Wacker-chemie Gmbh

Consortium Fur Elektrochemische Industrie Gmbh

Wacker Polymer Systems Gmbh & Co. Kg

Klaus Marquardt

Peter Ball

Manfred Selig

Abdulmajid Hashemzadeh

Konrad Alfons Wierer

Joachim Schulze

Manfred Hannebaum

Gunther Staudinger

Bernward Deubzer

Hans-Peter Weitzel

Herbert Eck

Franz-Heinrich Kreuzer

Klaus Adler

Rudolf Weissgerber

Harald Zeh

Oswin Sommer

Eckhart Louis

Hubert Wiest

Richard Goetze

Klaus Hafener

Albin Frank

Fritz Stallbauer

Josef Christ

Hermann Meyer

Gunter Dressnandt

Walter Keil

Franz Heinrich Kreuzer

Werner Bathelt

Otmar Killermann

Anton Eglseder

Wilhelm Sittenthaler

The invention relates to a process for producing wood fiberboard by pressing wood fibers which have been treated with binder, in which the wood fibers are boiled and milled at elevated temperature under steam pressure in a refiner unit, subsequently are transferred to a blow-line, then dried and finally pressed under pressure and, if desired, at elevated temperature to produce boards, wherein the treatment with binder is carried out using a multi-component binder, preferably with one component A) containing functional groups which are nonreactive at elevated temperature and a second component B) containing functional groups which are reactive at elevated temperature the component A) being added in the refiner unit at a temperature of from 120&#xb0; C. to 200&#xb0; C. prior to the milling step, during the milling step, or shortly after the milling step in the front section of the blow-line and component B) being added at a lower temperature of not more than 150&#xb0; C. at the end of the blow-line or during or after the drying of the wood fibers.

Process for producing wood particleboard

Wood particleboard is produced by a process wherein wood particles, optionally comminuted, are treated with a crosslinkable thermoplastic binder comprising A), a copolymer of one or more comonomer units selected from vinyl esters of optionally branched C alkylcarboxylic acids (meth)acrylic esters of optionally branched C alcohols, dienes, olefins, vinylaromatics and vinyl halides, and from 0.1 to 50% by weight, of one or more units comprising carboxyl, hydroxy or NH groups, and B), a compound having at least two reactive groups which can react with carboxyl, hydroxy or NH groups, and selected from epoxy, N-methylol, isocyanate and ethylene carbonate groups.

The invention relates to a fast-drying rendering and coating composition comprising a binder in the form of an aqueous polymer dispersion or of a water-redispersible polymer powder, and also an organic precipitant, if desired in combination with an inorganic precipitant.

Fast-drying rendering and coating composition

A process is provided for the production of a graft copolymer by means of emulsion polymerization. The graft base used is a sulfonate group-containing vinyl ester/ethylene latex which is stabilized exclusively by an anionic emulsifier (CMC.gtoreq.0.5% by weight in H.sub.2 O) and is grafted, preferably with vinyl chloride, without further addition of emulsifier or protective colloid. The graft copolymers according to the invention have good water resistance and very good thermoplastic processability. They are useful as impact modifiers and for the production of articles, such as, soft to semi-hard moldings.

Process for emulsion polymerization of graft copolymers

A finely-divided, monomodal protective-colloid stabilized aqueous dispersion of a copolymer of at least 75% by weight of units of vinyl chloride and ethylene and optionally copolymerized with up to 25% by weight of units of additional monomers unsaturated at the ethylene bond and having a solids content of 45 to 70% by weight, characterized in that the dispersions are not partially flocculated, the polymer has a mean particle size of 150 to 500 nm measured as mean weight in a disc centrifuge and a polydispersion index of not more than 1.8 and less than 50% of the polymer particles are larger than 1,000 nm and a process for the preparation thereof using a single step radical polymerization of vinyl chloride, ethylene and optionally additional monomers such as vinyl esters useful as dispersion powders, adhesives, binders and concrete additives.

Finely-divided vinyl chloride-ethylene copolymers stabilized by

Novel pressure-sensitive aqueous adhesive dispersions comprising 40 to 65% by weight, based on the dispersion weight, of a copolymer produced by radical emulsion polymerization of ethylene, vinyl esters of saturated carboxylic acids of 2 to 12 carbon atoms, ethylenically unsaturated carboxylic acids, ethylenically unsaturated hydroxyalkyl functional compounds, optionally present (meth)acrylic acid esters with alkyl of 4 to 12 carbon atoms and optionally present mono- or poly-ethylenically unsaturated compounds having a second order transition temperature of -20.degree. to -60.degree. C. and a K value of 50 to 180, characterized in that the copolymer was obtained by polymerization of

Novel adhesive dispersions

Aqueous copolymer dispersions suitable for use in the manufacture of adhesives or as binding agents or as coating substances are produced by the emulsion polymerization of from 1 to 50% by weight of ethylene and from 99 to 50% by weight of vinyl monomers. With the process of the invention, in which, as vinyl monomers, vinyl chloride and, if desired, other ethylenically-unsaturated monomers, for example esters, are used, a higher ethylene content in the copolymer can be obtained at a lower pressure than hitherto. For this purpose, the greater part of the vinyl monomers is metered in and, in addition, an inert organic substance is used.

