Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2005-01-25
2005-01-25
Wu, David W. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S151000, C524S121000, C524S349000, C524S147000, C524S585000
Reexamination Certificate
active
06846859
ABSTRACT:
The present invention includes a polyolefin composition having reduced coloration with aging. The polyolefin composition comprises at least one polyolefin, an effective amount of a primary phenolic antioxidant to promote long term thermal stability of the polymer composition, and an effective amount of a phosphite processing stabilizer to promote thermal stability of the polymer composition during melt processing. The polymer composition further comprises an effective amount of a sacrificial phosphite antioxidant to reduce the yellowness index of the polymer composition. The sacrificial phosphite antioxidant and the phosphite processing stabilizer are not the same compound.
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Coffy Tim J.
Gray Steven D.
Guenther Gerhard K.
Fina Technology, Inc.
Lee Rip A.
Madan Mossman & Sriram P.C.
Wu David W.
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