Kemira Oyj

Other

Kemira Chemicals Oy

Ari Juppo

Rosa Carceller

Reijo Aksela

Aarto Parén

Jukka Jäkärä

Philip H&aring;kansson

Reetta Strengell

Ulf Stenbacka

Pontus Harju-Jeanty

The invention relates to a polymer product obtained by polymerization of i) at least one monomer selected from N-vinylformamide and vinyl acetate, and ii) maleic anhydride to give a copolymer comprising N-vinylformamide and/or vinyl acetate and maleic anhydride followed by hydrolyzing formamide groups originating from N-vinylformamide to amino groups and/or acetate groups originating from vinyl acetate to hydroxyl groups and acid anhydride to dicarboxylic acid groups to give a water-soluble copolymer comprising amine and/or hydroxyl and carboxyl groups, wherein the molar ratio of the N-vinylformamide and/or vinyl acetate monomer to the maleic anhydride monomer is from 70:30 to 30:70. The polymer product can be used as a dispersing agent or as a scale inhibiting agent.

Polymer product and the use of the same as dispersing agent

The invention provides an anionic dispersion polymerization process, wherein the polymerization is improved by an organic isothiocyanate, such as methyl isothiocyanate.

Anionic dispersion polymerization process

The invention relates to a process for the production of paper or board comprising: adding a retention system to a stream of stock entering a paper machine head box, directing the stream of stock to a wire, de watering the stream of stock on the wire to form a paper web, and drying the paper web, wherein the retention system comprises a water-soluble cationic polymer, and nanocellulose acting like a micro particle, wherein the nanocellulose is added in an amount of less than 1% as active substance based on dry solids weight of the stock.

Process for production of paper

The invention relates to a process for manufacturing liquid packaging board, in which process a board pulp is treated with a percarboxylic acid by adding to the pulp percarboxylic acid in an amount of 0.5-5 kg/ton of dry pulp, indicated as a 100 percent percarboxylic acid, whereafter, or simultaneously with the percarboxylic acid treatment, sizing is carried out with a combination of a resin size and a neutral size, which is followed by board forming. The manufactured board has good resistance to liquid penetration.

Process for manufacturing board

Hydrophobising system for paper or similar fiber product

The invention relates to a process for the manufacture of hydrophobic paper or board by using rosin sizing, an organic complexing agent being used together with the rosin size. The invention also relates to a sizing composition.

Process for the manufacture of hydrophobic paper or hydrophobic board, and a sizing composition

The invention relates to a method of producing granular mixtures which contain herbicides known per se, the activator used being a solid composition in which the activator ingredients are either impregnated into and/or mixed with a carrier material.

Growing community of inventors

Vaasa, Finland

Ari Juppo