| 摘要 |
A novel pressure sensitive record material suitable for use for high temperature reprographic equipment is disclosed comprising a sheet support carrying isolated droplets of an oil solution of chromogenic material, said isolated droplets being confined within respective pressure rupturable barriers, and, on the opposite surface of the same sheet or on a different sheet support, a coating of a acidic developer material effective to develop the color of the chromogenic material in solution on contact, wherein, the pressure rupturable barrier comprises microcapsules having a wall material formed from polymerization of melamine and formaldehyde, methylol melamine methylated methylol melamine, urea and formaldehyde, dimethylol urea or methylated dimethylol urea, with a copolymer of acrylic acid and alkyl acrylate; the oil solution comprises a blend of (i) a vegetable oil having a degree of unsaturation greater than 30% such as canol a oil, soybean oil, corn oil, sunflower oil, or cottonseed oil with (ii) alkyl este rs of fatty acids derived from transesterification of the same or different vegetable oils suc h as a canola oil, soybean oil, corn oil, sunflower oil, or methyl ester of oleic acid, an d (iii) straight chain saturated paraffinic aliphatic hydrocarbons of from 10 to 13 carbons. The disclosed pressure sensitive record material is suitable for use in high temperature reprographic environments.
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