Abstract: A gear set arrangement (10) for a bicycle gearbox (400) includes a planetary assembly, a stationary component (24), a first and a second brake (B1, B2), and a first and a second freewheel clutch (F1, F2). One planetary gear set (12) of the planetary assembly includes a first rotary element, a second rotary element, and a third rotary element. The first rotary element is rotationally fixable on the stationary component (24) by the first brake (B1). The first rotary element is connectable to the output (36) by the first freewheel clutch (F1). The second rotary element is rotationally fixable on the stationary component (24) by the second brake (B2). The second rotary element is connectable to the output (36) by the second freewheel clutch (F2). The third rotary element is connected to the input (34) for conjoint rotation. The gear set arrangement (10) is configured to provide three ratios.

Abstract: An aqueous UV-curable dispersion at least includes a reaction product composed of a) at least one polyisocyanate having an average isocyanate functionality of at least 2.2, of which preferably at least one polyisocyanate is an oligomeric polyisocyanate having urethane, biuret, allophanate, iminooxadiazinedione and/or isocyanurate structural units; b) at least one monohydroxy-functional compound containing acryloyl groups, c) at least one component which contains nonionic hydrophilizing groups and has at least one further isocyanate-reactive group and d) at least one diol, triol, diamine and/or triamine, the reaction product having no ionogenic or ionically hydrophilizing groups.

Abstract: An aqueous adhesive formulation; containing a mixture of: at least one partially crystallised or crystalline polyurethane having a fusion temperature of 35 to 80° C. and an enthalpy of fusion of ?35 J/g as component A; at least one plasticiser as component B; at least one salt as component C; and optionally at least one further polymer as component D. The mixture contains: 30 to 94.9 wt. % component A; 5 to 45 wt. % component B; 0.001 to 3 wt. % component C; and optionally 0 to 30 wt. % component D, each based on the total of the amounts of the components A, B, C and optionally D present in the mixture.

Abstract: The invention relates to a process for producing a composite material for wound dressings, comprising the following steps: (I) providing a first film, having a first film surface and a second film surface running virtually parallel to the first film surface: (II) mixing an NCO-terminated polyurethane prepolymer with at least water to give a polyurethane prepolymer/water mixture, (III) applying the polyurethane prepolymer/water mixture to at least one part of the first film surface to form a layer, the layer having a first layer surface which is in contact with the first film via at least one part of the first film surface, and having a second layer surface which runs virtually parallel to the first layer surface; (IV) covering at least one part of the second layer surface with a further film, wherein the bond strength between the first film and the layer and also between the layer and the further film is greater in each case than the tensile strain at break of the layer.

Abstract: The invention relates to decorative cosmetic compositions containing specific polyurethanes or aqueous dispersions thereof and containing constituents that produce decorative effects.

Abstract: The present invention relates to a process for preparing at least one blocked polyisocyanate, comprising the following steps: (A) reacting at least one polyisocyanate with at least one thermally cleavable blocking agent to obtain at least one partially blocked polyisocyanate, (B) reacting the at least one partially blocked polyisocyanate from step (A) with at least one non-ionic hydrophilizing agent to obtain an intermediate product, and (C) reacting the intermediate product obtained in step (B) with at least one thermally cleavable blocking agent to obtain the at least one blocked polyisocyanate. The invention further relates to the use of the blocked polyisocyanate for producing coating agents, adhesives, sealants or elastomers, to corresponding coating agents, adhesives, sealants or elastomers, and to substrates that are provided with coatings obtained using the at least one blocked polyisocyanate according to the invention.

Abstract: The present invention relates to a process for preparing at least one blocked polyisocyanate, comprising the following steps: (A) reacting at least one polyisocyanate with at least one thermally cleavable blocking agent selected from the group consisting of primary, monofunctional alcohols and mixtures thereof to obtain at least one partially blocked polyisocyanate, (B) reacting the at least one partially blocked polyisocyanate from step (A) with at least one non-ionic hydrophilizing agent to obtain an intermediate product, and (C) reacting the intermediate product obtained in step (C) with at least one thermally cleavable blocking agent selected from the group consisting of primary, monofunctional alcohols and mixtures thereof, to obtain the at least one blocked polyisocyanate.

