Aminoplast crosslinkers derived from tall oil rosin powder...

Details Aminoplast crosslinkers derived from tall oil rosin powder... Aminoplast crosslinkers derived from tall oil rosin powder...

2005-04-12

2005-04-12

Seidleck, James J. (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From natural resin or derivative reactant excluding tall oil...

C528S158500, C524S594000

Reexamination Certificate

active

06878791

ABSTRACT:
A crosslinking agent that is an ungelled reaction product of (a) at least one aminoplast resin and (b) at least one tall oil rosin wherein the crosslinking agent is essentially free of active hydrogen functional groups and has a glass transition temperature of at least 10° C. is disclosed. Methods for preparing crosslinking agents are also disclosed. Further provided is a curable powder coating composition including a polymer having a glass transition temperature of at least 30° C. containing reactive functional groups and the present crosslinking agent; a multilayer composite coating composition and substrates coated therewith are also disclosed.

REFERENCES:
patent: 3644245 (1972-02-01), Flanagan et al.
patent: 3851761 (1974-12-01), Schwarcz
patent: 4337193 (1982-06-01), Szita
patent: 4990339 (1991-02-01), Scholl et al.
patent: 5143961 (1992-09-01), Scholl et al.

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