Abstract: A process for preparing an aqueous dispersion of a higher fatty acid zinc salt which comprises adding a molten higher fatty acid to an aqueous dispersion of zinc oxide and reacting the higher fatty acid with the zinc oxide in the presence of a surfactant or a water-soluble polyvinyl alcohol with stirring while the aqueous dispersion is maintained at a temperature that is higher than the melting point of the higher fatty acid used.

Abstract: The invention provides a method for preventing pitch trouble which comprises adding to a pulp slurry a pitch-controlling agent comprising 100 parts by weight of a zinc salt of a higher fatty acid and from 1 to 20 parts by weight of a cationic surfactant.

Abstract: A method of deinking waste paper for reclamation thereof, which comprises disintegrating waste paper with an alkali in water in the presence of a polyoxyalkylene ether compound having the formulaR-O(PO)x(AO)y(PO)z-Hwherein R is an alkyl or alkenyl of 8-22 carbons, or an alkylphenyl wherein the alkyl has 4-12 carbons; PO is an oxypropylene group; and AO is an oxyethylene group, or a mixed oxyalkylene group composed of an oxyethylene group and at least one oxyalkylene group selected from the group consisting of an oxypropylene group and an oxybutylene group: and x is a numeral of 3-15, y is a numeral of 20-40, and z is a numeral of 5-20, in an amount effective as a deinking agent.

Abstract: A method of deinking waste paper for reclamation thereof, which comprises disintegrating waste paper with an alkali in water in the presence of a fatty acid polyoxyalkylene ester having the formulaR--COO(PO)x(AO)y(PO)z--Hwherein R is an alkyl or alkenyl of 7-21 carbons, PO is an oxypropylene group, AO is an oxyethylene group, or a mixed oxyalkylene group composed of an oxyethylene group and at least one oxyalkylene group selected from the group consisting of an oxypropylene group and an oxybutylene group, and x is a numeral of 1-20, y is a numeral of 1-50, and z is a numeral of 1-50, as a deinking agent.