摘要:
A process for producing aqueous primary dispersions of polymer-ensheathed pigment, which comprises (a) at least one polyfunctional isocyanate and (b) at least one compound having isocyanate-reactive groups selected from polyetherols, polyesterols, polyhydric alcohols having up to 8 carbon atoms, polycarbonate diols, polyhydroxyolefins, polyhydroxyurethanes, polyisobutenediols, polysiloxanes having on average at least 2 hydroxyl groups per molecule and lactone-based polyesterdiols being mixed with pigment, water and if appropriate one or more surface-active substances and reacted with each other.
摘要:
Aqueous dispersion of a polyurethane, obtainable by reacting polyisocyanates and isocyanate-reactive compounds in miniemulsion, wherein the isocyanate-reactive compounds are at least in part polysiloxanes of the formula I where R1 and R2 independently of one another are a monovalent hydrocarbon radical having not more than 20 carbon atoms, which if appropriate may also contain heteroatoms such as O or N, R3 and R4 independently of one another are a single bond or a divalent hydrocarbon radical having not more than 20 carbon atoms, which if appropriate may also contain heteroatoms such as O or N, R5 and R6 independently of one another are a group OH, SH, NH2 or NHR7 and R7 is a monovalent hydrocarbon radical having not more than 20 carbon atoms, which if appropriate may also contain heteroatoms such as O or N, and n is an integer from 1 to 100.
摘要:
An aqueous dispersion of a block copolymer comprising a polyadduct or polycondensate (polymer I for short) on one hand and a polymer obtainable by free-radical addition polymerization (polymer II for short) on the other, wherein polymer I is obtainable by reaction of its starting compounds in miniemulsion, one of the starting compounds of polymer I is an initiator of free-radical addition polymerization, and polymer II is prepared in the presence of said initiator.
摘要:
An aqueous dispersion of a block copolymer comprising a polyadduct or polycondensate (polymer I for short) on one hand and a polymer obtainable by free-radical addition polymerization (polymer II for short) on the other, wherein polymer I is obtainable by reaction of its starting compounds in miniemulsion, one of the starting compounds of polymer I is an initiator of free-radical addition polymerization, and polymer II is prepared in the presence of said initiator.
摘要:
A process for preparing aqueous primary dispersions comprising at least one hydrophobic polyurethane obtainable in miniemulsion by reacting (a) at least one polyisocyanate and (b) at least one compound containing at least one isocyanate-reactive group in the presence of a catalyst.
摘要:
The invention relates to aqueous primary dispersions which contain a hydrophobic polyurethane which is produced in a mini-emulsion by reacting with (a) polyisocyanate and (b) compounds containing isocyanate reactive groups. The invention also relates to a method for producing said dispersion and the use thereof for producing coatings and adhesives.
摘要:
Hybrid dispersions comprising polyadducts and free-radical addition polymers, obtainable by first emulsifying the constituent monomers of said polyadducts and polymers in water and then conducting the polyaddition to prepare the polyadducts and the free-radical addition polymerization to prepare the polymers, the respective monomers being emulsified in water before 40% of the monomers of which the polyadducts are composed have reacted to form such polyadducts.
摘要:
Platinum(II) complexes and the use of these complexes for oxidation of methane to methyl sulfate are disclosed, the catalyst having, as ligands, a network based on aromatic N-heterocycles which has at least 2 coordinative nitrogen atoms per platinum atom, and the complex anion is selected from a halide, hydrogensulfate, hydrogensulfite, sulfate, sulfite, methylsulfate, methanol, water, hydroxide, carbon monoxide, hydrogencarbonate and carbonate. The catalyst enables a selective low-temperature oxidation of methane to methyl sulfate or methanol. The catalysts not only exhibit high activity, but can also be removed easily from the reaction mixture and reused over several runs without significant loss of activity.
摘要:
The present invention relates to a process based on phase separation for the production of porous carbon monoliths, to the monoliths produced in accordance with the invention, and to the use thereof.