| 摘要 |
PCT No. PCT/GB93/00272 Sec. 371 Date Jul. 1, 1994 Sec. 102(e) Date Jul. 1, 1994 PCT Filed Feb. 10, 1993 PCT Pub. No. WO93/16675 PCT Pub. Date Sep. 2, 1993.A poly(vinyl phosphonic acid)/glass cement is improved by pre-reacting the acid with ZnF2 and BPO4, and by mixing BPO4 with the glass powder.
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