Example 14
The elemental composition of the Succinic acid-1,4-Butanediol-Malic acid copolyester was analyzed by Proton Induced X-ray Emission (PIXE) at Elemental Analysis Inc. This method provides quantitative elemental composition of a material for inorganic elements sodium through uranium on the periodic table. The elements found are shown in Table 7. The polymer did not contain detectable heavy metals such as Tin, which is sometimes used in the manufacture of resorbable polymers such as poly-glycolide, polylactide and poly-glycolide-co-lactide. The following trace elements were detected: silicon 18.98 ppm, titanium 14.77 ppm, and zinc 5.967 ppm.
