| 摘要 |
1,141,186. Double-walled microcapsules. NATIONAL CASH REGISTER CO. 18 Aug., 1967 [23 Nov., 1966], No. 38067/67. Heading B8C. [Also in Division C1] Double-walled capsules are produced by dispersing particles or droplets comprising core material in an aqueous vehicle, the disperse and continuous phases each containing one of a pair of reactants which react together at the interfaces of the two phases to form a continuous protective polymeric coating around the droplets or particles, and subsequently encapsulating the coated discrete particles or droplets in a coacervate of hydrophilic polymeric material either whilst still present in the reaction system or in a separate system. Examples relate to the encapsulation of toluene diisocyanate, sodium fluoroescein and sodium dichromate which are coated in a silicone polymer produced by reaction of monosodium trimethyl silanolate (in the continuous phase) with a liquid silicone polymer or monomer dissolved in or coated upon the core material and then with a gelatine/gum arabic coacervate. |
