Low-contaminant resols for cements

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

1994-11-14

1995-12-26

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528129, 528153, 523400, 523424, C08G 804, C08G 1404

Patent

active

054789087

ABSTRACT:
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 1:2.0.

REFERENCES:
patent: 4302380 (1981-11-01), Hesse et al.
patent: 4596840 (1986-06-01), Hesse et al.

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