Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2006-08-08
2006-08-08
Robertson, Jeffrey B. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S159000, C525S162000, C525S406000, C525S443000, C525S456000, C525S510000, C528S249000, C528S254000, C528S258000, C528S261000, C528S265000
Reexamination Certificate
active
07087683
ABSTRACT:
A crosslinking agent that is an ungelled reaction product of (a) an aminoplast resin and (b) a compound having active hydrogen groups reactive with the aminoplast resin such that the crosslinking agent is essentially free of functional groups reactive with an aminoplast resin and has a glass transition temperature of at least 10° C. is disclosed. Compound (b) is, more specifically, a monofunctional sulfonamide having only one active hydrogen. 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 compositions and substrates coated therewith are also disclosed. Methods for modifying aminoplasts are also disclosed.
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Ambrose Ronald R.
Chasser Anthony M.
Hu Shengkui
Retsch William H.
Meyers Diane R.
PPG Industries Ohio Inc.
Robertson Jeffrey B.
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