摘要:
Polymers I comprising from 15 to 80% by weight of monomers of the general formula I ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are each C.sub.1 -C.sub.3 -alkyl, R.sup.4 is C.sub.1 -C.sub.5 -alkyl and X is O or NH, and from 20 to 85% by weight of other monomers capable of undergoing free radical copolymerization are used as assistants in the spray drying of aqueous dispersions of polymers II which differ from the polymers I.
摘要:
The present invention relates to novel comb polymers which bear poly-C2-C4-alkylene ether side chains A and functional groups B which at a pH of >12 are present in the form of anionic groups on a carbon backbone and also the salts of such comb polymers. The invention also relates to the use of these comb polymers as additives in preparations comprising a mineral binder. The polyalkylene ether side chains A have the following formula: *—U—(C(O))k—X-(Alk-O)n—Y—Z A.
摘要翻译:本发明涉及具有聚-C2-C4-亚烷基醚侧链A和官能团B的新型梳状聚合物,其pH> 12是以碳骨架上的阴离子基团的形式存在,以及其中的盐 梳状聚合物。 本发明还涉及这些梳状聚合物作为添加剂在包含矿物粘合剂的制剂中的用途。 聚亚烷基醚侧链A具有下式:* -U-(C(O))k -X-(Alk-O)n -Y-Z A
摘要:
A process for preparing free-radically polymerizable carboxylic esters by reacting ethyllenically unsaturated carboxylic acids, carboxylic anhydrides or carbonyl halides (referred to collectively as carboxylic acid component) with a hydroxyl compound composed of at least 60% by weight of C2 to C4 alkoxy groups (and referred to for short as polyalkoxy compound), which comprises said reacting taking place in the presence of a polymerization inhibitor and of a reducing agent.
摘要:
The present invention relates to a process for the preparation of poly-C2-C4-alkylene glycol monoacrylic acid esters and monomethacrylic acid esters, and a process for the preparation of copolymers of such poly-C2-C4-alkylene glycol mono(meth)acrylic acid esters with acrylic acid or methacrylic acid and the use of the polymers as a plasticizing additive in cement-containing preparations.The preparation of the poly-C2-C4-alkylene glycol monoacrylic acid esters and monomethacrylic acid esters is effected by reacting acrylic anhydride or methacrylic anhydride ((meth)acrylic anhydride A below) with a poly-C2-C4-alkylene glycol compound P carrying at least one OH group in the presence of a base, the base being selected from basic compounds which have a solubility in the poly-C2-C4-alkylene glycol compound P of not more than 10 g/l at 90° C., and the molar ratio of (meth)acrylic anhydride A to compound P (molar ratio A:P) being in the range from 1:1 to 1.095:1, preferably in the range from 1.005:1 to 1.09:1, in particular in the range from 1.01:1 to 1.085:1 and particularly preferably in the range from 1.02:1 to 1.08:1.The preparation of copolymers of (meth)acrylic acid with poly-C2-C4-alkylene glycol mono(meth)acrylic acid esters comprises: i) preparation of a poly-C2-C4-alkylene glycol mono(meth)acrylic acid ester by reacting (meth)acrylic anhydride A with a poly-C2-C4-alkylene glycol compound P carrying at least one OH group in the presence of a base by processes according to the invention, and ii) free radical copolymerization of the poly-C2-C4-alkylene glycol mono(meth)acrylic acid ester obtained in step i) with acrylic acid and/or methacrylic acid and, if appropriate, further ethylenically unsaturated monomers.
摘要:
A process for the preparation of a readily water-redispersible polymer powder by spray drying of an aqueous polymer dispersion in the presence of a novel spray drying assistant.
摘要:
The invention relates to the use of microcapsules with latent heat storage materials as capsule cores on gypsum plasterboards, gypsum plasterboards containing the same and a method for production thereof.
摘要:
A readily water-redispersible and water-wettable polymer powder is prepared by spray-drying of an aqueous dispersion of polymer particles with admixing of a hydrophilic and of a hydrophobic antiblocking agent.
摘要:
An aqueous polymer dispersion, wherein the dispersion contains from 0.0001 to 1 mol of a hydrolyzable silicon group and from 0.0001 to 1 mol of a urea or thiourea group, based, in each case, on 100 g of the polymer present in the dispersion.
摘要:
A multi-stage emulsion polymer containing at least one first domain having a glass transition temperature Tg of from −10 to +40° C. and at least one second domain having a Tg of from +50 to 120° C., the weight ratio of the first domain to the second domain being within the range from 90:10 to 50:50. The first and/or the second domain containing from 0.1 to 10% by weight of a nitrogen-coutaining adhesion monomer and the first domain containing at least 10% by weight of vinyl aromatic compounds and/or the second domain containing at least 15% by weight of vinyl aromatic compounds and/or C4 to C12 alkylmethacrylates.
摘要:
Polymer powders which are redispersible in an aqueous medium are prepared by drying an aqueous polymer dispersion whose polymer particles dispersed in the aqueous medium have a positive or a negative electric surface charge, with the addition of a water-soluble polyelectrolyte as a drying assistant, the electric charge of the polyion being opposite to the electric surface charge of the disperse polymer particles.