| 摘要 |
PCT No. PCT/EP94/00318 Sec. 371 Date Dec. 20, 1995 Sec. 102(e) Date Dec. 20, 1995 PCT Filed Feb. 3, 1994 PCT Pub. No. WO94/18259 PCT Pub. Date Aug. 18, 1994Disclosed herein is a process wherein glycerol, glycidol or 2,2-dimethyl-1,3-dioxolane-4-methanol is polymerized in the presence of an acid zeolite having an average pore size of at least 0.6 nanometer at 150 DEG -250 DEG C. At least 50 wt. % of cyclic polymers are obtained. |
