发明名称 |
Process for producing a polyvinyl acetacetal resin |
摘要 |
A heat transfer sheet comprises a substrate sheet and a heat transfer layer laminated on the substrate sheet and containing a dye which can be caused to migrate by heating to be transferred onto a transferable sheet, said heat transfer sheet containing a polyvinyl acetacetal resin as a binder component, the acetal moiety of said polyvinyl acetacetal resin being 50% by weight or more based on the total amount of the resin, and 80% by weight or more of said acetal moiety comprising polyvinyl acetacetal. A process for producing a polyvinyl acetacetal resin by the reaction of a polyvinyl alcohol and acetaldehyde in an aqueous phase in the presence of 4 to 10% by weight of an acid catalyst comprises initiating precipitation of an acetalated product by maintaining the reaction system at a temperature of 8 to 17 DEG C for 30 minutes or longer, and then maintaining said reaction at a temperature of 25 to 40 DEG C. |
申请公布号 |
EP0513857(B1) |
申请公布日期 |
1996.05.01 |
申请号 |
EP19920112685 |
申请日期 |
1987.12.14 |
申请人 |
DAI NIPPON INSATSU KABUSHIKI KAISHA;SEKISUI KAGAKU KOGYO KABUSHIKI KAISHA |
发明人 |
KANTO, JUMPEI;AKADA, MASANORI;KAMAKARI, KATSUHIRO;ASAHINA, KENICHI;SAKASHITA, KATSUAKI;WATANABE, YOSHIHISA |
分类号 |
B41M5/035;B41M5/26;B41M5/395;C08F8/00;C08F8/28;C08F218/04 |
主分类号 |
B41M5/035 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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