Quadratic acid bisamides and salts thereof having the formula I are effective stabilizers of synthetic resins, especially for imparting resistance to deterioration resulting from exposure to light ##STR1## wherein R.sub.1 is H, C.sub.1-12 alkyl or OH-substituted C.sub.2-12 alkyl; R.sub.2 is --(CH.sub.2).sub.m --O--.sub.n, wherein m is an integer of 2-6; n is 0 or 1; R.sub.3 is H, CH.sub.3, CH.sub.2 --CH.sub.2 --OH, CH.sub.2 --COOH or CH.sub.2 --CH.sub.2 --COOH; HX is an acid equivalent of an unsubstituted or substituted monobasic, dibasic or polybasic organic acid of not more than 20 carbon atoms, or of sulfuric or phosphoric acid; and 0.ltoreq.p.ltoreq.2.
式子I表示为二元酸双酰胺及其盐,对于合成
树脂的稳定剂具有有效作用,特别是对于由于暴露于光线下而导致的耐久性恶化的防护。其中,R1是H,C1-12烷基或OH取代的C2-12烷基; R2是-(
CH2)m-O-n,其中m是2-6的整数; n是0或1; R3是H,
CH3, - -OH, -COOH或 - -COOH; HX是未取代或取代的单基、二基或多基有机酸的酸当量,碳原子数不超过20,或
硫酸或
磷酸; 0≤p≤2。