Discoloration time monitor layer |
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| 申请号 | JP11354786 | 申请日 | 1986-05-20 | 公开(公告)号 | JPS62174289A | 公开(公告)日 | 1987-07-31 |
| 申请人 | Mitsui Toatsu Chem Inc; | 发明人 | TSUTSUMI HARUKI; YAMAGUCHI TAKAMINE; HIRAYAMA NOBUHIRO; AKAHORI HIROYUKI; ASANO MAKOTO; | ||||
| 摘要 | PURPOSE: To provide a discoloration time monitor layer capable of readily regulating the time required for a discoloring agent in the form of microcapsules to undergo discoloration, by drying an emulsion of a polymer comprising styrene and/or acrylonitrile monomeric units as its structural units so as to form a film. CONSTITUTION: A desired discoloration time monitor layer is produced by drying an emulsion of a polymer comprising styrene and/or acrylonitrile monomeric units as it structural units so as to form a film. Placing this layer between layer A contg. microcapsules of a oily material and layer B contg. a material which causes discoloration upon contact with the oily material enables control of the time required for the oily material which has flowed out upon breakage of the microcapsules to reach the layer B to thereby cause discoloration. When the polymer constituting the monitor layer has a high styrene monomeric unit content, the time for causing discoloration is short. On the other hand, when the polymer has a high acrylonitrile monomeric unit content, the time is long. COPYRIGHT: (C)1987,JPO&Japio |
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