Low-contaminant resols for cements

Details Low-contaminant resols for cements Low-contaminant resols for cements

C - Chemistry, Metallurgy

08

G

C08G 8/24 (2006.01) C08G 8/08 (2006.01) C08G 14/08 (2006.01) C09K 3/10 (2006.01)

Patent

CA 2135356

Abstract of the disclosure Low-contaminant resols for cements Resols which are suitable for use as binders for cements, laminates, impregnations and abrasives having low after- shrinkage have a free phenol content of less than 5% by weight and are in the form of mixed condensates of trifunctional phenols with respect to formaldehyde and alkylidenepolyphenols in a molar ratio of phenolic hydroxyl groups in the trifunctional phenols to hydroxyl groups in the alkylidenepolyphenols of 9:1 to 3:7 with formaldehyde in a molar ratio of the sum of phenolic hydroxyl groups to formaldehyde of 1:1.2 to 1:2Ø

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