Abstract: The invention relates to a foamed, fissure-free skin-compatible article, produced by mixing a first polyurethane dispersion (A) with at least one second polyurethane dispersion (B) which differs from the first polyurethane dispersion (A), optionally with the addition of other additives, then by foaming and subsequently drying the mixture. The invention also relates to a process for preparing the foamed article and to the use thereof.

Abstract: The present invention relates to aqueous polyurethane urea dispersions based on polyester polyols, which dispersions result in low emissions and are used as coating compositions.

Abstract: The present invention relates to a composition, a process for its production, and use thereof. The composition comprises water, a polyurethane polymer and a water-soluble salt of a chelating agent, said polyurethane polymer having a hydrolyzable group, said polyurethane polymer is a reaction product comprising the following reactive components: Component A) an isocyanate, Component B) a compound having an isocyanate-reactive group, wherein said compound comprises at least one group that can be converted to said hydrolyzable group, optionally Component C) an emulsifier, optionally Component D) a solvent, and optionally Component E) a reactive diluent; wherein said water-soluble salt of the chelating agent is present in an amount of from 0.04 to 1.8% by weight, relative to 100% by weight of said polyurethane polymer.

Abstract: The invention relates to a method for producing a polyurethane dispersion, comprising the steps: I) providing polyurethane polymers and/or polyurethane prepolymers A) in a liquid phase comprising a first solvent, which solvent is miscible with water and has a lower boiling point than water; II) in the event that isocyanate functional polymers or isocyanate functional prepolymers were provided in step I): adding NCO-reactive compounds such that, at least in part, a reaction with the polymers or prepolymers occurs; III) distilling off the first solvent, which is miscible with water, such than an aqueous polyurethane dispersion is obtained; wherein the liquid phase in step I) still comprises water and/or after step II), water is added to the mixture obtained according to step II). Foam bubbles created during step III) are contacted at least temporarily by a second solvent. The first and second solvents are preferably acetone.

Abstract: The invention relates to a method for producing a polyurethane dispersion, having the steps of: I) providing isocyanate-functional prepolymers A) in a liquid phase comprising a solvent which can be mixed with water and which has a lower boiling point than water and II) adding NCO-reactive compounds to the isocyanate-functional prepolymers from step I) such that a reaction with the prepolymers is at least partly produced; wherein the liquid phase in step I) additionally comprises water and/or after step II), water is added to the mixture obtained in step II). A pressure p1 is applied to the liquid mixture with the isocyanate-functional prepolymers A) prior to and/or while carrying out step II), wherein p1 is less than the local atmospheric pressure present at said point in time. The pressure p1 is selected such that in step II), ?50 mass. % (preferably >0 mass. % to ?mass. %, more preferably ?0.1 mass. % to ?30 mass. % in particular ?1 mass. % to ?10 mass.

Abstract: The invention relates to a method for producing a cosmetic composition, comprising at least one polyurethane urea which does not contain any ionically hydrophilizing groups and is dissolved in a solvent or solvent mixture, wherein the solvent consists of one or more monohydroxy-functional alcohol(s), or a solvent mixture that consists of organic solvents and contains ?50 wt. %, relative to the total weight of the solvent mixture, of at least one monohydroxy-functional alcohol. The invention also relates to a cosmetic composition obtainable according to the method of the invention as well as to a method for forming a cosmetic coating on skin, nails and/or keratin fibers using the cosmetic compositions of the invention. The invention further relates to a sunscreen composition containing a polyurethane urea as well as to said sunscreen composition for protecting skin and/or hair from negative effects of sun rays.

Abstract: The invention relates to a cosmetic composition for hair, containing at least one compound containing at least three carbodiimide groups built according to formula (I), R4—[R1—N?C?N]n—R5 (I), where n is a whole number between 3 and 100, and R1, R4 and R5 each stand, independently of one another, for linear or branched, aliphatic or cycloaliphatic, optionally substituted groups with 1 to 100 C-atoms. The invention also relates to uses of the cosmetic composition for hair, and to a method and the application thereof.

