| 摘要 |
<p>1,095,339. Carbon papers &c. COLUMBIA RIBBON & CARBON MANUFACTURING CO. Inc. July 28, 1965 [July 30, 1964], No. 32188/65. Heading D2B. [Also in Division C3] Pressure-sensitive transfer sheets are made by dissolving in a volatile organic solvent at least two different plastics materials that do not form a solid solution with one another in the proportions used, applying the solution to a flexible foundation and evaporating the solvent. In the Examples, the compositions comprise: (Example 1) polystyrene, ethylcellulose, magnetic iron oxide and toluene; (Example 2) polystyrene, ethylcellulose, clay, Milori blue and toluene; (Example 3) polyterpene resin, methacrylate polymer, hectograph black dye and toluene; (Example 4) polystyrene, methacrylate polymer, magnetic iron oxide and toluene; (Example 5) polystyrene, ethylcellulose, isobutylene polymer, lanolin, Milori blue, clay, toluene and methyl isobutyl ketone; and (Example 6) polystyrene, ethyl-hydroxyethyl-cellulose, chlorinated polyphenyl resin, refined rapeseed oil, sulphonated vegetable oil, logwood black, indulin oleate and ethyl acetate. Many other plastics materials are referred to. When pigments, fillers, dyestuffs or oils are incorporated, this is preferably by slurrying them in a small amount of the solvent, and then adding this to the solution. When they are absent, the frangibility of the coating may be enhanced by an under-coating or overcoating, e.g. of wax, or a receptor layer, e.g. of butadiene-styrene polymer, poly-isobutene or acrylic resins containing fillers such as clay.</p> |
