Basf Se Corporation

Basf Aktiengesellschaft

Basfaktiengesellschaft

Juergen Schmidt-Thuemmes

Dirk Lawrenz

Elitsa Evstatieva

Rainer Blum

Hermann Seyffer

Carmen-Elena Cimpeanu

Anton Esser

Guido Funk

Christoph Hamers

Rainer Konrad

Gernot Koehler

Guenter Eckert

Theo Smit

Joerg Nieberle

Nico Veling

Joachim Pakusch

Roland Ettl

Peter Bauer

Guenther Schweier

Wolfgang Gaschler

Norbert Mahr

Lothar Schlemmer

Roland Saive

Klaus-Dieter Hungenberg

Heinrich Sack

Norbert Hasenbein

Martin Meister

Rudolf Mueller-Mall

Rabie Al-Hellani

Hubertus Kroener

Hans-Juergen Denu

Wolfram Dietsche

Ralf Hemel

Anja Song

Albrecht Zosel

Guillermo Arens

Jun Gao

Markus Koppers

Kristina Georgieva

Aurélie Morel

Dieter Meck

Norbert Gispert

Xiang-Ming Kong

Johannes Jan-Bessel Minderhoud

The invention relates to a use of a coating layer on a paper substrate for blocking oxygen transfer through the coated paper substrate, wherein the coating layer on the paper substrate is obtainable by a process, which comprises the steps of (a) providing a paper substrate with a surface, (b) applying onto the surface of the provided paper substrate an aqueous coating mass, and (c) drying of the paper substrate with the applied aqueous coating mass to obtain the coated paper substrate, wherein the aqueous coating mass contains an aqueous dispersion of a copolymer P, which is obtainable by radically initiated emulsion polymerization of at least 40 parts by weight of styrene and 22 to 49 parts by weight of butadiene and optionally other monomers based on the sum total of the parts by weight of all monomers, which is always 100, in the presence of a first degraded starch. It relates further to a coated paper substrate obtainable with a coating mass comprising the aqueous dispersion of the copolymer P and a further saccharide, which is added after the polymerization of the monomers. It relates also to a process for manufacturing the coated paper substrate obtainable with a coating mass comprising the aqueous dispersion of the copolymer P and the further saccharide.

Use of a coating layer with a styrene-butadiene copolymer on a paper substrate for blocking oxygen transfer

The invention relates to a use of a coating layer on a paper substrate for blocking oxygen transfer through the coated paper substrate, wherein the coating layer on the paper substrate is obtainable by a process, which comprises the steps of (a) providing a paper substrate with a surface, (b) applying onto the surface of the provided paper substrate an aqueous coating mass, and (c) drying of the paper substrate with the applied aqueous coating mass to obtain the coated paper substrate, wherein the aqueous coating mass contains an aqueous dispersion of a polymer P, which is obtainable by radically initiated emulsion polymerization of at least 25 parts by weight of a C-Calkyl acrylate or a C-Calkyl methacrylate based on the sum total of the parts by weight of all monomers, which is always 100, in the presence of a first degraded starch. It relates further to a coated paper substrate obtainable with a coating mass comprising the aqueous dispersion of the polymer P and a further saccharide, which is added after the polymerization of the monomers. It relates also to a process for manufacturing the coated paper substrate obtainable with a coating mass comprising the aqueous dispersion of the polymer P and the further saccharide.

Use of a coating layer with an acrylate polymer on a paper substrate for blocking oxygen transfer

Described is an aqueous polymer dispersion comprising a chain growth addition polymer obtainable via free-radically initiated emulsion polymerization from ethylenically unsaturated, free-radically polymerizable monomers, wherein the chain growth addition polymer is formed to an extent of not less than 60 wt % from primary monomers selected from vinylaromatic compounds, conjugated aliphatic dienes, vinyl esters of saturated C- to C-carboxylic acids, esters of acrylic acid or of methacrylic acid with monohydric C- to C-alcohols, aliphatic hydrocarbons having 2 to 8 carbon atoms and one or two double bonds, or mixtures thereof, wherein the monomers are polymerized in the presence of lignosulfonate and wherein the chain growth addition polymer is branched or crosslinked. Also described is a process for preparing the aqueous polymer dispersion. The polymer dispersion is useful for preparing paper coating compositions.

Aqueous polymer dispersion obtainable by free-radically initiated emulsion polymerization in the presence of lignosulfonate

Described are aqueous polymer dispersions and methods of making them. The polymer dispersions are obtainable by free-radically initiated emulsion polymerization of 19.9 to 80 parts by weight of vinylaromatic compounds, 19.9 to 80 parts by weight of acrylate monomers selected from C1-C10 alkyl acrylates and C1-C10 alkyl methacrylates, 0.1 to 10 parts by weight of ethylenically unsaturated acids, and 0 to 20 parts by weight of other ethylenically unsaturated monomers, wherein the emulsion polymerization is effected in an aqueous medium in the presence of free-radical initiators, seed latex and also at least one carbohydrate compound in the form of a degraded starch. The polymer dispersions are particularly useful in the manufacture of paper coating slips.

