| 摘要 |
PCT No. PCT/GB91/01858 Sec. 371 Date Apr. 26, 1993 Sec. 102(e) Date Apr. 26, 1993 PCT Filed Oct. 23, 1991 PCT Pub. No. WO92/07843 PCT Pub. Date May 14, 1992.Benzofuran-ether-sulphone monomers of formula <IMAGE> and ether ketone polymers derived therefrom of formula <IMAGE>
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