Water soluble amphoteric emulsion terpolymers, methods of making, and methods of use as retention and dewatering aids

A method of papermaking, which method comprises adding a water-soluble emulsion terpolymer or aqueous composition comprising the water-soluble amphoteric emulsion terpolymer according to any of the previous claims during any phase of a manufacturing process for paper or board, wherein the water-soluble emulsion terpolymer or aqueous composition functions as:

• (a) a dry strength agent for paper or board;
• (b) an anti-stickie agent;
• (c) a fixation and retention/drainage boosting aid, wherein said water-soluble emulsion terpolymer or aqueous composition functions as a fixative for improving retention and/or fixation of dyes, hydrophobics, starch and/or fillers, and/or drainage in manufacture of paper and/or board, optionally wherein said aid does not damage sheet formations even at elevated polymer dosage levels;
• or
• (d) any combination of the foregoing.

A method of using a water-soluble amphoteric emulsion terpolymer or aqueous composition comprising the water-soluble amphoteric emulsion terpolymer according to any of the previous claims, wherein the water-soluble amphoteric emulsion terpolymer or aqueous composition functions:

• (a) as an internal sizing booster and press aid in papermaking for paper or board;
• (b) as a press aid in a papermaking process;
• (c) for colloidal particle control, optionally in a papermaking process;
• (d) as a drainage aid;
• optionally in a papermaking process;
• (e) for eliminating or controlling deposit formation caused e.g., by hydrophobic substances in manufacture of paper or board;
• (f) for improving drainage in manufacture of paper and/or board;
• (g) as a pump and go composition for paper or board manufacturing, wherein the pump and go composition is added to a fiber stock, a thick stock, or a coated broke without use of conventional polymer aging tanks;
• (h) for improving sizing efficiency in paper or board manufacturing;
• or
• (i) as a flocculant, optionally in water purification or water quality management.

A method for manufacture of paper or board, wherein a fiber web is formed from an aqueous suspension of fibers, the method comprising:

• (a) providing an aqueous fiber suspension, which comprises recycled fiber material and/or coated broke;
• (b) optionally diluting the aqueous fiber suspension;
• (c) delivering the aqueous fiber suspension to a headbox, draining the aqueous fiber suspension on a wire screen to form a wet fibrous web;
• and
• (d) pressing and drying the wet fibrous web to obtain a web of paper or board,
• wherein the method further comprises adding a water-soluble amphoteric emulsion terpolymer or an aqueous composition comprising the water-soluble amphoteric emulsion terpolymer according to any of the previous claims;
• and
• wherein optionally:
• (i) the aqueous fiber suspension comprises at least 50 weight-%, preferably at least 60 weight-%, more preferably at least 70 weight-%, or even more preferably at least 80 weight-% or 100 weight-%, of recycled fiber material and/or coated broke, based on dry paper or board;
• (ii) the water-soluble amphoteric emulsion terpolymer or aqueous composition is added to the aqueous fiber suspension, wherein the aqueous fiber suspension comprises a consistency of (1) above 30 g/L, (2) above 20 g/L, or (3) below 20 g/L;
• (iii) the water-soluble amphoteric emulsion terpolymer or aqueous composition is added to the aqueous fiber suspension before washing and/or cleaning and/or thickening of the aqueous fiber suspension;
• (iv) the water-soluble emulsion polymer or aqueous composition is added to the aqueous fiber suspension in a dosage of 0.9-2.72 kg (as is)/ton or 1.36-2.72 kg (as is)/ton of produced paper or board;
• or
• (v) any combination of (i) to (iv).

A method for improving vacuum and press dewatering in manufacturing of paper or board, which method comprises:

• (a) providing an aqueous fiber suspension, which optionally comprises recycled fiber material;
• (b) delivering the aqueous fiber suspension to a last shear stage and further to a headbox;
• (c) draining the aqueous fiber suspension on a wire to form a wet fibrous web;
• and
• (d) further dewatering the wet fibrous web by using vacuum and wet pressing and drying,
• characterised in that an amphoteric polymer or a cationic crosslinked polymer is added to the fiber suspension having consistency of <20 g/L before the last shear stage prior to delivering the fiber suspension to a headbox of a paper or board machine,
• wherein the amphoteric polymer or cationic crosslinked polymer are obtained by polymerizing at least acrylamide and over 11 mol-% of cationic monomers, and
• wherein the amphoteric polymer or cationic crosslinked polymer comprise a standard viscosity of 1.5-4.5 mPas.

A method for manufacture of paper or board, wherein a fiber web is formed from an aqueous suspension of fibers, the method comprising:

• (a) providing an aqueous fiber suspension, which comprises recycled fiber material and/or coated broke;
• (b) optionally diluting the aqueous fiber suspension;
• (c) delivering the aqueous fiber suspension to a headbox, draining the aqueous fiber suspension on a wire screen to form a wet fibrous web;
• and
• (d) further dewatering the wet fibrous web by vacuum dewatering, wet pressing, and/or drying the wet fibrous web to obtain a paper or board;
• wherein the method further comprises adding to the aqueous fiber suspension a retention and drainage aid comprising (i) a water-soluble amphoteric emulsion terpolymer, and (ii) one or more inorganic colloids;
• and
• wherein (i) and (ii) are premixed prior to addition or added simultaneously or sequentially in any order.