초록 ▼

The present invention relates to non-ionic, water-dispersible polyurethanes having a substantially linear molecular structure and lateral polyalkylene oxide polyether chains containing ethylene oxide units characterized in that from about 40 to 95% of the alkylene oxide units of the lateral polyalky

The present invention relates to non-ionic, water-dispersible polyurethanes having a substantially linear molecular structure and lateral polyalkylene oxide polyether chains containing ethylene oxide units characterized in that from about 40 to 95% of the alkylene oxide units of the lateral polyalkylene oxide polyether chains consist of ethylene oxide units and from about 5 to 60% consist of propylene oxide, butylene oxide or styrene oxide, to aqueous dispersions of these non-ionic, water-dispersible polyurethanes and to processes for producing these non-ionic, water-dispersible polyurethanes.

대표청구항 ▼

Non-ionic, water-dispersible polyurethanes produced using an isocyanate group to isocyanate-reactive group equivalent ratio of from about 0.8:1 to 2.5:1 having a substantially linear molecular structure and about 3 to 30% by weight, based on the weight of the polyurethane, of lateral polyalkylene ox

Non-ionic, water-dispersible polyurethanes produced using an isocyanate group to isocyanate-reactive group equivalent ratio of from about 0.8:1 to 2.5:1 having a substantially linear molecular structure and about 3 to 30% by weight, based on the weight of the polyurethane, of lateral polyalkylene oxide polyether chains containing ethylene oxide units which are responsible for dispersibility, wherein from about 40 to 95% of the alkylene oxide units of the lateral polyalkylene oxide polyether chains, based on the number of alkylene oxide units, consist of ethylene oxide units and from about 5 to 60% are selected from the group consisting of propylene oxide, butylene oxide and styrene oxide units. A process for producing water-dispersible polyurethanes having a substantially linear molecular structure and about 3 to 30% by weight, based on weight of the polyurethane, of lateral polyalkylene oxide polyether chains by reacting organic diisocyanates with difunctional organic compounds (“difunctional”in the context of the isocyanate polyaddition reaction) containing terminal isocyanate-reactive hydrogen atoms and having a molecular weight of from about 300 to 6000 in the presence of synthesis components containing hydrophilic groups which guarantee the dispersibility of the polyurethanes and optionally in the presence of chain extenders having a molecular weight below about 300 known in polyurethane chemistry and optionally in the presence of the aids and additives commonly used in polyurethane chemistry, wherein the synthesis components containing hydrophilic groups are diols corresponding to the following general formula: [Figure] and/or diisocyanates corresponding to the following general formula: [Figure] wherein R－represents a difunctional radical of the type obtained by removing the isocyanate groups from a diisocyanate having a molecular weight of from about 112 to 1000, R′－represents a hydrogen atom or a monofunctional hydro-carbon radical having from 1 to 8 carbon atoms, X－represents a difunctional radical obtained by removing the terminal oxygen atom from a polyalkylene oxide radical having from about 5 to 90 alkylene oxide units, of which, based on the number thereof, from about 40 to 95% consist of ethylene oxide units and from about 5 to 60% are selected from the group consisting of propylene oxide, butylene oxide and styrene oxide units, Y－represents oxygen or －NR″′－, R″and R″′which may be the same or different, each represent monofunctional hydrocarbon radicals having from 1 to 12 carbon atoms, and Z－represents a radical which has the same definition as Y and wherein the equivalent ratio of isocyanate groups to isocyanate-reactive groups is from about 0.8:1 to 2.5:1.