Pyrroline or indoline-containing phthalide
专利汇可以提供Pyrroline or indoline-containing phthalide专利检索，专利查询，专利分析的服务。并且PURPOSE: To enhance lightfastness of a pressure-sensitive or thermal recording material by adding a substrate containing phthalides or coated with phthalides as a coloring agent.
CONSTITUTION: A solution produced by dissolving phthalides shown by formula II into a mixture at diisopropyl naphthalene and kerosene is microcapsuled using gelatin and gum arabic. The microcapsules are mixed with the solution and applied onto a paper sheet and active clay is applied, as a developer, onto the surface of a second paper sheet. The first sheet containing a coloring agent and the second sheet coated with the developer are then superposed while abutting the coated faces. When pressure is applied onto the first sheet by handwriting or typewriter, coloring takes place on the second sheet coated with the developer to produce an intensive yellow copy excellent in lightfastness.
COPYRIGHT: (C)1992,JPO，下面是Pyrroline or indoline-containing phthalide专利的具体信息内容。
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