摘要:
The invention relates to a process for the preparation of an aqueous dispersion of a polymer P (aqueous polymer P dispersion) by radically initiated aqueous emulsion polymerization.
摘要:
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 C1-C12 alkyl acrylate or a C1-C12 alkyl 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.
摘要:
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.
摘要:
The invention relates to paper coating compounds containing at least one pigment and A) an aqueous polymer dispersion (short emulsion polymer) obtained by means of emulsion polymerization, and B) a polysilcic acid dissolved or dispersed in water or a silicon dioxide dispersed in water (referred to collectively as silicasol).
摘要:
Aqueous polymer dispersions based on copolymers formed from vinyl-aromatics and conjugated aliphatic dienes having a mean particle size of from 80 to 150 nm are obtainable by free-radically initiated emulsion copolymerization of (a) from 19.9 to 80 parts by weight of at least one vinylaromatic compound, (b) from 19.9 to 80 parts by weight of at least one conjugated aliphatic diene, (c) from 0.1 to 10 parts by weight of at least one ethylenically unsaturated acid and (d) from 0 to 20 parts by weight of at least one other monoethylenically unsaturated monomer, where the sum of the parts by weight of monomers (a), (b), (c) and (d) is always 100, in an aqueous medium in the presence of at least one degraded starch with an intrinsic viscosity η of less than 0.07 dl/g, using at least 0.9% by weight, based on all of the monomers used, of initiators selected from peroxodisulphates, peroxosulphates, azo initiators, organic peroxides, organic hydroperoxides and hydrogen peroxide, wherein at least 30% by weight of the initiators are initially charged in the aqueous medium together with the degraded starch and the monomers and the remaining initiators are metered into this initial charge under polymerization conditions. Processes for preparing this dispersion by emulsion polymerization of the monomers (a), (b), (c) and optionally (d) in the presence of a degraded starch with an intrinsic viscosity η of less than 0.07 dl/g, where a portion of the initiator is initially charged together with the aqueous solution of the degraded starch in the reactor, and the remaining initiator and the monomers are metered in under polymerization conditions, and the use of the aqueous polymer dispersions as binders, adhesives, sizes for fibres or for producing coatings.
摘要:
The present invention refers to a process for the preparation of an aqueous polymer dispersion, an aqueous polymer dispersion obtained by the process, a binder, an adhesive, a size suitable for at least one fiber, a covering, or a paper coating slip, comprising the aqueous polymer dispersion as well as the use of the aqueous polymer dispersion for the preparation of a binder, an adhesive, a size suitable for at least one type of fiber, a paint, a covering, or a paper coating slip.
摘要:
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 C1- to C20-carboxylic acids, esters of acrylic acid or of methacrylic acid with monohydric C1- to C20-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.
摘要:
The invention relates to a process for preparing an aqueous dispersion of a polymer P, which comprises the emulsion polymerization of vinyl acetate, an acrylate monomer, which is a C1-C10 alkyl acrylate or a C1-C10 methacrylate, an α,β-ethylenically unsaturated C3-C8 carboxylic acid, glycidyl methacrylate or glycidyl acrylate, optionally an ethylenically unsaturated sulfonic acid and optionally an ethylenically unsaturated other monomer. Furthermore, the aqueous polymer dispersion obtainable from this process and a powder form thereof are disclosed. They are useful for a paper coating slip containing one of the aforementioned forms. A paper or a cardboard, which is coated with the paper coating slip, shows surface strength, which is expressed by a good dry pick resistance, a good wet pick resistance or good offset test results. The aqueous polymer dispersion or the powder form thereof is furthermore useful as a binder.
摘要:
What is described is a method for preparing aqueous polymer dispersions, wherein a vinyl aromatic compound such as styrene, a conjugated aliphatic diene such as butadiene and an ethylenically unsaturated carboxylic acid nitrile such as acetonitrile are copolymerized in an aqueous medium. The copolymerization is done in the presence of a decomposed starch and radical-forming initiators. At least a portion of the various monomers of ethylenically unsaturated carboxylic acid nitriles are polymerized before the ethylenically unsaturated carboxylic acid nitriles are added to the polymerization mixture.