| 摘要 |
905,549. Coated polycarbonate foils. AGFA A.G. Sept. 28, 1960 [Oct. 1, 1959], No. 33335/60. Class 140. Coated foils of linear polycarbonates of molecular weight of at least 15,000 are produced by coating the foil with a layer comprising cellulose esters in the presence of isocyanate-modified polyhydroxy compounds as anchoring agents, the said isocyanate modified polyhydroxy compounds having a molecular weight of at least 20,000 and soluble in organic solvents. The isocyanate modified polyhydroxy compound may be added to the cellulose ester solution used for the coating. The anchoring agent may be used as an intermediate layer between the polycarbonate foil and the layer of cellulose ester. The cellulose ester may be cellulose acetate, acetobutyrate, or nitrate. The intermediate layer may contain in addition 5 to 25 parts by weight per 100 parts by weight of the isocyanate-modified polyhydroxy compound, of hexamethylene diisocyanate, 1-methyl-benzene-2,6-diisocyanate, 1- methyl - benzene - 2,4 - diisocyanate, naphthalene - 1,5 - diisocyanate, triphenyl methane 4,4<SP>1</SP>-4<SP>11</SP>-diisocyanate or diphenyl-methane-4,41- diisocyanate. The second layer may comprise 10 to 120 parts by weight of the isocyanatemodified polyhydroxy compound and 100 parts by weight of cellulose acetate, acetobutyrate or nitrate. Examples of isocyanate-modified polyhydroxy compounds are given. Specifications 787,592, 800,815, 808,629, 820,865, 834,101 and 891,654 are referred to. |
