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50 grams of 2,2-diethoxytetrahydrofuran and 28.1 grams of 1,4-butane diol previously mixed with 0.05 grams of polyphosphoric acid, were reacted for 3.25 hours over an increasing temperature span of 70° to 130° C., and under atmospheric pressure according to Example 45. Then the reactants were heated under reduced pressure of 120 mm to 2.4 mm Hg for 4 hours at 110° to 125° C. to yield 1,6,8-trioxa-spiro(4,6)undecane. The spiro compound was polymerized in a sealed tube at 125° C. in the presence of a Lewis acid catalyst, i.e. SbF5, PF5 or BF3, to yield the polymer, where n is 10 to 1000. ##STR50##

1. customwere reacted for 3.25 hours over an increasing temperature span of 70° to 130° C.
2. temperatureThen the reactants were heated under reduced pressure of 120 mm to 2.4 mm Hg for 4 hours at 110° to 125° C.