Producing isocyanate-terminated, urethane group-containing prepolymers
AssigneeCovestro Deutschland AG
InventorsChristoph Malbertz, Stefan Hirschfeld, Dieter Mager, Oswald Wilmes
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Abstract
The invention relates to a method for producing isocyanate-terminated, urethane group-containing prepolymers, comprising reacting a reaction mixture that contains a stoichiometric excess of at least one aliphatic and/or cycloaliphatic diisocyanate and a polyol composition having an OH number >400, characterized in that the reaction mixture is mixed with a specific power input of 0.5 kW/m3 to 40 kW/m3, relative to the total volume of the reaction mixture.
Claims16
A process for producing isocyanate-terminated, urethane group-containing prepolymers, comprising reacting a reaction mixture containing a stoichiometric excess of at least one aliphatic and/or cycloaliphatic diisocyanate and a polyol composition having an OH number >400, where the reaction mixture is mixed with a specific power input in the range from 0.5 kW/m3 to 40 kW/m3, based on the total volume of the reaction mixture, wherein the reaction is carried out in a batch size from 1000 kg to 100 000 kg per batch, where the batch size relates to the total mass of the feedstocks in the reaction mixture.
A polyisocyanate containing isocyanurate and allophanate groups and having an average isocyanate functionality ≥4 and a turbidity, measured by means of nephelometry in accordance with DIN EN ISO 7027-1:2016-11, of at most 2.0 NTU, where the polyisocyanate has a residual monomer content in accordance with DIN EN ISO 10283:2007-11 of ≤0.50% by weight.
Dependencies are inferred from the claim text.