Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2005-12-27
2005-12-27
Acquah, Samuel A. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S308600, C528S491000, C528S493000, C528S497000, C528S501000, C526S067000, C526S068000, C526S069000, C526S070000, C526S206000, C526S208000, C524S732000, C524S768000, C524S770000
Reexamination Certificate
active
06979720
ABSTRACT:
Enzymes which are capable of catalyzing esterifications and/or transesterifications such as selected lipases and esterases can, under specified conditions, convert certain lower linear oligomers of polyesters to their cyclic ester oligomers in quantities greater than would be predicted by thermodynamic calculation or prior art methods. The cyclic ester oligomers are useful for the production of higher molecular weight linear polyesters.
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Brugel Edward G.
Di Cosimo Robert
Acquah Samuel A.
E. I. du Pont de Nemours and Company
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