C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/133
C08G 18/80 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/65 (2006.01) C08J 3/12 (2006.01)
Patent
CA 1064642
Application of: GUENTHER KURT HOESCHELE CASE 33 LC-1800 Title: HEAT-ACTIVATABLE, STORAGE-STABLE POLYURETHANE POWDERS Abstract of the Disclosure A heat-activatable polyurethane powder is prepared which contains about stoichiometric amounts of both blocked -NCO groups and active hydrogen-containing groups, the dis- tribution of which is determined by the order in which the reactants are brought together. Typically an emulsified polymeric glycol (which may be admixed with more or less low molecular weight diol) reacts with a limited excess of diiso- cyanate to produce a dispersion of beads of -NCO-terminated polyurethane prepolymer; these in turn are reacted first with enough phenol or other monofunctional blocking agent to tie up about half of the free -NCO groups and secondly with one mole of a diamine or other difunctional active hydrogen com- pound per equivalent of the other half of the -NCO groups. When the resulting powder is coated upon a substrate and heated, the blocked -NCO groups are regenerated and there upon they react with the active hydrogens available, resulting in the formation of a high molecular weight polyurethane film. - 1 -
242238
E.i. Du Pont de Nemours And Company
Na
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