Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2008-03-11
2008-03-11
Sergent, Rabon (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S401000, C524S404000, C524S408000, C524S414000, C524S418000, C524S419000, C524S701000, C524S706000, C524S779000, C524S787000, C524S839000, C524S840000, C528S059000, C528S061000, C528S071000
Reexamination Certificate
active
10715916
ABSTRACT:
Aqueous polyurethane dispersions comprising polyurethane polymer and methods for making and using same are disclosed herein. In one aspect of the present invention, aqueous polyurethane dispersions, comprising a polyurethane polymer having a weight average molecular weight ranging from 20,000 to 80,000, are prepared by controlling the weight average molecular weight of the polymer by reacting the isocyanate terminated prepolymer with at least one chain terminating agent; and/or maintaining a N/COOH molar ratio of amine in the neutralizing agent to acid functional group in the isocyanate reactive compound to from about 0.5:1 to about 1:1.
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Fazel Shafiq Nisarali
Klingenberg Eric Howard
Air Products and Chemicals Inc.
Rossi Joseph D.
Sergent Rabon
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