| 摘要 |
NEW MATERIAL:A compound expressed by formula I (R1-R4 represent H or methyl; R5-R7 represent H, 1-20C alkyl or 6-20C aryl; Y represents 1-20C divalent ester residue; l, m and n are 0-60, provided that at least one of l, m and n is not 0). EXAMPLE:A compound expressed by formula II. USE:A resin-forming reagent for producing a hydrogel having good shape-stability, mechanical strength and water content, which gives the hydrogel with superior transparency, optical property and material permeability. PREPARATION:A compound expressed by formula III is reacted with tetrachlorosilane and the reaction product is reacted with alcohols expressed by formula IV (R8 represents H or methyl; R9 represents H, 1-20C alkyl or 6-20C aryl; p is 0-60).
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