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1.发明授权Minute capsules having walls of siliceous material-hydroxy-containing material complex and process for their manufacture 失效具有含硅材料 - 含羟基材料复合物的分散型胶囊及其制造方法
公开(公告)号：US3791987A
公开(公告)日：1974-02-12
申请号：US3791987D
申请日：1972-02-03
Applicant: NCR
Inventor： FANGER G
CPC classification number: B01J13/10 , Y10T428/2984 , Y10T428/2989
Abstract: A PROCESS IS DISCLOSED FOR MANUFACTURING MINUTE CAPSULES, EN MASSE, WHEREIN THE CAPSULE WALLS COMPRISE A HARDENED SILICATE MATERIAL. THE PROCESS INCLUDES LIQUIDLIQUID PHASE SEPARATION OF THE WALL MATERIAL SILICATE FROM SOLUTION AS SILICIC ACID IN AN AQUEOUS CAPSUL MANUFACTURING VEHICLE BY MEANS OF A GLYCOL PHASE-SEPARATION-INDUCING MATERIAL. PREFERRED STARTING MATERIALS FOR THE PRESENT PROCESS INCLUDE ALKALI-METAL WATER GLASS AND POLYETHYLENE GLYCOL, THE PRESENT LIQUID-LIQUID PHASE SEPARATION CAN BE CONSIDERED TO BE SIMILAR TO SO-CALLED "COMPLEX COACERVATION" OF THE PRIOR ART IN THAT A COMPLEX OF TWO POLYMERIC MATERIALS ARE CONCENTRATED IN THE EMERGENT LIQUID PHASE. THE CAPSULE WALLS ARE SOLIDIFIED BY REACTING THE SILCEOUS CAPSULE WALL MATERIAL WITH AN INORGANIC SALT, VIZ, ALUMINUM SULFATE, CALCIUM CHLORIDE, MAGNESIUM SULFATE, IRON CHLORIDE OR MAGNESIUM BROMIDE.
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