5Wagner Kuno, Klinkmann Kurt. A process for the prepara- tion of polyisOeyanateshaving a biuret strueture[ P]. GB : 1318557. 1973 - 05 - 31.
6Windemuth Erwin, Wagner Kuno, Bunge Wilhelm. Organ- ic polyisocyanates [ P ]. GB : 1030305,1966 - 05 - 18.
7Wagner Kuno, Rocgler Manfred, etal. Process for the prep- aration of polyisocyanates containing biurct groups [ P ]. US :3862973,1975 - 01 - 28.
8Hennig Hans J, Cologne stammheim. Process for preparing biuret polyisocyanates[ P]. US :3350438,1967 - 10 - 31.
9Mohring Edgar, Wagner Kuno, Muller Hanns Peter. Process for the preparation of polyisocyanates contai- ning biuret roups[ P]. GB: 1561610,1980 - 02 - 27.
10Bruchmann Bemd, Wolf Stefan, Heider Wolf- gang, etal. Preparation of biuret - containing polyisocyanate [ P ]. US :7022874,2006 - 04 - 04.
9KUNO W. Verfahren zur Herstellung von Polyisocyanaten mit Biuret - Struktur: DE, 1101394[P]. 1961 -03 -09.
10LESIAK T,CZERWINSKI W, BALEWSKI A. Chemistry and application of organic isocyanates IV. Conversion of hexamethyiene diisocyanate into biuret derivatives by means of NaESO4·10H2O [J]. Die Angew. Makrom. Chem. ,1980,88(1) :179-191.