 gnosulphonate. The invention is also directed to the novel processes for forming the resin and binder composition disclosed.
203785
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