Process for trash removal or pitch-like resin control in the paper manufacture
AssigneeChemische Fabrik Stockhausen GmbH
InventorsHans-Georg Hartan, Alfons Landscheidt
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for trash removal or pitch control in the paper manufacture, in which process as agent for the trash removal or pitch control cationic groups containing polymers of 50 to 100%-wt. quaternized dimethylaminopropylmethacrylamide or dimethylaminopropylmethacrylamide and 0 to 50%-wt acrylamide, acrylic acid, methacrylic acid, acrylamidomethylpropanesulfonic acid, are used, which polymers have an intrinsic viscosity of smaller than 150 ml/g. The trash removal or pitch control agent is added to the pulp flow and/or the circuit water in amounts of up to 1%-wt., relative to the dry weight of the paper manufactured.
Claims10
In the manufacture of paper wherein paper pulp is contacted with water and chemicals resulting in production of by-product trash comprising dissolved or colloidally dissolved anionic oligomers or polymers and non-ionic hydrocolloids, which trash is contained in the water, and the water is re-cycled, the method of preventing excessive build-up of the trash in the recycled water which comprises incorporating into the re-cycled water a polymer consisting essentially of
- a) 50 to 100%-wt. quaternized dimethylaminopropylacrylamide or dimethylaminopropylmethacrylamide and
- b) 0 to 50%-wt. acrylamide, acrylic acid, methacrylic acid, acrylamidomethylpropanesulfonic acid, or mixtures of these monomers,
- the polymer exhibiting an intrinsic viscosity of at most about 100 ml/g as determined in a 10 wt % NaCl solution.
Dependencies are inferred from the claim text.