有機ビルダー (第11報)
マロン酸型エーテルカルボン酸のビルダー効果について
1981 年 30 巻 1 号 p. 31-37
詳細
1981 年 30 巻 1 号 p. 31-37
Some of the malonate-type ether polycarboxylates including trisodium 2-oxa-1, 1, 3-propanetricarboxylate (CMT) and trisodium 2-oxa-1, 3, 4-butane-tricarboxylate (CMOS) were prepared from the corresponding alcohols and ethyl diazomalonate, then their building performances were compared with those of the acetate-type ether polycarboxylates, sodium tripolyphosphate (STPP) and disodium 3-oxapentanedioate (ODA).
The detergency building action of the aqueous solutions of binary systems consisting of those ether polycarboxylate builders were also discussed. The detergency were tested on naturally soiled cotton patches and the detergency powers were evaluated by Scheff e's method in a detergent system formulating sodium alkylbenzenesulf ovate (LAS).
From the results summarized in Fig.-1, it was evident that malonate-type ether polycarboxylates showed the building performances much superior to those of the corresponding acetate-type ether polycarboxylates. Above all malonate-type ether carboxylate with methyl group on the carbon neighboring dicarboxymethoxyl group, i.e., tetrasodium 3-methyl-2, 5-dioxa-1, 1, 6, 6-hexane tetracarboxylate (MEGDM) showed a building performance superior to that of STPP. From Fig.-2, it was found that some mixtures of these acids exhibited synergistic effects on their building performances.
