Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2007-03-20
2007-03-20
Nutter, Nathan M. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S296000, C528S298000, C528S300000, C528S301000, C528S302000, C528S307000, C528S308000, C528S308600, C525S437000, C525S444000, C525S450000, C524S401000, C428S034900, C428S037000, C428S036400, C428S036500, C428S221000, C428S480000, C428S482000, C428S364000
Reexamination Certificate
active
10888046
ABSTRACT:
The present invention provides certain sulfonated copolyetherester compositions containing hydroxyalkanoic acids and processes for producing such sulfonated aromatic copolyetheresters. The invention further provides shaped articles, preferably in the shape of films, coatings and laminates, having improved thermal properties, wherein the shaped articles are produced from the certain sulfonated copolyetherester compositions. Some of these materials are also biocompostable. The sulfonated copolyetheresters are produced from a mixture of an aromatic dicarboxylic acid component, hydroxyalkanoic acid component, a sulfonate component, a poly(alkylene ether) glycol component, a glycol component, an optional other glycol component, an optional branching agent, and an optional color reducing agent.
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Dalickas Gail A.
E. I. du Pont de Nemours and Company
Nutter Nathan M.
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