Process for the preparation of polyurethanes containing...

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

C - Chemistry, Metallurgy

08

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C08G 18/22 (2006.01) C08G 18/16 (2006.01) C08G 18/32 (2006.01) C08G 18/65 (2006.01) C08G 18/70 (2006.01) C08G 18/79 (2006.01)

Patent

CA 1290889

PROCESS FOR THE PREPARATION OF POLYURETHANES CONTAINING URETDIONE RINGS ABSTRACT OF THE DISCLOSURE 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 polyuethanes are formed in relatively short reaction times and possess outstanding mechanical properties.

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