| 摘要 |
A water-soluble, rigid backbone oligomer is claimed which has a mol.wt. less than 10,000 and comprises recurring units coupled by carbonyl linking moieties, the oligomer having anionic gps. and predominantly linear geometry such that regular spacing between anionic gps. exists in an aqs. medium. The oligomer may be (A) a polyurea of formula (I) R-(NH-CO)m-(NH-X-NH-CO)n-NH-R3. (R = H, 1-4C alkyl, phenyl or phenyl substd. with 1-2 R' gps. and up to 3 substits. selected from Cl, Br or 1-4C alkyl; R1 = SO3R2, CO2R2, PO3(R2)2 or OPO3R2; R2 = H or a cation; m = 0 or 1, provided that when m = 0 R = H; X = a gp. (i)-(xii) where Y = CO2, -C-C-; -N=N-, -CO-NH-, -N(O)=N- or -CR=N-N=CR-; n = 3-50; R3 = R or XNH2. (B) a polycarbonate of formula (II) X1-O-(CO-O-X-O)-nX2 (II) (X1 = HO-X, 1-4C alkyl, phenyl, phenyl substd. with 1-2 R1 and up to 3 substits. selected from Cl, Br and 1-4C alkyl; X2 = H or CO2X1). (C) a polyester of formula (III) R4O-(CO-X3-CO-O-X-O)-nR5 (III) (R4 = as for R2 or X1; R5 = R41O-CO-X3-CO-; R41 = as for R4 or R2; X3 = a gp. of formula (viii) or (xiii)-(xxii), or (D) a polyamide of formula (IV) R6-(CO-X3-CO-NH-X-NH)n-R7 (IV). (where R6 = H2N-X-NH, R2O, RNH or R-CO-NH-X-NH-; R7 = H, R2O-CO-X3-CO-, R-CO- or RNH-CO-X3-CO-).
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