24968-12-5 51635-90-6 51848-46-5 51931-15-8 52231-97-7 52232-31-2 52232-99-2 52705-10-9 54650-84-9 54650-85-0 57284-97-6 58967-80-9 60617-28-9 61912-84-3 64814-97-7 66369-03-7 74239-00-2 74239-01-3 74239-02-4 74239-03-5 74239-04-6 83381-95-7 9078-57-3 9087-65-4 97380-75-1 Poly(oxy-1,4-butanediyloxycarbonyl-1,4-phenylenecarbonyl) Polytetramethylene terephthalate