| 摘要 |
868,158. Photographic film base materials. MONTECATINI SOC. GENERALE PER L'INDUSTRIA MINERARIA E CHIMICA. Jan. 5, 1959 [Jan. 10, 1958], No. 369/59. Addition to 854,649. Class 140. [Also in Group XX] A photographic film base material comprises a resinous sheet material, e.g. oriented and stabilized crystalline polypropylene coated with an amorphous low molecular weight polypropylene mixed with a further polymeric substance which is polystyrene, a styrene-maleic anhydride copolymer, a polyamide or a polyalkyleneimine which is miscible therewith and/or treated with a sulphonating, chlorinating or sulphochlorinating agent. The polypropylene after treatment with the sulphonating, chlorinating or sulphochlorinating agent, e.g. concentrated sulphuric acid, oleum, phospho- and chlorosulphonic acid, phosphosulphuric acid, sulphuryl chloride, gaseous chlorine or phosphorous pentachloride, may be treated with an aminating agent which is an amine or diamine, preferably a lower aliphatic amine containing not more than eight carbon atoms, e.g. isobutylamine, mono- and diethanolamine. A solution of amorphous polypropylene may be prepared, e.g. in chloroform, dichloroethane or trichloroethylene, and the further polymeric substance or sulphonating, chlorinating or sulphochlorinating agent added thereto prior to coating. Alternatively, the solution of the amorphous polypropylene and further polymeric substance may be coated on to the resinous sheet material and subsequently treated with the agent. The solution may contain from 0.1 to 25% by weight polypropylene and may form a coating of thickness 1.25 to 25 microns. The coated resinous sheet material may be further coated with an aqueous gelatine solution which may contain silver salts or compositions for obtaining coloured pictures. Coatings which may not contain polypropylene may also be present. Specification 868,159 is referred to. |
