Reducing the deposition of pitch-like resins in the production of paper.

摘要

Pitch-like resin deposits are reduced or prevented during the papermaking process by adding to the papermaking slurry from 0.5 to 20 parts per million by weight of a self-inverting emulsion containing a polyampholyte of the formula: <CHEM> where DMDAAX<(-)> is a polymer unit resulting from monomeric dimethyldiallylammonium X<(-)>; DEDDAAX<(-)> is a polymer unit resulting from monomeric diethyldiallylammonium X<(-)>; X is an anion; M<(+)> is hydrogen; ammonium; sodium; or potassium; k and l together total 50 weight percent, and m and n together total 50 weight percent; while k is from 45 to 48 weight percent and l is from 2 to 5 weight percent; and while m is from 45 to 50 weight percent and n is from 0 to 5 weight percent; said polyampholyte having a molecular weight greater than 1 x 10<6>.