| 摘要 |
1,197,406. Cellulose fibrous compositions. NATIONAL CASH REGISTER CO. 11 June, 1968 [17 July, 1967], No. 27635/68. Headings C3N and C3U. [Also in Divisions B2, D1 and D2] A liquid dispersion in which minute polymer capsules are bound together with cellulose fibres is prepared by dispersing by agitation the capsules and the fibres in a solution of a film-forming polymeric material, effecting liquidliquid phase separation of the solution and continuing the agitation of the solution to disperse the emergent, polymer-rich liquid phase the droplets of which effect the binding of the capsules and cellulose fibres. The cellulose fibres are preferably dry ball-milled fibres of from 20 to 200 microns in diameter. In an example the capsules have walls of a 1 : 1 complex of gelatine and gum arabic and contain chlorinated oil. Synthetic fibres of synthetic resinous material, e.g. polyacrylic, polyester, polyamide may also be present. The film-forming polymeric solution may have one electric charge, e.g. polyethylenimine starch and the tertiary amine of corn starch in which case phase separation is effected by the addition of a reagent having an opposite electric charge, e.g. polyvinyl methyl ether maleic anhydride, karaya gum, gyar gum, locust bean gum and polyacrylamide. The dispersion may be pressed into blocks in which an intimate mixture of capsules and fibres are present in juxaposition. |
