Abstract:
The invention relates to a foamed polyurethane which is obtainable by mixing a) polyisocyanates, b) high-molecular compounds carrying groups that are reactive to isocyanate groups, c) solid particles, d) propellants, e) optionally chain extenders, cross-linking agents or mixtures thereof, f) optionally a catalyst and g) optionally other additives, to give a reaction mixture and allowing said mixture to react, the percentage of chain extenders being less than 6% by weight, based on the overall weight of components a) to f), the solid particle content being more than 15% by weight, based on the overall weight of components a) to f), and the average functionality of the high-molecular compounds carrying groups that are reactive to isocyanate groups being less than 2.5. The invention further relates to a molded body which contains a foamed polyurethane of the invention, to a method for producing the foamed polyurethane and to the use of a molded body according to the invention as a shoe sole.
Abstract:
The invention relates to a dispersion containing (i) at least one liquid polymer and (ii) at least one polymer particle mixture comprising at least one meltable solid substance and at least one copolymer (C). Said at least one copolymer (C) is a copolymer consisting of at least one a,ß-ethylenically unsaturated monomer and at least one polymerisable polymer from the class of liquid polymers in (i). The invention also relates to a method for the production of said dispersion, to the use of said dispersion for producing polyurethanes, and to a method for producing polyurethanes, according to which at least one dispersion of said type is reacted with at least one polyisocyanate.
Abstract:
The invention relates to polyurethane foams containing particles and characterised in that the particles are predominantly embedded in the cell walls.
Abstract:
The invention relates to a device for impregnating fibers (1) with a matrix material, comprising a unit for saturating the fibers with the matrix material, a unit for setting the fiber volume fraction (100) being included, which comprises at least one opening (107), through which the saturated fibers (1) are guided, each opening (107) being dimensioned at the minimum opening cross-section (111) of the opening in such a way that such an amount of matrix material is removed that the desired fiber volume fraction is achieved, and the unit for setting the fiber volume fraction (100) comprising an upper part (101, 131) and a lower part (103, 133) and each opening (107) being formed partly in the lower part (103, 133) and partly in the upper part (101, 131). The invention further relates to a method for impregnating fibers in such a device.
Abstract:
The invention relates to a method for producing a polyurethane fiber composite material, wherein (a) di- and/or polyisocyanate, (b) compounds with hydrogen atoms which are reactive towards isocyanate groups, (c) compounds containing at least one carbon-carbon double bond, (d) optionally a catalyst which accelerates the urethane reaction, (e) optionally radical starters, and (f) optionally additional auxiliary agents and additives are mixed in order to form a reaction mixture with which a fiber material is wetted and cured. The compounds with hydrogen atoms which are reactive towards isocyanate on average have at least 1.5 hydrogen groups which are reactive towards isocyanate per molecule; the double bond density of the compound (c) is at least 21%; the double bond functionality of the compound (c) is greater than 1; the compound (c) does not have groups which are reactive towards isocyanate; and the equivalent ratio of isocyanate groups of the di- and/or polyisocyanates (a) and the hydrogen atoms which are reactive towards isocyanate of the compound (b) is 0.8 to 2. The invention additionally relates to a polyurethane fiber composite material which can be obtained using the method according to the invention and to the use of the polyurethane fiber composite material as structural components.
Abstract:
La materia de la invención es un método para producir poliuretanos mediante reacción de a) poliisocianatos con b) compuestos que tienen por lo menos dos átomos de hidrógeno reactivos con grupos isocianato, caracterizado porque el compuesto b) contiene por lo menos un poliol que contiene llenador b1) y por lo menos un agente tixotrópico bii).