Process for the trimerization of diisocyanates
First Claim
1. In a process for trimerization of diisocyanates in the presence of a catalyst comprising quaternary ammonium salts of organic acids having the formula:
- ##STR10## wherein X represents the same or different radicals selected from the group consisting of C1 -C20 alkyl, C3 -C8 cycloalkyl, and C2 -C20 aralkyl;
two X radicals taken together with at least one other heteroatom forming a hetero-ring and three X radicals taken together with the quarternary nitrogen atoms forming a heteroring through a common heteroatom such that said heterocyclic ring structure is selected from the group consisting of triethylene diamine, methyl triethylene diamine, quinuclidine, N-methylmorpholine, N-ethylmorpholine and N,N'"'"'-dimethylpiperazine;
R is alkyl, cycloalkyl or aralkyl, R" is R or hydrogen;
R+R" together form a C1 -C12 alkyl radical;
R'"'"' is hydrogen, hydroxyl or a C1 -C12 alkyl radical optionally containing a CH.sub.(3-b) Zb group, wherein b=1 to 3 and Z is OH, the improvement comprising;
reacting said diisocyanate with said catalyst in an amount of 0.02-0.1% by weight calculated on the weight of the compound to be trimerized at a temperature ranging from 40°
-120°
C.
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Accused Products
Abstract
In a process for the trimerization of diisocyanates in the presence of a catalyst comprising quaternary ammonium salts of organic acids having the formula: ##STR1## wherein X represents the same or different radicals selected from the group consisting of C1 -C20 alkyl, C3 -C8 cycloalkyl, and C2 -C20 aralkyl; two X radicals taken together with at least one other heteroatom forming a hetero-ring and three X radicals taken together with the quaternary nitrogen atoms forming a hetero-ring through a common hetero-atom such that said heterocyclic ring structure is selected from the group consisting of triethylene diamine, methyl triethylene diamine, quinuclidine, N-methylmorpholine, N-ethylmorpholine, and N,N'"'"'-dimethylpiperazine; R is alkyl, cycloalkyl or aralkyl, R" is R or hydrogen; R+R" together form a C1 -C12 alkyl radical; R'"'"' is hydrogen, hydroxyl or a C1 -C12 alkyl radical, optionally containing a CH.sub.(3-b) Zb group, wherein b=1 to 3 and Z is OH, the improvement comprising: reacting said diisocyanate with said catalyst in an amount of 0.02 to 0.1% by weight calculated on the weight of the compound to be trimerized at a temperature ranging from 40° to 120° C.
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Citations
9 Claims
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1. In a process for trimerization of diisocyanates in the presence of a catalyst comprising quaternary ammonium salts of organic acids having the formula:
- ##STR10## wherein X represents the same or different radicals selected from the group consisting of C1 -C20 alkyl, C3 -C8 cycloalkyl, and C2 -C20 aralkyl;
two X radicals taken together with at least one other heteroatom forming a hetero-ring and three X radicals taken together with the quarternary nitrogen atoms forming a heteroring through a common heteroatom such that said heterocyclic ring structure is selected from the group consisting of triethylene diamine, methyl triethylene diamine, quinuclidine, N-methylmorpholine, N-ethylmorpholine and N,N'"'"'-dimethylpiperazine;
R is alkyl, cycloalkyl or aralkyl, R" is R or hydrogen;
R+R" together form a C1 -C12 alkyl radical;
R'"'"' is hydrogen, hydroxyl or a C1 -C12 alkyl radical optionally containing a CH.sub.(3-b) Zb group, wherein b=1 to 3 and Z is OH, the improvement comprising;reacting said diisocyanate with said catalyst in an amount of 0.02-0.1% by weight calculated on the weight of the compound to be trimerized at a temperature ranging from 40°
-120°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- ##STR10## wherein X represents the same or different radicals selected from the group consisting of C1 -C20 alkyl, C3 -C8 cycloalkyl, and C2 -C20 aralkyl;
Specification
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- Resources
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Current AssigneeDegussa-Huels Aktiengesellschaft (Rag-Stiftung)
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Original AssigneeChemische Werke Huls Aktiengesellschaft
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InventorsDisteldorf, Josef, Hubel, Werner, Wolf, Elmar
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Primary Examiner(s)Ford, John M.
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Application NumberUS06/400,992Time in Patent Office690 DaysField of Search544/193US Class Current544/193CPC Class CodesC07D 251/34 Cyanuric or isocyanuric estersC08G 18/022 the polymeric products cont...C08G 18/1875 containing ammonium salts o...C08G 18/73 acyclicC08G 18/755 and at least one isocyanate...C08G 18/757 containing at least two iso...C08G 18/758 containing two or more cycl...C08G 18/791 containing isocyanurate groups
