GB811131A - Improvements in or relating to method of preparing new carboxylic acid and the new carboxylic acid resulting from said method - Google Patents

Abstract

A polycarboxylic acid is made by condensing an aliphatic coupling agent and a bis-(hydroxy-aryl)-substituted aliphatic acid, said aliphatic coupling agent being an epihalohydrin, an aliphatic dihalide, an aliphatic dihaloether or an aliphatic polyepoxide. Specified coupling agents are 1,2 - dichloroethane, 1,3 - dichloro-propane, 1,4 - dichlorobutane, 1,4 - dichloro-butene, glycol dichlorohydrin, bis-(2-chloro-ethyl) ether, epichlorohydrin, epibromohydrin, 2,3 - epoxypropyl - 2 - hydroxy - 3 - chloropropyl ether, 1,2 - epoxy - 3,4 - epoxybutane and bis-(2,3-epoxypropyl) ether. In the examples, 4,4 - bis - (4 - hydroxy - phenyl) - pentanoic acid is condensed in aqueous caustic soda with: (I) 1,4 - dichlorobutene - 2; (II) 1,4 - dichloro-butane; (III) and (IV) bis-(2-chloroethyl)ether; (V) and (VI) bis-(4-hydroxy-phenyl)-isopropylidene and bis-(2-chloroethyl) ether and (VII) to (X) inclusive epichlorohydrin. The resultant resinous polycarboxylic acids may be esterified with alcoholic hydroxyl groups or epoxide groups and may be used as coatings. The acids may be condensed with polyhydric phenol/epichlorohydrin reaction products and epoxidised vegetable oils. Example (XI) describes the reaction of the product of Example (I) with an epoxidised soya bean oil to form a film. Specifications 768,206 and 790,373 are referred to.ALSO:A polycarboxylic acid is made by condensing an aliphatic coupling agent and a bis (hydroxy aryl) substituted aliphatic acid, said aliphatic coupling agent being an epihalohydrin, an aliphatic dihalide, an aliphatic dihaloether, or an aliphatic poly epoxide. Specified coupling agents are 1,2-dichloro ethane, 1,3-dichloropropane, 1,4 - dichlorobutane, 1,4 - dichlorobutene, glycol dichlorohydrin, bis - (2 - chloroethyl) ether, epichlorohydrin, epibromohydrin, 2,3 - epoxy propyl 2 - hydroxy - 3 - chloropropyl ether, 1,2 - epoxy - 3,4 - epoxybutane, and bis - (2,3 - epoxypropyl) ether. In the examples, 4,4-bis-(4-hydroxy-phenyl) pentanoic acid is condensed in aqueous caustic soda with: (I) 1,4-dichlorobutene-2, (II) 1,4-dichlorobutane, (III) and (IV) bis-(2-chloroethyl) ether, (V) and (VI) bis-(4-hydroxy phenyl) isopropylidene and bis-(2-chloroethyl) ether and (VII) to (X) inclusive epichlorohydrin. Specifications 768,206 and 790,373 are referred to.