✦ LIBER ✦

5559198 Process for preparing poly(vinyl trifluoroacetate) and poly(vinyltrifluoroacetate/vin yl ester) copolymers in supercritical CO2 : Eian Gilbert L; Elsbernd Cheryl L S Mahtomedi, MN, United States assigned to Minnesota Mining and Manufacturing Company

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 115 KB
Volume: 5
Category: Article
ISSN: 0959-6526
DOI: 10.1016/s0959-6526(97)82430-4

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✦ Synopsis

Previously used poly(ethylene terephthalate) polyester materials and copolymers thereof, and in particular postconsumer polyester materials, are depolymerized and repolymerized to produce bottle grade polymer containing up to 75% of the previously used material. The process involves the solubilization and depolymerization of the previously used polyester material in a transesterification and/or polymerization mixture containing dimethylterephthalate, ethylene glycol and transesterification products thereof.