Abstract: The present invention relates to aqueous, curable composition, comprising or consisting of A) at least one uretdione prepolymer, which comprises at least one uretdione group, and which is obtainable by reacting A1) at least one uretdione polyisocyanate having an isocyanate functionality of at least 2.0, whereby said uretdione polyisocyanate is obtained from at least one aliphatic polyisocyanate, with A2) at least one compound comprising at least one Zerewitinoff-active group, and A3) at least one reactant, which comprises at least one Zerewitinoff-active group and being different from A2 or which is H2O, preferably in the presence of at least one catalyst, to obtain the uretdione prepolymer, wherein the prepolymer has an acid number of at most 4 mg KOH/g, preferably determined according to DIN EN ISO 2114:2002-06 as 37 wt. % aqueous dispersion; and B) optionally at least one compound, which comprises at least one Zerewitinoff-active group; and C) at least one azolate-compound.

Abstract: The invention provides a process for producing polyurethane foams, in which compositions comprising A) isocyanate-functional prepolymers obtainable by the reaction of A1) low molecular weight diisocyanates of molar mass from 140 to 278 g/mol with A2) polyalkylene oxides having an OH functionality of two or more, A3) optionally further isocyanate-reactive components not covered by A2), B) water in an amount of at least 2% by weight, based on the total weight of the composition; C) optionally heterocyclic 4-membered or 6-membered ring oligomers of low molecular weight diisocyanates having a molar mass of 140 to 278 g/mol; D) optionally catalysts; E) optionally salts of weak acids, the corresponding free acids of which have a pKA in water at 25° C. of ?3.0 and ?14.

Abstract: The present invention relates to a viscoelastic element comprising a polyurethane foam, wherein the polyurethane foam can be obtained by reacting at least one isocyanate-functional prepolymer (VI) in the presence of a special polyurethane urea dispersion (V2), wherein the reaction of the prepolymer (VI) takes place in the presence of the polyurethane urea (V2) with a medium containing isocyanate-reactive groups. The invention also relates to a method for producing the viscoelastic element and to the use thereof.

Abstract: The invention relates to a contact adhesive product, comprising a substrate and a polyurethane resin, which can be obtained by reacting at least A) an aliphatic polyisocyanate component having an average isocyanate functionality of ?1.8 and ?2.

Abstract: The invention relates to aqueous uretdione group-containing compositions comprising or consisting of (A) at least one uretdione group-containing curing agent based on aliphatic, cycloaliphatic, araliphatic, and/or aromatic polyisocyanates which do not contain chemically bonded hydrophilating groups; (B) at least one hydroxy group-containing polyol which contains at least one chemically bonded carboxylic acid group; (C) optionally solvents; and (D) optionally auxiliary agents and additives; wherein the quantity ratio of the components (A) and (B) is measured such that the molar ratio of the NCO groups of the curing agent (A), said groups being provided in the form of uretdione, to the NCO reactive groups of the polyol (B) equals 3.0:0.5 to 0.5:3.0, and A and B are provided as a physical mixture.

Abstract: The present invention relates to a catalyst system comprising: A) at least one compound selected from azoles, oxazoles, thiazoles, benzotriazole, benzimidazole, benzoxazole and salts thereof; B) at least one acid catcher, which contains at least one epoxy group; and C) at least one catalyst containing an N,N,N?-trisubstituted amidine structure with an amidine group content of from 12.0 to 47.0 wt %, calculated as CN2 with molecular weight=40. The invention also relates to a kit which comprises the catalyst system of the present invention and an aqueous uretdione dispersion having an acid number of from 1 to 100 KOH/g and additionally at least one carboxyl group. The invention further relates to a method for producing a polyurethane layer using the catalyst system of the present invention and said uretdione dispersion, and to the obtained polyurethane layer, and to the use of the catalyst system for curing aqueous acidic uretdione dispersions and/or for the production of paints or coatings.