Abstract:
Feinteilige, stärkehaltige Polymerdispersionen, die erhältlich sind durch radikalisch initiierte Emulsionspolymerisation von ethylenisch ungesättigten Monomeren in Gegenwart mindestens eines Redoxinitiators und Stärke, wobei man als ethylenisch ungesättigte Monomere (a) 30 bis 60 Gew.-% mindestens eines gegebenenfalls substituierten Styrols, (b) 1 bis 60 Gew.-% mindestens eines Acrylsäure-C 1 -C 12 -alkylesters und/oder Methacrylsäure-C 1 -C 12 -alkylesters, (c) 0 bis 10 Gew.-% mindestens eines anderen ethylenisch ungesättigten copolymerisierbaren Monomers, und als Stärke (d) 15 bis 40 Gew.-% mindestens einer abgebauten Stärke einsetzt, die eine MoImasse M w von 1 000 bis 65 000 g/mol hat, wobei die Summer (a) + (b) + (c) + (d) = 100 % beträgt und sich auf den Gesamtfeststoffgehalt bezieht, und wobei die Polymerisation in Gegenwart von mindestens 0,01 Gew.-%, bezogen auf die eingesetzten Monomeren, mindestens eines Terpenhaltigen Polymerisationsreglers durchgeführt wird, Verfahren zur Herstellung der feinteiligen, stärkehaltigen Polymerdispersionen durch Emulsionspolymerisation der Monomeren (a), (b) und (c) mit Redoxinitiatoren in Gegenwart von (d) abgebauter Stärke und mindestens 0,01 Gew.-%, bezogen auf die eingesetzten Monomeren, mindestens eines Terpen-haltigen Polymerisationsreglers, sowie Verwendung der feinteiligen, stärkehaltigen Polymerdispersionen als Leimungsmittel für Papier, Pappe und Karton.
Abstract:
The invention relates to a finely divided, starch-containing aqueous polymer dispersion which is obtainable by free radical emulsion polymerization of ethylenically unsaturated monomers in the presence of at least one redox initiator and starch, wherein the ethylenically unsaturated monomers comprise (a) from 30 to 65% by weight of acrylonitrile and/or methacrylonitrile, (b) from 35 to 60% by weight of at least one C 1 -C 12 -alkyl acrylate and/or at least one C 1 -C 12 -alkyl methacrylate, (c) from 0 to 35% by weight of at least one other ethylenically unsaturated copolymerisable monomer, in which the sum of (a), (b) and (c) totals 100%, and in which the aqueous polymer dispersion comprises, (d) from 10 to 55% by weight of an ionic tapioca starch, in which the weight of (d) is based on the total solids of components (a), (b), (c) and (d) of the aqueous polymer dispersion. The invention also relates to a process for the manufacture of the finely divided, starch containing aqueous polymer dispersions and also to the use of said finely divided starch containing aqueous polymer dispersions as a size for paper, board and cardboard.
Abstract:
AKD cellulosic composition obtainable by flowing a stream of a cellulosic suspension through a shearing device and in which a molten alkyl ketene dimer (AKD) is metered in to the stream of cellulosic suspension in or prior to the shearing device. The AKD cellulosic composition is particularly suitable in the manufacture of sized paper and paperboard.
Abstract:
Feinteiligen, kationischen, wässrigen Polymerdispersionen, die erhältlich sind durch Emulsionspolymerisation von ethylenisch ungesättigten Monomeren in einer wässrigen Lösung eines kationischen Vorpolymerisats als Dispergiermittel, wobei zunächst das kationische Vorpolymerisat in Gegenwart von Polymerisationsinitiatoren durch Polymerisieren von (a) 15 bis 40 Gew.-% einer Mischung von mindestens zwei verschiedenen (Meth)acrylsäureestern, die jeweils eine Aminogruppe und/oder quartäre Ammoniumgruppe aufweisen, und/oder (Meth)acrylamiden, die jeweils eine Aminogruppe und/oder quartäre Ammoniumgruppe tragen, (b) 40 bis 85 Gew.-% mindestens eines gegebenenfalls substituierten Styrols, (c) 0,5 bis 5 Gew.-% mindestens eines Säuregruppen enthaltenden ethylenisch ungesättigten Monomers und (d) 0 bis 20 Gew.-% mindestens eines von (b) verschiedenen, nichtionischen, ethylenisch ungesättigten Monomers, wobei die Summe aus (a) + (b) + (c) + (d) = 100 Gew.-% ergibt, in einer Lösungspolymerisation in einem mit Wasser teilweise bis vollständig mischbaren Lösemittel hergestellt wird, die Lösung/Dispersion des Vorpolymerisats dann mit Wasser versetzt wird und anschließend in der wässrigen Lösung des Vorpolymerisats eine Emulsionspolymerisation in Gegenwart von Polymerisationsinitiatoren eines Monomerengemisches aus (i) 0 bis 29 Gew.-% mindestens eines gegebenenfalls substituierten Styrols, (ii) 50 bis 100 Gew.-% mindestens eines C 1 - bis C 18 -(Meth)acrylsäureesters, (iii) 0 bis 30 Gew.-% mindestens eines Vinylesters linearer oder verzweigter C 1 -C 30 -Carbonsäuren und (iv) 0 bis 30 Gew.-% mindestens eines von (i), (ii) und (iii) verschiedenen, nichtionischen ethylenisch ungesättigten Monomers, wobei die Summe aus (i) + (ii) + (iii) + (iv) = 100 Gew.-% ergibt, und die Lösungspolymerisation und/oder Emulsionspolymerisation in Gegenwart von 0 bis 10 Gew.-% mindestens eines Polymerisationsreglers durchgeführt wird.
