(Cyclo)condensation of isocyanate compounds

Details (Cyclo)condensation of isocyanate compounds (Cyclo)condensation of isocyanate compounds

2005-08-30

2005-08-30

Gorr, Rachel (Department: 1711)

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...

C528S049000, C528S053000, C540S202000, C502S167000

Reexamination Certificate

active

06936677

ABSTRACT:
The invention concerns the use of a compound comprising a nitrogenous heterocyclic group with five cyclic members including, at least two nitrogen atoms, one of the nitrogen atoms bearing a hydrogen atom to promote the opening/closing reaction of uretidione cycles in the presence of a nucleophile compound provided that, when the nitrogenous heterocyclic group is imidazole, the opening/closing reaction is not the closing reaction of the uretidione cycle in the presence of a quaternary ammonium salt.

REFERENCES:
patent: 3252945 (1966-05-01), Ugi et al.
patent: 4697014 (1987-09-01), Robin
patent: 5484916 (1996-01-01), Bruchmann et al.
patent: 6635761 (2003-10-01), Revelant et al.
patent: WO 99/23128 (1999-05-01), None

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