Polyisocyanates containing uretidione and allophanate groups, a

Details Polyisocyanates containing uretidione and allophanate groups, a Polyisocyanates containing uretidione and allophanate groups, a

1994-09-23

1995-10-24

Seidleck, James J.

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, 540202, 528 44, 528 45, 528 73, C08G 1802

Patent

active

054611350

ABSTRACT:
Disclosed herein is a liquid, monoallophanate-containing, monouretidione-containing polyisocyanate composition characterized by having (i) an isocyanate functionality of between 2.8 and 6.5, (ii) a free NCO content of 10% to 47% by weight, (iii) a viscosity of less than 1000 cp (25.degree. C.), and (iv) the presence of monouretidione and monoallophanate groups in a molar ratio of said monouretidione groups to said monoallophanate groups of between about 20:1 and about 1:5. Also disclosed is a process for producing the above compositions, as well as their use, optionally in blocked form in one or two component coating compositions.

REFERENCES:
patent: 5237058 (1993-08-01), Laas et al.

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