Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
190 words
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 C 1 -C 20 alkyl, C 3 -C 8 cycloalkyl, and C 2 -C 20 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 C 1 -C 12 alkyl radical; R' is hydrogen, hydroxyl or a C 1 -C 12 alkyl radical optionally containing a CH.sub.(3-b) Z b 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.
Claim 2
Dependent Claim
190 words
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 C 1 -C 20 alkyl, C 3 -C 8 cycloalkyl, and C 2 -C 20 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 C 1 -C 12 alkyl radical; R' is hydrogen, hydroxyl or a C 1 -C 12 alkyl radical optionally containing a CH.sub.(3-b) Z b 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.
Claim 3
Dependent Claim
22 words
The process according to claim 1, wherein said trimerization reaction is conducted at a temperature in the range of 60° C.-90° C.
Claim 4
Dependent Claim
20 words
A process according to claim 1, characterized in that the trimerization is carried out up to a conversion of 45%.
Claim 5
Dependent Claim
30 words
A process according to claim 1 or 2, characterized in that the trimerization is carried out continuously in a coolable tube-shaped reactor with simultaneous addition of monomeric isocyanate containing catalyst.
Claim 6
Dependent Claim
23 words
A process according to claims 1 or 3, characterized in that the unconverted monomeric isocyanate is removed by means of a thin-film distillation.
Claim 7
Dependent Claim
15 words
A process according to claims 1 or 3, characterized in that aromatic diisocyanates are trimerized.
Claim 8
Dependent Claim
15 words
A process according to claims 1 or 3, characterized in that aliphatic diisocyanates are trimerized.
Claim 9
Dependent Claim
15 words
A process according to claims 1 or 3, characterized in that cycloaliphatic diisocyanates are trimerized.
Claim 10
Dependent Claim
15 words
A process according to claim 8, characterized in that the cycloaliphatic diisocyanate is isophorone diisocyanate.