Abstract: A pasty single component polyurethane adhesive is provided. The NCO terminated polyurethane prepolymer is substantially linear, contains from 2.0% to 8.0% based on the weight of the prepolymer, of highly disperse silica and up to 10% by weight, based on the weight of the prepolymer, of additives. The one component adhesive has an Expressed Volume of at least 2,000 g/min measured according to DIN EN 29048 and a Creep Resistance measure according to DIN EN 27390 below 6.0 after 5 minutes.

Abstract: A one-pack polyurethane adhesive containing a polyisocyanate prepolymer and at least one aminoether polyol, having a molar ratio of ether groups to amino nitrogen in the aminopolyether polyol of 7 to 30.

Abstract: A polyurethane prepolymer obtainable by reacting at least one aromatic polyisocyanate having symmetrical substitution of NCO groups and at least one aromatic polyisocyanate having asymmetric substitution of NCO groups, the fraction of aromatic polyisocyanate having symmetrical substitution of NCO groups being higher than the fraction of polyisocyanate having asymmetric substitution of NCO groups, and at least one polyol having an OH functionality of more than 2.5 and at least one polyol having an OH functionality of less than 2.5.

Abstract: A method for increasing an adhesive to a substrate is disclosed which utilizes a hydrophilic, high molecular weight, nonionic polyurethane adhesive. The polyurethane adhesive is soluble in water and a 1% by weight solution of the adhesive in water at 20% has a specific viscosity of at least 0.4. The nonionic polyurethane contains the following structural units: a) —O—(CH2—CH2O)n where n is 8 to 500; b) —CO—NH—X—NHCO— where X is an aliphatic or cycloaliphatic group; and c) —O—Y—O— wherein Y comprises a hydrophobic moiety from the groups (—CH2—CH(CH3)—O)m—CH2—CH(CH3)—, (—CH2 CH(C2H5)—O)m—CH2—CH(C2H5)—, (—CH2—CH2—CH2—CH2O)m—CH2CH2CH2CH2—, alkylene groups having from 2 to 44 carbon atoms, cycloalkylene groups having from 6 to 44 carbon atoms and mixtures thereof.

Abstract: A polyurethane prepolymer obtainable by reacting at least one aromatic polyisocyanate having symmetrical substitution of NCO groups and at least one aromatic polyisocyanate having asymmetric substitution of NCO groups, the fraction of aromatic polyisocyanate having symmetrical substitution of NCO groups being higher than the fraction of polyisocyanate having asymmetric substitution of NCO groups, and at least one polyol having an OH functionality of more than 2.5 and at least one polyol having an OH functionality of less than 2.5.

Abstract: A one-pack polyurethane adhesive containing a polyisocyanate prepolymer and at least one aminoether polyol, having a molar ratio of ether groups to amino nitrogen in the aminopolyether polyol of 7 to 30.

Abstract: A method of applying an adhesive to a substrate is disclosed which utilizes a hydrophilic, high molecular weight, nonionic polyurethane adhesive. The polyurethane adhesive is soluble in water and a 1% by weight solution of the adhesive in water at 20% has a specific viscosity of at least 0.4.

Abstract: The invention relates to a pasty single-component polyurethane adhesive based on at least one polyurethane pre-polymer with an NCO terminal and at least one thickener, in addition to optionally at least one additive. According to the invention, A) the polyurethane pre-polymer with an NCO terminal is substantially linear, B) the thickener is a highly disperse silicic acid in a concentration of between 2.0 and 8.0% by weight in relation to the pre-polymer, and C) the additive constitutes less than 10% by weight in relation to the pre-polymer. The invention thus fulfils the practical requirements for an adhesive used for construction and assembly, both in terms of fluidity and non-sag properties.

Abstract: A method for increasing an adhesive to a substrate is disclosed which utilizes a hydrophilic, high molecular weight, nonionic polyurethane adhesive. The polyurethane adhesive is soluble in water and a 1% by weight solution of the adhesive in water at 20% has a specific viscosity of at least 0.4.

Abstract: A method of applying an adhesive to a substrate is disclosed which utilizes a hydrophilic, high molecular weight, nonionic polyurethane adhesive. The polyurethane adhesive is soluble in water and a 1% by weight solution of the adhesive in water at 20% has a specific viscosity of at least 0.4.

Abstract: The invention relates to an agglomerate containing at least one of the following water-soluble or water-dispersible materials as a bonding base polymer: carboxylized and/or alkoxylized starch, cellulose ether and fully synthetic vinyl polymers and/or polyacrylates. The agglomerate is characterized in that it contains a blasting agent which produces a high swelling pressure, but, advantageously, does not gel. The agglomerate can have a regular geometric form or not. Its weight should be between 0.5 and 500 g. The agglomerate is used in particular in the production of lump-free paste.

Abstract: A hydrophilic, high molecular weight nonionic polyurethane, characterized by solubility in water and by a specific viscosity of at least 0.4 (1% by weight solution at 20° C.) is provided. Examples of such polyurethanes are those characterized by the following structural units: a) —O(—CH2—CH2—O)n—, where n=8 to 500, and b) —CO—NH—X—NH—CO—, where X is an aliphatic or cycloaliphatic radical. Also provided are methods of using the polyurethane as an adhesive, more particularly a hotmelt adhesive or a solvent-based adhesive, for example a wallpaper adhesive and labelling adhesive, of using polyurethane as a stabilizer in the emulsion polymerization of, in particular, vinyl acetate and vinyl chloride and in the copolymerization of ethylene and vinyl acetate, and of using the polyurethane as a thickener for aqueous systems, more particularly together with nonionic surfactants.

Abstract: The invention relates to optionally solventless two-component polyurethane surfacers containing finely divided fillers in a high pigment volume concentration based on a polyfunctional isocyanate component (B) and a polyol component (A) which is liquid at room temperature and which consists of mixture components containing isocyanate-reactive hydroxyl groups with an at least predominant content of branched-chain polyols (A1) containing ester and ether groups, which contains at least a proportion of the finely divided fillers and, optionally, the additives and which, for application, is mixed with the isocyanate component (B) and applied as a mixture which can still be processed by shaping.

Abstract: Dry products in flake or granulate form suitable as a paste base may be obtained by drying a mixture, containing approximately 30 to 80% by weight of water, of from(a) 30 to 95% by weight of carboxymethylated and/or alkoxylated starch,(b) 3 to 40% by weight of a cellulose ether, and(c) 2 to 40% by weight of a water-dispersible polymer or water-soluble polymer, and(d) optionally, conventional additives, such as preservatives, wetting agents, fillers and the like,in a thin layer on a surface heated to 80.degree. to 200.degree. C. The dry products obtained do not undergo physical separation and are readily dispersible or self-dispersible in water.