Abstract:
Disclosed is a method for producing polyaspartic acid by means of condensation polymerization of finely divided aspartic acid at temperatures above 150 DEG C in the presence of acid catalysts, the acid catalysts being first brought into contact with the finely divided aspartic acid in the reaction zone in which the condensation polymerization takes place.
Abstract:
A process is disclosed for preparing polyaspartic acid imides. A mixture of aspartic acid and phosphoric acid in a molar ratio from 1:0.8 to 1:3 is condensed at a temperature from 80 to 150 DEG C into a pre-condensate liquid in the reaction conditions, and the pre-condensate is then polycondensed under shearing at temperatures from 180 to 250 DEG C in a layer with 0.1 to 10 mm thickness.
Abstract:
Described is a method of producing maleinimide polymers by the anionic or thermal polymerization of maleinimide in the absence of solvents or thinning agents, as well as the use of hydrolysed polymaleinimides as additives to washing and cleaning agents, as scale inhibitors, as grinding auxiliaries and as dispersants for pigments.
Abstract:
Verfahren zum Passivieren von metallischen Oberflächen mit Phosphorsäure- und/oder Phosphonsäuregruppen aufweisenden Copolymeren Zusammenfassung 5 Verfahren zum Passivieren von metallischen Oberflächen und eine zur Ausführung des Verfahrens geeignete Zubereitung, welche mindestens Wasser, eine Säure sowie ein Copolymer aus funktionalisierten (Meth)acrylsäureestern, Phosphorsäure- und/oder Phosphonsäuregruppen aufweisenden Monomeren, COOH-Gruppen aufweisenden Monomeren sowie gegebenenfalls weiteren Monomeren umfasst. Copolymer, welches die genannten Monomere enthält.
Abstract:
The invention relates to a method for controlling the thickening of aqueous, silicate-containing systems, characterized in that at least one copolymer having an average molecular weight (Mw) of at least 3000 g/mol and not more than 60000 g/mol is added to said aqueous system and that the copolymer is, essentially statistically, made of monoethylenically unsaturated monocarboxylic acids, monoethylenically unsaturated dicarboxylic acids and eventually ethylenically unsaturated comonomers. The method is also characterized in that the polymerization is carried out in the presence of 0.01 to 100 mol-%, in relation to the total amount of all COOH groups of the mono- and dicarboxylic acids, of at least one base for producing the copolymer, the indicated amounts in wt.-% each referring to the total amount of all used monomers.
Abstract:
Verfahren zur Kontrolle der Eindickung wässriger Systeme, enthaltend Silikate, dadurch gekennzeichnet, dass dem wässrigen System mindestens ein Copolymer eines mittleren Molekulargewichts Mw von mehr als 60000 g/mol zugegeben wird und das Copolymer im wesentlichen statistisch aus monoethylenisch ungesättigten Monocarbonsäuren, monoethylenisch ungesättigten Dicarbonsäuren und optional weiteren ethylenisch ungesättigten Comonomeren aufgebaut ist, wobei die Mengenangaben jeweils auf die Gesamtmenge aller eingesetzten Monomere bezogen sind.
Abstract:
Flächenförmigen Formkörper, welche mindestens eine metallische Schicht, eine darauf aufgebrachte Konversionsschicht und mindestens eine Lackschicht umfassen sowie Verfahren zur Herstellung derartiger Formkörper, ausgehend von flächenförmigen, metallischen Halbzeugen.
Abstract:
A process for the reduction of the residual monomer content and enhancement of the wet strength of articles formed from water absorbent crosslinked polymer foams containing units derived from monoethylenically unsaturated acids, which comprises treating the formed articles with at least 0.5% by weight of a polymer containing primary and/or secondary amino groups and having a molar mass of at least 300, the formed foam articles thus obtainable and use of the wet strength enhanced formed foam articles in hygiene articles.
Abstract:
The aim of the invention is to produce polymeric networks. An aldehyde or a mixture of aldehydes or precursors thereof are condensed with a component (A) that contains amines, optionally in the presence of a solvent (S). The component (A) contains at least one amine (I) which can be obtained by means of amination of polymeric ethers of the 1.4 butanediol and is provided with at least two free amino groups. Said component (A) also and optionally contains at least one amine of the formula (II): Y (-NH2)n and optionally contains at least one amine of the formula (III): (Z-)(q-r)Y (-NH2)r, wherein Y means n-valued organic radicals, Y means q-valued organic radicals, Z means functional single-valued radicals, n means an integral value of 1 to 20, q means an integral value of 2 to 20 and r means an integral value of 1 to 19 with the proviso that 1
Abstract:
Formaldehyde-free aqueous binders containing: A) a polymer consisting of 5 to 100 wt% of an ethylenically unsaturated acid anhydride or an ethylenically unsaturated bicarboxylic acid, the carboxylic acid groups of which can form an anhydride group, and B) an alkanol amine with at least two hydroxyl groups.