Process of preventing formation of resinous deposits in the manufacture of paper and the like, and compositions
AssigneeBenckiser-Knapsack GmbH
InventorsErnst Hoeger, Franz Baskovic
Life of this patent
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Abstract
The difficulties encountered in the manufacture of paper, cardboard, and other cellulosic articles, as they are caused by the formation of resinous or pitch deposits on the paper as well as on the paper machines and processing apparatus, are overcome, or at least considerably reduced, by the addition of phosphonic acids and more particularly of alkyl, amino or hydroxy alkyl, or cycloalkyl phosphonic acids or their alkali metal salts. If required, amino polycarboxylic acids, hydroxy carboxylic acids, or their alkali metal salts, or alkali metal polyphosphates are also added during processing.
Claims22
In a process of preventing formation of resinous deposits and overcoming pitch trouble from a resin-containing cellulosic starting material in the manufacture of paper, cardboard, boxboard and the like, said process comprising adding to the resin-containing cellulosic starting material during processing water-soluble additive consisting essentially of a phosphonic acid compound selected from an alkylene amino phosphonic acid or an alkali metal or ammonium salt thereof in an amount between about 0.02 and about 1.0%, calculated for dry cellulosic material.
Dependencies are inferred from the claim text.