Process for the solvent-free, continuous preparation of polyureas
First Claim
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1. A crosslinked, solid polyurea which melts only above 240°
- C. by decomposition and is insoluble in solvents, obtained by a process comprising forming a reaction product by reacting, in the absence of a solvent, as reactant (A), (1) an isocyanurate of isophorone diisocyanate (IPDI), (2) a mixture of IPDI and IPDI-isocyanurate, (3) an isocyanurate of hexamethylene diisocyanate (HDI), (4) a mixture of HDI and HDI-isocyanurate, or (5) a mixture of IPDI-isocyanurate and HDI-isocyanurate, with, as reactant (B), isophoronediamine (IPD), wherein (A) and (B) are the only reactants, such that the reaction is carried out with a NCO/NH2 ratio of 1;
1, in an extruder, intensive kneader, intensive mixer or static mixer, for a residence time of from 3 seconds to 15 minutes and at a reaction temperature of 50 to 250°
C., and then cooling said reaction product, whereby said polyurea is formed.
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Abstract
The invention relates to a process for the solvent-free, continuous preparation of polyureas by reacting at least one isocyanate and/or isocyanurate having at least two NCO groups with at least one diamine and/or polyamine in an extruder, intensive kneader, intensive mixer or static mixer by thorough mixing and rapid reaction by briefly heating and subsequent cooling to isolate the end product.
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1 Claim
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1. A crosslinked, solid polyurea which melts only above 240°
- C. by decomposition and is insoluble in solvents, obtained by a process comprising forming a reaction product by reacting, in the absence of a solvent, as reactant (A), (1) an isocyanurate of isophorone diisocyanate (IPDI), (2) a mixture of IPDI and IPDI-isocyanurate, (3) an isocyanurate of hexamethylene diisocyanate (HDI), (4) a mixture of HDI and HDI-isocyanurate, or (5) a mixture of IPDI-isocyanurate and HDI-isocyanurate, with, as reactant (B), isophoronediamine (IPD), wherein (A) and (B) are the only reactants, such that the reaction is carried out with a NCO/NH2 ratio of 1;
1, in an extruder, intensive kneader, intensive mixer or static mixer, for a residence time of from 3 seconds to 15 minutes and at a reaction temperature of 50 to 250°
C., and then cooling said reaction product, whereby said polyurea is formed.
- C. by decomposition and is insoluble in solvents, obtained by a process comprising forming a reaction product by reacting, in the absence of a solvent, as reactant (A), (1) an isocyanurate of isophorone diisocyanate (IPDI), (2) a mixture of IPDI and IPDI-isocyanurate, (3) an isocyanurate of hexamethylene diisocyanate (HDI), (4) a mixture of HDI and HDI-isocyanurate, or (5) a mixture of IPDI-isocyanurate and HDI-isocyanurate, with, as reactant (B), isophoronediamine (IPD), wherein (A) and (B) are the only reactants, such that the reaction is carried out with a NCO/NH2 ratio of 1;
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Current AssigneeDegussa AG (Rag-Stiftung)
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Original AssigneeDegussa AG (Rag-Stiftung)
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InventorsWeiss, Joern Volker, Weihrauch, Thomas, Herda, Silvia, Grenda, Werner, Behrendt, Klaus
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Primary Examiner(s)SERGENT, RABON A
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Application NumberUS10/306,215Publication NumberTime in Patent Office1,432 DaysField of Search528/68, 528/73, 528/67US Class Current528/68CPC Class CodesC08G 18/0895 Manufacture of polymers by ...C08G 18/3234 cycloaliphaticC08G 18/755 and at least one isocyanate...C08G 18/792 formed by oligomerisation o...
