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
2006-04-18
2009-12-01
Gulakowski, Randy (Department: 1796)
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...
C528S056000, C502S242000
Reexamination Certificate
active
07625992
ABSTRACT:
Processes for polyurethane polymerization are provided. The processes use polysilyl derivatives of germanium and tin as catalysts. Polyurethanes made using the catalysts have increased gel times as compared to polyurethanes made using conventional processes.
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E. I. Du Pont de Nemours and Company
Gulakowski Randy
Leonard Michael
Tanzer Gail D.
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