Abstract:
Beschrieben wird eine haftklebende Schutzfolie, gebildet aus einer Polymerfolie, welche mit einer vernetzten Haftklebstoffzusammensetzung beschichtet ist. Die Haftklebstoffzusammensetzung enthält ein Haftklebstoffpolymer, welches gebildet ist durch Emulsionspolymerisation in Gegenwart von Stärke aus weichen Monomeren, welche, wenn sie als Homopolymer polymerisiert sind, eine Glasübergangstemperatur von weniger als 0°C aufweisen, aus ethylenisch ungesättigten Säuren oder Säureanhydriden und optional weiteren, von (i) und (ii) verschiedenen Monomeren. Die Haftklebstoffzusammensetzung enthält bestimmte Vernetzer, wobei die durch den Vernetzer bewirkte Vernetzungsreaktion beendet ist, bevor die haftklebende Schutzfolie auf ein Substrat aufgeklebt wird.
Abstract:
The present invention which provides antifoaming agents for the paper industry, based on oil-in- water emulsions, in which the oil phase accounts for from 5 to 50% by weight of the emulsion if the oil phase of the emulsions contains (a) an alcohol of not less than 12 carbon atoms, fatty esters of alcohols of not less than 22 carbon atoms and C 1 -C 36 -carboxylic acids, distillation residues which are obtainable in the preparation of alcohols having a relatively large number of carbon atoms by the oxo synthesis or by the Ziegler method and which may furthermore be alkoxylated, a mixture of the stated compounds and (b) optionally a fatty ester of a C 12 -C 22 -carboxylic acid with a monohydric to trihydric C 1 -C 18 -alcohol and, (c) optionally a hydrocarbon having a boiling point above 200°C or a fatty acid of 12 to 22 carbon atoms, in combination with from 1 to 80% by weight of component (d) comprising (d1) polyglyceryl esters which are obtainable by not less than 20% esterification of a polyglycerol mixture of from 0 to 10% by weight of monoglycerol, from 15 to 40% by weight of diglycerol, from 30 to 55% by weight of triglycerol, from 10 to 25% by weight of tetraglycerol, from 0 to 15% by weight of pentaglycerol, from 0 to 10% by weight of hexaglycerol and from 0 to 5% by weight of polyglycerols having higher degrees of condensation with one or more fatty acids of 12 to 36 carbon atoms; and (d2) C 18 -C 30 alkyl behenate. The antifoaming agents can be used for preventing foam in pulp cooking, in the beating of pa- per stock, in papermaking and in the dispersing of pigments for papermaking. Further, the anti- foaming agents can be used for preventing foam in paper stocks.
Abstract:
A finely divided, starch-containing polymer dispersion which is obtainable by free radical emulsion polymerization of ethylenically unsaturated monomers in the presence of at least one redox initiator and starch, wherein (a) from 0 to less than 40% by weight of at least one optionally substituted styrene, (b) from greater than 60 to 100% by weight of at least one C 1 -C 12 -alkyl acrylate and/or C 1 -C 12 -alkyl methacrylate, (c) from 0 to 10% by weight of at least one other ethylenically unsaturated copolymerizable monomer, are used as the ethylenically unsaturated monomers, the sum (a) + (b) + (c) being 100% and being based on the active monomer content and (d) from 15 to 40% by weight of at least one degraded starch which has a molar mass M w of from 1000 to 65 000 g/mol, based on the total weight of solids content of components (a) + (b) + (c) + (d), are used as the starch, and the polymerization being carried out in the presence of at least 0.01% by weight, based on the monomers used, of at least one terpene containing chain-transfer agent, and in which the polymer dispersion optionally comprises an aluminium compound. The use of the finely divided, starch-containing polymer dispersions as sizes for paper, board and cardboard is also claimed.
