Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Reexamination Certificate
2006-05-23
2006-05-23
Acquah, Samuel A. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C528S275000, C528S277000, C528S279000, C528S280000, C528S281000, C528S283000, C528S285000, C528S308600, C524S777000, C524S780000, C524S783000, C524S785000
Reexamination Certificate
active
07049390
ABSTRACT:
A melt polymerization process for the preparation of poly(1,3-propylene-co-isosorbide) terephthalate (3GIT), new 3GITs and products made from the 3GITs. The process comprises (a) providing a mixture comprising terephthalic acid or its alkyl ester, 1,3-propanediol and isosorbide in a molar ratio of diols to terephthalic acid or its alkyl ester of from about 1.1:1 to about 1.6:1 and a molar ratio of 1,3-propanediol to isosorbide of from about 2:1 to about 10:1; (b) reacting the mixture in an inert atmosphere at a temperature of about 180 to about 245° C., with concurrent removal of a distillate comprising at least 80% of the water or alkanol volatile reaction product, wherein the distillate contains less than about 5 weight % 1,3-propanediol and less than 1 weight % isosorbide; and (c) continuing the reaction in the presence of a polycondensation catalyst at a pressure of about 0.25 to about 2 mm Hg and about 245 to about 260° C. to form a 3GIT containing about 4 to about 20 mole % isosorbide units, based on the 3GIT.
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Adelman Douglas J.
Greene Robin N.
Putzig Donald E.
Acquah Samuel A.
Dalickas Gail A.
E. I.du Pont de Nemours and Company
Kuller Mark D.
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