Uretdione diisocyanates and a process for their production

Details Uretdione diisocyanates and a process for their production Uretdione diisocyanates and a process for their production

1997-01-23

1998-05-12

Sergent, Rabon

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

2521822, 25218221, 528 67, 528 73, 540202, 548951, 548952, 560336, 560352, C08G 1879, C08G 1880, C07D22900

Patent

active

057506299

ABSTRACT:
The present invention relates to a process for preparing pure bis(isocyanatoalkyl)monouretdiones corresponding to formula (I) ##STR1## wherein R represents identical or different, linear or branched alkyl groups having 4 to 9 carbon atoms,
by oligomerizing at least a portion of the isocyanate groups of aliphatic diisocyanates in the presence of catalysts which accelerate the dimerization of isocyanate groups, terminating the reaction at the desired degree of oligomerization, removing unreacted excess diisocyanate by extraction or thin film distillation to obtain a distillation residue, subjecting the distillation residue to thin film distillation at a temperature of 160.degree. to 220.degree. C. and a pressure of 0.01 to 1.0 mbar and obtaining bis(isocyanato-alkyl)monouretdiones corresponding to formula (I) as the distillate. The present invention also relates to the resulting bis(isocyanato-alkyl)monouretdiones corresponding to formula I and to their use for the production of polyisocyanate addition products, in particular as the isocyanate components in polyurethane coatings compositions, in which the isocyanate groups may optionally be present in blocked form.

REFERENCES:
patent: 4463154 (1984-07-01), Disteldorf et al.
patent: 4476054 (1984-10-01), Disteldorf et al.
patent: 4595534 (1986-06-01), Scholl
patent: 4614785 (1986-09-01), Richter et al.
patent: 4668780 (1987-05-01), Disteldorf et al.
patent: 4912210 (1990-03-01), Distelford et al.
patent: 4929724 (1990-05-01), Engbert et al.
patent: 5043092 (1991-08-01), Pedain et al.
patent: 5143994 (1992-09-01), Laas et al.
patent: 5149766 (1992-09-01), Bruchmann
patent: 5216107 (1993-06-01), Pedain et al.
patent: 5237058 (1993-08-01), Laas et al.
patent: 5596066 (1997-01-01), Laas et al.
patent: 5621064 (1997-04-01), Laas et al.
J. Prakt, Chem. 336 1994, 185-200.
P. Muller et al, Anew. Makromol. Chem. 65 1977, 23-39.
F. Schmitt, XIXth Fatipac Kongress, vol. III, Aachen 1988, pp. 211ff.

Affiliated with

Also associated with

Rating

Uretdione diisocyanates and a process for their production does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Uretdione diisocyanates and a process for their production, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Uretdione diisocyanates and a process for their production will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-979863