Abstract:
A finely divided, cationic or amphoteric, aqueous polymer dispersion which is obtainable by emulsion polymerisation of ethylenically unsaturated monomers in the presence of a cationic or amphoteric protective colloid, wherein first the cationic or amphoteric protective colloid is prepared by polymerising a monomer blend in the presence of at least one first polymerisation initiator in an organic solvent, and is carried out in a pressurised reactor at a pressure of at least 1720 kPa and at a temperature of at least 150°C, which monomer blend comprises at least one ethylenically unsaturated monomer carrying an amine group,, to provide a resin, then combining the resin, with an acid and water, to form the cationic or amphoteric protective colloid, thereafter carrying out an emulsion polymerisation by introducing a monomer mixture into an aqueous medium containing said cationic or amphoteric protective colloid and at least one second polymerisation initiator, wherein said monomer mixture comprises at least one ethylenically unsaturated water insoluble monomer. The composition is useful as a sizing agent for paper.
Abstract:
The present invention which provides antifoaming agents for the paper industry, based on oil-in-water emulsions, in which the oil phase accounts for from 5 to 50% by weight of the emulsion if the oil phase of the emulsions contains (a) an alcohol of not less than 12 carbon atoms, fatty esters of alcohols of not less than 22 carbon atoms and C1-C36-carboxylic acids, distillation residues which are obtainable in the preparation of alcohols having a relatively large number of carbon atoms by the oxo synthesis or by the Ziegler method and which may furthermore be alkoxylated, a mixture of the stated compounds and (b) optionally a fatty ester of a C12-C22-carboxylic acid with a monohydric to trihydric C1-C18-alcohol and, (c) optionally a hydrocarbon having a boiling point above 200° C. or a fatty acid of 12 to 22 carbon atoms, in combination with from 1 to 80% by weight of component (d) comprising (d1) polyglyceryl esters which are obtainable by not less than 20% esterification of a polyglycerol mixture of from 0 to 10% by weight of monoglycerol, from 15 to 40% by weight of diglycerol, from 30 to 55% by weight of triglycerol, from 10 to 25% by weight of tetraglycerol, from 0 to 15% by weight of pentaglycerol, from 0 to 10% by weight of hexaglycerol and from 0 to 5% by weight of polyglycerols having higher degrees of condensation with one or more fatty acids of 12 to 36 carbon atoms; and (d2) C18-C30 alkyl behenate. The antifoaming agents can be used for preventing foam in pulp cooking, in the beating of paper stock, in papermaking and in the dispersing of pigments for papermaking. Further, the anti-foaming agents can be used for preventing foam in paper stocks.
Abstract:
The invention relates to finely divided starch-containing polymer dispersions, which can be obtained by the radically initiated emulsion polymerization of ethylenically unsaturated monomers in the presence of at least one redox initiator and starch, wherein the ethylenically unsaturated monomers used are (a) 30 to 60% by weight of at least one optionally substituted styrol, (b) 1 to 60% by weight of at least one acrylic acid-C 1 -C 12 -alkyl ester and/or methacrylic acid-C 1 -C 12 -alkyl ester, (c) 0 to 10% by weight of at least one other ethylenically unsaturated copolymerizable monomer, and the starch used is (d) 15 to 40% by weight of at least one degraded starch having a molar mass M w of 1000 to 65000 g/mol, wherein the sum (a) + (b) + (c) + (d) = 100% and relates to the total solid matter content, and wherein the polymerization is carried out in the presence of at least 0.01% by weight, relative to the monomers used, of at least one terpene-containing polymerization regulator. The invention further relates to a method for producing the finely divided starch-containing polymer dispersions by means of the emulsion polymerization of monomers (a), (b) and (c) using redox initiators in the presence of (d) degraded starch and at least 0.01% by weight, relative to the monomers used, of at least one terpene-containing polymerization regulator, and to the use of the finely divided starch-containing polymer dispersions as a sizing agent for paper, paperboard and cardboard.