Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2006-03-10
2009-06-02
Eashoo, Mark (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S589000
Reexamination Certificate
active
07541397
ABSTRACT:
A uretonimine-modified isocyanate composition having reduced color and a method of forming the same is disclosed. The method of forming the uretonimine-modified isocyanate composition comprises providing a polyisocyanate composition having two or more isocyanate groups and reacting the polyisocyanate composition at a temperature in a range of from about 80° C. to about 130° C. and in the presence of a catalyst. The reaction of the polyisocyanate composition is quenched with a quenching agent and a color inhibitor having a low basicity and having at least one hindered amine group is added. The uretonimine-modified isocyanate composition has a color value corresponding to an a* value of greater than about −10 and a b* value less than about 10 as defined by CIE L*a*b* (CIELAB) Color Space Specification and undergoes a % NCO group decrease of less than about 6 %.
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Bananto Sandra
Savino Thomas
BASF Corporation
Borrego Fernando A.
Eashoo Mark
Frank Noah
Howard & Howard Attorneys PLLC
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