Polymer dispersions of vinylaromatic compounds and acrylate monomers prepared in the presence of seed latex and carbohydrate compounds

Aqueous slurries of finely divided fillers which are at least partly covered by anionic latices, the slurries being obtainable by treating aqueous slurries of finely divided fillers with at least one anionic latex with a glass transition temperature of &#x2212;5 to &#x2212;50&#xb0; C., preparation of the aqueous slurries and their use as an additive to the paper stock in the production of filler-containing paper, filler-containing cardboard or filler-containing board by draining the paper stock.

Aqueous suspensions of fine-particulate fillers, method for the manufacture thereof and use thereof for the manufacture of filler-containing papers

A process for the preparation of aqueous polymer dispersions is described, a vinylaromatic compound, such as, for example, styrene, a conjugated aliphatic diene, such as, for example, butadiene, and an ethylenically unsaturated carbonitrile, such as, for example, acrylonitrile, being copolymerized in an aqueous medium. The copolymerization is effected in the presence of a degraded starch and of free radical initiators. At least part of the monomers differing from ethylenically unsaturated carbonitriles are polymerized before the ethylenically unsaturated carbonitriles are added to the polymerization mixture.

Process for the preparation of aqueous polymer dispersions from a aromatic compound, a conjugated aliphatic diene and an ethylenically unsaturated carbonitrile

Aqueous slurries of finely divided fillers which are at least partly covered by anionic latices, the slurries being obtainable by treating aqueous slurries of finely divided fillers with at least one anionic latex which comprises, incorporated in the form of polymerized units, at least one monomer comprising phosphonic and/or phosphoric acid groups, preparation of the aqueous slurries and their use as an additive to the paper stock in the production of filler-containing paper, filler-containing cardboard or filler-containing board by draining the paper stock.

Aqueous suspensions of fine-particulate fillers, method for the manufacture thereof and use thereof for the manufacture of fluid-containing papers

Process for the production of filler-containing papers and filler-containing paper products by addition of an aqueous suspension of at least one finely divided polymer-pigment hybrid to a paper stock and drainage of the paper stock with sheet formation, the polymer-pigment hybrid being obtainable by milling an aqueous suspension of at least one inorganic pigment in the presence of at least one binder and, if appropriate, by drying the aqueous suspension thus obtainable and redispersing the dried polymer-pigment hybrid in water, and the use of the polymer-pigment hybrids thus obtainable as a filler for the production of filler-containing paper or filler-containing paper products.

Polymer-pigment hybrids for use in papermaking

The present invention provides a novel one-step process for preparing an aqueous polymer dispersion by the free radical aqueous emulsion polymerization comprising mixing at least water, a dispersant, and an oil-soluble initiator; raising a temperature from the starting to the end reaction temperature while metering at least ethylenically unsaturated monomers and a water-soluble initiator into a reaction vessel, conducting polymerization of the monomers in the presence of the water-soluble initiator at a temperature up to the end reaction temperature, and when the temperature has reached the end reaction temperature, conducting polymerization by the oil-soluble initiator. The oil-soluble initiator is inactive at the starting reaction temperature and becomes more active as a temperature approaches the end reaction temperature at which the oil-soluble initiator is fully active.

Free-radical polymerization process producing aqueous polymer dispersion with low residual monomer content utilizing oil and water soluble initiators

Aqueous polymer dispersions based on copolymers of vinyl aromatics and conjugated aliphatic dienes having a mean particle size of from 80 to 150 nm, obtained by free radical emulsion copolymerization of

Aqueous polymer dispersions based on copolymers formed from vinylaromatics and conjugated aliphatic dienes, processes for preparation thereof and use thereof

A paper coating slip comprising at least one inorganic pigment and, based on 100 parts by weight of the inorganic pigments, less than 40 parts by weight of organic polymers, and less than 25 parts by weight of water or other solvents having a boiling point below 150&#xb0; C. at 1 bar.

Paper coating slip based on pigment-polymer hybrids

Aqueous polymer dispersions which are obtainable by free radical copolymerization of

Aqueous polymer dispersions, based on copolymers of vinyl aromatics and butadiene, method for their production and their use as sizing agents for paper

A process for preparing a polymer powder by evaporating the volatile constituents from an aqueous dispersion of a film-forming polymer P, wherein prior to the evaporation of the volatile constituents the aqueous polymer dispersion still comprises drying assistants T, present in an amount of from 0.1 to 80% by weight, based on the polymer P of the dispersion, and there being used as drying assistant T polyvinylformamide. The polyvinylformamide used preferably has a K value (KW), determined by the method of Fikentscher in accordance with DIN 53726, of from 5 to 50.

Preparation of polymer powders

An aqueous polymer dispersion gives a film having high resilience in conjunction with reduced surface tack and good aging resistance under the action of light, heat and oxygen and is used for coating leather.

Aqueous polymer dispersion

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Neuhofen, Germany

Juergen Schmidt-Thuemmes