Aqueous polyurethane compositions

Details Aqueous polyurethane compositions Aqueous polyurethane compositions

2011-04-05

2011-04-05

Cameron, Erma (Department: 1715)

Coating processes

With post-treatment of coating or coating material

Heating or drying

Reexamination Certificate

active

07919146

ABSTRACT:
An aqueous polyurethane composition comprising a polyurethane which is the reaction product of: (A) an isocyanate-terminated prepolymer and (B) at least one active-hydrogen chain-extending compound comprising at least 0.20 stoichiometric equivalents with respect to the isocyanate content of the isocyanate-terminated prepolymer (A), of an active-hydrogen chain-extending compound selected from the group consisting of hydrazine, hydrazine derivatives and mixtures thereof; and wherein at least 0.2 stoichiometric equivalents of the anionic or potentially anionic water-dispersing groups are neutralised with ammonia.

REFERENCES:
patent: 6362273 (2002-03-01), Martin et al.
patent: 2002/0028875 (2002-03-01), Anderle
patent: 2005/0182188 (2005-08-01), Rische et al.
patent: 2006/0111538 (2006-05-01), Coogan et al.
patent: 0 646 609 (1995-04-01), None
patent: 7-268055 (1995-10-01), None
International Search Report mailed Jun. 7, 2006 in PCT/EP2006/002454.
Written Opinion mailed Jun. 7, 2006 in PCT/EP2006/002454.

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