| 摘要 |
1531343 Polyvalent metal complexes NATIONAL STARCH & CHEMICAL CORP 19 Feb 1976 [7 March 1975] 06691/76 Headings C3A C3P and C3U Ionic complexes are formed between (A) a water-soluble anionic polyelectrolyte and (B) a polyvalent metal cation of valency at least 3 and which is present in amount 0À01-5À0 milliequivalents per gram of polyelectrolyte. The complexes are solid, water-swellable, waterinsoluble materials, have a film swell index of at least 15 in synthetic urine, are capable of absorbing at least 15 times their own weight of body fluid and of retaining it under deforming pressure, and are capable of un-complexing at elevated pH and re-complexing at lower pH. In examples, polyelectrolytes selected from polyacrylic acid, polymethacrylic acid, acrylic acid / acrylamide copolymer, 2 - acrylamide- 2-methylpropane sulphonic acid / acrylamide copolymer, methyl vinyl ether/maleic anhydride copolymer (all the foregoing being used in partly neutralized form), un-neutralised polyacrylic acid, starch sodium sulphate, sodium carboxymethyl starch, sodium carboxymethyl cellulose and a polysaccharide derived from kelp; are complexed with a metal compound selected from acetates of Al, Cr and Zn, acetylacetonates of Al, Fe and Ti, aluminium sulphate, aluminium chloride or ferric chloride. |
