| 摘要 |
1364691 Anion exchange resins containing amine oxide groups BAYER AG 6 Aug 1971 [8 Aug 1970 9 Oct 1970] 37112/71 Heading C3P Anion exchange resin matrices have attached to them, amine oxide groups. The exchangers may be prepared by treating an anion exchange resin containing tertiary amino groups with an oxidizing agent such as H 2 O 2 , or an organic or inorganic peracid such as peracetic, perbenzoic and persulphuric acids, which oxidizes the tertiary amine groups to amine oxide groups. The final exchange resins may contain quarternary ammonium groups in addition to the amine oxide groups. Such groups may already be present (in which case they are not affected by the oxidation), or can be introduced by alkylating tertiary amino groups left by incomplete oxidation. If such groups are present, they should be in the minority. In the examples the following ion exchangers are oxidized by hydrogen peroxide: (1), (2), (6) and (7) a styrene/ divinyl benzene matrix which has been amino methylated, and then methylated with HCHO/ HCOOH; (3) as in (2) but in which the polymer is also quarternized with methyl chloride; (4) a chloromethylated, aminated (with diethylamine) styrene/d.v.b. matrix; and (5) a macroporous methyl acrylate/dv.b./trivinylcyclohexane copolymer, aminated with N,N-dimethyl- 1,3-propylene diamine. The final anion exchanger of example (7) also contained quarternary ammonium groups which had been introduced after incomplte oxidation of the t-amino groups. |
