Non-baked color pencil leads and method for preparing same
申请人:MITSUBISHI PENCIL KABUSHIKI KAISHA
公开号:EP0573000A2
公开(公告)日:1993-12-08
Novel non-baked color pencil leads are here disclosed which can be obtained by forming a blend composition from a filler, a pigment, a binder and the like without using any wax, at least one of the pigment and the filler being all or partially covered with a fluorinated aromatic compound, kneading the blend composition with a solvent and/or a plasticizer, extruding the kneaded material, drying the extruded articles to remove the solvent and/or the plasticizer therefrom, and then impregnating the porous articles with an oil, a fat and/or a wax. Color pencil leads which can be erased with an eraser or color pencil leads which cannot be erased with an eraser can be selectively prepared.
Anthracene, phenanthrene, decafluorophenanthrene, pyrene, biphenyl and decafluorobiphenyl have been fluorinated over potassiumtetrafluorocobaltate(III) and some of them over caesium tetrafluorocobaltate(III). All the product mixtures except those from pyrene and decafluorobiphenyl consisted mainly of perfluoro-olefins and -aromatics; the pyrene product was largely a perfluoroper-hydropyrene, and that