摘要:
The present invention provides a process for the preparation of polyols based on fatty acid esters and starter compounds having Zerewitinoff-active hydrogen atoms and the use thereof for the preparation of polyurethane materials.
摘要:
The present invention relates to is coupling process for the preparation of polyether polyols starting from highly functional starter compounds that are solid or highly viscous under reaction conditions and monofunctional starter compounds that are liquid under reaction conditions with Zerewitinoff-active hydrogen atoms.
摘要:
The invention relates to a polymer composition containing 5 to 95% by weight of a copolymer H and 2 to 60% by weight of a copolymer K, the copolymers H and K each having polyether macromonomer structural units and acid monomer structural units, which are present in the copolymers H and K in each case in a molar ratio of 1:20 to 1:1, and at least 20 mol % of all structural units of the copolymer H and at least 25 mol % of all structural units of the copolymer K being present in each case in the form of acid monomer structural units, the polyether macromonomer structural units of the copolymer H having side chains containing in each case at least 5 ether oxygen atoms, the number of ether oxygen atoms per side chain of the polyether macromonomer structural units of the copolymer H varying in such a way that the corresponding frequency distribution diagram, in which the number of ether oxygen atoms per side chain of a polyether macromonomer structural unit is plotted along the abscissa and the associated frequency for the copolymer H is plotted along the ordinate, contains at least 2 maxima.
摘要:
The invention relates to combinations of sulfonylurea herbicides (A) and their salts in which R2 is H, OH, aliphatic hydrocarbon radical or hydrocarbon-oxy radical, and R1 is an acyl radical, and the other symbols are as defined in claim 1, and safeners of type (B1) and (B2) in which the symbols are as defined in claim 1.
摘要:
The invention relates to a polymer composition containing 3 to 95% by weight of a copolymer H and 3 to 95% by weight of a copolymer K, the copolymers H and K each having polyether macromonomer structural units and acid monomer structural units, which are present in the copolymers H and K in each case in a molar ratio of 1:20 to 1:1, and at least 20 mol % of all structural units of the copolymer H and at least 25 mol % of all structural units of the copolymer K being present in each case in the form of acid monomer structural units, the polyether macromonomer structural units of the copolymers H and K having side chains containing in each case at least 5 ether oxygen atoms, the number of ether oxygen atoms per side chain of the polyether macromonomer structural units of the copolymers H and K varying in each case in such a way that the corresponding frequency distribution diagrams, in which the number of ether oxygen atoms per side chain of a polyether macromonomer structural unit is plotted in each case along the abscissae and the respectively associated frequencies for the copolymers H or K are plotted in each case along the ordinates, contain in each case at least 2 maxima whose abscissa values differ in each case by more than 7 ether oxygen atoms from one another, the frequency distribution diagrams of the copolymers H and K differing from one another in that the abscissa value of at least one maximum of the copolymer H differs in each case by more than 5 ether oxygen atoms from the abscissa values of all maxima of the copolymer K and/or that the arithmetic means of the ether oxygen atoms of the polyether macromonomer structural units of the copolymers H and K differ from one another by more than 5 ether oxygen atoms.
摘要:
The invention relates to methods for the preparation of polyether polyols by DMC-catalysed alkylene oxide addition to starter compounds comprising acidic sulfuric acid salts, to the use thereof for the preparation of polyurethanes, and to polyurethanes comprising the polyether polyols according to the invention.
摘要:
The present invention relates to a process for the preparation of polyether carbonate polyols with primary hydroxyl end groups, comprising the steps of reaction of a starter compound containing active hydrogen atoms with an epoxide and carbon dioxide under double metal cyanide catalysis, reaction of the product obtained with a cyclic carboxylic acid anhydride and reaction of this product obtained with ethylene oxide in the presence of a catalyst which contains at least one nitrogen atom per molecule, excluding non-cyclic tertiary amines with identical substituents. The invention furthermore relates to polyether carbonate polyols obtainable by this process, compositions comprising these polyether carbonate polyols and polyurethane polymers based on these polyether carbonate polyols.
摘要:
The invention relates to a copolymer which is suitable as a superplasticizer for hydraulic binders and comprises 5 to 55 mol % of an isoprenol polyether derivative structural unit, 2 to 90 mol % of an acrylic acid derivative structural unit and 2 to 90 mol % of a hydroxyalkyl acrylate structural unit.
摘要:
The present invention relates to a hydrogel on the basis of polyurethane or polyurethane urea, said hydrogel comprising hydrolysable functional groups in the polymer chain, to a method for producing the hydrogel and to the use of the hydrogel as adhesion barriers.
摘要:
The invention concerns a process for the preparation of a hardening accelerator composition by reaction of a water-soluble calcium compound with a water-soluble silicate compound and by reaction of a calcium compound with a silicon dioxide containing component under alkaline conditions, in both cases the reaction being carried out in the presence of a polycondensate containing at least one structural unit consisting of an aromatic or heteroaromatic moiety bearing a polyether side chain and at least one structural unit consisting of an aromatic or heteroaromatic moiety bearing at least one phosphoric acid ester group and/or its salt. The invention concerns a composition of calcium silicate hydrate and the polycondensate, its use as hardening accelerator and for the reduction of the permeability of hardened compositions.