Kemira Oyj

Kemira Chemicals Oy

Other

Sateri International Co. Ltd.

Aarto Parén

Ilkka Renvall

Jukka Jäkärä

Jonni Ahlgren

Jukka Jakara

Reijo Aksela

Jukka Rautiainen

Ari Juppo

Timo Härmä

Reetta Strengell

Jussi Nikkarinen

Jukka J&auml;k&auml;r&auml;

Riitta Laitinen

Asko Peltonen

Anna Ilomäki

Tapio Viitanen

Juha Patola

Anna Sundquist

Minna Sankari

Heli Virkki

Hannu Hämäläinen

Seung-Hoon Lee

Timo Partanen

Hannu Hamalainen

Anna Ilomaki

Heli Koskinen

The invention relates to a stabilizing composition comprising following components  The invention also relates to a process for the treatment of a fiber material.

Composition and process for the treatment of fibre material

The present invention relates to a stabilizing composition comprising following components (A) a polymer having following formula wherein Ris a hydrogen atom or an alkyl group containing 1 to 12 carbon atoms, Ris &#x2014;COOM or &#x2014;CHCOOM, M is a hydrogen atom, an alkali metal ion, an alkaline earth metal ion, an ammonium ion or a mixture thereof, n, m and k are molar ratios of corresponding monomers, wherein n is 0 to 0.95, m is 0.05 to 0.9, and k is 0 to 0.8, and (n+m+k) equals 1, and the weight average molecular weight is between 500 and 20,000,000 g/mol, (B) a chelating agent, and (C) an alkaline earth metal compound. The invention also relates to a process for the treatment of a fiber material.

The invention relates to a process for the treatment of a fibre material comprising the step of contacting the fibre material in an aqueous medium with a chelating agent and a polymer having following general formula wherein The invention also relates to a composition comprising a chelating agent and the above polymer.

Process for the treatment of fibre material and new composition

The present invention relates to a polymer composition for peroxide bleaching of a cellulosic fiber material, said composition being in the form of a stable aqueous polymer solution obtained by bringing in an aqueous medium a first polymer (A) comprising a partly or totally acidic homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, into contact with a second polymer (B) comprising a polylactone of a poly-alfa-hydroxyacrylic acid in solid form or as a moist powder or as a slurry, said polymer solution having a pH of at most 5. The invention also relates to peroxide bleaching processes.

Polymer composition for peroxide bleaching of cellulosic fibre material and processes for peroxide bleaching

A method for manufacturing silicate-containing fiber, wherein silicon dioxide is added to viscose manufactured of cellulose, and the formed mixture of viscose and silicon dioxide is directed via nozzles to a regeneration solution, to which silicate is added.

Method for manufacturing silicate-containing fiber

The present invention relates to a process for bleaching a cellulosic fibre material with a peroxide compound in an aqueous alkaline medium, comprising a bleaching step wherein: a) a first polymer (A) comprising a homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, and a solution of a second polymer (B) comprising a poly-alpha-hydroxyacrylic acid or a salt thereof, are added to a cellulosic fibre material, and b) thereafter adding a peroxide compound and an alkaline substance and carrying out the bleaching.

Bleaching of cellulosic fibre material with peroxide using polymers as a stabiliser

The present invention relates to a polymer composition for peroxide bleaching of a cellulosic fiber material, said composition being in the form of a stable aqueous polymer solution obtained by bringing in an aqueous medium a first polymer (A) comprising a partly or totally acidic homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, into contact with a second polymer (B) comprising a polylactone of a poly-alfa-hydroxyacrylic acid in solid form or as a moist powder or as a slurry, said polymer solution having a pH of at most 8, The invention also relates to peroxide bleaching processes.

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

Methods for the preparation of an N-alkyl-N-bis-(2-( 1,2-dicarboxy-ethoxy)-ethyl)-amine derivative are described, products of the methods as well as uses of the products. The derivative is prepared by reacting an alkali or earth alkali metal salt of maleic acid with an N-substituted diethanolamine, the reaction taking place with the two ethanol groups of the diamine while the substituent group bound to the N atom remains unaffected, or alternatively by first reacting diethanolamine with an alkali or earth alkali metal salt of maleic acid to yield N-bis-(2-(1,2-dicarboxy-ethoxy)-ethyl)-amine, which is then reacted with a substitution reagent to obtain the final product. The derivative is useful as chelating agents, e.g., in the bleaching of chemical or mechanical pulp or in textile bleaches containing hydrogen peroxide or a peracid, or as a calcium binder in detergents and cleaning agents.

Methods for the preparation of an N-bis-&lsqb;2-(1,2-dicarboxy-ethoxy)-ethyl&rsqb;amine derivative and products of the methods and their uses

A process for the bleaching of chemical pulp, in which process the pulp is delignified with a peracid and additionally the pulp is chelated in order to bind heavy metals, such as Fe, Mn and/or Cu, into a chelate complex. According to the invention, the chelating is carried out using a chemical which has been selected from a group consisting of N-bis-((1,2-dicarboxy-ethoxy)-ethyl)-amine, N-bis-((1,2-dicarboxy-ethoxy)-ethyl)-aspartic acid and N-tris-((1,2-dicarboxy-ethoxy)-ethyl)-amine, as well as the alkali metal and earth-alkali metal salts thereof, and the peracid and chelating treatments are carried out simultaneously by combining the peracid and the said chelating chemical in the same solution phase. In the bleaching sequence the treatment according to the invention may follow, for example, an ozone delignification and precede an alkaline peroxide step, and in the latter case a magnesium compound, such as MgSO,, may be added to the pulp before the alkali step.

Process for the peracid bleaching of chelated chemical pulp

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.

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Vaasa, Finland

Aarto Parén