Abstract:
Described is a method of preparing polymers of aspartic acid by heating (a) maleic acid anhydride with (b) acid derivatives of ammonia or adsorption media charged with ammonia, essentially to form hemi-amides of maleic acid or fumaric acid or ammonium salts of the hemi-amides of these acids, followed by thermal condensation of the hemi-amides or their salts, optionally in the presence of co-condensable compounds.
Abstract:
The invention concerns polycocondensates of aspartic acid, obtained by condensing aspartic acid in the presence of carboxylic-group-containing polymers which include at least 10 mol % of a monoethylenically unsaturated carboxylic acid polymerized into the polymer and have a molecular weight of at least 300, in the ratio by weight of 1000:1 to 2:1. The invention also concerns methods of producing such polycocondensates and the use of the polycocondensates, in a form with free acid groups or in a form with the acid groups neutralized with ammonia, amines, alkali-metal bases or alkaline-earth bases, as an additive in washing and cleaning agents, as scale inhibitors or as dispersants for finely divided solids.
Abstract:
The present invention relates to a metal oxide support material containing nanoscaled iron-platinum group metal particles having a particle size in the range of 0.5 to 10 nm, whereas at least 70 % of all nanoscaled iron-platinum group metal particles are located on a outside surface layer of the metal oxide support material, whereas the outside surface layer has an averaged volume of less than 50 % based on the total volume of the metal oxide support material. In addition, the present invention relates to a process for preparation of such metal oxide support material containing nanoscaled iron-platinum group metal particles. Furthermore, the present invention relates to the use of metal oxides containing nanoscaled iron-platinum group metal particles as catalysts, for example as a diesel oxidation catalyst for the treatment of exhaust gas emissions from a diesel engine.
Abstract:
Mischungen, umfassend: a) Stücke von offenzelligem Aminoplastschaumstoff mit einem mittleren Durchmesser im Bereich von 50 µm bis 5 mm (Gewichtsmittel), b) Wasser, c) mindestens ein Tensid und d) gegebenenfalls eine Öl- oder Fettphase.
Abstract:
The invention concerns polymers which contain cyclodextrin groups and are obtained by: (a) deprotonation of cyclodextrins or modified cyclodextrins with bases, with the exclusion of water; and (b) reaction of the deprotonated cyclodextrins or cyclodextrin derivatives obtained in (a) with polymers containing reactive groups in the absence of water. The invention further concerns a process for preparing the polymers containing cyclodextrin groups and the use of the polymers containing cyclodextrin groups as gel-forming agents and thickeners for the molecular encapsulation of active substances in the field of pharmacy, cosmetics and plant protection, as well as detergent additives, softener additives and as textile and laundry after-treatment agents.
Abstract:
The invention concerns water-absorbent cellular crosslinked-polymer materials produced by (I) foaming a polymerizable aqueous mixture containing: (a) acid-group-containing monoethylenically unsaturated monomers which have been neutralized to at least 50 mol %; (b) optionally, other monoethylenically unsaturated monomers; (c) crosslinking agents; (d) initiators; (e) 0.1 to 20 % by wt. of at least one surfactant; (f) optionally, at least one solubilizer and (g) optionally, thickeners, foam stabilizers, polymerization-control agents, fillers and/or cell-nucleation agents, the foaming being carried out by dispersing throughout the mixture fine bubbles of a gas which is inert to radicals, and (II) polymerizing the foamed mixture to form a cellular hydrogel and adjusting the water content of the cellular hydrogel to 1 to 45 % by wt. The invention also concerns methods of producing such polymer materials and their use in personal-hygiene articles used to absorb body fluids and in bandage material used to cover injuries.
Abstract:
The invention concerns biologically degradable polyester amides P1 obtainable through reaction of a mixture consisting essentially of the following: (a1) a mixture consisting essentially of: 35-95 mol % adipic acid or ester-forming derivatives thereof or mixtures thereof, 5-65 mol % terephthalic acid or ester-forming derivatives thereof or mixtures thereof, and 0-5 mol % a compound containing sulphonate groups (the sum of the individual molar percentages is 100); (a2) a mixture consisting essentially of: (a21) 99.5-0.5 mol % a dihydroxy compound chosen from the group comprising C2-C6 alkane diols and C5-C10 cycloalkane diols, (a22) 0.5-99.5 mol % an amino C2-C12 alkanol or an amino-C5-C10 cycloalkanol, (a23) 0-50 mol % a diamino C1-C8 alkane; and (a24) 0-50 mol % a 2,2`-bisoxazoline of general formula (I), in which R is a single bond, a (CH2)q-alkylene group in which q = 2, 3 or 4, or a phenylene group (the sum of the individual molar percentages is 100 and the molar ratio of a1 to a2 is in the range 0.4:1 - 1.5:1). The polyester amides P1 will have a molecular weight (Mn) in the range 4000-40,000 g/mol, a viscosity number in the range 30-350 g/ml (measured in o-dichlorobenzene/phenol (weight ratio 50/50) at a concentration of 0.5 wt.% polyester amide P1 at a temperature of 25 DEG C) and a melting point in the range 50-220 DEG C; and a quantity of a compound D equivalent to 0-5 mol % of the molar quantity of components (a1) must also be used for the production of the polyester amides P1, said compound D having at least three groups capable of ester formation. The invention also concerns other biologically degradable polymers and thermoplastic moulding materials, processes for manufacturing the same, the use thereof for producing biologically degradable moulded articles and adhesives, and biologically degradable moulded articles, foams and blends with starch which can be obtained from the polymers or moulding materials according to the invention.
Abstract:
Described is a method for the preparation of modified polyaspartic acids by condensing aspartic acid with polybasic carboxylic acids or anhydrides of polybasic carboxylic acids and ammonia, essentially at temperatures of at least 140 DEG C in the absence of inorganic acids.
Abstract:
Disclosed is a method for producing condensation polymers of aspartic acid by means of condensation polymerization of aspartic acid at temperatures of 140 DEG C in the presence of, relative to aspartic acid, from 1 to less than 5 mol % phosphorous acid or hypophosphorous acid catalyst, and the use of the resulting condensation polymers of aspartic acid as additives in washing and cleaning products, amounting to 0.1 to 10 wt % relative to the washing and cleaning products.
Abstract:
Diclosed is a method for producing condensation polymers of aspartic acid by means of condensation polymerization of aspartic acid at temperatures of 140 to 300 DEG C in the presence of a sulfuric acid catalyst partially neutralized with ammonia and/or amines and the use of the reaction mixtures thus produced or of the reaction mixtures neutralized with alkali metal bases or alkaline earth metal bases as additives in phosphate-free or low-phosphate detergents and cleaners.