摘要:
A heat-curable binder based on an aqueous polymer dispersion comprising an emulsion polymer (EP), a polymer composed of at least 5% by weight of an ethylenically unsaturated monocarboxylic acid, dicarboxylic acid or dicarboxylic anhydride (acid polymer SP for short), and monofunctional or polyfunctional epoxide compounds as curatives. The monofunctional or polyfunctional epoxide compound is stirred, preferably in the liquid state, into the aqueous polymer dispersion. Besides the epoxide compound, the heat-curable binder may further comprise a polyol or an alkanolamine as hardener.
摘要:
A heat-curable binder based on an aqueous polymer dispersion comprising an emulsion polymer (EP), a polymer composed of at least 5% by weight of an ethylenically unsaturated monocarboxylic acid, dicarboxylic acid or dicarboxylic anhydride (acid polymer SP for short), and monofunctional or polyfunctional epoxide compounds as curatives. The monofunctional or polyfunctional epoxide compound is stirred, preferably in the liquid state, into the aqueous polymer dispersion. Besides the epoxide compound, the heat-curable binder may further comprise a polyol or an alkanolamine as hardener.
摘要:
The invention relates to a process for preparing an aqueous polymer dispersion comprising an emulsion polymer a polymer composed of at least 5% by weight of an ethylenically unsaturated monocarboxylic acid, dicarboxylic acid or dicarboxylic anhydride (acid polymer SP for short), and an alkoxysilane of the formula SiR1R2R3R4 in which the groups R1 to R4 independently of one another are each an organic radical with the proviso that at least one of the groups is an alkoxy group, which comprises preparing said emulsion polymer by emulsion polymerization in the presence of at least some of the alkoxysilane.
摘要:
Mesoporous silica has a specific surface area of the mesopores of at least 500 m.sup.2 /g and a volume of the mesopores of at least 1.0 ml/g and is prepared by converting a silica precursor in a water-containing reaction medium, the reaction medium containing a polymer dispersion.
摘要:
The present invention relates to aqueous binder compositions which are based on aqueous polymer dispersions, to processes for preparing them, and to their uses. The aqueous binder composition comprises: a) a water-insoluble polymer P in the form of dispersed polymer particles, i.e., in the form of an aqueous polymer dispersion, the polymer P being obtainable by polymerization of ethylenically unsaturated monomers M, the monomers M comprising: 90% to 99.9% by weight, more particularly 92% to 99.5% by weight and especially 93% to 99% by weight, based on the total amount of monomers M, of at least one neutral, monoethylenically unsaturated monomer M1 of low water-solubility; and 0.1% to 10% by weight, more particularly 0.5% to 7% by weight and especially 1% to 5% by weight, based on the total amount of monomers M, of at least one monoethylenically unsaturated monomer M2 which is selected from monoethylenically unsaturated monomers which have at least two hydroxyl groups attached to vicinal C atoms, and monomers which carry a functional group which can be converted by hydrolysis into two hydroxyl groups attached to vicinal C atoms; and b) boric acid and/or at least one salt of boric acid.
摘要:
The present invention relates to textile two- or three-dimensional structures formed from fibers and/or ribbons and swellable materials, the fibers and/or ribbons present in the structure and also the swellable materials each being present in such an amount that the fibers and/or ribbons are encased by the swellable materials and the voids in the structure are, in the swollen state, partially or completely filled by materially bound water and the swellable materials used being aqueous emulsions of (co)polymers of at least one ethylenically unsaturated monomer MON which are applied to the fibers and/or ribbons.
摘要:
The present invention relates to the use of an aqueous polymer dispersion comprising dispersed particles of at least one polymer A1 having a glass transition temperature, Tg, of from −20° C. to +35° C. and obtainable through free-radical emulsion polymerization in the presence of a polymer A2 synthesized from from 50 to 99.5% by weight of at least one ethylenically unsaturated monocarboxylic and/or dicarboxylic acid whose carboxylic groups can form an anhydride group, or mixtures thereof, from 0.5 to 50% by weight of at least one ethylenically unsaturated compound selected from the esters of ethylenically unsaturated monocarboxylic acids and the monoesters and diesters of ethylenically unsaturated dicarboxylic acids with an amine containing at least one hydroxyl group, and up to 20% by weight of at least one further monomer as binder for producing abrasive material.
摘要:
In a process for preserving a mineral molding by coating the surface of the mineral molding with an aqueous composition comprising an aqueous polymer dispersion, the dispersed polymer P comprises an ethylenically unsaturated acid of the 2-acrylamido-2-methylpropanesulfonic acid type polymerized into it in free-radically polymerized form.
摘要:
In a process for preserving a mineral molding by coating the surface of the mineral molding with an aqueous composition comprising an aqueous polymer dispersion, the dispersed polymer P comprises an ethylenically unsaturated acid of the 2-acrylamido-2-methylpropanesulfonic acid type polymerized into it in free-radically polymerized form.
摘要:
Used as latent heat storage media of microcapsules I comprising as core materials one or more lipophilic substances whose solid/liquid phase transition is within the range from −20 to 120° C. and as shell a polymer obtainable by free-radical polymerization of a monomer mixture comprising from 30 to 100% by weight, based on the overall weight of the monomers, of one or more C1-C24-alkyl esters of acrylic and/or methacrylic acid (monomer I), from 0 to 80% by weight, based on the overall weight of the monomers, of a bi- or polyfunctional monomer (monomers II) which is insoluble or of low solubility in water, and from 0 to 40% by weight, based on the overall weight of the monomers, of other monomers (monomers III), and also novel microcapsules Ia, spray-dried microcapsules Ia′, processes for their preparation and shaped articles and coating compositions comprising these microcapsules.