Preparation was made of the following oligomers : poly (sodium vinyloxyacetate) PVOA, poly [(sodium acrylate) -co- (sodium vinyloxyacetate)] P (A-VOA), poly [(sodium acrylate) -co- (sodium allyloxyacetate)] P (A-AOA), poly [(sodium acrylate) -co- (disodium allyloxymalonate)] P (A-AOM), poly [(sodium vinyloxyacetate) -co- (disodium maleate)] P (VOA-Ma), poly [(sodium allyloxyacetate) -co- (disodium maleate)] P (AOA-Ma), poly [(disodium allyloxymalonate) -co- (disodium maleate)] P (AOM-Ma), poly [(sodium N-allylaminoacetate) -co- (disodium maleate)] P (AG-Ma) and poly [(sodium
N-allyl-3-aminopropionate) -co- (disodium maleate)] P (AAP-Ma).
Their sequestration capacity toward Ca (II), Cu (II), Cd (II), Ag (I) and Hg (II), the dispersion capacity toward MnO
2 and all their biodegradabilities were determined and compared in these respects with sodium tripolyphosphate (STPP), disodium 3-oxapentanedioate (ODA), poly (sodium acrylate) PA, poly (sodium methacrylate) PMA and poly (disodium fumarate) PF. Their building performance in detergents was also examined.
The polycarboxylate oligomers, except the amino acid type oligomers P (AG-Ma), and P (AA-Ma), showed better sequestration capacity. PF and P (AOM-Ma) showed excellent sequestration capacity. This capacity toward Ca (II) ions was superior to that toward either EDTA or NTA. Sequestration capacity was apparently better when the carboxylate content in the oligomers was large. PVOA, regarded as a carboxymethylation product of polyvinyl alcohol, tended to undergo biodegradation under aerobic conditions. Copolymerization with vinyloxyacetate (VOA) caused their biodegradability to occur more easily than that of the corresponding homopolymers. The oligomers tested in this report showed better detergency building performance than that of ODA, and some were superior to STPP in this respect.
抄録全体を表示