| 摘要 |
<p>1325254 Microcapsules BAYER AG 19 April 1971 [4 March 1970] 22709/71 Heading B8C Microcapsules are prepared by dispersing a solid or liquid core material, which is waterinsoluble or water-immiscible, in an aqueous solution of a thermoreversible coacervating copolymer of 70-30 mol per cent acrylic acid and 30-20 mol per cent acrylamide at above the coacervate transition temperature and cooling the resultant dispersion to below that temperature so that a coacervate forms and encapsulates the particles. Thereafter the capsules may be removed and further treated, e.g. hardened, by conventional methods or such treatment may be carried out before separation. Such treatments include the addition of: a water soluble non- solvent for the polymer e.g. MeOH, EtOH, PrOH or acetone, a cross-linking agent, e.g. an aldehyde such as HCHO or glutarodialdehyde, or salts of polyvalent metal ions e.g. CrIII, Ni, Bi, Cu or Ce.</p> |
