| US 7,541,407 B2 | ||
| Process for adding methine UV light absorbers to PET prepared by direct esterification | ||
| Perry Michael Murdaugh, Sr., Lexington, S.C. (US); Earl Edmondson Howell, Jr., Kingsport, Tenn. (US); Cory Lee Wells, Gray, Tenn. (US); Max Allen Weaver, Kingsport, Tenn. (US); and Jason Clay Pearson, Kingsport, Tenn. (US) | ||
| Assigned to Eastman Chemical Company, Kingsport, Tenn. (US) | ||
| Filed on May 27, 2004, as Appl. No. 10/855,722. | ||
| Prior Publication US 2005/0277758 A1, Dec. 15, 2005 | ||
| Int. Cl. C08K 5/06 (2006.01) | ||
| U.S. Cl. 524—755 [528/272] | 26 Claims |
| 1. A method for incorporating a UV light absorbing compound into a polyester prepared using direct esterification of reactants
comprising a dicarboxylic acid and a diol, said method comprising:
a. combining said reactants in an esterifying reactor under conditions sufficient to form an esterified product comprising
at least one of: an ester, an oligomer, a low molecular weight polyester and mixtures thereof;
b. polymerizing the esterified product in a polycondensation reactor to form a polyester; and
c. adding at least one UV absorbing compound to at least one of said esterification reactor or polycondensation reactor when
at least 50% of the carboxy groups initially present in the reactants have been esterified, wherein said UV absorbing compound
includes at least one 4-oxybenzylidene radical of Formula I:
 wherein X is hydrogen or up to two moieties selected from the group consisting of hydroxy, C1-C6 alkyl, C1-C6 alkoxy and halogen, and wherein the UV absorbing compound includes a polyester reactive group.
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