| 摘要 |
901,252. Coated films. MONTECATINI SOC. GENERALE PER L'INDUSTRIA MINERARIA E CHIMICA. April 10, 1959 [April 15, 1958], No. 12211/59. Class 140. A coated film is produced by applying to at least one surface of the film a solution of an amorphous or partially crystalline polypropylene having an intrinsic viscosity below 1 and subsequently evaporating the solvent. The polypropylene may be obtained by solvent extraction using aliphatic hydrocarbons, e.g. pentane, hexane, heptane, chlorinated aliphatic hydrocarbons, e.g. chloroform, trichloroethylene, perchloroethylene and carbon tetrachloride, and diethyl ether, of the crude polymer obtained by polymerization in the presence of a stereospecific catalyst. The polypropylene may be further extracted with acetone, the residue being employed. The polypropylene may be chlorinated, e.g. by dissolving the polypropylene in carbon tetrachloride, subjecting the solution to the action of gaseous chlorine, removing excess chlorine and filtering the solution, and may have a chlorine content of from 10 to 50%. The chlorinated polypropylene may be applied as a solution in chloroform, trichloroethylene, perchloroethylene, toluene, or a mixture of two or more thereof, having a concentration of not less than 10% by weight. The film may be a polyester film, e.g. polyethylene terephthalate, regenerated cellulose, or a vinyl copolymer film, e.g. a vinyl chloridevinyl acetate film. Specifications 854,649 and 868,158 are referred to. |
