Pulp and papermaking additive

Abstract

An antifoam/defoam composition used also as a drainage aid in pulp and papermaking process lines which consists of a water-base composition useful in the pH range 7.0-9.0. The milieu in which the composition is utilized such as e.g. black liquor, may be kept at a pH of 4.0-12.0. The composition is as follows: Hydrophobic silica Bisamide of the following formula: ##STR1## where N IS AN INTEGER FROM 1 TO 6; AND R is a saturated or unsaturated, straight or branched chain hydrocarbyl group having from 5 to 22 carbon atoms. Acid containing crosslinked copolymer of acrylic acid Dioctyl sulfosuccinate Paraffin oil Water More particular formulae are also set out below: ______________________________________ (A) Hydrophobic silica 0-30% Ethylene-bis-stearamide .001-50% Acid containing crosslinked acrylic acid polymer .05-10% Dioctyl sulfosuccinate .05-10% Paraffin oil .001-99% H.sub.2 O .001-99% (B) Hydrophobic silica 4-12% Ethylene-bis-stearamide 4-12% Acid containing crosslinked acrylic acid polymer .25-3% Dioctyl sulfosuccinate .25-3% Paraffin oil 41-35% H.sub.2 O 50-40% (C) Hydrophobic silica 4.5% Ethylene-bis-stearamide 1% Acid containing crosslinked acrylic acid polymer 1% Dioctyl sulfosuccinate 1% Paraffin oil 42.5% H.sub.2 O 50% ______________________________________

Dependencies are inferred from the claim text.