Abstract: Carboxyl-terminated and low-molecular weight polyamide(CLMPA)was synthesized from polycondensation reaction among oleic dimeric acid(ODA), polymerized rosin(PR)and 1,2-ethylenediamine(EDA). Polyhydroxy polyamide(PHPA)was obtained by ring-opening polymerization among adipic acid(AA), epoxy-51(E-51)and CLMPA. Polycaoboxylic polyamide(PCPA)was synthesized by esterification of PHPA with methyltetrahydrophthalic anhydride(Me-THPA), and anionic water-soluble polyamide resin(AWPA)was obtained by means of salt-formation from neutralization. The effects of PR/ODA,CLMPA/AA on the properties of the water-soluble polyamide such as water solubility,water resistance,relative molecular mass(M_r), viscosity and glass transition temperature(T_g)were investigated. The structures of the intermediates and the target product were characterized by FT-IR and ¹H NMR. The results showed that the optimum molar ratios were as followed: molar ratio of PR to ODA was 4:6, molar ratio of CLMPA to AA was 2:10, the polyamide resin was water soluble, with M_r 7264, water absorption 27.6%, viscosity 42.3 Pa·s(100℃) and T_g 47.15℃.

Key words: water-based inks, polyamide resin, polymerized rosin