Nitrogenous condensation products used as retention aids in papermaking
AssigneeBASF SE
InventorsEmil Scharf, Rolf Fikentscher, Werner Auhorn, Werner Streit
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Abstract
Production of water-soluble crosslinked auxiliaries for the papermaking industry by reacting A. one equivalent of NH groups of a polyalkylene polyamine having from 15 to 500 alkyleneimine units with B. from 0.001 to 0.08 mole of a reaction product obtained from a polyalkylene oxide having from 8 to 100 alkylene oxide units with epichlorohydrin, In aqueous solution at a temperature of from 20.degree. to 100.degree. C. The viscosity of an aqueous solution containing 20% by weight of the crosslinked auxiliaries is from 300 to 1,500 centipoises (20.degree. C).
Claims3
A process for the production of paper which comprises adding as drainage and retention aids to an aqueous suspension of cellulosic fibers for making paper sheet, from about 0.01 to 0.3% by weight, based on the dry weight of cellulosic fiber in the pulp, of a water-soluble crosslinked reaction product obtained by reacting
- a. one equivalent of NH groups of a polyalkylene polyamine having from 15 to 500 alkyleneimine units wherein said polyalkylene polyamine is an imine homopolymer with
- b. from 0.001 to 0.08 mole of a product obtained by reacting a polyalkylene oxide having from 8 to 100 alkylene oxide units with epichlorohydrin such that from 1.0 to 1.5 moles of epichlorohydrin are present per equivalent of the hydroxyl groups in the polyalkylene oxide,
- at a temperature of from 20.degree. to 100.degree. C in aqueous solution having a solids content of from 5 to 50% by weight, the reaction being carried to a point at which the viscosity of an aqueous solution containing 20% by weight of the auxiliary is from 300 to 1,500 centipoises (20.degree. C).
Dependencies are inferred from the claim text.