| 摘要 |
polyester outer layer (A layer) having 0.005-0.015 micrometer of intensity of illumination comprising the inorg. cpd. selected from calcium carbonate, dolomite, glassfair, fiber glass, asbesto talc, kaotin mica, peldspa, silica, barium sulphate, silicon carbide, molibdenium sulphide, zinc sulphide, aluminium silicate, zirconium silicate, barium titanate, aluminium trihydrate, or titanium dioxide; other outer polyester layer (B layer) having 0.2-0.04 micrometer of intensity of illumination comprising the claimed inorg. cpd.; and at least one polyester layer (C layer) contg. carbon black between A and B layers. The obtd. film has less than 30% of light transparency.
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