Abstract:
The invention relates to a method for producing rigid polyurethane foam materials by reacting polyisocyanates with compounds containing at least two hydrogen atoms that are reactive with isocyanate groups in the presence of foaming agents.
Abstract:
The invention relates to a method for producing nanoscale metal oxide-filled polymers. Said method is characterized by the following steps: a) producing a nanosuspension of one or more crystalline metal oxides, metal hydroxides or metal oxide hydroxides by heating a suspension of one or more compounds containing the corresponding metals in a first polymerizable compound to a temperature higher than the boiling point of water at process temperature and lower than the boiling temperature of the first polymerizable compound and also lower than the temperature at which polymerization of the first polymerizable compound begins, in the presence of water in an amount corresponding to 1 to 10 oxygen atoms per metal atom of the compound or of the compounds containing the corresponding metals, and b) polymerization of the first polymerizable compound under the conditions of temperature and pressure conventional for the first polymerizable compound.
Abstract:
The invention relates to a method for producing viscoelastic polyurethane flexible foam materials by converting a) polyisocyanates with b) compounds having at least two hydrogen atoms reactive with isocyanate groups, and c) blowing agents, characterized in that the compounds having at least two hydrogen atoms reactive with isocyanate groups b) comprise b1) 0 to 90 parts by weight of at least one polyether alcohol made of exclusively propylene oxide units or propylene oxide units and a maximum of 50% by weight, relative to the total amount of alkylene oxide ethylene oxide units used in the polyether chain, having a nominal functionality of 3-8 and a hydroxyl number in the range of 100 to 350 mg KOH/g, and b2) 10 to 100 parts by weight of at least one graft polyol that can be produced by in situ polymerization of olefinically unsaturated monomers in at least one polyether alcohol comprising exclusively propylene oxide units or propylene oxide units and a maximum of 50% by weight, relative to the total amount of the alkylene oxide ethylene oxide units in the polyether chain, having a nominal functionality of 2-8 and a hydroxyl number in the range of 100 to 350 mg KOH/g, having a solids content of a maximum of 60% by weight, relative to the total amount of the polyols and solids used, the sum of the parts by weight b1) and b2) being 100.
Abstract:
Dispersions comprising functionalized metal oxide particles, polymerizable compounds and optionally a solvent, and the use thereof for stabilizing polymers.
Abstract:
The invention relates to a polyurea which can be produced from a) a component A comprising a1) 5 to 40% by weight of at least one polyetheramine 1 (PEA 1), which can be obtained from at least one polyether polyol 1 (PEP 1) and at least one amine 1, the PEP 1 having a weight equivalent of = 500, a2) 30 to 90% by weight of at least one polyetheramine 2 (PEA 2), which can be obtained from at least one polyether polyol (PEP 2) and at least one amine 2, the PEP 2 having a weight equivalent of > 500, a3) 5 to 30% by weight of at least one amine chain extender and b) one component B which is a prepolymer and can be obtained from b1) at least one polyether polyol (PEP 3) and b2) at least one isocyanate.
Abstract:
The present invention relates to processes for producing polyurethanes by mixing a) polyisocyanate, b) a mixture obtainable by introducing a salt of an alkali metal or of an alkaline earth metal into a compound containing urethane groups, c) one or more compounds containing epoxy groups and optionally d) polyol, e) chain extenders and f) fillers and other additives to give a reaction mixture and allowing this to react to give the polyurethane, where the content of alkal metal ions or of alkaline earth metal ions per equivalent of urethane groups in the compound b) is from 0.0001 to 3.5. The present invention also relates to a polyurethane obtainable by a process of this type and to the use of a polyurethane of this type for producing bodywork components for vehicles.