NEW DICHLOROPHTHALIDE AND ITS PRODUCTION, AND PRODUCTION OF 2-FORMYLBENZOIC ACID NUCLEUS CHLORINATION PRODUCTS USING THE SAME

    公开(公告)号:JPH11246542A

    公开(公告)日:1999-09-14

    申请号:JP5207098

    申请日:1998-03-04

    摘要: PROBLEM TO BE SOLVED: To provide new dichlorophthalides, especially 3,5-dischlorophthalide and 3,6-dichlorophthalide, that can profitably produce compounds useful in various kinds of fields, to provide a method for producing the dichlorophthalides, and to provide a method for producing a 2-formylbenzoic acid nucleus- chlorination product from the mixture, capable of profitably producing 4- chloro-2-formylbenzoic acid (4-COFBA) and 5-chloro-2-formylbenzoic acid (5- COFBA) using a mixture of them. SOLUTION: This method for producing dichlorophthalides comprises hydrolyzing 1-trichloromethyl-2-dichloromethylbenzene mononucleus chlorination product mixture in the presence of a Lewis acid catalyst and subsequently distilling the obtained reaction product to obtain the purified mixture of 3,5- dichlorophthalide with 3,6-dichlorophthalide. This method for producing a 2- formylbenzoic acid nucleus chlorinated product comprises hydrolyzing the mixture and subsequently crystallizing the hydrolysis product to separate 4-chloro-2- formylbenzoic acid and 5-chloro-2-formylbenzoic acid.

    HEAT SENSITIVE RECORDING MATERIAL AND CARBOXYLIC ACID POLYVALENT METALLIC SALT

    公开(公告)号:JPH0752537A

    公开(公告)日:1995-02-28

    申请号:JP20054893

    申请日:1993-08-12

    摘要: PURPOSE:To improve preservation stability of a color undeveloped part and a color developed image by incorporating at least one type of specific naphthalenecarboxylic acid derivative or/and polyvalent metallic salt of the derivative in a heat sensitive recording material containing electron donative color developing compound and electron accepting compound. CONSTITUTION:A heat sensitive recording material contains electron donative color developing compound and electron accepting compound to be used in fields of a facsimile, a recorder and a printer, and comprises at least one type of naphthalenecarboxylic acid derivative or/and polyvalent metallic salt of the derivative. As the salt of such a naphthalenecarboxylic acid derivative, hard water soluble or water insoluble bivalent, trivalent or tetravalent metallic salt, preferably bivalent or trivalent metallic salt is included, or preferably zinc salt or calcium salt is included. Thus, preservation stabilities (moist heat resistance, oil resistance, writing instrument resistance) of a color undeveloped part and a color developed image are enhanced.