Process for the manufacture of aqueous copolymer dispersions and their

A novel process for the preparation of a readily dispersible, pourable dispersion powder comprising emulsion polymerizing in the presence of a free radial initiator a mixture of 1 to 50% by weight of ethylene and 99 to 50% by weight of an ethylenically unsaturated comonomer phase comprising at least one member of the group consisting of (a) 60 to 100% by weight of vinyl chloride, (b) 0 to 40% by weight of monoethylically unsaturated, oil-soluble monomers, (c) 0 to 10% by weight of monoethylenically unsaturated water-soluble monomers having functional groups and (d) 0 to 5% by weight of oil-soluble monomers that are monoethylenically unsaturated and have functional groups or are multiple ethylenically unsaturated and optionally a protective colloid and/or emulsifier at an ethylene pressure of 10 to 150 bar to obtain an aqueous dispersion of a vinyl chloride-ethyelene copolymer, optionally adding to the aqueous dispersion (e) 0 to 40% by weight, based on the VCE-polymer, of at least one water-soluble substance having a T.sub.g .gtoreq.60.degree. C., (f) 0 to 1% by weight, based on the VCE-polymer, of an antifoaming agent, and (g) 0 to 30% by weight, based on the total weight of polymer constituents, of a finely divided antiblocking agent and spray drying or freeze drying the aqueous dispersion to obtain the readily redispersible, pourable powder of a vinyl chloride-ethylene copolymer and the powder produced by the said process and improved coatings, paints, glues and adhesives containing the said redispersible powder.

Process for emulsion polymerization

A process for the preparation of finely-divided aqueous copolymer dispersions with a solids content of 10 to 70% by weight, based on the dispersion, comprising emulsion polymerizing (a) 1 to 50% by weight of ethylene and (b) 99 to 50% by weight of at least two ethylenically unsaturated comonomers in the presence of a free-radial initiator and at least one member of the group consisting of emulsifier and a protective colloid and optionally present conventional adjuvants, the ethylenically unsaturataed comonomers being (b1) 79.5 to 99.5% by weight of vinyl chloride, (b2) 0 to 15% by weight of ethylenically unsaturated oil-soluble monomers, (b3) 0.5 to 10% by weight of ethylenically unsaturated, functional, water-soluble monomers and (b4) 0 to 5% by weight of oil-soluble monomers monoethylenically unsaturated and containing functional groups or polyethylenically unsaturated and mixtures thereof with the proviso that the monomers of (b2) and (b4) are copolymerizable with (a) and (b1), the comonomers being initially present in 1 to 40% by weight and the content of the water-soluble monomers being 1 to 35% by weight of the comonomers phase initially present and the rest of component (b) being added as an aqueous emulsion during polymerization and the polymerization is effected at 0.degree. to 120.degree. C. with an ethylene pressure of 10 to 150 bar which is built up at the latest by the point in time at which polymerization of the initial material is complete.

Novel polymerization process

Silicone containing paint compositions containing aqueous dispersions of

Silicone-containing paint compositions

A process for the production of an emulsion polymerization aqueous copolymer dispersion with a solids contents of 45-55% by weight of

Novel aqueous dispersions

A process for the preparation of aqueous solutions of N-methylol-acrylamide and/or N-methylol-methacrylamide comprising forming a homogeneous mixture of aqueous solution of formaldehyde and aqueous solution of acrylamide and/or methacrylamide and passing the homogeneous mixture through an ion-exchange resin bed based on a styrene-divinylbenzene polymer with tertiary amino groups at an elevated temperature so that the reaction is at least 80% theoretically completed when the mixture issues from the bed, characterized in that the ion exchanger is initially in the form of its free base, the initial temperature and velocity of the homogeneous mixture being adjusted to maintain the bed temperature between 35.degree. and 60.degree. C. and continuing the passage of the homogeneous mixture through the exchanger bed until the bed temperature drops and/or the pH of the exiting solution is below 8.

Preparation of aqueous N-methylol amide solutions

Aqueous dispersions containing from 30% to 70% by weight of cross-linkable copolymers based on esters of (meth)acrylic acid comprising esters of (meth)acrylic acid and/or styrene, and other ethylenically-unsaturated compounds copolymerizable therewith and from 1% to 15% by weight based on the total weight of the copolymer, of allyl esters of .alpha.-hydroxycarboxylic acids. These dispersions can be used as a base of stoving enamels, which can be hardened to obtain coats of great surface hardness and great flexibility on metals.

Aqueous dispersions of cross-linkable copolymers based on

The invention relates to a process for the preparation of polymers from polymerizable urethanes prepared by reacting isocyanates having at least two isocyanato groups with polyesters of the formula ##STR1## wherein R is alkylene having from 2 to 10 carbon atoms, A is an ethylenically-unsaturated radical, and n is an integer of from 1 to 100.

Process for the preparation of polymers containing urethane groups

Copolymers according to the invention contain a new crosslinking system based on carbonamide and/or N-methylol carbonamide groups in the copolymer, the crosslinked polymers containing the following structural units ##STR1## in which R represents a straight-chain or branched aliphatic hydrocarbon radical having 0 to 9 carbon atoms,

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Burghausen, Germany

Klaus Marquardt