Abstract:
The present invention relates to an aqueous dispersionobtained by a process comprising the steps of (a) preparing an acidic copolymer (A) by radical copolymerization of monomers comprising: (a1) at least one unsaturated fatty acid, (a2) at least one ethylenically unsaturated monomer containing at least one acid group or group capable of forming an acid group, (a3) at least one other ethylenically unsaturated monomer different from (a1) and (a2), (b) neutralizing totally or partially the acid groups of copolymer (A) and dissolving it in water, (c) copolymerizing in the solution obtained at step (b) a monomer mixture different from the monomer mixture of step (a) to form a copolymer (B)as well as blends based on such dispersions, especially in combination with oxidatively drying alkyds.
Abstract:
Beschrieben wird ein Verfahren zur Herstellung einer wässrigen Verdicker-Dispersion aus einer Monomerzusammensetzung aus wenigstens einer ethylenisch ungesättigten Carbonsäure und wenigstens einem ethylenisch ungesättigten hydrophoben Monomer, wobei man (i) aus 10 bis 80 Gew.-% der Monomerzusammensetzung eine zumindest teilweise polymerisierte Voremulsion herstellt und (ii) die Restmenge der Monomerzusammensetzung vollständig zu der zumindest teilweise polymerisierten Voremulsion zugibt und eine radikalische Polymerisation initiiert. Vorzugsweise umfasst die Monomerzusammensetzung auch ein Assoziativmonomer. Das Verfahren vermeidet Nachteile einer chargenweisen Polymerisation, wie ungenügender Batch-to-Batch-Reproduzierbarkeit und Sicherheitsprobleme.
Abstract:
The present invention concerns a grafted polymer and its use in polymer/liquid crystal composite films and more particularly in PDLC films, said grafted polymer comprising (alkyl)acrylic acid or (alkyl)acrylamide moieties wherein at least one of said moieties is grafted with an alkylphenol or with an alkoxylated alkylphenol.
Abstract:
The present invention provides an elastomeric material obtainable by curing a composition comprising a mixture of a liquid precursor of a glass ionomer cement and a powdered precursor of a glass ionomer cement, said liquid precursor comprising at least one polymerisable monomer present in a range of between 2 to 50 % by weight of said liquid precursor of a glass ionomer cement, a carboxylic acid polymer, and an aqueous solvent, wherein said liquid precursor of a glass ionomer cement and said powdered precursor of a glass ionomer cement are present in a ratio of between about 2.5:1 and about 1:1 by weight.
Abstract:
Die Erfindung betrifft ein als Netz- und Dispergiermittel einsetzbares Copolymer enthaltend i) 40-73 Mol-% einer Basisstruktureinheit (A) sowie ii) 27-60 Mol-% einer substituierten Dicarbonsäurederivatstruktureinheit (B), wobei die Struktureinheit (B) Spezies mit Bisamidstruktur sowie Spezies mit quarternisierten Aminogruppen enthält.
Abstract:
The present invention relates to modified alkyd polymers and compositions thereof, in which the alkyd polymers are modified with polyol-containing latex compositions and/or diol-containing latex compositions. The invention further relates to compositions prepared from such modified alkyd compositions.
Abstract:
A process is disclosed for producing an aqueous, autoxidatively drying emulsion polymer, preferably used as binder for lacquers. A carboxyl group-containing solution polymer is first produced by polymerizing an addition product from unsaturated fatty acids and unsaturated monomers with another substance, and then an emulsion polymerization of unsaturated monomers is carried out with this solution polymer. According to the invention, the degree of neutralization of the solution polymer is set before the emulsion polymerization by admixture of a base, in particular amines or ammonia, especially aqueous ammonia, at 0.4 to 0.9, in particular 0.7. Coatings produced with such a lacquer are characterized by remarkable properties.
Abstract:
Dental cement composition comprising (a) a polymerizable polyacidic polymer having repeating units in the polymer backbone, which are represented by the following formula (I) wherein X represents O, S, or NR', whereby R' represents a hydrogen atom or a straight or branched C 1 -C 6 alkyl group, C 3 -C 6 cycloalkyl group, or C 4 -C 8 cycloalkylalkyl group, Y is a moiety of the following formula (II) wherein L 2 represents a single bond, a straight or branched C 1 -C 6 alkylene group, or a straight or branched C 1 -C 2O alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms; L 3 represents a straight or branched C 1 -C 3 alkylene group, which may optionally include 1 to 4 atoms selected from oxygen and sulfur atoms; X' represents O, S, or NR", whereby R" represents a hydrogen atom or a straight or branched C 1 -C 6 alkyl group, C 3 -C 6 cycloalkyl group, or C 4 - C 8 cycloalkylalkyl group; m represents an integer of from 0 to 6; Z represents H or -COOH; Z' represents H or (CH 2 ) X COOH, wherein x is 0, 1, or 2, L 1 represents a single bond, a straight or branched C 1 -C 6 alkylene group, a straight or branched C 1 -C 6 alkylenylene group, or a straight or branched C 1 -C 2O alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms; and having repeating units in the polymer backbone, which are represented by the following formula (III) wherein L 4 represents a single bond, a straight or branched C 1 -C 6 alkylene group, a straight or branched C 1 -C 6 alkylenylene group, or a straight or branched C 1 -C 2O alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms; and Z" represents H or -COOH; (b) a polymerizable monomer having at least one polymerizable functional group; (c) a radical polymerization initiator.
Abstract:
The invention relates to a thermally hardenable polymer dispersion powder and the use of said powder as a binding agent in particular for fibrous and grainy materials. The binding agent in powder form is obtained by drying a polymer dispersion which comprises a carboxyl-group-containing polymerization component in addition to, optionally, a hydroxy-alkylated amine.