C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
403/54
C08J 9/14 (2006.01) C08G 8/10 (2006.01) C08K 5/42 (2006.01) C08L 61/06 (2006.01) C08L 61/10 (2006.01)
Patent
CA 1105649
ABSTRACT The present invention relates to a process for the preparation of phenol-formaldehyde foams by mixing a resol phase having a viscosity of between 8 and 60 poises and a novolac phase comprising a true novolac, a blowing agent, phenolsulphonic acid and, optionally, phenol, the relative amounts of resol phase and of novolac phase being such that the resol phase represents 45 to 75 % by weight of the mixture.
301744
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