Patent ID: 8841479
Filing Date: 2014-09-23
Classification: C08G

Abstract:
1. A low-monomer-content 1:1 monoadduct, having a free diisocyanate content of less than 5% by weight, obtained by a process comprising reacting, as starting compounds, A) at least one selected from the group consisting of an aliphatic diisocyanate, a cycloaliphatic diisocyanate, and an araliphatic diisocyanate, in an amount of 1-20 mol, and B) 1 mol of at least one reactive olefinic compound having an OH group, in an apparatus, to obtain a reaction product and unreacted diisocyanate, wherein the unreacted diisocyanate is separated off by short-path distillation from the reaction product, wherein the short-path distillation takes place in the presence C) of at least one inhibitor comprising a hydroxyl, thiol, or amine group that is not directly bonded to an aromatic group and is reactive toward an NCO group, wherein an amount of the at least one inhibitor is between 0.1%-3% by weight, based on a weight of a sum of one mole of diisocyanate A) and one mole of a reactive olefinic compound B) corresponding to an NCO/OH of 2:1, wherein the at least one inhibitor is added before, during, or after the reacting of A) with B), and the at least one inhibitor is at least one selected from the group consisting of 1. present in free form, 2. attached to the component A), and 3. attached to the reaction product of A) with B), wherein the monoadduct comprises the at least one inhibitor, and wherein, during the short-path distillation or the entire process, at least one inhibitor gas is passed through the apparatus.