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...
Reexamination Certificate
2005-02-01
2005-02-01
Gorr, Rachel (Department: 1711)
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...
C252S182200, C525S127000, C525S111000, C525S454000, C525S440030
Reexamination Certificate
active
06849705
ABSTRACT:
A polyaddition compound having uretdione and carboxyl groups, and having a melting range of between 40 and 200° C., a free NCO group content of from 0 to 5% by weight and an NCO functionality of at least 1.5, and a number-average molar mass of between 1000 and 10,000, may be prepared by reacting at least one polyisocyanate containing uretdione groups, at least one hydroxycarboxylic or mercaptocarboxylic acid, and one or more of at least one monofunctional compound having a functional group which is reactive toward an isocyanate, at least one aliphatic and/or cycloaliphatic polyol, at least one polyol having functional groups, and at least one aliphatic and/or cycloaliphatic polyamine. Polyurethane plastics, especially polyurethane powder coating materials may be prepared from the polyaddition compound of the present invention.
REFERENCES:
patent: 4801623 (1989-01-01), Hess et al.
patent: 0 443 138 (1991-08-01), None
patent: 0 566 953 (1993-10-01), None
patent: 0 874 010 (1998-10-01), None
Degussa - AG
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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