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
2010-11-23
Wu, David (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S425000, C525S437000, C525S439000, C525S444000, C525S448000, C528S302000, C528S307000, C528S308100, C528S308200, C528S308300
Reexamination Certificate
active
07838596
ABSTRACT:
A process for preparing modified polymer by withdrawing a slip stream of polymer melt from the discharge line of a continuous polymerization reactor, admixing in a highly modified polymeric additive into the polymer melt within the slip stream, then introducing the modifier containing slip stream late in the manufacturing process prior to the slip stream withdrawal point. The improved processes of the invention have particular utility for large-scale, continuous reactor where transitions and short production runs are economically prohibitive thereby limiting the product breath. The process is particularly suited for producing a family of copolyesters using a continuous melt phase production process.
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Colhoun Frederick Leslie
DeBruin Bruce Roger
Venett Kenrick Lyle
Eastman Chemical Company
Graves, Jr. Bernard J.
Jones, Jr. Robert
Knight Jennifer R.
Wu David
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