| 摘要 |
1,232,482. Squeeze-out "carbon" papers. COLUMBIA RIBBON & CARBON MFG. CO. Inc. 16 Sept., 1968 [25 Sept., 1967], No. 43902/68. Heading D2B. A squeeze-out "carbon" paper has over the ink layer a thin porous non-transferable layer formed by applying a particulate layer of thermoplastic material and heating to fuse the particles to one another and to the ink layer, but not enough to destroy the porosity. Preferably the particles are applied as a dispersion in a non-solvent liquid, which is then evaporated off, but they may be applied as a dry powder by brushing them on or by the attraction of a static charge. In the example, a film of polyethylene terephthalate is first coated with a layer of polyvinylidene chloride in methyl ethyl ketone, then with a composition comprising vinyl chloride-acetate copolymer, mineral oil, refined rapeseed oil, sulphonated vegetable oil, blue toning paste, black toner pigment, ethyl acetate and toluol. After drying, a dispersion of polyvinyl chloride in xylene is applied, and heated to 350‹F to soften the particles. Reference is also made to the use as pigments of carbon blacks, magnetic iron oxides and colour-reactive chemicals, and for the top layer to rubber latices, copal, colophony, polyethylene, polypropylene, polycarbonates, cellulose acetate and ethylcellulose, and as dispersion media to water, toluene, naphtha, butanol, propanol and ethylene glycol. Plasticizers fillers and colorants may also be present in the supercoating. A selfsupporting ink-releasing microporous layer formed on and stripped from a casting surface may be coated on both sides. |
