Low-contaminant resols for cements
AssigneeHoechst Aktiengesellschaft
InventorsWolfgang Hesse, Klaus Rauhut
Life of this patent
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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.
Claims12
A resol for cements, laminates, impregnations and abrasives having low aftershrinkage having a free phenol content of less than 5% by weight and being in the form of mixed condensates of at least one trifunctional phenol 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.
Dependencies are inferred from the claim text.