Process for the preparation of polyurethanes containing uretdion

Details Process for the preparation of polyurethanes containing uretdion Process for the preparation of polyurethanes containing uretdion

1987-11-13

1988-11-22

Anderson, Harold D.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521160, 521161, 528 55, 528 67, 528 73, C08J 900, C08G 1800, C08G 1814, C08G 1808

Patent

active

047866551

ABSTRACT:
Polyurethanes containing uretdione rings are produced by reacting a polyisocyanate containing a uretdione ring with a relatively high molecular weight dihydroxyl compound in the presence of a bismuth salt of an organic carboxylic acid and a low molecular weight aromatic diamine. The low molecular weight aromatic diamine is used in a quantity which is 5 to 10 times the quantity of bismuth salt used. These solid polyurethanes are formed in relatively short reaction times and possess outstanding mechanical properties.

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patent: 4667008 (1987-05-01), Grogler et al.
patent: 4742090 (1988-05-01), Hunter et al.
Hofmann, Berichte 3 (1870), pp. 765-766.

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